Ultra-low-power 32-bit MCU ARM®-based

Ultra-low-power 32-bit MCU ARM®-based
STM32L082KB STM32L082KZ
STM32L082CZ
Ultra-low-power 32-bit MCU ARM®-based Cortex®-M0+, up to 192KB
Flash, 20KB SRAM, 6KB EEPROM, USB, ADC, DACs, AES
Datasheet - production data
Features
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Ultra-low-power platform
– 1.65 V to 3.6 V power supply
– -40 to 125 °C temperature range
– 0.29 µA Standby mode (3 wakeup pins)
– 0.43 µA Stop mode (16 wakeup lines)
– 0.86 µA Stop mode + RTC + 20 KB RAM
retention
– Down to 93 µA/MHz in Run mode
– 5 µs wakeup time (from Flash memory)
– 41 µA 12-bit ADC conversion at 10 ksps
Core: ARM® 32-bit Cortex®-M0+ with MPU
– From 32 kHz up to 32 MHz max.
– 0.95 DMIPS/MHz
Reset and supply management
– Ultra-safe, low-power BOR (brownout reset)
with 5 selectable thresholds
– Ultra-low-power POR/PDR
– Programmable voltage detector (PVD)
Clock sources
– 1 to 25 MHz crystal oscillator
– 32 kHz oscillator for RTC with calibration
– High speed internal 16 MHz factory-trimmed RC
(+/- 1%)
– Internal low-power 37 kHz RC
– Internal multispeed low-power 65 kHz to
4.2 MHz RC
– Internal self calibration of 48 MHz RC for USB
– PLL for CPU clock
Pre-programmed bootloader
– USB, USART supported
Development support
– Serial wire debug supported
Up to 40 fast I/Os (34 I/Os 5V tolerant)
Memories
– Up to 192 KB Flash memory with ECC (2 banks
with read-while-write capability)
– 20KB RAM
– 6 KB of data EEPROM with ECC
– 20-byte backup register
– Sector protection against R/W operation
May 2016
This is information on a product in full production.
UFQFPN32
(5x5 mm)
LQFP32
(7x7 mm)
WLCSP49
(3.294x3.258 mm)
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Rich Analog peripherals
– 12-bit ADC 1.14 Msps, up to 13 channels (down
to 1.65 V)
– 2 x 12-bit channel DACs with output buffers
(down to 1.8 V)
– 2x ultra-low-power comparators (window mode
and wake up capability, down to 1.65 V)
Up to 19 capacitive sensing channels supporting
touchkey, linear and rotary touch sensors
7-channel DMA controller, supporting ADC, SPI,
I2C, USART, DAC, Timers, AES
11x peripheral communication interfaces
– 1x USB 2.0 crystal-less, battery charging
detection and LPM
– 4x USART (2 with ISO 7816, IrDA), 1x UART
(low power)
– Up to 6x SPI 16 Mbits/s
– 3x I2C (2 with SMBus/PMBus)
11x timers: 2x 16-bit with up to 4 channels, 2x 16-bit
with up to 2 channels, 1x 16-bit ultra-low-power
timer, 1x SysTick, 1x RTC, 2x 16-bit basic for DAC,
and 2x watchdogs (independent/window)
CRC calculation unit, 96-bit unique ID
True RNG and firewall protection
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Hardware Encryption Engine AES 128-bit
All packages are ECOPACK®2
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Contents
STM32L082xx
Contents
1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
2.1
Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.2
Ultra-low-power device continuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1
Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2
Interconnect matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.3
ARM® Cortex®-M0+ core with MPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.4
Reset and supply management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.4.1
Power supply schemes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.4.2
Power supply supervisor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.4.3
Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.5
Clock management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.6
Low-power real-time clock and backup registers . . . . . . . . . . . . . . . . . . . 25
3.7
General-purpose inputs/outputs (GPIOs) . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.8
Memories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.9
Boot modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.10
Direct memory access (DMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.11
Analog-to-digital converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.12
Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.12.1
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Internal voltage reference (VREFINT) . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.13
Digital-to-analog converter (DAC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.14
Ultra-low-power comparators and reference voltage . . . . . . . . . . . . . . . . 29
3.15
Touch sensing controller (TSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.16
AES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.17
Timers and watchdogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.17.1
General-purpose timers (TIM2, TIM3, TIM21 and TIM22) . . . . . . . . . . . 31
3.17.2
Low-power Timer (LPTIM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.17.3
Basic timer (TIM6, TIM7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.17.4
SysTick timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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3.18
Contents
3.17.5
Independent watchdog (IWDG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.17.6
Window watchdog (WWDG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Communication interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.18.1
I2C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.18.2
Universal synchronous/asynchronous receiver transmitter (USART) . . 34
3.18.3
Low-power universal asynchronous receiver transmitter (LPUART) . . . 34
3.18.4
Serial peripheral interface (SPI)/Inter-integrated sound (I2S) . . . . . . . . 35
3.18.5
Universal serial bus (USB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.19
Clock recovery system (CRS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.20
Cyclic redundancy check (CRC) calculation unit . . . . . . . . . . . . . . . . . . . 36
3.21
Serial wire debug port (SW-DP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4
Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5
Memory mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.1
Parameter conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.1.1
Minimum and maximum values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.1.2
Typical values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.1.3
Typical curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.1.4
Loading capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.1.5
Pin input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.1.6
Power supply scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.1.7
Current consumption measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.2
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.3
Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.3.1
General operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.3.2
Embedded reset and power control block characteristics . . . . . . . . . . . 54
6.3.3
Embedded internal reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.3.4
Supply current characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
6.3.5
Wakeup time from low-power mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.3.6
External clock source characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
6.3.7
Internal clock source characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
6.3.8
PLL characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
6.3.9
Memory characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
6.3.10
EMC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
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STM32L082xx
6.3.11
Electrical sensitivity characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
6.3.12
I/O current injection characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
6.3.13
I/O port characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
6.3.14
NRST pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
6.3.15
12-bit ADC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
6.3.16
DAC electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
6.3.17
Temperature sensor characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
6.3.18
Comparators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
6.3.19
Timer characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
6.3.20
Communications interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
7.1
WLCSP49 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
7.2
LQFP32 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
7.3
UFQFPN32 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113
7.4
Thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
7.4.1
Reference document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
8
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
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List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
Table 17.
Table 18.
Table 19.
Table 20.
Table 21.
Table 22.
Table 23.
Table 24.
Table 25.
Table 26.
Table 27.
Table 28.
Table 29.
Table 30.
Table 31.
Table 32.
Table 33.
Table 34.
Table 35.
Table 36.
Table 37.
Table 38.
Table 39.
Table 40.
Table 41.
Table 42.
Table 43.
Table 44.
Ultra-low-power STM32L082xx device features and peripheral counts . . . . . . . . . . . . . . . 11
Functionalities depending on the operating power supply range . . . . . . . . . . . . . . . . . . . . 16
CPU frequency range depending on dynamic voltage scaling . . . . . . . . . . . . . . . . . . . . . . 16
Functionalities depending on the working mode
(from Run/active down to standby) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
STM32L0xx peripherals interconnect matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Temperature sensor calibration values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Internal voltage reference measured values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Capacitive sensing GPIOs available on STM32L082xx devices . . . . . . . . . . . . . . . . . . . . 30
Timer feature comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Comparison of I2C analog and digital filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
STM32L082xx I2C implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
USART implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
SPI/I2S implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Legend/abbreviations used in the pinout table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
STM32L072xxx pin definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Alternate functions port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Alternate functions port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Alternate functions port C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Alternate functions port H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Voltage characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Current characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
General operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Embedded reset and power control block characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . 54
Embedded internal reference voltage calibration values . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Embedded internal reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Current consumption in Run mode, code with data processing running from 
Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Current consumption in Run mode vs code type, 
code with data processing running from Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Current consumption in Run mode, code with data processing running from RAM . . . . . . 59
Current consumption in Run mode vs code type, 
code with data processing running from RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Current consumption in Sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Current consumption in Low-power run mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Current consumption in Low-power sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Typical and maximum current consumptions in Stop mode . . . . . . . . . . . . . . . . . . . . . . . . 64
Typical and maximum current consumptions in Standby mode . . . . . . . . . . . . . . . . . . . . . 65
Average current consumption during Wakeup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Peripheral current consumption in Run or Sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Peripheral current consumption in Stop and Standby mode . . . . . . . . . . . . . . . . . . . . . . . 69
Low-power mode wakeup timings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
High-speed external user clock characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Low-speed external user clock characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
HSE oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
LSE oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
16 MHz HSI16 oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
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List of tables
Table 45.
Table 46.
Table 47.
Table 48.
Table 49.
Table 50.
Table 51.
Table 52.
Table 53.
Table 54.
Table 55.
Table 56.
Table 57.
Table 58.
Table 59.
Table 60.
Table 61.
Table 62.
Table 63.
Table 64.
Table 65.
Table 66.
Table 67.
Table 68.
Table 69.
Table 70.
Table 71.
Table 72.
Table 73.
Table 74.
Table 75.
Table 76.
Table 77.
Table 78.
Table 79.
Table 80.
Table 81.
Table 82.
Table 83.
Table 84.
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HSI48 oscillator characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
LSI oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
MSI oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
PLL characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
RAM and hardware registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Flash memory and data EEPROM characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Flash memory and data EEPROM endurance and retention . . . . . . . . . . . . . . . . . . . . . . . 79
EMS characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
EMI characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
ESD absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Electrical sensitivities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
I/O current injection susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
I/O static characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Output voltage characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
I/O AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
NRST pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
ADC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
RAIN max for fADC = 16 MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
ADC accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
DAC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Temperature sensor calibration values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Temperature sensor characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Comparator 1 characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Comparator 2 characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
TIMx characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
I2C analog filter characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
USART/LPUART characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
SPI characteristics in voltage Range 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
SPI characteristics in voltage Range 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
SPI characteristics in voltage Range 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
USB startup time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
USB DC electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
USB: full speed electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
WLCSP49 - 49-pin, 3.294 x 3.258 mm, 0.4 mm pitch wafer level chip scale 
package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
WLCSP49 recommended PCB design rules (0.4 mm pitch) . . . . . . . . . . . . . . . . . . . . . . 110
LQFP32 - 32-pin, 7 x 7 mm low-profile quad flat package mechanical data. . . . . . . . . . . 112
UFQFPN32 - 32-pin, 5x5 mm, 0.5 mm pitch ultra thin fine pitch quad flat 
package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
STM32L082xx ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
DocID027099 Rev 4
STM32L082xx
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
Figure 37.
Figure 38.
Figure 39.
STM32L082xx block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Clock tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
STM32L082xx WLCSP49 ballout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
STM32L082xx LQFP32 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
STM32L082xx UFQFPN32 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Memory map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Pin loading conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Pin input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Power supply scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Current consumption measurement scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
IDD vs VDD, at TA= 25/55/85/105 °C, Run mode, code running from 
Flash memory, Range 2, HSE, 1WS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
IDD vs VDD, at TA= 25/55/85/105 °C, Run mode, code running from 
Flash memory, Range 2, HSI16, 1WS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
IDD vs VDD, at TA= 25 °C, Low-power run mode, code running
from RAM, Range 3, MSI (Range 0) at 64 KHz, 0 WS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
IDD vs VDD, at TA= 25/55/ 85/105/125 °C, Stop mode with RTC enabled 
and running on LSE Low drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
IDD vs VDD, at TA= 25/55/85/105/125 °C, Stop mode with RTC disabled, 
all clocks off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
High-speed external clock source AC timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Low-speed external clock source AC timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
HSE oscillator circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Typical application with a 32.768 kHz crystal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
HSI16 minimum and maximum value versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . 75
VIH/VIL versus VDD (CMOS I/Os) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
VIH/VIL versus VDD (TTL I/Os) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
I/O AC characteristics definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Recommended NRST pin protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
ADC accuracy characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Typical connection diagram using the ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Power supply and reference decoupling (VREF+ not connected to VDDA). . . . . . . . . . . . . . 93
Power supply and reference decoupling (VREF+ connected to VDDA). . . . . . . . . . . . . . . . . 94
12-bit buffered/non-buffered DAC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
SPI timing diagram - slave mode and CPHA = 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
SPI timing diagram - slave mode and CPHA = 1(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
SPI timing diagram - master mode(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
USB timings: definition of data signal rise and fall time . . . . . . . . . . . . . . . . . . . . . . . . . . 106
WLCSP49 - 49-pin, 3.294 x 3.258 mm, 0.4 mm pitch wafer level chip scale 
package outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
WLCSP49 - 49-pin, 3.294 x 3.258 mm, 0.4 mm pitch wafer level chip scale 
recommended footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
LQFP32 - 32-pin, 7 x 7 mm low-profile quad flat package outline . . . . . . . . . . . . . . . . . . 111
LQFP32 - 32-pin, 7 x 7 mm low-profile quad flat recommended footprint . . . . . . . . . . . . 112
UFQFPN32 - 32-pin, 5x5 mm, 0.5 mm pitch ultra thin fine pitch quad flat 
package outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
UFQFPN32 - 32-pin, 5x5 mm, 0.5 mm pitch ultra thin fine pitch quad flat 
recommended footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
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8
List of figures
Figure 40.
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STM32L082xx
Thermal resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
DocID027099 Rev 4
STM32L082xx
1
Introduction
Introduction
The ultra-low-power STM32L082xx are offered in 32- and 49-pin packages. Depending on
the device chosen, different sets of peripherals are included, the description below gives an
overview of the complete range of peripherals proposed in this family.
These features make the ultra-low-power STM32L082xx microcontrollers suitable for a wide
range of applications:

Gas/water meters and industrial sensors

Healthcare and fitness equipment

Remote control and user interface

PC peripherals, gaming, GPS equipment

Alarm system, wired and wireless sensors, video intercom
This STM32L082xx datasheet should be read in conjunction with the STM32L0x2xx
reference manual (RM0376).
For information on the ARM® Cortex®-M0+ core please refer to the Cortex®-M0+ Technical
Reference Manual, available from the www.arm.com website.
Figure 1 shows the general block diagram of the device family.
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36
Description
2
STM32L082xx
Description
The ultra-low-power STM32L082xx microcontrollers incorporate the connectivity power of
the universal serial bus (USB 2.0 crystal-less) with the high-performance ARM® Cortex®M0+ 32-bit RISC core operating at a 32 MHz frequency, a memory protection unit (MPU),
high-speed embedded memories (up to 192 Kbytes of Flash program memory, 6 Kbytes of
data EEPROM and 20 Kbytes of RAM) plus an extensive range of enhanced I/Os and
peripherals.
The STM32L082xx devices provide high power efficiency for a wide range of performance.
It is achieved with a large choice of internal and external clock sources, an internal voltage
adaptation and several low-power modes.
The STM32L082xx devices offer several analog features, one 12-bit ADC with hardware
oversampling, two DACs, two ultra-low-power comparators, AES, several timers, one lowpower timer (LPTIM), four general-purpose 16-bit timers and two basic timer, one RTC and
one SysTick which can be used as timebases. They also feature two watchdogs, one
watchdog with independent clock and window capability and one window watchdog based
on bus clock.
Moreover, the STM32L082xx devices embed standard and advanced communication
interfaces: up to three I2Cs, two SPIs, one I2S, four USARTs, a low-power UART
(LPUART), and a crystal-less USB. The devices offer up to 19 capacitive sensing channels
to simply add touch sensing functionality to any application.
The STM32L082xx also include a real-time clock and a set of backup registers that remain
powered in Standby mode.
The ultra-low-power STM32L082xx devices operate from a 1.8 to 3.6 V power supply (down
to 1.65 V at power down) with BOR and from a 1.65 to 3.6 V power supply without BOR
option. They are available in the -40 to +125 °C temperature range. A comprehensive set of
power-saving modes allows the design of low-power applications.
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2.1
Description
Device overview
Table 1. Ultra-low-power STM32L082xx device features and peripheral counts
Peripheral
Flash (Kbytes)
STM32L082KB
STM32L082KZ
128 Kbytes
STM32L082CZ
192 Kbytes
Data EEPROM (Kbytes)
6 Kbytes
RAM (Kbytes)
20 Kbytes
AES
1
Timers
General-purpose
4
Basic
2
LPTIMER
1
RTC/SYSTICK/IWDG/WWDG
1/1/1/1
4(3)(1)/0
6(4)(2)/1
I2C
2
3
USART
3
4
SPI/I2S
Communication
interfaces
LPUART
1
USB/(VDD_USB)
1/(0)(3)
1/(1)
25(3)
40
0/1/1/1/1
1/1/1/1/1
1
10
1
13
GPIOs
Clocks: HSE/LSE/HSI/MSI/LSI
12-bit synchronized ADC
Number of channels
12-bit DAC
Number of channels
2
2
Comparators
2
13(3)
Capacitive sensing channels
Max. CPU frequency
Operating voltage
19
32 MHz
1.8 V to 3.6 V (down to 1.65 V at power-down) with BOR option
1.65 to 3.6 V without BOR option
Ambient temperature: –40 to +125 °C
Junction temperature: –40 to +130 °C
Operating temperatures
Packages
UFQFPN32, LQFP32
WLCSP49
1. 3 SPI interfaces are USARTs operating in SPI master mode.
2. 4 SPI interfaces are USARTs operating in SPI master mode.
3. UFQFP32 has 2 GPIOs and 1 capacitive sensing channel less that LQFP32.However, UFQFP32 features a VDD_USB pin
while LQPF32 does not.
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36
Description
STM32L082xx
Figure 1. STM32L082xx block diagram
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12/119
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STM32L082xx
2.2
Description
Ultra-low-power device continuum
The ultra-low-power family offers a large choice of core and features, from 8-bit proprietary
core up to ARM® Cortex®-M4, including ARM® Cortex®-M3 and ARM® Cortex®-M0+. The
STM32Lx series are the best choice to answer your needs in terms of ultra-low-power
features. The STM32 ultra-low-power series are the best solution for applications such as
gaz/water meter, keyboard/mouse or fitness and healthcare application. Several built-in
features like LCD drivers, dual-bank memory, low-power run mode, operational amplifiers,
128-bit AES, DAC, crystal-less USB and many other definitely help you building a highly
cost optimized application by reducing BOM cost. STMicroelectronics, as a reliable and
long-term manufacturer, ensures as much as possible pin-to-pin compatibility between all
STM8Lx and STM32Lx on one hand, and between all STM32Lx and STM32Fx on the other
hand. Thanks to this unprecedented scalability, your legacy application can be upgraded to
respond to the latest market feature and efficiency requirements.
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36
Functional overview
STM32L082xx
3
Functional overview
3.1
Low-power modes
The ultra-low-power STM32L082xx support dynamic voltage scaling to optimize its power
consumption in Run mode. The voltage from the internal low-drop regulator that supplies
the logic can be adjusted according to the system’s maximum operating frequency and the
external voltage supply.
There are three power consumption ranges:

Range 1 (VDD range limited to 1.71-3.6 V), with the CPU running at up to 32 MHz

Range 2 (full VDD range), with a maximum CPU frequency of 16 MHz

Range 3 (full VDD range), with a maximum CPU frequency limited to 4.2 MHz
Seven low-power modes are provided to achieve the best compromise between low-power
consumption, short startup time and available wakeup sources:

Sleep mode
In Sleep mode, only the CPU is stopped. All peripherals continue to operate and can
wake up the CPU when an interrupt/event occurs. Sleep mode power consumption at
16 MHz is about 1 mA with all peripherals off.

Low-power run mode
This mode is achieved with the multispeed internal (MSI) RC oscillator set to the lowspeed clock (max 131 kHz), execution from SRAM or Flash memory, and internal
regulator in low-power mode to minimize the regulator's operating current. In Lowpower run mode, the clock frequency and the number of enabled peripherals are both
limited.

Low-power sleep mode
This mode is achieved by entering Sleep mode with the internal voltage regulator in
low-power mode to minimize the regulator’s operating current. In Low-power sleep
mode, both the clock frequency and the number of enabled peripherals are limited; a
typical example would be to have a timer running at 32 kHz.
When wakeup is triggered by an event or an interrupt, the system reverts to the Run
mode with the regulator on.
Stop mode with RTC
The Stop mode achieves the lowest power consumption while retaining the RAM and
register contents and real time clock. All clocks in the VCORE domain are stopped, the
PLL, MSI RC, HSE crystal and HSI RC oscillators are disabled. The LSE or LSI is still
running. The voltage regulator is in the low-power mode.
Some peripherals featuring wakeup capability can enable the HSI RC during Stop
mode to detect their wakeup condition.
The device can be woken up from Stop mode by any of the EXTI line, in 3.5 µs, the
processor can serve the interrupt or resume the code. The EXTI line source can be any
GPIO. It can be the PVD output, the comparator 1 event or comparator 2 event
(if internal reference voltage is on), it can be the RTC alarm/tamper/timestamp/wakeup
events, the USB/USART/I2C/LPUART/LPTIMER wakeup events.
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STM32L082xx

Functional overview
Stop mode without RTC
The Stop mode achieves the lowest power consumption while retaining the RAM and
register contents. All clocks are stopped, the PLL, MSI RC, HSI and LSI RC, HSE and
LSE crystal oscillators are disabled.
Some peripherals featuring wakeup capability can enable the HSI RC during Stop
mode to detect their wakeup condition.
The voltage regulator is in the low-power mode. The device can be woken up from Stop
mode by any of the EXTI line, in 3.5 µs, the processor can serve the interrupt or
resume the code. The EXTI line source can be any GPIO. It can be the PVD output, the
comparator 1 event or comparator 2 event (if internal reference voltage is on). It can
also be wakened by the USB/USART/I2C/LPUART/LPTIMER wakeup events.

Standby mode with RTC
The Standby mode is used to achieve the lowest power consumption and real time
clock. The internal voltage regulator is switched off so that the entire VCORE domain is
powered off. The PLL, MSI RC, HSE crystal and HSI RC oscillators are also switched
off. The LSE or LSI is still running. After entering Standby mode, the RAM and register
contents are lost except for registers in the Standby circuitry (wakeup logic, IWDG,
RTC, LSI, LSE Crystal 32 KHz oscillator, RCC_CSR register).
The device exits Standby mode in 60 µs when an external reset (NRST pin), an IWDG
reset, a rising edge on one of the three WKUP pins, RTC alarm (Alarm A or Alarm B),
RTC tamper event, RTC timestamp event or RTC Wakeup event occurs.

Standby mode without RTC
The Standby mode is used to achieve the lowest power consumption. The internal
voltage regulator is switched off so that the entire VCORE domain is powered off. The
PLL, MSI RC, HSI and LSI RC, HSE and LSE crystal oscillators are also switched off.
After entering Standby mode, the RAM and register contents are lost except for
registers in the Standby circuitry (wakeup logic, IWDG, RTC, LSI, LSE Crystal 32 KHz
oscillator, RCC_CSR register).
The device exits Standby mode in 60 µs when an external reset (NRST pin) or a rising
edge on one of the three WKUP pin occurs.
Note:
The RTC, the IWDG, and the corresponding clock sources are not stopped automatically by
entering Stop or Standby mode.
DocID027099 Rev 4
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36
Functional overview
STM32L082xx
Table 2. Functionalities depending on the operating power supply range
Functionalities depending on the operating power supply range
Operating power
supply range
DAC and ADC
operation
Dynamic
voltage scaling
range
I/O operation
USB
VDD = 1.65 to 1.71 V
ADC only,
conversion time
up to 570 ksps
Range 2 or
range 3
Degraded speed
performance
Not functional
VDD = 1.71 to 1.8 V(1)
ADC only,
Range 1, range 2
conversion time
or range 3
up to 1.14 Msps
Degraded speed
performance
Functional(2)
VDD = 1.8 to 2.0 V(1)
Conversion time Range1, range 2
up to 1.14 Msps
or range 3
Degraded speed
performance
Functional(2)
VDD = 2.0 to 2.4 V
Conversion time
Range 1, range 2
up to
or range 3
1.14 Msps
Full speed operation
Functional(2)
VDD = 2.4 to 3.6 V
Conversion time
Range 1, range 2
up to
or range 3
1.14 Msps
Full speed operation
Functional(2)
1. CPU frequency changes from initial to final must respect "fcpu initial <4*fcpu final". It must also respect 5
μs delay between two changes. For example to switch from 4.2 MHz to 32 MHz, you can switch from 4.2
MHz to 16 MHz, wait 5 μs, then switch from 16 MHz to 32 MHz.
2. To be USB compliant from the I/O voltage standpoint, the minimum VDD_USB is 3.0 V.
Table 3. CPU frequency range depending on dynamic voltage scaling
16/119
CPU frequency range
Dynamic voltage scaling range
16 MHz to 32 MHz (1ws)
32 kHz to 16 MHz (0ws)
Range 1
8 MHz to 16 MHz (1ws)
32 kHz to 8 MHz (0ws)
Range 2
32 kHz to 4.2 MHz (0ws)
Range 3
DocID027099 Rev 4
STM32L082xx
Functional overview
Table 4. Functionalities depending on the working mode
(from Run/active down to standby) (1)(2)
Standby
Run/Active
Sleep
CPU
Y
--
Y
--
--
--
Flash memory
O
O
O
O
--
--
RAM
Y
Y
Y
Y
Y
--
Backup registers
Y
Y
Y
Y
Y
Y
EEPROM
O
O
O
O
--
--
Brown-out reset
(BOR)
O
O
O
O
O
DMA
O
O
O
O
--
Programmable
Voltage Detector
(PVD)
O
O
O
O
O
O
-
Power-on/down
reset (POR/PDR)
Y
Y
Y
Y
Y
Y
Y
High Speed
Internal (HSI)
O
O
--
--
(3)
--
High Speed
External (HSE)
O
O
O
O
--
--
Low Speed Internal
(LSI)
O
O
O
O
O
O
Low Speed
External (LSE)
O
O
O
O
O
O
Multi-Speed
Internal (MSI)
O
O
Y
Y
--
--
Inter-Connect
Controller
Y
Y
Y
Y
Y
--
RTC
O
O
O
O
O
O
O
RTC Tamper
O
O
O
O
O
O
O
O
Auto WakeUp
(AWU)
O
O
O
O
O
O
O
O
USB
O
O
--
--
--
O
--
O
O
(4)
O
--
O
--
IPs
USART
O
O
O
Lowpower
sleep
Stop
Lowpower
run
Wakeup
capability
O
Wakeup
capability
O
--
LPUART
O
O
O
O
O(4)
SPI
O
O
O
O
--
I2C
O
O
O
O
O(5)
ADC
O
O
--
--
--
--
DAC
O
O
O
O
O
--
DocID027099 Rev 4
O
Y
-O
--
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36
Functional overview
STM32L082xx
Table 4. Functionalities depending on the working mode
(from Run/active down to standby) (continued)(1)(2)
Standby
Run/Active
Sleep
Temperature
sensor
O
O
O
O
O
Comparators
O
O
O
O
O
16-bit timers
O
O
O
O
--
LPTIMER
O
O
O
O
O
O
IWDG
O
O
O
O
O
O
WWDG
O
O
O
O
--
--
Touch sensing
controller (TSC)
O
O
--
--
--
--
SysTick Timer
O
O
O
O
GPIOs
O
O
O
O
0 µs
0.36 µs
3 µs
32 µs
IPs
Wakeup time to
Run mode
Lowpower
sleep
Stop
Lowpower
run
Wakeup
capability
Wakeup
capability
--
O
---
O
O
-O
O
3.5 µs
2 pins
50 µs
0.28 µA (No
0.4 µA (No
RTC) VDD=1.8 V RTC) VDD=1.8 V
Consumption
VDD=1.8 to 3.6 V
(Typ)
Down to
140 µA/MHz
(from Flash
memory)
Down to
37 µA/MHz
(from Flash
memory)
Down to
8 µA
0.65 µA (with
0.8 µA (with
=1.8
V
RTC)
VDD=1.8 V
RTC)
V
DD
Down to
4.5 µA
0.4 µA (No
0.29 µA (No
RTC) VDD=3.0 V RTC) VDD=3.0 V
0.85 µA (with
1 µA (with RTC)
RTC) VDD=3.0 V
VDD=3.0 V
1. Legend: 
“Y” = Yes (enable). 
“O” = Optional can be enabled/disabled by software)
“-” = Not available
2. The consumption values given in this table are preliminary data given for indication. They are subject to slight changes.
3. Some peripherals with wakeup from Stop capability can request HSI to be enabled. In this case, HSI is woken up by the
peripheral, and only feeds the peripheral which requested it. HSI is automatically put off when the peripheral does not need
it anymore.
4. UART and LPUART reception is functional in Stop mode. It generates a wakeup interrupt on Start. To generate a wakeup
on address match or received frame event, the LPUART can run on LSE clock while the UART has to wake up or keep
running the HSI clock.
5. I2C address detection is functional in Stop mode. It generates a wakeup interrupt in case of address match. It will wake up
the HSI during reception.
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DocID027099 Rev 4
STM32L082xx
3.2
Functional overview
Interconnect matrix
Several peripherals are directly interconnected. This allows autonomous communication
between peripherals, thus saving CPU resources and power consumption. In addition,
these hardware connections allow fast and predictable latency.
Depending on peripherals, these interconnections can operate in Run, Sleep, Low-power
run, Low-power sleep and Stop modes.
Table 5. STM32L0xx peripherals interconnect matrix
Interconnect
source
Lowpower
sleep
Stop
Y
Y
-
Y
Y
Y
Y
Y
Y
Y
Y
-
Timer triggered by Auto
wake-up
Y
Y
Y
Y
-
LPTIM
Timer triggered by RTC
event
Y
Y
Y
Y
Y
TIMx
Clock source used as
input channel for RC
measurement and
trimming
Y
Y
Y
Y
-
CRS/HSI48
the clock recovery
system trims the HSI48
based on USB SOF
Y
Y
-
-
-
TIM3
USB_SOF is channel
input for calibration
Y
Y
-
-
-
TIMx
Timer input channel and
trigger
Y
Y
Y
Y
-
LPTIM
Timer input channel and
trigger
Y
Y
Y
Y
Y
ADC,DAC
Conversion trigger
Y
Y
Y
Y
-
Interconnect action
Run
TIM2,TIM21,
TIM22
Timer input channel,
trigger from analog
signals comparison
Y
Y
LPTIM
Timer input channel,
trigger from analog
signals comparison
Y
TIMx
Timer triggered by other
timer
TIM21
COMPx
TIMx
RTC
All clock
source
USB
GPIO
LowSleep power
run
Interconnect
destination
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36
Functional overview
3.3
STM32L082xx
ARM® Cortex®-M0+ core with MPU
The Cortex-M0+ processor is an entry-level 32-bit ARM Cortex processor designed for a
broad range of embedded applications. It offers significant benefits to developers, including:

a simple architecture that is easy to learn and program

ultra-low power, energy-efficient operation

excellent code density

deterministic, high-performance interrupt handling

upward compatibility with Cortex-M processor family

platform security robustness, with integrated Memory Protection Unit (MPU).
The Cortex-M0+ processor is built on a highly area and power optimized 32-bit processor
core, with a 2-stage pipeline Von Neumann architecture. The processor delivers exceptional
energy efficiency through a small but powerful instruction set and extensively optimized
design, providing high-end processing hardware including a single-cycle multiplier.
The Cortex-M0+ processor provides the exceptional performance expected of a modern 32bit architecture, with a higher code density than other 8-bit and 16-bit microcontrollers.
Owing to its embedded ARM core, the STM32L082xx are compatible with all ARM tools and
software.
Nested vectored interrupt controller (NVIC)
The ultra-low-power STM32L082xx embed a nested vectored interrupt controller able to
handle up to 32 maskable interrupt channels and 4 priority levels.
The Cortex-M0+ processor closely integrates a configurable Nested Vectored Interrupt
Controller (NVIC), to deliver industry-leading interrupt performance. The NVIC:

includes a Non-Maskable Interrupt (NMI)

provides zero jitter interrupt option

provides four interrupt priority levels
The tight integration of the processor core and NVIC provides fast execution of Interrupt
Service Routines (ISRs), dramatically reducing the interrupt latency. This is achieved
through the hardware stacking of registers, and the ability to abandon and restart loadmultiple and store-multiple operations. Interrupt handlers do not require any assembler
wrapper code, removing any code overhead from the ISRs. Tail-chaining optimization also
significantly reduces the overhead when switching from one ISR to another.
To optimize low-power designs, the NVIC integrates with the sleep modes, that include a
deep sleep function that enables the entire device to enter rapidly stop or standby mode.
This hardware block provides flexible interrupt management features with minimal interrupt
latency.
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DocID027099 Rev 4
STM32L082xx
Functional overview
3.4
Reset and supply management
3.4.1
Power supply schemes
3.4.2

VDD = 1.65 to 3.6 V: external power supply for I/Os and the internal regulator. Provided
externally through VDD pins.

VSSA, VDDA = 1.65 to 3.6 V: external analog power supplies for ADC reset blocks, RCs
and PLL. VDDA and VSSA must be connected to VDD and VSS, respectively.

VDD_USB = 1.65 to 3.6V: external power supply for USB transceiver, USB_DM (PA11)
and USB_DP (PA12). To guarantee a correct voltage level for USB communication
VDD_USB must be above 3.0V. If USB is not used this pin must be tied to VDD.
Power supply supervisor
The devices have an integrated ZEROPOWER power-on reset (POR)/power-down reset
(PDR) that can be coupled with a brownout reset (BOR) circuitry.
Two versions are available:

The version with BOR activated at power-on operates between 1.8 V and 3.6 V.

The other version without BOR operates between 1.65 V and 3.6 V.
After the VDD threshold is reached (1.65 V or 1.8 V depending on the BOR which is active or
not at power-on), the option byte loading process starts, either to confirm or modify default
thresholds, or to disable the BOR permanently: in this case, the VDD min value becomes
1.65 V (whatever the version, BOR active or not, at power-on).
When BOR is active at power-on, it ensures proper operation starting from 1.8 V whatever
the power ramp-up phase before it reaches 1.8 V. When BOR is not active at power-up, the
power ramp-up should guarantee that 1.65 V is reached on VDD at least 1 ms after it exits
the POR area.
Five BOR thresholds are available through option bytes, starting from 1.8 V to 3 V. To
reduce the power consumption in Stop mode, it is possible to automatically switch off the
internal reference voltage (VREFINT) in Stop mode. The device remains in reset mode when
VDD is below a specified threshold, VPOR/PDR or VBOR, without the need for any external
reset circuit.
Note:
The start-up time at power-on is typically 3.3 ms when BOR is active at power-up, the startup time at power-on can be decreased down to 1 ms typically for devices with BOR inactive
at power-up.
The devices feature an embedded programmable voltage detector (PVD) that monitors the
VDD/VDDA power supply and compares it to the VPVD threshold. This PVD offers 7 different
levels between 1.85 V and 3.05 V, chosen by software, with a step around 200 mV. An
interrupt can be generated when VDD/VDDA drops below the VPVD threshold and/or when
VDD/VDDA is higher than the VPVD threshold. The interrupt service routine can then generate
a warning message and/or put the MCU into a safe state. The PVD is enabled by software.
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36
Functional overview
3.4.3
STM32L082xx
Voltage regulator
The regulator has three operation modes: main (MR), low power (LPR) and power down.
3.5

MR is used in Run mode (nominal regulation)

LPR is used in the Low-power run, Low-power sleep and Stop modes

Power down is used in Standby mode. The regulator output is high impedance, the
kernel circuitry is powered down, inducing zero consumption but the contents of the
registers and RAM are lost except for the standby circuitry (wakeup logic, IWDG, RTC,
LSI, LSE crystal 32 KHz oscillator, RCC_CSR).
Clock management
The clock controller distributes the clocks coming from different oscillators to the core and
the peripherals. It also manages clock gating for low-power modes and ensures clock
robustness. It features:

Clock prescaler
To get the best trade-off between speed and current consumption, the clock frequency
to the CPU and peripherals can be adjusted by a programmable prescaler.

Safe clock switching
Clock sources can be changed safely on the fly in Run mode through a configuration
register.

Clock management
To reduce power consumption, the clock controller can stop the clock to the core,
individual peripherals or memory.

System clock source
Three different clock sources can be used to drive the master clock SYSCLK:

–
1-25 MHz high-speed external crystal (HSE), that can supply a PLL
–
16 MHz high-speed internal RC oscillator (HSI), trimmable by software, that can
supply a PLLMultispeed internal RC oscillator (MSI), trimmable by software, able
to generate 7 frequencies (65 kHz, 131 kHz, 262 kHz, 524 kHz, 1.05 MHz, 2.1
MHz, 4.2 MHz). When a 32.768 kHz clock source is available in the system (LSE),
the MSI frequency can be trimmed by software down to a ±0.5% accuracy.
Auxiliary clock source
Two ultra-low-power clock sources that can be used to drive the real-time clock:

–
32.768 kHz low-speed external crystal (LSE)
–
37 kHz low-speed internal RC (LSI), also used to drive the independent watchdog.
The LSI clock can be measured using the high-speed internal RC oscillator for
greater precision.
RTC clock source
The LSI, LSE or HSE sources can be chosen to clock the RTC, whatever the system
clock.

USB clock source
A 48 MHz clock trimmed through the USB SOF or LSE supplies the USB interface.
22/119
DocID027099 Rev 4
STM32L082xx

Functional overview
Startup clock
After reset, the microcontroller restarts by default with an internal 2.1 MHz clock (MSI).
The prescaler ratio and clock source can be changed by the application program as
soon as the code execution starts.

Clock security system (CSS)
This feature can be enabled by software. If an HSE clock failure occurs, the master
clock is automatically switched to HSI and a software interrupt is generated if enabled.
Another clock security system can be enabled, in case of failure of the LSE it provides
an interrupt or wakeup event which is generated if enabled.

Clock-out capability (MCO: microcontroller clock output)
It outputs one of the internal clocks for external use by the application.
Several prescalers allow the configuration of the AHB frequency, each APB (APB1 and
APB2) domains. The maximum frequency of the AHB and the APB domains is 32 MHz. See
Figure 2 for details on the clock tree.
DocID027099 Rev 4
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36
Functional overview
STM32L082xx
Figure 2. Clock tree
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24/119
DocID027099 Rev 4
STM32L082xx
3.6
Functional overview
Low-power real-time clock and backup registers
The real time clock (RTC) and the 5 backup registers are supplied in all modes including
standby mode. The backup registers are five 32-bit registers used to store 20 bytes of user
application data. They are not reset by a system reset, or when the device wakes up from
Standby mode.
The RTC is an independent BCD timer/counter. Its main features are the following:









Calendar with subsecond, seconds, minutes, hours (12 or 24 format), week day, date,
month, year, in BCD (binary-coded decimal) format
Automatically correction for 28, 29 (leap year), 30, and 31 day of the month
Two programmable alarms with wake up from Stop and Standby mode capability
Periodic wakeup from Stop and Standby with programmable resolution and period
On-the-fly correction from 1 to 32767 RTC clock pulses. This can be used to
synchronize it with a master clock.
Reference clock detection: a more precise second source clock (50 or 60 Hz) can be
used to enhance the calendar precision.
Digital calibration circuit with 1 ppm resolution, to compensate for quartz crystal
inaccuracy
2 anti-tamper detection pins with programmable filter. The MCU can be woken up from
Stop and Standby modes on tamper event detection.
Timestamp feature which can be used to save the calendar content. This function can
be triggered by an event on the timestamp pin, or by a tamper event. The MCU can be
woken up from Stop and Standby modes on timestamp event detection.
The RTC clock sources can be:




3.7
A 32.768 kHz external crystal
A resonator or oscillator
The internal low-power RC oscillator (typical frequency of 37 kHz)
The high-speed external clock
General-purpose inputs/outputs (GPIOs)
Each of the GPIO pins can be configured by software as output (push-pull or open-drain), as
input (with or without pull-up or pull-down) or as peripheral alternate function. Most of the
GPIO pins are shared with digital or analog alternate functions, and can be individually
remapped using dedicated alternate function registers. All GPIOs are high current capable.
Each GPIO output, speed can be slowed (40 MHz, 10 MHz, 2 MHz, 400 kHz). The alternate
function configuration of I/Os can be locked if needed following a specific sequence in order
to avoid spurious writing to the I/O registers. The I/O controller is connected to a dedicated
IO bus with a toggling speed of up to 32 MHz.
Extended interrupt/event controller (EXTI)
The extended interrupt/event controller consists of 29 edge detector lines used to generate
interrupt/event requests. Each line can be individually configured to select the trigger event
(rising edge, falling edge, both) and can be masked independently. A pending register
maintains the status of the interrupt requests. The EXTI can detect an external line with a
pulse width shorter than the Internal APB2 clock period. Up to 40 GPIOs can be connected
to the 16 configurable interrupt/event lines. The 13 other lines are connected to PVD, RTC,
USB, USARTs, I2C, LPUART, LPTIMER or comparator events.
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36
Functional overview
3.8
STM32L082xx
Memories
The STM32L082xx devices have the following features:

20 Kbytes of embedded SRAM accessed (read/write) at CPU clock speed with 0 wait
states. With the enhanced bus matrix, operating the RAM does not lead to any
performance penalty during accesses to the system bus (AHB and APB buses).

The non-volatile memory is divided into three arrays:
–
128 or 192 Kbytes of embedded Flash program memory
–
6 Kbytes of data EEPROM
–
Information block containing 32 user and factory options bytes plus Kbytes of
system memory
Flash program and data EEPROM are divided into two banks. This allows writing in one
bank while running code or reading data from the other bank.
The user options bytes are used to write-protect or read-out protect the memory (with
4 Kbyte granularity) and/or readout-protect the whole memory with the following options:

Level 0: no protection

Level 1: memory readout protected.
The Flash memory cannot be read from or written to if either debug features are
connected or boot in RAM is selected

Level 2: chip readout protected, debug features (Cortex-M0+ serial wire) and boot in
RAM selection disabled (debugline fuse)
The firewall protects parts of code/data from access by the rest of the code that is executed
outside of the protected area. The granularity of the protected code segment or the nonvolatile data segment is 256 bytes (Flash memory or EEPROM) against 64 bytes for the
volatile data segment (RAM).
The whole non-volatile memory embeds the error correction code (ECC) feature.
3.9
Boot modes
At startup, BOOT0 pin and nBOOT1 option bit are used to select one of three boot options:

Boot from Flash memory

Boot from System memory

Boot from embedded RAM
The boot loader is located in System memory. It is used to reprogram the Flash memory by
using USB (PA11, PA12), USART1(PA9, PA10) or USART2(PA2, PA3). See STM32™
microcontroller system memory boot mode AN2606 for details.
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STM32L082xx
3.10
Functional overview
Direct memory access (DMA)
The flexible 7-channel, general-purpose DMA is able to manage memory-to-memory,
peripheral-to-memory and memory-to-peripheral transfers. The DMA controller supports
circular buffer management, avoiding the generation of interrupts when the controller
reaches the end of the buffer.
Each channel is connected to dedicated hardware DMA requests, with software trigger
support for each channel. Configuration is done by software and transfer sizes between
source and destination are independent.
The DMA can be used with the main peripherals: AES, SPI, I2C, USART, LPUART,
general-purpose timers, DAC, and ADC.
3.11
Analog-to-digital converter (ADC)
A native 12-bit, extended to 16-bit through hardware oversampling, analog-to-digital
converter is embedded into STM32L082xx device. It has up to 13 external channels and 3
internal channels (temperature sensor, voltage reference). Three channels, PA0, PA4 and
PA5, are fast channels, while the others are standard channels.
The ADC performs conversions in single-shot or scan mode. In scan mode, automatic
conversion is performed on a selected group of analog inputs.
The ADC frequency is independent from the CPU frequency, allowing maximum sampling
rate of 1.14 MSPS even with a low CPU speed. The ADC consumption is low at all
frequencies (~25 µA at 10 kSPS, ~240 µA at 1MSPS). An auto-shutdown function
guarantees that the ADC is powered off except during the active conversion phase.
The ADC can be served by the DMA controller. It can operate from a supply voltage down to
1.65 V.
The ADC features a hardware oversampler up to 256 samples, this improves the resolution
to 16 bits (see AN2668).
An analog watchdog feature allows very precise monitoring of the converted voltage of one,
some or all scanned channels. An interrupt is generated when the converted voltage is
outside the programmed thresholds.
The events generated by the general-purpose timers (TIMx) can be internally connected to
the ADC start triggers, to allow the application to synchronize A/D conversions and timers.
3.12
Temperature sensor
The temperature sensor (TSENSE) generates a voltage VSENSE that varies linearly with
temperature.
The temperature sensor is internally connected to the ADC_IN18 input channel which is
used to convert the sensor output voltage into a digital value.
The sensor provides good linearity but it has to be calibrated to obtain good overall
accuracy of the temperature measurement. As the offset of the temperature sensor varies
from chip to chip due to process variation, the uncalibrated internal temperature sensor is
suitable for applications that detect temperature changes only.
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36
Functional overview
STM32L082xx
To improve the accuracy of the temperature sensor measurement, each device is
individually factory-calibrated by ST. The temperature sensor factory calibration data are
stored by ST in the system memory area, accessible in read-only mode.
Table 6. Temperature sensor calibration values
Calibration value name
3.12.1
Description
Memory address
TSENSE_CAL1
TS ADC raw data acquired at
temperature of 30 °C, 
VDDA= 3 V
0x1FF8 007A - 0x1FF8 007B
TSENSE_CAL2
TS ADC raw data acquired at
temperature of 130 °C
VDDA= 3 V
0x1FF8 007E - 0x1FF8 007F
Internal voltage reference (VREFINT)
The internal voltage reference (VREFINT) provides a stable (bandgap) voltage output for the
ADC and Comparators. VREFINT is internally connected to the ADC_IN17 input channel. It
enables accurate monitoring of the VDD value (when no external voltage, VREF+, is available
for ADC). The precise voltage of VREFINT is individually measured for each part by ST during
production test and stored in the system memory area. It is accessible in read-only mode.
Table 7. Internal voltage reference measured values
Calibration value name
VREFINT_CAL
3.13
Description
Raw data acquired at
temperature of 25 °C
VDDA = 3 V
Memory address
0x1FF8 0078 - 0x1FF8 0079
Digital-to-analog converter (DAC)
Two 12-bit buffered DACs an be used to convert digital signal into analog voltage signal
output. An optional amplifier can be used to reduce the output signal impedance.
This digital Interface supports the following features:

One data holding register (for each channel)

Left or right data alignment in 12-bit mode

Synchronized update capability

Noise-wave generation

Triangular-wave generation

Dual DAC channels with independent or simultaneous conversions

DMA capability (including the underrun interrupt)

External triggers for conversion

Input reference voltage VREF+
Six DAC trigger inputs are used in the STM32L082xx. The DAC channels isare triggered
through the timer update outputs that are also connected to different DMA channels.
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STM32L082xx
3.14
Functional overview
Ultra-low-power comparators and reference voltage
The STM32L082xx embed two comparators sharing the same current bias and reference
voltage. The reference voltage can be internal or external (coming from an I/O).

One comparator with ultra low consumption

One comparator with rail-to-rail inputs, fast or slow mode.

The threshold can be one of the following:
–
DAC output
–
External I/O pins
–
Internal reference voltage (VREFINT)
–
submultiple of Internal reference voltage(1/4, 1/2, 3/4) for the rail to rail
comparator.
Both comparators can wake up the devices from Stop mode, and be combined into a
window comparator.
The internal reference voltage is available externally via a low-power / low-current output
buffer (driving current capability of 1 µA typical).
3.15
Touch sensing controller (TSC)
The STM32L082xx provide a simple solution for adding capacitive sensing functionality to
any application. These devices offer up to 19 capacitive sensing channels distributed over 7
analog I/O groups.
Capacitive sensing technology is able to detect the presence of a finger near a sensor which
is protected from direct touch by a dielectric (such as glass, plastic). The capacitive variation
introduced by the finger (or any conductive object) is measured using a proven
implementation based on a surface charge transfer acquisition principle. It consists of
charging the sensor capacitance and then transferring a part of the accumulated charges
into a sampling capacitor until the voltage across this capacitor has reached a specific
threshold. To limit the CPU bandwidth usage, this acquisition is directly managed by the
hardware touch sensing controller and only requires few external components to operate.
The touch sensing controller is fully supported by the STMTouch touch sensing firmware
library, which is free to use and allows touch sensing functionality to be implemented reliably
in the end application.
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36
Functional overview
STM32L082xx
Table 8. Capacitive sensing GPIOs available on STM32L082xx devices
Group
1
2
3
4
3.16
Capacitive sensing
signal name
Pin
name
TSC_G5_IO1
-
TSC_G5_IO2
PB4
TSC_G5_IO3
PB6
PA3
TSC_G5_IO4
PB7
TSC_G2_IO1
PA4
TSC_G6_IO1
PB11
TSC_G2_IO2
PA5
TSC_G6_IO2
PB12
TSC_G2_IO3
PA6
TSC_G6_IO3
PB13
TSC_G2_IO4
PA7
TSC_G6_IO4
PB7
-
-
TSC_G7_IO1
PC0
TSC_G3_IO2
PB0
TSC_G7_IO2
PC1
TSC_G3_IO3
PB1
TSC_G7_IO3
PC2
TSC_G3_IO4
PB2
-
-
TSC_G4_IO1
PA9
TSC_G4_IO2
PA10
TSC_G4_IO3
PA11
TSC_G4_IO4
PA12
Capacitive sensing
signal name
Pin
name
TSC_G1_IO1
PA0
TSC_G1_IO2
PA1
TSC_G1_IO3
PA2
TSC_G1_IO4
Group
5
6
7
AES
The AES Hardware Accelerator can be used to encrypt and decrypt data using the AES
algorithm (compatible with FIPS PUB 197, 2001 Nov 26).

Key scheduler

Key derivation for decryption

128-bit data block processed

128-bit key length

213 clock cycles to encrypt/decrypt one 128-bit block

Electronic codebook (ECB), cypher block chaining (CBC), and counter mode (CTR)
supported by hardware.
The AES can be served by the DMA controller.
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STM32L082xx
3.17
Functional overview
Timers and watchdogs
The ultra-low-power STM32L082xx devices include three general-purpose timers, one lowpower timer (LPTIM), one basic timer, two watchdog timers and the SysTick timer.
Table 9 compares the features of the general-purpose and basic timers.
Table 9. Timer feature comparison
Timer
Counter
resolution
Counter type
Prescaler factor
DMA
request
generation
TIM2,
TIM3
16-bit
Up, down,
up/down
Any integer between
1 and 65536
Yes
4
No
TIM21,
TIM22
16-bit
Up, down,
up/down
Any integer between
1 and 65536
No
2
No
TIM6,
TIM7
16-bit
Up
Any integer between
1 and 65536
Yes
0
No
3.17.1
Capture/compare Complementary
channels
outputs
General-purpose timers (TIM2, TIM3, TIM21 and TIM22)
There are four synchronizable general-purpose timers embedded in the STM32L082xx
device (see Table 9 for differences).
TIM2, TIM3
TIM2 and TIM3 are based on 16-bit auto-reload up/down counter. It includes a 16-bit
prescaler. It features four independent channels each for input capture/output compare,
PWM or one-pulse mode output.
The TIM2/TIM3 general-purpose timers can work together or with the TIM21 and TIM22
general-purpose timers via the Timer Link feature for synchronization or event chaining.
Their counter can be frozen in debug mode. Any of the general-purpose timers can be used
to generate PWM outputs.
TIM2/TIM3 have independent DMA request generation.
These timers are capable of handling quadrature (incremental) encoder signals and the
digital outputs from 1 to 3 hall-effect sensors.
TIM21 and TIM22
TIM21 and TIM22 are based on a 16-bit auto-reload up/down counter. They include a 16-bit
prescaler. They have two independent channels for input capture/output compare, PWM or
one-pulse mode output. They can work together and be synchronized with the TIM2/TIM3,
full-featured general-purpose timers.
They can also be used as simple time bases and be clocked by the LSE clock source
(32.768 kHz) to provide time bases independent from the main CPU clock.
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36
Functional overview
3.17.2
STM32L082xx
Low-power Timer (LPTIM)
The low-power timer has an independent clock and is running also in Stop mode if it is
clocked by LSE, LSI or an external clock. It is able to wakeup the devices from Stop mode.
This low-power timer supports the following features:
3.17.3

16-bit up counter with 16-bit autoreload register

16-bit compare register

Configurable output: pulse, PWM

Continuous / one shot mode

Selectable software / hardware input trigger

Selectable clock source
–
Internal clock source: LSE, LSI, HSI or APB clock
–
External clock source over LPTIM input (working even with no internal clock
source running, used by the Pulse Counter Application)

Programmable digital glitch filter

Encoder mode
Basic timer (TIM6, TIM7)
These timers can be used as a generic 16-bit timebase.
3.17.4
SysTick timer
This timer is dedicated to the OS, but could also be used as a standard downcounter. It is
based on a 24-bit downcounter with autoreload capability and a programmable clock
source. It features a maskable system interrupt generation when the counter reaches ‘0’.
3.17.5
Independent watchdog (IWDG)
The independent watchdog is based on a 12-bit downcounter and 8-bit prescaler. It is
clocked from an independent 37 kHz internal RC and, as it operates independently of the
main clock, it can operate in Stop and Standby modes. It can be used either as a watchdog
to reset the device when a problem occurs, or as a free-running timer for application timeout
management. It is hardware- or software-configurable through the option bytes. The counter
can be frozen in debug mode.
3.17.6
Window watchdog (WWDG)
The window watchdog is based on a 7-bit downcounter that can be set as free-running. It
can be used as a watchdog to reset the device when a problem occurs. It is clocked from
the main clock. It has an early warning interrupt capability and the counter can be frozen in
debug mode.
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STM32L082xx
Functional overview
3.18
Communication interfaces
3.18.1
I2C bus
Up to three I2C interfaces (I2C1, I2C2 and I2C3) can operate in multimaster or slave modes.
Each I2C interface can support Standard mode (Sm, up to 100 kbit/s), Fast mode (Fm, up to
400 kbit/s) and Fast Mode Plus (Fm+, up to 1 Mbit/s) with 20 mA output drive on some I/Os.
7-bit and 10-bit addressing modes, multiple 7-bit slave addresses (2 addresses, 1 with
configurable mask) are also supported as well as programmable analog and digital noise
filters.
Table 10. Comparison of I2C analog and digital filters
Analog filter
Digital filter
Pulse width of
suppressed spikes
≥ 50 ns
Programmable length from 1 to 15
I2C peripheral clocks
Benefits
Available in Stop mode
1. Extra filtering capability vs.
standard requirements.
2. Stable length
Drawbacks
Variations depending on
temperature, voltage, process
Wakeup from Stop on address
match is not available when digital
filter is enabled.
In addition, I2C1 and I2C3 provide hardware support for SMBus 2.0 and PMBus 1.1: ARP
capability, Host notify protocol, hardware CRC (PEC) generation/verification, timeouts
verifications and ALERT protocol management. I2C1/I2C3 also have a clock domain
independent from the CPU clock, allowing the I2C1/I2C3 to wake up the MCU from Stop
mode on address match.
Each I2C interface can be served by the DMA controller.
Refer to Table 11 for an overview of I2C interface features.
Table 11. STM32L082xx I2C implementation
I2C features(1)
I2C1
I2C2
I2C3
7-bit addressing mode
X
X
X
10-bit addressing mode
X
X
X
Standard mode (up to 100 kbit/s)
X
X
X
Fast mode (up to 400 kbit/s)
X
X
X
Fast Mode Plus with 20 mA output drive I/Os (up to 1
Mbit/s)
X
X(2)
X
Independent clock
X
-
X
SMBus
X
-
X
Wakeup from STOP
X
-
X
1. X = supported.
2. See Table 15: STM32L072xxx pin definition on page 39 for the list of I/Os that feature Fast Mode Plus
capability
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36
Functional overview
3.18.2
STM32L082xx
Universal synchronous/asynchronous receiver transmitter (USART)
The four USART interfaces (USART1, USART2, USART4 and USART5) are able to
communicate at speeds of up to 4 Mbit/s.
They provide hardware management of the CTS, RTS and RS485 driver enable (DE)
signals, multiprocessor communication mode, master synchronous communication and
single-wire half-duplex communication mode. USART1 and USART2 also support
SmartCard communication (ISO 7816), IrDA SIR ENDEC, LIN Master/Slave capability, auto
baud rate feature and has a clock domain independent from the CPU clock, allowing to
wake up the MCU from Stop mode using baudrates up to 42 Kbaud.
All USART interfaces can be served by the DMA controller.
Table 12 for the supported modes and features of USART interfaces.
Table 12. USART implementation
USART modes/features(1)
USART1 and USART2
USART4 and USART5
Hardware flow control for modem
X
X
Continuous communication using DMA
X
X
Multiprocessor communication
X
X
X
X
Smartcard mode
X
-
Single-wire half-duplex communication
X
X
IrDA SIR ENDEC block
X
-
LIN mode
X
-
Dual clock domain and wakeup from Stop mode
X
-
Receiver timeout interrupt
X
-
Modbus communication
X
-
Auto baud rate detection (4 modes)
X
-
Driver Enable
X
X
Synchronous
mode(2)
1. X = supported.
2. This mode allows using the USART as an SPI master.
3.18.3
Low-power universal asynchronous receiver transmitter (LPUART)
The devices embed one Low-power UART. The LPUART supports asynchronous serial
communication with minimum power consumption. It supports half duplex single wire
communication and modem operations (CTS/RTS). It allows multiprocessor
communication.
The LPUART has a clock domain independent from the CPU clock. It can wake up the
system from Stop mode using baudrates up to 46 Kbaud. The Wakeup events from Stop
mode are programmable and can be:
34/119

Start bit detection

Or any received data frame

Or a specific programmed data frame
DocID027099 Rev 4
STM32L082xx
Functional overview
Only a 32.768 kHz clock (LSE) is needed to allow LPUART communication up to 9600
baud. Therefore, even in Stop mode, the LPUART can wait for an incoming frame while
having an extremely low energy consumption. Higher speed clock can be used to reach
higher baudrates.
LPUART interface can be served by the DMA controller.
3.18.4
Serial peripheral interface (SPI)/Inter-integrated sound (I2S)
Up to two SPIs are able to communicate at up to 16 Mbits/s in slave and master modes in
full-duplex and half-duplex communication modes. The 3-bit prescaler gives 8 master mode
frequencies and the frame is configurable to 8 bits or 16 bits. The hardware CRC
generation/verification supports basic SD Card/MMC modes.
The USARTs with synchronous capability can also be used as SPI master.
One standard I2S interfaces (multiplexed with SPI2) is available. It can operate in master or
slave mode, and can be configured to operate with a 16-/32-bit resolution as input or output
channels. Audio sampling frequencies from 8 kHz up to 192 kHz are supported. When the
I2S interfaces is configured in master mode, the master clock can be output to the external
DAC/CODEC at 256 times the sampling frequency.
The SPIs can be served by the DMA controller.
Table 13. SPI/I2S implementation
SPI features(1)
SPI1
SPI2
Hardware CRC calculation
X
X
I2S mode
-
X
TI mode
X
X
1. X = supported.
3.18.5
Universal serial bus (USB)
The STM32L082xx embeds a full-speed USB device peripheral compliant with the USB
specification version 2.0. The internal USB PHY supports USB FS signaling, embedded DP
pull-up and also battery charging detection according to Battery Charging Specification
Revision 1.2. The USB interface implements a full-speed (12 Mbit/s) function interface with
added support for USB 2.0 Link Power Management. It has software-configurable endpoint
setting with packet memory up to 1 KB and suspend/resume support. It requires a precise
48 MHz clock which can be generated from the internal main PLL (the clock source must
use a HSE crystal oscillator) or by the internal 48 MHz oscillator in automatic trimming
mode. The synchronization for this oscillator can be taken from the USB data stream itself
(SOF signalization) which allows crystal-less operation.
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36
Functional overview
3.19
STM32L082xx
Clock recovery system (CRS)
The STM32L082xx embeds a special block which allows automatic trimming of the internal
48 MHz oscillator to guarantee its optimal accuracy over the whole device operational
range. This automatic trimming is based on the external synchronization signal, which could
be either derived from USB SOF signalization, from LSE oscillator, from an external signal
on CRS_SYNC pin or generated by user software. For faster lock-in during startup it is also
possible to combine automatic trimming with manual trimming action.
3.20
Cyclic redundancy check (CRC) calculation unit
The CRC (cyclic redundancy check) calculation unit is used to get a CRC code using a
configurable generator polynomial value and size.
Among other applications, CRC-based techniques are used to verify data transmission or
storage integrity. In the scope of the EN/IEC 60335-1 standard, they offer a means of
verifying the Flash memory integrity. The CRC calculation unit helps compute a signature of
the software during runtime, to be compared with a reference signature generated at
linktime and stored at a given memory location.
3.21
Serial wire debug port (SW-DP)
An ARM SW-DP interface is provided to allow a serial wire debugging tool to be connected
to the MCU.
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STM32L082xx
Pin descriptions
Figure 3. STM32L082xx WLCSP49 ballout
$
9''B
86%
3$
3%
3%
%227
3%
9''
%
3$
3$
3%
3%
3%
9''
3&
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3$
3$
3%
3&
3&
'
3$
3$
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3$
3%
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3%
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3%
9''
3&
26&
B,1
3&
26&
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1567
3+
26&B,1
3+
26&B
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3$
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3&
3%
3$
3$
3$
9''$
3%
3%
3$
3$
3$
06Y9
1. The above figure shows the package top view.
2. I/O pin supplied by VDD_USB.
9''
3&26&B,1
3&26&B287
1567
9''$
3$
3$
3$
3%
3%
3%
3%
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Figure 4. STM32L082xx LQFP32 pinout
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3$
3$
3$
3$
3$
3$
3$
9''
3$
3$
3$
3$
3$
3%
3%
966
4
Pin descriptions
06Y9
1. The above figure shows the package top view.
DocID027099 Rev 4
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46
Pin descriptions
STM32L082xx
966
9''B86%
3$
3$
3$
3$
3$
3$
9''
3$
3$
3$
3$
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9''$
3$
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3%
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Figure 5. STM32L082xx UFQFPN32 pinout
06Y9
1. The above figure shows the package top view.
2. I/O pin supplied by VDD_USB.
Table 14. Legend/abbreviations used in the pinout table
Name
Pin name
Pin type
I/O structure
Abbreviation
Unless otherwise specified in brackets below the pin name, the pin function during
and after reset is the same as the actual pin name
S
Supply pin
I
Input only pin
I/O
Input / output pin
FT
5 V tolerant I/O
FTf
5 V tolerant I/O, FM+ capable
TC
Standard 3.3V I/O
B
RST
Notes
Pin functions
38/119
Definition
Dedicated BOOT0 pin
Bidirectional reset pin with embedded weak pull-up resistor
Unless otherwise specified by a note, all I/Os are set as floating inputs during and
after reset.
Alternate
functions
Functions selected through GPIOx_AFR registers
Additional
functions
Functions directly selected/enabled through peripheral registers
DocID027099 Rev 4
STM32L082xx
Pin descriptions
Table 15. STM32L072xxx pin definition
WLCSP49
1
-
B6
VDD
S
-
-
B7
PC13
I/O
FT
-
-
RTC_TAMP1/RTC_TS/
RTC_OUT/WKUP2
2
1
C6
PC14OSC32_IN
(PC14)
I/O
FT
-
-
OSC32_IN
3
2
C7
PC15OSC32_OUT I/O
(PC15)
TC
-
-
OSC32_OUT
-
-
D6
PH0-OSC_IN
I/O
(PH0)
TC
-
USB_CRS_SYNC
OSC_IN
-
-
D7
PH1OSC_OUT
(PH1)
I/O
TC
-
-
OSC_OUT
4
3
D5
NRST
I/O
-
-
-
-
LPTIM1_IN1,
EVENTOUT,
TSC_G7_IO1,
LPUART1_RX,
I2C3_SCL
ADC_IN10
ADC_IN11
-
-
C5
PC0
I/O
FTf
Note
UFQFPN32(1)
I/O structure
LQFP32
Pin name
(function
after reset)
Pin type
Pin number
Alternate functions
Additional functions
-
-
-
-
-
C4
PC1
I/O
FTf
-
LPTIM1_OUT,
EVENTOUT,
TSC_G7_IO2,
LPUART1_TX,
I2C3_SDA
-
-
E7
PC2
I/O
FTf
-
LPTIM1_IN2,
SPI2_MISO/I2S2_MCK,
TSC_G7_IO3
ADC_IN12
-
4
-
VSSA
S
-
-
-
-
-
E6
VREF+
S
-
-
-
5
5
F7
VDDA
S
-
-
-
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46
Pin descriptions
STM32L082xx
Table 15. STM32L072xxx pin definition (continued)
6
7
8
9
6
7
8
9
E4
F6
G7
PA0
PA1
PA2
PA3
I/O TTa
I/O
I/O
I/O
Note
I/O structure
Pin type
WLCSP49
E5
Pin name
(function
after reset)
Alternate functions
Additional functions
TIM2_CH1,
TSC_G1_IO1,
COMP1_INM,
USART2_CTS,
ADC_IN0,
TIM2_ETR, USART4_TX, RTC_TAMP2/WKUP1
COMP1_OUT
-
EVENTOUT, TIM2_CH2,
TSC_G1_IO2,
USART2_RTS,
COMP1_INP, ADC_IN1
TIM21_ETR,
USART4_RX
-
TIM21_CH1, TIM2_CH3,
TSC_G1_IO3,
USART2_TX,
LPUART1_TX,
COMP2_OUT
FT
-
TIM21_CH2, TIM2_CH4,
TSC_G1_IO4,
COMP2_INP, ADC_IN3
USART2_RX,
LPUART1_RX
SPI1_NSS,
TSC_G2_IO1,
USART2_CK,
TIM22_ETR
COMP1_INM,
COMP2_INM,
ADC_IN4, DAC_OUT1
FT
FT
COMP2_INM,
ADC_IN2
10
10
F5
PA4
I/O
TC
(2)
11
11
G6
PA5
I/O
TC
-
SPI1_SCK, TIM2_ETR,
TSC_G2_IO2, TIM2_CH1
COMP1_INM,
COMP2_INM,
ADC_IN5, DAC_OUT2
-
SPI1_MISO, TIM3_CH1,
TSC_G2_IO3,
LPUART1_CTS,
TIM22_CH1,
EVENTOUT,
COMP1_OUT
ADC_IN6
ADC_IN7
12
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UFQFPN32(1)
LQFP32
Pin number
12
G5
PA6
I/O
FT
13
13
F4
PA7
I/O
FT
-
SPI1_MOSI, TIM3_CH2,
TSC_G2_IO4,
TIM22_CH2,
EVENTOUT,
COMP2_OUT
14
14
G4
PB0
I/O
FT
-
EVENTOUT, TIM3_CH3,
ADC_IN8, VREF_OUT
TSC_G3_IO2
DocID027099 Rev 4
STM32L082xx
Pin descriptions
Table 15. STM32L072xxx pin definition (continued)
LQFP32
UFQFPN32(1)
WLCSP49
Pin type
I/O structure
Note
Pin number
Alternate functions
15
15
D3
PB1
I/O
FT
-
TIM3_CH4,
TSC_G3_IO3,
LPUART1_RTS
ADC_IN9, VREF_OUT
-
-
E3
PB2
I/O
FT
-
LPTIM1_OUT,
TSC_G3_IO4,
I2C3_SMBA
-
-
TIM2_CH3, TSC_SYNC,
LPUART1_TX,
SPI2_SCK, I2C2_SCL,
LPUART1_RX
-
-
EVENTOUT, TIM2_CH4,
TSC_G6_IO1,
LPUART1_RX,
I2C2_SDA,
LPUART1_TX
-
-
-
G3
Pin name
(function
after reset)
PB10
I/O
FT
-
-
F3
PB11
I/O
16
16
D4
VSS
S
-
-
-
17
17
G2
VDD
S
-
-
-
-
SPI2_NSS/I2S2_WS,
LPUART1_RTS_DE,
TSC_G6_IO2,
I2C2_SMBA,
EVENTOUT
-
-
SPI2_SCK/I2S2_CK,
MCO, TSC_G6_IO3,
LPUART1_CTS,
I2C2_SCL, TIM21_CH1
-
SPI2_MISO/I2S2_MCK,
RTC_OUT,
TSC_G6_IO4,
LPUART1_RTS_DE,
I2C2_SDA, TIM21_CH2
-
-
-
-
-
G1
F2
PB12
PB13
I/O
I/O
FT
Additional functions
FT
FTf
-
-
F1
PB14
I/O
FTf
-
-
E1
PB15
I/O
FT
-
SPI2_MOSI/I2S2_SD,
RTC_REFIN
-
18
18
D1
PA8
I/O
FTf
-
MCO, USB_CRS_SYNC,
EVENTOUT,
USART1_CK, I2C3_SCL
-
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46
Pin descriptions
STM32L082xx
Table 15. STM32L072xxx pin definition (continued)
LQFP32
UFQFPN32(1)
WLCSP49
Pin type
I/O structure
Note
Pin number
Alternate functions
19
19
E2
PA9
I/O
FTf
-
MCO, TSC_G4_IO1,
USART1_TX, I2C1_SCL,
I2C3_SMBA
-
20
20
C1
PA10
I/O
FTf
-
TSC_G4_IO2,
USART1_RX, I2C1_SDA
-
21
D2
PA11
I/O
Additional functions
FT
SPI1_MISO, EVENTOUT,
TSC_G4_IO3,
(3)
USART1_CTS,
COMP1_OUT
USB_DM
SPI1_MOSI, EVENTOUT,
TSC_G4_IO4,
USART1_RTS_DE,
COMP2_OUT
USB_DP
22
22
B1
PA12
I/O
FT
(3)
23
23
C2
PA13
I/O
FT
-
SWDIO, USB_OE,
LPUART1_RX
-
-
24
A1
VDD_USB
S
-
-
-
24
25
B2
PA14
I/O
-
SWCLK, USART2_TX,
LPUART1_TX
-
-
SPI1_NSS, TIM2_ETR,
EVENTOUT,
USART2_RX,
TIM2_CH1,
USART4_RTS_DE
-
-
SPI1_SCK, TIM2_CH2,
TSC_G5_O1,
EVENTOUT,
USART1__RTS_DE,
USART5_TX
COMP2_INM
-
SPI1_MISO, TIM3_CH1,
TSC_G5_IO2,
TIM22_CH1,
USART1_CTS,
USART5_RX, I2C3_SDA
COMP2_INP
25
26
27
42/119
21
Pin name
(function
after reset)
-
-
26
A2
A3
B3
PA15
PB3
PB4
I/O
I/O
I/O
FT
FT
FT
FTf
DocID027099 Rev 4
STM32L082xx
Pin descriptions
Table 15. STM32L072xxx pin definition (continued)
Alternate functions
28
27
A4
PB5
I/O
FT
-
SPI1_MOSI,
LPTIM1_IN1,
I2C1_SMBA,
TIM3_CH2/TIM22_CH2,
USART1_CK,
USART5_CK/USART5_R
TS_DE
29
28
B4
PB6
I/O
FTf
-
USART1_TX, I2C1_SCL,
LPTIM1_ETR,
TSC_G5_IO3
FTf
USART1_RX, I2C1_SDA,
LPTIM1_IN2,
TSC_G5_IO4,
USART4_CTS
LQFP32
Note
I/O structure
Pin name
(function
after reset)
Pin type
WLCSP49
UFQFPN32(1)
Pin number
30
29
C3
PB7
I/O
31
30
A5
BOOT0
I
-
-
B5
PB8
I/O
-
-
A6
PB9
32
31
-
-
32
A7
Additional functions
COMP2_INP
COMP2_INP
COMP2_INP,
VREF_PVD_IN
-
-
-
FTf
-
TSC_SYNC, I2C1_SCL
-
I/O
FTf
-
EVENTOUT, I2C1_SDA,
SPI2_NSS/I2S2_WS
-
VSS
S
-
-
-
-
VDD
S
-
-
-
-
1. UFQFPN32 pinout differs from other STM32 devices except STM32L07xxx and STM32L8xxx.
2. PA4 offers a reduced touch sensing sensitivity. It is thus recommended to use it as sampling capacitor I/O.
3. These pins are powered by VDD_USB. For all characteristics that refer to VDD, VDD_USB must be used
instead.
DocID027099 Rev 4
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46
AF0
DocID027099 Rev 4
Port A
Port
AF1
AF2
AF3
AF4
AF5
AF6
AF7
I2C1/TSC/
EVENTOUT
I2C1/USART1/2/L
PUART1/
TIM3/22/
EVENTOUT
SPI2/I2S2/I2C2/
USART1/
TIM2/21/22
I2C1/2/
LPUART1/
USART4/
UASRT5/TIM21/
EVENTOUT
I2C3/LPUART1/
COMP1/2/
TIM3
TIM2_CH1
TSC_G1_IO1
USART2_CTS
TIM2_ETR
USART4_TX
COMP1_OUT
SPI1/SPI2/I2S2/U
SPI1/SPI2/I2S2/L
SART1/2/
PUART1/
LPUART1/USB/L
SPI1/SPI2/I2S2/I2 USART5/USB/LP
PTIM1/TSC/
TIM1/TIM2/3/EVE
C1/TIM2/21
TIM2/21/22/
NTOUT/
EVENTOUT/
SYS_AF
SYS_AF
-
-
PA1
EVENTOUT
TIM2_CH2
TSC_G1_IO2
USART2_RTS_
DE
TIM21_ETR
USART4_RX
-
PA2
TIM21_CH1
TIM2_CH3
TSC_G1_IO3
USART2_TX
-
LPUART1_TX
COMP2_OUT
PA3
TIM21_CH2
TIM2_CH4
TSC_G1_IO4
USART2_RX
-
LPUART1_RX
-
PA4
SPI1_NSS
-
-
TSC_G2_IO1
USART2_CK
TIM22_ETR
-
-
PA5
SPI1_SCK
-
TIM2_ETR
TSC_G2_IO2
TIM2_CH1
-
-
PA6
SPI1_MISO
TIM3_CH1
TSC_G2_IO3
LPUART1_CTS
TIM22_CH1
EVENTOUT
COMP1_OUT
PA7
SPI1_MOSI
TIM3_CH2
TSC_G2_IO4
-
TIM22_CH2
EVENTOUT
COMP2_OUT
PA8
MCO
USB_CRS_
SYNC
EVENTOUT
USART1_CK
-
-
I2C3_SCL
PA9
MCO
-
TSC_G4_IO1
USART1_TX
-
I2C1_SCL
I2C3_SMBA
PA10
-
-
TSC_G4_IO2
USART1_RX
-
I2C1_SDA
-
PA11
SPI1_MISO
-
EVENTOUT
TSC_G4_IO3
USART1_CTS
-
-
COMP1_OUT
PA12
SPI1_MOSI
-
EVENTOUT
TSC_G4_IO4
USART1_RTS_
DE
-
-
COMP2_OUT
PA13
SWDIO
-
USB_OE
-
-
-
LPUART1_RX
-
PA14
SWCLK
-
-
-
USART2_TX
-
LPUART1_TX
-
PA15
SPI1_NSS
TIM2_ETR
EVENTOUT
USART2_RX
TIM2_CH1
USART4_RTS_
DE
-
STM32L082xx
PA0
Pin descriptions
44/119
Table 16. Alternate functions port A
AF0
Port
DocID027099 Rev 4
Port B
SPI1/SPI2/I2S2/
USART1/2/
LPUART1/USB/
LPTIM1/TSC/
TIM2/21/22/
EVENTOUT/
SYS_AF
AF1
AF2
AF3
AF4
AF5
AF6
AF7
SPI1/SPI2/I2S2/
LPUART1/
USART5/USB/L
PTIM1/TIM2/3/E
VENTOUT/
SYS_AF
I2C1/TSC/
EVENTOUT
I2C1/USART1/2/
LPUART1/
TIM3/22/
EVENTOUT
SPI2/I2S2/I2C2/
USART1/
TIM2/21/22
I2C1/2/
LPUART1/
USART4/
UASRT5/TIM21/
EVENTOUT
SPI1/SPI2/I2S2/I
2C1/TIM2/21
I2C3/LPUART1/
COMP1/2/
TIM3
EVENTOUT
TIM3_CH3
TSC_G3_IO2
-
-
-
-
PB1
-
TIM3_CH4
TSC_G3_IO3
LPUART1_RTS_DE
-
-
-
PB2
-
LPTIM1_OUT
TSC_G3_IO4
-
-
-
I2C3_SMBA
PB3
SPI1_SCK
TIM2_CH2
TSC_G5_IO1
EVENTOUT
USART1_RTS_DE
USART5_TX
-
PB4
SPI1_MISO
TIM3_CH1
TSC_G5_IO2
TIM22_CH1
USART1_CTS
USART5_RX
I2C3_SDA
PB5
SPI1_MOSI
LPTIM1_IN1
I2C1_SMBA
TIM3_CH2/
TIM22_CH2
USART1_CK
USART5_CK/
USART5_RTS_
DE
-
PB6
USART1_TX
I2C1_SCL
LPTIM1_ETR
TSC_G5_IO3
-
-
-
-
PB7
USART1_RX
I2C1_SDA
LPTIM1_IN2
TSC_G5_IO4
-
-
USART4_CTS
-
PB8
-
-
TSC_SYNC
I2C1_SCL
-
-
-
PB9
-
EVENTOUT
-
I2C1_SDA
SPI2_NSS/
I2S2_WS
-
-
PB10
-
TIM2_CH3
TSC_SYNC
LPUART1_TX
SPI2_SCK
I2C2_SCL
LPUART1_RX
PB11
EVENTOUT
TIM2_CH4
TSC_G6_IO1
LPUART1_RX
-
I2C2_SDA
LPUART1_TX
PB12
SPI2_NSS/I2S2_WS
LPUART1_RTS_
DE
TSC_G6_IO2
I2C2_SMBA
EVENTOUT
-
PB13
SPI2_SCK/I2S2_CK
MCO
TSC_G6_IO3
LPUART1_CTS
I2C2_SCL
TIM21_CH1
-
PB14
SPI2_MISO/
I2S2_MCK
RTC_OUT
TSC_G6_IO4
LPUART1_RTS_DE
I2C2_SDA
TIM21_CH2
-
PB15
SPI2_MOSI/
I2S2_SD
RTC_REFIN
-
-
-
-
-
-
Pin descriptions
45/119
PB0
STM32L082xx
Table 17. Alternate functions port B
AF0
SPI1/SPI2/I2S2/
USART1/2/
LPUART1/USB/
LPTIM1/TSC/
TIM2/21/22/
EVENTOUT/
SYS_AF
Port C
Port
AF1
AF2
AF3
AF4
AF5
AF6
AF7
SPI1/SPI2/I2S2/
LPUART1/
USART5/USB/
LPTIM1/TIM2/3
/EVENTOUT/SYS_AF
I2C1/TSC/
EVENTOUT
I2C1/USART1/2/
LPUART1/
TIM3/22/
EVENTOUT
SPI2/I2S2
/I2C2/
USART1/
TIM2/21/22
I2C1/2/
LPUART1/
USART4/
UASRT5/TIM21/E
VENTOUT
SPI1/SPI2/I2S2/I2C1/
TIM2/21
I2C3/LPUART1/
COMP1/2/
TIM3
DocID027099 Rev 4
PC0
LPTIM1_IN1
EVENTOUT
TSC_G7_IO1
LPUART1_RX
I2C3_SCL
PC1
LPTIM1_OUT
EVENTOUT
TSC_G7_IO2
LPUART1_TX
I2C3_SDA
PC2
LPTIM1_IN2
SPI2_MISO/
I2S2_MCK
TSC_G7_IO3
PC13
-
-
-
-
-
-
-
-
PC14
-
-
-
-
-
-
-
-
PC15
-
-
-
-
-
-
-
-
Pin descriptions
46/119
Table 18. Alternate functions port C
Table 19. Alternate functions port H
AF0
AF1
AF2
SPI1/SPI2/
I2S2/USART1/2/
LPUART1/USB/
LPTIM1/TSC/
TIM2/21/22/
EVENTOUT/
SYS_AF
PH0
PH1
Port H
Port
AF3
AF4
AF5
AF6
AF7
SPI1/SPI2/I2S2
/I2C1/TIM2/21
SPI1/SPI2/I2S2/
LPUART1/
USART5/USB/
LPTIM1/TIM2/3/
EVENTOUT/
SYS_AF
I2C1/TSC/
EVENTOUT
I2C1/USART1/2/
LPUART1/
TIM3/22/
EVENTOUT
SPI2/I2S2/I2C2/
USART1/
TIM2/21/22
I2C1/2/
LPUART1/
USART4/
UASRT5/TIM21/
EVENTOUT
I2C3/
LPUART1/
COMP1/2/
TIM3
USB_CRS_SYNC
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
STM32L082xx
STM32L082xx
5
Memory mapping
Memory mapping
Figure 6. Memory map
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[(
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[
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2SWLRQE\WHV
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[
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[
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[
RESERVED
[
65$0
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CONFIGURATION
[
[
5HVHUYHG
06Y9
1. Refer to the STM32L082xx reference manual for details on the Flash memory organization for each memory size.
DocID027099 Rev 4
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47
Electrical characteristics
STM32L082xx
6
Electrical characteristics
6.1
Parameter conditions
Unless otherwise specified, all voltages are referenced to VSS.
6.1.1
Minimum and maximum values
Unless otherwise specified the minimum and maximum values are guaranteed in the worst
conditions of ambient temperature, supply voltage and frequencies by tests in production on
100% of the devices with an ambient temperature at TA = 25 °C and TA = TAmax (given by
the selected temperature range).
Data based on characterization results, design simulation and/or technology characteristics
are indicated in the table footnotes and are not tested in production. Based on
characterization, the minimum and maximum values refer to sample tests and represent the
mean value plus or minus three times the standard deviation (mean±3σ).
6.1.2
Typical values
Unless otherwise specified, typical data are based on TA = 25 °C, VDD = 3.6 V (for the
1.65 V VDD 3.6 V voltage range). They are given only as design guidelines and are not
tested.
Typical ADC accuracy values are determined by characterization of a batch of samples from
a standard diffusion lot over the full temperature range, where 95% of the devices have an
error less than or equal to the value indicated (mean±2σ).
6.1.3
Typical curves
Unless otherwise specified, all typical curves are given only as design guidelines and are
not tested.
6.1.4
Loading capacitor
The loading conditions used for pin parameter measurement are shown in Figure 7.
6.1.5
Pin input voltage
The input voltage measurement on a pin of the device is described in Figure 8.
Figure 7. Pin loading conditions
Figure 8. Pin input voltage
0&8SLQ
0&8SLQ
& S)
9,1
DLF
48/119
DocID027099 Rev 4
DLF
STM32L082xx
6.1.6
Electrical characteristics
Power supply scheme
Figure 9. Power supply scheme
287
*3,2V
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9''
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6.1.7
Current consumption measurement
Figure 10. Current consumption measurement scheme
9''$
,''
1[9''
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1[966
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DocID027099 Rev 4
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106
Electrical characteristics
6.2
STM32L082xx
Absolute maximum ratings
Stresses above the absolute maximum ratings listed in Table 20: Voltage characteristics,
Table 21: Current characteristics, and Table 22: Thermal characteristics may cause
permanent damage to the device. These are stress ratings only and functional operation of
the device at these conditions is not implied. Exposure to maximum rating conditions for
extended periods may affect device reliability.
Table 20. Voltage characteristics
Symbol
VDD–VSS
VIN(2)
Definition
Min
Max
–0.3
4.0
Input voltage on FT and FTf pins
VSS  0.3
VDD+4.0
Input voltage on TC pins
VSS  0.3
4.0
Input voltage on BOOT0
VSS
VDD 4.0
VSS 0.3
4.0
External main supply voltage 
(including VDDA, VDD_USB, VDD)(1)
Input voltage on any other pin
|VDD|
Variations between different VDDx power pins
-
50
|VDDA-VDDx|
Variations between any VDDx and VDDA power
pins(3)
-
300
Variations between all different ground pins
-
50
-
0.4
|VSS|
VREF+ –VDDA Allowed voltage difference for VREF+ > VDDA
VESD(HBM)
Electrostatic discharge voltage 
(human body model)
Unit
V
mV
V
see Section 6.3.11
1. All main power (VDD,VDD_USB, VDDA) and ground (VSS, VSSA) pins must always be connected to the
external power supply, in the permitted range.
2.
VIN maximum must always be respected. Refer to Table 21 for maximum allowed injected current values.
3. It is recommended to power VDD and VDDA from the same source. A maximum difference of 300 mV
between VDD and VDDA can be tolerated during power-up and device operation. VDD_USB is independent
from VDD and VDDA: its value does not need to respect this rule.
50/119
DocID027099 Rev 4
STM32L082xx
Electrical characteristics
Table 21. Current characteristics
Symbol
Ratings
Max.
ΣIVDD(2)
Total current into sum of all VDD power lines (source)(1)
105
ΣIVSS(2)
(1)
Total current out of sum of all VSS ground lines (sink)
105
Total current into VDD_USB power lines (source)
25
ΣIVDD_USB
IVDD(PIN)
IVSS(PIN)
IIO
ΣIIO(PIN)
IINJ(PIN)
ΣIINJ(PIN)
Maximum current into each VDD power pin (source)(1)
100
(1)
Maximum current out of each VSS ground pin (sink)
100
Output current sunk by any I/O and control pin except FTf
pins
16
Output current sunk by FTf pins
22
Output current sourced by any I/O and control pin
-16
Total output current sunk by sum of all IOs and control pins
except PA11 and PA12(2)
90
Total output current sunk by PA11 and PA12
25
Total output current sourced by sum of all IOs and control
pins(2)
-90
Injected current on FT, FFf, RST and B pins
Unit
mA
-5/+0(3)
Injected current on TC pin
± 5(4)
Total injected current (sum of all I/O and control pins)(5)
± 25
1. All main power (VDD, VDDA) and ground (VSS, VSSA) pins must always be connected to the external power
supply, in the permitted range.
2. This current consumption must be correctly distributed over all I/Os and control pins. The total output
current must not be sunk/sourced between two consecutive power supply pins referring to high pin count
LQFP packages.
3. Positive current injection is not possible on these I/Os. A negative injection is induced by VIN<VSS. IINJ(PIN)
must never be exceeded. Refer to Table 20 for maximum allowed input voltage values.
4. A positive injection is induced by VIN > VDD while a negative injection is induced by VIN < VSS. IINJ(PIN)
must never be exceeded. Refer to Table 20: Voltage characteristics for the maximum allowed input voltage
values.
5. When several inputs are submitted to a current injection, the maximum IINJ(PIN) is the absolute sum of the
positive and negative injected currents (instantaneous values).
Table 22. Thermal characteristics
Symbol
TSTG
TJ
Ratings
Storage temperature range
Maximum junction temperature
DocID027099 Rev 4
Value
Unit
–65 to +150
°C
150
°C
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106
Electrical characteristics
STM32L082xx
6.3
Operating conditions
6.3.1
General operating conditions
Table 23. General operating conditions
Symbol
Parameter
Conditions
Min
Max
fHCLK
Internal AHB clock frequency
-
0
32
fPCLK1
Internal APB1 clock frequency
-
0
32
fPCLK2
Internal APB2 clock frequency
-
0
32
BOR detector disabled
1.65
3.6
BOR detector enabled, at power
on
1.8
3.6
BOR detector disabled, after
power on
1.65
3.6
VDD
Standard operating voltage
Unit
MHz
V
VDDA
Analog operating voltage (DAC not used)
Must be the same voltage as
VDD(1)
1.65
3.6
V
VDDA
Analog operating voltage (all features)
Must be the same voltage as
VDD(1)
1.8
3.6
V
USB peripheral used
3.0
3.6
USB peripheral not used
1.65
3.6
2.0 V  VDD  3.6 V
-0.3
5.5
1.65 V  VDD  2.0 V
-0.3
5.2
VDD_US Standard operating voltage, USB
domain(2)
B
Input voltage on FT, FTf and RST pins(3)
VIN
Input voltage on BOOT0 pin
-
0
5.5
Input voltage on TC pin
-
-0.3
VDD+0.3
-
417
-
556
-
333
WLCSP49 package
-
104
UFQFPN32 package
-
139
LQFP32 package
-
83
Maximum power dissipation
(range 6)
–40
85
Maximum power dissipation
(range 7)
–40
105
Maximum power dissipation
(range 3)
–40
125
Junction temperature range (range 6)
-40 °C  TA  85 °
–40
105
Junction temperature range (range 7)
-40 °C  TA  105 °C
–40
125
Junction temperature range (range 3)
-40 °C  TA  125 °C
–40
130
WLCSP49 package
PD
Power dissipation at TA = 85 °C (range 6) UFQFPN32 package
or TA =105 °C (rage 7) (4)
LQFP32 package
Power dissipation at TA = 125 °C (range
3) (4)
TA
TJ
Temperature range
1. It is recommended to power VDD and VDDA from the same source. A maximum difference of 300 mV between VDD and
VDDA can be tolerated during power-up and normal operation.
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STM32L082xx
Electrical characteristics
2. VDD_USB must respect the following conditions:
- When VDD is powered on (VDD < VDD_min), VDD_USB should be always lower than VDD.
- When VDD is powered down (VDD < VDD_min), VDD_USB should be always lower than VDD.
- In operating mode, VDD_USB could be lower or higher VDD.
- If the USB is not used, VDD_USB must range from VDD_min to VDD_max to be able to use PA11 and PA12 as standard I/Os.
3. To sustain a voltage higher than VDD+0.3V, the internal pull-up/pull-down resistors must be disabled.
4. If TA is lower, higher PD values are allowed as long as TJ does not exceed TJ max (see Table 82: Thermal characteristics
on page 115).
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Electrical characteristics
6.3.2
STM32L082xx
Embedded reset and power control block characteristics
The parameters given in the following table are derived from the tests performed under the
ambient temperature condition summarized in Table 23.
Table 24. Embedded reset and power control block characteristics
Symbol
Parameter
Conditions
VDD rise time rate
tVDD(1)
VDD fall time rate
TRSTTEMPO(1) Reset temporization
Typ
Max
BOR detector enabled
0
-

BOR detector disabled
0
-
1000
BOR detector enabled
20
-

BOR detector disabled
0
-
1000
VDD rising, BOR enabled
-
2
3.3
0.4
0.7
1.6
Falling edge
1
1.5
1.65
Rising edge
1.3
1.5
1.65
Falling edge
1.67
1.7
1.74
Rising edge
1.69
1.76
1.8
Falling edge
1.87
1.93
1.97
Rising edge
1.96
2.03
2.07
Falling edge
2.22
2.30
2.35
Rising edge
2.31
2.41
2.44
Falling edge
2.45
2.55
2.6
Rising edge
2.54
2.66
2.7
Falling edge
2.68
2.8
2.85
Rising edge
2.78
2.9
2.95
Falling edge
1.8
1.85
1.88
Rising edge
1.88
1.94
1.99
Falling edge
1.98
2.04
2.09
Rising edge
2.08
2.14
2.18
Falling edge
2.20
2.24
2.28
Rising edge
2.28
2.34
2.38
Falling edge
2.39
2.44
2.48
Rising edge
2.47
2.54
2.58
Falling edge
2.57
2.64
2.69
Rising edge
2.68
2.74
2.79
Falling edge
2.77
2.83
2.88
Rising edge
2.87
2.94
2.99
VDD rising, BOR
VPOR/PDR
Power on/power down reset
threshold
VBOR0
Brown-out reset threshold 0
VBOR1
Brown-out reset threshold 1
VBOR2
Brown-out reset threshold 2
VBOR3
Brown-out reset threshold 3
VBOR4
Brown-out reset threshold 4
VPVD0
Programmable voltage detector
threshold 0
VPVD1
PVD threshold 1
VPVD2
PVD threshold 2
VPVD3
PVD threshold 3
VPVD4
PVD threshold 4
VPVD5
PVD threshold 5
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µs/V
ms
V
STM32L082xx
Electrical characteristics
Table 24. Embedded reset and power control block characteristics (continued)
Symbol
Parameter
VPVD6
Conditions
PVD threshold 6
Hysteresis voltage
Vhyst
Min
Typ
Max
Falling edge
2.97
3.05
3.09
Rising edge
3.08
3.15
3.20
BOR0 threshold
-
40
-
All BOR and PVD thresholds
excepting BOR0
-
100
-
Unit
V
mV
1. Guaranteed by characterization results.
2. Valid for device version without BOR at power up. Please see option "D" in Ordering information scheme for more details.
6.3.3
Embedded internal reference voltage
The parameters given in Table 26 are based on characterization results, unless otherwise
specified.
Table 25. Embedded internal reference voltage calibration values
Calibration value name
Description
Memory address
Raw data acquired at
temperature of 25 °C
VDDA= 3 V
VREFINT_CAL
0x1FF8 0078 - 0x1FF8 0079
Table 26. Embedded internal reference voltage(1)
Symbol
Parameter
VREFINT out(2)
Internal reference voltage
Conditions
Min
Typ
Max
Unit
– 40 °C < TJ < +125 °C
1.202
1.224
1.242
V
TVREFINT
Internal reference startup time
-
-
2
3
ms
VVREF_MEAS
VDDA and VREF+ voltage during
VREFINT factory measure
-
2.99
3
3.01
V
AVREF_MEAS
Accuracy of factory-measured
VREFINT value(3)
Including uncertainties
due to ADC and
VDDA/VREF+ values
-
-
±5
mV
TCoeff(4)
Temperature coefficient
–40 °C < TJ < +125 °C
-
25
100
ppm/°C
ACoeff(4)
Long-term stability
1000 hours, T= 25 °C
-
-
1000
ppm
VDDCoeff(4)
Voltage coefficient
3.0 V < VDDA < 3.6 V
-
-
2000
ppm/V
TS_vrefint(4)(5)
ADC sampling time when
reading the internal reference
voltage
-
5
10
-
µs
TADC_BUF(4)
Startup time of reference
voltage buffer for ADC
-
-
-
10
µs
IBUF_ADC(4)
Consumption of reference
voltage buffer for ADC
-
-
13.5
25
µA
IVREF_OUT(4)
VREF_OUT output current(6)
-
-
-
1
µA
VREF_OUT output load
-
-
-
50
pF
CVREF_OUT
(4)
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Electrical characteristics
STM32L082xx
Table 26. Embedded internal reference voltage(1) (continued)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Consumption of reference
voltage buffer for VREF_OUT
and COMP
-
-
730
1200
nA
VREFINT_DIV1(4)
1/4 reference voltage
-
24
25
26
VREFINT_DIV2(4)
1/2 reference voltage
-
49
50
51
VREFINT_DIV3(4)
3/4 reference voltage
-
74
75
76
ILPBUF(4)
%
VREFINT
1. Refer to Table 38: Peripheral current consumption in Stop and Standby mode for the value of the internal reference current
consumption (IREFINT).
2. Guaranteed by test in production.
3. The internal VREF value is individually measured in production and stored in dedicated EEPROM bytes.
4. Guaranteed by design.
5. Shortest sampling time can be determined in the application by multiple iterations.
6. To guarantee less than 1% VREF_OUT deviation.
6.3.4
Supply current characteristics
The current consumption is a function of several parameters and factors such as the
operating voltage, temperature, I/O pin loading, device software configuration, operating
frequencies, I/O pin switching rate, program location in memory and executed binary code.
The current consumption is measured as described in Figure 10: Current consumption
measurement scheme.
All Run-mode current consumption measurements given in this section are performed with a
reduced code that gives a consumption equivalent to Dhrystone 2.1 code if not specified
otherwise.
The current consumption values are derived from the tests performed under ambient
temperature and VDD supply voltage conditions summarized in Table 23: General operating
conditions unless otherwise specified.
The MCU is placed under the following conditions:

All I/O pins are configured in analog input mode

All peripherals are disabled except when explicitly mentioned

The Flash memory access time and prefetch is adjusted depending on fHCLK
frequency and voltage range to provide the best CPU performance unless otherwise
specified.

When the peripherals are enabled fAPB1 = fAPB2 = fAPB

When PLL is on, the PLL inputs are equal to HSI = 16 MHz (if internal clock is used) or
HSE = 16 MHz (if HSE bypass mode is used)

The HSE user clock applied to OSCI_IN input follows the characteristic specified in
Table 40: High-speed external user clock characteristics

For maximum current consumption VDD = VDDA = 3.6 V is applied to all supply pins

For typical current consumption VDD = VDDA = 3.0 V is applied to all supply pins if not
specified otherwise
The parameters given in Table 48, Table 23 and Table 24 are derived from tests performed
under ambient temperature and VDD supply voltage conditions summarized in Table 23.
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Electrical characteristics
Table 27. Current consumption in Run mode, code with data processing running from
Flash memory
Symbol
Parameter
fHCLK
(MHz)
Typ
Max(1)
1
190
250
2
345
380
4
650
670
4
0,8
0,86
8
1,55
1,7
16
2,95
3,1
8
1,9
2,1
16
3,55
3,8
32
6,65
7,2
0,065
39
130
0,524
115
210
4,2
700
770
Range2,
Vcore=1.5 V
VOS[1:0]=10
16
2,9
3,2
Range1,
Vcore=1.8 V
VOS[1:0]=01
32
Condition
Range3,
Vcore=1.2 V
VOS[1:0]=11
fHSE = fHCLK up to
16MHz included,
fHSE = fHCLK/2 above
16 MHz (PLL ON)(2)
IDD (Run
from Flash
memory)
Range2,
Vcore=1.5 V
VOS[1:0]=10
Range1,
Vcore=1.8 V
VOS[1:0]=01
Supply current in Run
mode code executed
from Flash memory
MSI clock source
HSI clock source
(16MHz)
Range3,
Vcore=1.2 V
VOS[1:0]=11
Unit
µA
mA
µA
mA
7,15
7,4
1. Guaranteed by characterization results at 125 °C, unless otherwise specified.
2. Oscillator bypassed (HSEBYP = 1 in RCC_CR register).
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Electrical characteristics
STM32L082xx
Table 28. Current consumption in Run mode vs code type,
code with data processing running from Flash memory
Symbol
Parameter
Conditions
fHCLK
Range 3,
VCORE=1.2 V,
VOS[1:0]=11
Supply
IDD
current in
(Run
Run mode,
from
code
Flash executed
memory) from Flash
memory
Dhrystone
650
CoreMark
655
Fibonacci
fHSE = fHCLK up to
16 MHz included, fHSE
= fHCLK/2 above 16
MHz (PLL on)(1)
Range 1,
VCORE=1.8 V,
VOS[1:0]=01
Typ
Unit
485
4 MHz
µA
while(1)
385
while(1), 1WS,
prefetch off
375
Dhrystone
6,65
CoreMark
6,9
Fibonacci
32 MHz
6,75
while(1)
5,8
while(1), prefetch off
5,5
mA
1. Oscillator bypassed (HSEBYP = 1 in RCC_CR register).
Figure 11. IDD vs VDD, at TA= 25/55/85/105 °C, Run mode, code running from
Flash memory, Range 2, HSE, 1WS
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Electrical characteristics
Figure 12. IDD vs VDD, at TA= 25/55/85/105 °C, Run mode, code running from
Flash memory, Range 2, HSI16, 1WS
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Table 29. Current consumption in Run mode, code with data processing running from RAM
Symbol
Parameter
fHCLK
(MHz)
Typ
Max(1)
1
175
230
2
315
360
4
570
630
4
0,71
0,78
8
1,35
1,6
16
2,7
3
8
1,7
1,9
16
3,2
3,7
32
6,65
7,1
0,065
38
98
0,524
105
160
4,2
615
710
Range2,
Vcore=1.5 V
VOS[1:0]=10
16
2,85
3
Range1,
Vcore=1.8 V
VOS[1:0]=01
32
Condition
Range3,
Vcore=1.2 V
VOS[1:0]=11
fHSE = fHCLK up to
16 MHz included,
fHSE = fHCLK/2 above
16 MHz (PLL ON)(2)
IDD (Run
from RAM)
Range2,
Vcore=1.5 V
VOS[1:0]=10
Range1,
Vcore=1.8 V
VOS[1:0]=01
Supply current in Run
mode code executed
from RAM, Flash
memory switched off
MSI clock
HSI clock source
(16 MHz)
Range3,
Vcore=1.2 V
VOS[1:0]=11
Unit
µA
mA
µA
mA
6,85
7,3
1. Guaranteed by characterization results at 125 °C, unless otherwise specified.
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Electrical characteristics
STM32L082xx
2. Oscillator bypassed (HSEBYP = 1 in RCC_CR register).
Table 30. Current consumption in Run mode vs code type,
code with data processing running from RAM(1)
Symbol
Parameter
Conditions
fHCLK
Dhrystone
IDD (Run
from
RAM)
Supply current in
Run mode, code
executed from
RAM, Flash
memory switched
off
fHSE = fHCLK up to
16 MHz included,
fHSE = fHCLK/2 above
16 MHz (PLL on)(2)
Range 3,
VCORE=1.2 V,
VOS[1:0]=11
Range 1,
VCORE=1.8 V,
VOS[1:0]=01
CoreMark
Fibonacci
2. Oscillator bypassed (HSEBYP = 1 in RCC_CR register).
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4 MHz
670
410
375
Dhrystone
6,65
CoreMark
Fibonacci
Unit
570
while(1)
while(1)
1. Guaranteed by characterization results, unless otherwise specified.
Typ
32 MHz
6,95
5,9
5,2
µA
mA
STM32L082xx
Electrical characteristics
Table 31. Current consumption in Sleep mode
Symbol
Parameter
fHCLK (MHz)
Typ
Max(1)
1
43,5
110
2
72
140
4
130
200
4
160
220
8
305
380
16
590
690
8
370
460
16
715
840
32
1650
2000
0,065
18
93
0,524
31,5
110
4,2
140
230
Range2,
Vcore=1.5 V
VOS[1:0]=10
16
665
850
Range1,
Vcore=1.8 V
VOS[1:0]=01
32
1750
2100
1
57,5
130
2
84
160
4
150
220
4
170
240
8
315
400
16
605
710
8
380
470
16
730
860
32
1650
2000
0,065
29,5
110
0,524
44,5
120
4,2
150
240
Range2,
Vcore=1.5 V
VOS[1:0]=10
16
680
930
Range1,
Vcore=1.8 V
VOS[1:0]=01
32
1750
2200
Condition
Range3,
Vcore=1.2 V
VOS[1:0]=11
fHSE = fHCLK up to
16 MHz included,
fHSE = fHCLK/2 above
16 MHz (PLL ON)(2)
Range2,
Vcore=1.5 V
VOS[1:0]=10
Range1,
Vcore=1.8 V
VOS[1:0]=01
Supply current in
Sleep mode, Flash
memory switched
OFF
Range3,
Vcore=1.2 V
VOS[1:0]=11
MSI clock
HSI clock source
(16 MHz)
IDD
(Sleep)
Range3,
Vcore=1.2 V
VOS[1:0]=11
fHSE = fHCLK up to
16MHz included,
fHSE = fHCLK/2 above
16 MHz (PLL ON)(2)
Range2,
Vcore=1.5 V
VOS[1:0]=10
Range1,
Vcore=1.8 V
VOS[1:0]=01
Supply current in
Sleep mode, Flash
memory switched
ON
Range3,
Vcore=1.2 V
VOS[1:0]=11
MSI clock
HSI clock source
(16MHz)
Unit
µA
1. Guaranteed by characterization results at 125 °C, unless otherwise specified.
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Electrical characteristics
STM32L082xx
2. Oscillator bypassed (HSEBYP = 1 in RCC_CR register).
Table 32. Current consumption in Low-power run mode
Symbol
Parameter
fHCLK
(MHz)
Typ
Max(1)
9,45
12
14
58
21
64
36,5
160
14,5
18
19,5
60
26
65
42
160
26,5
30
27,5
60
31
66
TA = 105°C
37,5
77
TA = 125°C
53,5
170
TA = − 40 to 25°C
24,5
34
30
82
38,5
90
TA = 125°C
58
120
TA = − 40 to 25°C
30,5
40
36,5
88
45
96
TA = 125°C
64,5
120
TA = − 40 to 25°C
45
56
TA = 55°C
48
96
51
110
TA = 105°C
59,5
120
TA = 125°C
79,5
150
Condition
TA = − 40 to 25°C
TA = 85°C
MSI clock = 65 kHz,
fHCLK= 32 kHz
TA = 105°C
0,032
TA = 125°C
TA = − 40 to 25°C
All peripherals
OFF, code
TA = 85°C
MSI clock = 65 kHz,
executed from
0,065
f
=
65kHz
HCLK
TA = 105°C
RAM, Flash
memory switched
TA = 125°C
OFF, VDD from
1.65 to 3.6 V
TA = − 40 to 25°C
TA = 55°C
MSI clock=131 kHz,
fHCLK= 131 kHz
IDD
(LP Run)
Supply
current in
Low-power
run mode
TA = 85°C
TA = 85°C
MSI clock = 65 kHz,
fHCLK= 32 kHz
All peripherals
OFF, code
MSI clock = 65 kHz,
executed from
fHCLK= 65 kHz
Flash memory,
VDD from 1.65 V
to 3.6 V
TA = 105°C
TA = 85°C
TA = 105°C
MSI clock =
131 kHz,
fHCLK= 131 kHz
TA = 85°C
1. Guaranteed by characterization results at 125 °C, unless otherwise specified.
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0,131
0,032
0,065
0,131
Unit
µA
STM32L082xx
Electrical characteristics
Figure 13. IDD vs VDD, at TA= 25 °C, Low-power run mode, code running
from RAM, Range 3, MSI (Range 0) at 64 KHz, 0 WS
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Table 33. Current consumption in Low-power sleep mode
Symbol
Parameter
Condition
Max
(1)
MSI clock = 65 kHz,
fHCLK= 32 kHz,
TA = − 40 to 25°C
Flash memory OFF
4,7
-
TA = − 40 to 25°C
17
24
TA = 85°C
19,5
30
TA= 105°C
23
47
TA= 125°C
32,5
70
TA= − 40 to 25°C
17
24
TA= 85°C
20
31
TA = 105°C
23,5
47
TA = 125°C
32,5
70
TA= − 40 to 25°C
19,5
27
TA = 55°C
20,5
28
TA = 85°C
22,5
33
TA = 105°C
26
50
TA= 125°C
35
73
MSI clock = 65 kHz,
fHCLK= 32 kHz
All peripherals
Supply current in
OFF, code
IDD
Low-power sleep
executed from
(LP Sleep)
mode
Flash memory, VDD
from 1.65 to 3.6 V
Typ
MSI clock = 65 kHz,
fHCLK= 65 kHz
MSI clock = 131kHz,
fHCLK= 131 kHz
Unit
µA
1. Guaranteed by characterization results at 125 °C, unless otherwise specified.
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Electrical characteristics
STM32L082xx
Table 34. Typical and maximum current consumptions in Stop mode
Symbol
Parameter
Max(1) Unit
Conditions
Typ
TA = − 40 to 25°C
0,43
1,00
TA = 55°C
0,735
2,50
TA= 85°C
2,25
4,90
TA = 105°C
5,3
13,00
TA = 125°C
12,5
28,00
IDD (Stop) Supply current in Stop mode
µA
1. Guaranteed by characterization results at 125 °C, unless otherwise specified.
Figure 14. IDD vs VDD, at TA= 25/55/ 85/105/125 °C, Stop mode with RTC enabled
and running on LSE Low drive
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Electrical characteristics
Figure 15. IDD vs VDD, at TA= 25/55/85/105/125 °C, Stop mode with RTC disabled,
all clocks off
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Table 35. Typical and maximum current consumptions in Standby mode
Symbol
Parameter
Typ
Max(1)
TA = − 40 to 25°C
0,855
1,70
TA = 55 °C
-
2,90
TA= 85 °C
-
3,30
TA = 105 °C
-
4,10
TA = 125 °C
-
8,50
TA = − 40 to 25°C
0,29
0,60
TA = 55 °C
0,32
1,20
TA = 85 °C
0,5
2,30
TA = 105 °C
0,94
3,00
TA = 125 °C
2,6
7,00
Conditions
Independent watchdog
and LSI enabled
IDD
Supply current in Standby
(Standby)
mode
Independent watchdog
and LSI off
Unit
µA
1. Guaranteed by characterization results at 125 °C, unless otherwise specified
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Electrical characteristics
STM32L082xx
Table 36. Average current consumption during Wakeup
System frequency
Current
consumption
during wakeup
HSI
1
HSI/4
0,7
MSI clock = 4,2 MHz
0,7
MSI clock = 1,05 MHz
0,4
MSI clock = 65 KHz
0,1
Reset pin pulled down
-
0,21
BOR on
-
0,23
IDD (Wakeup from With Fast wakeup set
StandBy)
With Fast wakeup disabled
MSI clock = 2,1 MHz
0,5
MSI clock = 2,1 MHz
0,12
Symbol
parameter
IDD (Wakeup from Supply current during Wakeup from
Stop)
Stop mode
IDD (Reset)
IDD (Power-up)
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Unit
mA
STM32L082xx
Electrical characteristics
On-chip peripheral current consumption
The current consumption of the on-chip peripherals is given in the following tables. The
MCU is placed under the following conditions:

all I/O pins are in input mode with a static value at VDD or VSS (no load)

all peripherals are disabled unless otherwise mentioned

the given value is calculated by measuring the current consumption
–
with all peripherals clocked off
–
with only one peripheral clocked on
Table 37. Peripheral current consumption in Run or Sleep mode(1)
Typical consumption, VDD = 3.0 V, TA = 25 °C
Peripheral
CRS
APB1
Range 2,
Range 3,
Range 1,
VCORE=1.8 V VCORE=1.5 V VCORE=1.2 V
VOS[1:0] = 01 VOS[1:0] = 10 VOS[1:0] = 11
Low-power
sleep and
run
2.5
2
2
2
DAC1/2
4
3.5
3
2.5
I2C1
11
9.5
7.5
9
I2C2
4
3.5
3
2.5
I2C3
11
9
7
9
LPTIM1
10
8.5
6.5
8
LPUART1
8
6.5
5.5
6
USB
8.5
4.5
4
4.5
USART2
14.5
12
9.5
11
USART4
5
4
3
5
USART5
5
4
3
5
TIM2
10.5
8.5
7
9
TIM3
12
10
8
11
TIM6
3.5
3
2.5
2
TIM7
3.5
3
2.5
2
3
2
2
2
WWDG
DocID027099 Rev 4
Unit
µA/MHz
(fHCLK)
67/119
106
Electrical characteristics
STM32L082xx
Table 37. Peripheral current consumption in Run or Sleep mode(1) (continued)
Typical consumption, VDD = 3.0 V, TA = 25 °C
Peripheral
ADC1(2)
Range 2,
Range 3,
Range 1,
VCORE=1.8 V VCORE=1.5 V VCORE=1.2 V
VOS[1:0] = 01 VOS[1:0] = 10 VOS[1:0] = 11
Low-power
sleep and
run
Unit
5.5
5
3.5
4
4
3
3
2.5
USART1
14.5
11.5
9.5
12
TIM21
7.5
6
5
5.5
TIM22
7
6
5
6
FIREWALL
1.5
1
1
0.5
DBGMCU
1.5
1
1
0.5
SYSCFG
2.5
2
2
1.5
GPIOA
3.5
3
2.5
2.5
GPIOB
3.5
2.5
2
2.5
Cortex- GPIOC
M0+ core
I/O port GPIOH
8.5
6.5
5.5
7
1.5
1
1
0.5
CRC
1.5
1
1
1
FLASH
0(3)
0(3)
0(3)
0(3)
DMA1
10
8
6.5
8.5
RNG
5.5
1
0.5
0.5
TSC
3
2.5
2
3
AES
(3)
0
0(3)
0(3)
0(3)
All enabled
204
162
130
202
µA/MHz
(fHCLK)
PWR
2.5
2
2
1
µA/MHz
(fHCLK)
SPI1
APB2
AHB
µA/MHz
(fHCLK)
µA/MHz
(fHCLK)
µA/MHz
(fHCLK)
1. Data based on differential IDD measurement between all peripherals off an one peripheral with clock
enabled, in the following conditions: fHCLK = 32 MHz (range 1), fHCLK = 16 MHz (range 2), fHCLK = 4 MHz
(range 3), fHCLK = 64kHz (Low-power run/sleep), fAPB1 = fHCLK, fAPB2 = fHCLK, default prescaler value for
each peripheral. The CPU is in Sleep mode in both cases. No I/O pins toggling. Not tested in production.
2. HSI oscillator is off for this measure.
3. Current consumption is negligible and close to 0 µA.
68/119
DocID027099 Rev 4
STM32L082xx
Electrical characteristics
Table 38. Peripheral current consumption in Stop and Standby mode(1)
Symbol
IDD(PVD / BOR)
-
IREFINT
-
-
Typical consumption, TA = 25 °C
Peripheral
LSE Low
drive(2)
VDD=1.8 V
VDD=3.0 V
0.7
1.2
-
1.7
0.11
0,13
-
LSI
0.27
0.31
-
IWDG
0.2
0.3
-
LPTIM1, Input 100 Hz
0.01
0,01
-
LPTIM1, Input 1 MHz
11
12
-
LPUART1
-
0,5
-
RTC
0.16
0,3
Unit
µA
1. LPTIM, LPUART peripherals can operate in Stop mode but not in Standby mode.
2.
LSE Low drive consumption is the difference between an external clock on OSC32_IN and a quartz between OSC32_IN
and OSC32_OUT.-
6.3.5
Wakeup time from low-power mode
The wakeup times given in the following table are measured with the MSI or HSI16 RC
oscillator. The clock source used to wake up the device depends on the current operating
mode:

Sleep mode: the clock source is the clock that was set before entering Sleep mode

Stop mode: the clock source is either the MSI oscillator in the range configured before
entering Stop mode, the HSI16 or HSI16/4.

Standby mode: the clock source is the MSI oscillator running at 2.1 MHz
All timings are derived from tests performed under ambient temperature and VDD supply
voltage conditions summarized in Table 23.
Table 39. Low-power mode wakeup timings
Symbol
tWUSLEEP
Parameter
Conditions
Wakeup from Sleep mode
tWUSLEEP_ Wakeup from Low-power sleep mode,
fHCLK = 262 kHz
LP
Typ
Max
fHCLK = 32 MHz
7
8
fHCLK = 262 kHz
Flash memory enabled
7
8
fHCLK = 262 kHz
Flash memory switched OFF
9
10
DocID027099 Rev 4
Unit
Number
of clock
cycles
69/119
106
Electrical characteristics
STM32L082xx
Table 39. Low-power mode wakeup timings (continued)
Symbol
tWUSTOP
tWUSTDBY
70/119
Parameter
Conditions
Typ
Max
fHCLK = fMSI = 4.2 MHz
Wakeup from Stop mode, regulator in Run
fHCLK = fHSI = 16 MHz
mode
fHCLK = fHSI/4 = 4 MHz
5.0
8
4.9
7
8.0
11
fHCLK = fMSI = 4.2 MHz
Voltage range 1
5.0
8
fHCLK = fMSI = 4.2 MHz
Voltage range 2
5.0
8
fHCLK = fMSI = 4.2 MHz
Voltage range 3
5.0
8
7.3
13
13
23
28
38
fHCLK = fMSI = 262 kHz
51
65
fHCLK = fMSI = 131 kHz
100
120
fHCLK = MSI = 65 kHz
190
260
fHCLK = fHSI = 16 MHz
4.9
7
fHCLK = fHSI/4 = 4 MHz
8.0
11
fHCLK = fHSI = 16 MHz
Wakeup from Stop mode, regulator in lowfHCLK = fHSI/4 = 4 MHz
power mode, code running from RAM
fHCLK = fMSI = 4.2 MHz
4.9
7
7.9
10
4.7
8
Wakeup from Standby mode
FWU bit = 1
fHCLK = MSI = 2.1 MHz
65
130
Wakeup from Standby mode
FWU bit = 0
fHCLK = MSI = 2.1 MHz
2.2
3
fHCLK = fMSI = 2.1 MHz
Wakeup from Stop mode, regulator in lowfHCLK = fMSI = 1.05 MHz
power mode
fHCLK = fMSI = 524 kHz
DocID027099 Rev 4
Unit
µs
ms
STM32L082xx
6.3.6
Electrical characteristics
External clock source characteristics
High-speed external user clock generated from an external source
In bypass mode the HSE oscillator is switched off and the input pin is a standard GPIO.The
external clock signal has to respect the I/O characteristics in Section 6.3.12. However, the
recommended clock input waveform is shown in Figure 16.
Table 40. High-speed external user clock characteristics(1)
Symbol
fHSE_ext
Parameter
User external clock source
frequency
Conditions
Min
Typ
Max
Unit
CSS is on or
PLL is used
1
8
32
MHz
CSS is off, PLL
not used
0
8
32
MHz
VHSEH
OSC_IN input pin high level voltage
0.7VDD
-
VDD
VHSEL
OSC_IN input pin low level voltage
VSS
-
0.3VDD
tw(HSE)
tw(HSE)
OSC_IN high or low time
12
-
-
tr(HSE)
tf(HSE)
OSC_IN rise or fall time
-
-
20
OSC_IN input capacitance
-
2.6
-
pF
45
-
55
%
-
-
±1
µA
Cin(HSE)
ns
-
DuCy(HSE) Duty cycle
IL
OSC_IN Input leakage current
V
VSS VIN VDD
1. Guaranteed by design.
Figure 16. High-speed external clock source AC timing diagram
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71/119
106
Electrical characteristics
STM32L082xx
Low-speed external user clock generated from an external source
The characteristics given in the following table result from tests performed using a lowspeed external clock source, and under ambient temperature and supply voltage conditions
summarized in Table 23.
Table 41. Low-speed external user clock characteristics(1)
Symbol
Parameter
Conditions
fLSE_ext
User external clock source
frequency
VLSEH
OSC32_IN input pin high level
voltage
VLSEL
OSC32_IN input pin low level
voltage
tw(LSE)
tw(LSE)
OSC32_IN high or low time
tr(LSE)
tf(LSE)
OSC32_IN rise or fall time
CIN(LSE)
Typ
Max
Unit
1
32.768
1000
kHz
0.7VDD
-
VDD
V
-
VSS
-
0.3VDD
465
-
ns
-
-
10
-
-
0.6
-
pF
-
45
-
55
%
VSS VIN VDD
-
-
±1
µA
OSC32_IN input capacitance
DuCy(LSE) Duty cycle
IL
Min
OSC32_IN Input leakage current
1. Guaranteed by design, not tested in production
Figure 17. Low-speed external clock source AC timing diagram
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72/119
DocID027099 Rev 4
STM32L082xx
Electrical characteristics
High-speed external clock generated from a crystal/ceramic resonator
The high-speed external (HSE) clock can be supplied with a 1 to 25 MHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on
characterization results obtained with typical external components specified in Table 42. In
the application, the resonator and the load capacitors have to be placed as close as
possible to the oscillator pins in order to minimize output distortion and startup stabilization
time. Refer to the crystal resonator manufacturer for more details on the resonator
characteristics (frequency, package, accuracy).
Table 42. HSE oscillator characteristics(1)
Symbol
Parameter
Conditions
fOSC_IN Oscillator frequency
RF
Feedback resistor
Gm
Maximum critical crystal
transconductance
tSU(HSE)
(2)
Startup time
Min Typ
-
1
-
-
Startup
VDD is stabilized
Max Unit
25
MHz
200
-
k
-
-
700
µA
/V
-
2
-
ms
1. Guaranteed by design.
2. Guaranteed by characterization results. tSU(HSE) is the startup time measured from the moment it is
enabled (by software) to a stabilized 8 MHz oscillation is reached. This value is measured for a standard
crystal resonator and it can vary significantly with the crystal manufacturer.
For CL1 and CL2, it is recommended to use high-quality external ceramic capacitors in the
5 pF to 25 pF range (typ.), designed for high-frequency applications, and selected to match
the requirements of the crystal or resonator (see Figure 18). CL1 and CL2 are usually the
same size. The crystal manufacturer typically specifies a load capacitance which is the
series combination of CL1 and CL2. PCB and MCU pin capacitance must be included (10 pF
can be used as a rough estimate of the combined pin and board capacitance) when sizing
CL1 and CL2. Refer to the application note AN2867 “Oscillator design guide for ST
microcontrollers” available from the ST website www.st.com.
Figure 18. HSE oscillator circuit diagram
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73/119
106
Electrical characteristics
STM32L082xx
Low-speed external clock generated from a crystal/ceramic resonator
The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on
characterization results obtained with typical external components specified in Table 43. In
the application, the resonator and the load capacitors have to be placed as close as
possible to the oscillator pins in order to minimize output distortion and startup stabilization
time. Refer to the crystal resonator manufacturer for more details on the resonator
characteristics (frequency, package, accuracy).
Table 43. LSE oscillator characteristics(1)
Symbol
fLSE
Gm
Conditions(2)
Min(2)
Typ
Max
Unit
-
32.768
-
kHz
LSEDRV[1:0]=00
lower driving capability
-
-
0.5
LSEDRV[1:0]= 01
medium low driving capability
-
-
0.75
LSEDRV[1:0] = 10
medium high driving capability
-
-
1.7
LSEDRV[1:0]=11
higher driving capability
-
-
2.7
VDD is stabilized
-
2
-
Parameter
LSE oscillator frequency
Maximum critical crystal
transconductance
tSU(LSE)(3) Startup time
µA/V
s
1. Guaranteed by design.
2. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for
ST microcontrollers”.
3. Guaranteed by characterization results. tSU(LSE) is the startup time measured from the moment it is enabled (by software)
to a stabilized 32.768 kHz oscillation is reached. This value is measured for a standard crystal resonator and it can vary
significantly with the crystal manufacturer. To increase speed, address a lower-drive quartz with a high- driver mode.
Note:
For information on selecting the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from the ST website www.st.com.
Figure 19. Typical application with a 32.768 kHz crystal
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74/119
An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden
to add one.
DocID027099 Rev 4
STM32L082xx
6.3.7
Electrical characteristics
Internal clock source characteristics
The parameters given in Table 44 are derived from tests performed under ambient
temperature and VDD supply voltage conditions summarized in Table 23.
High-speed internal 16 MHz (HSI16) RC oscillator
Table 44. 16 MHz HSI16 oscillator characteristics
Symbol
fHSI16
TRIM
(1)(2)
ACCHSI16
(2)
Parameter
Conditions
Min
Typ
Max
Unit
Frequency
VDD = 3.0 V
-
16
-
MHz
HSI16 usertrimmed resolution
Trimming code is not a multiple of 16
-
0.4
0.7
%
Trimming code is a multiple of 16
-
Accuracy of the
factory-calibrated
HSI16 oscillator
-
1.5
%
VDDA = 3.0 V, TA = 25 °C
-1(3)
-
1(3)
%
VDDA = 3.0 V, TA = 0 to 55 °C
-1.5
-
1.5
%
VDDA = 3.0 V, TA = -10 to 70 °C
-2
-
2
%
VDDA = 3.0 V, TA = -10 to 85 °C
-2.5
-
2
%
VDDA = 3.0 V, TA = -10 to 105 °C
-4
-
2
%
-5.45
-
3.25
%
VDDA = 1.65 V to 3.6 V
TA = − 40 to 125 °C
tSU(HSI16)(2)
HSI16 oscillator
startup time
-
-
3.7
6
µs
IDD(HSI16)(2)
HSI16 oscillator
power consumption
-
-
100
140
µA
1. The trimming step differs depending on the trimming code. It is usually negative on the codes which are
multiples of 16 (0x00, 0x10, 0x20, 0x30...0xE0).
2. Guaranteed by characterization results.
3. Guaranteed by test in production.
Figure 20. HSI16 minimum and maximum value versus temperature
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DocID027099 Rev 4
75/119
106
Electrical characteristics
STM32L082xx
High-speed internal 48 MHz (HSI48) RC oscillator
Table 45. HSI48 oscillator characteristics(1)
Symbol
fHSI48
TRIM
Parameter
Conditions
Frequency
Min
Typ
Max
Unit
-
48
-
MHz
(2)
HSI48 user-trimming step
0.09
DuCy(HSI48) Duty cycle
0.14
(2)
%
(2)
%
0.2
(2)
-
55
-4(3)
-
4(3)
%
45
ACCHSI48
Accuracy of the HSI48
oscillator (factory calibrated
before CRS calibration)
tsu(HSI48)
HSI48 oscillator startup time
-
-
6(2)
µs
HSI48 oscillator power
consumption
-
330
380(2)
µA
IDDA(HSI48)
TA = 25 °C
1. VDDA = 3.3 V, TA = –40 to 125 °C unless otherwise specified.
2. Guaranteed by design.
3. Guaranteed by characterization results.
Low-speed internal (LSI) RC oscillator
Table 46. LSI oscillator characteristics
Symbol
fLSI(1)
DLSI(2)
tsu(LSI)(3)
IDD(LSI)
(3)
Parameter
Min
Typ
Max
Unit
LSI frequency
26
38
56
kHz
LSI oscillator frequency drift
0°C  TA  85°C
-10
-
4
%
LSI oscillator startup time
-
-
200
µs
LSI oscillator power consumption
-
400
510
nA
1. Guaranteed by test in production.
2. This is a deviation for an individual part, once the initial frequency has been measured.
3. Guaranteed by design.
Multi-speed internal (MSI) RC oscillator
Table 47. MSI oscillator characteristics
Symbol
fMSI
76/119
Parameter
Frequency after factory calibration, done at
VDD= 3.3 V and TA = 25 °C
DocID027099 Rev 4
Condition
Typ
Max Unit
MSI range 0
65.5
-
MSI range 1
131
-
MSI range 2
262
-
MSI range 3
524
-
MSI range 4
1.05
-
MSI range 5
2.1
-
MSI range 6
4.2
-
kHz
MHz
STM32L082xx
Electrical characteristics
Table 47. MSI oscillator characteristics (continued)
Symbol
ACCMSI
DTEMP(MSI)(1)
DVOLT(MSI)(1)
IDD(MSI)(2)
tSU(MSI)
Parameter
Condition
Typ
Frequency error after factory calibration
-
0.5
-
MSI oscillator frequency drift
0 °C  TA  85 °C
-
3
-
MSI range 0
− 8.9
+7.0
MSI range 1
− 7.1
+5.0
MSI range 2
− 6.4
+4.0
MSI range 3
− 6.2
+3.0
MSI range 4
− 5.2
+3.0
MSI range 5
− 4.8
+2.0
MSI range 6
− 4.7
+2.0
-
-
2.5
MSI range 0
0.75
-
MSI range 1
1
-
MSI range 2
1.5
-
MSI range 3
2.5
-
MSI range 4
4.5
-
MSI range 5
8
-
MSI range 6
15
-
MSI range 0
30
-
MSI range 1
20
-
MSI range 2
15
-
MSI range 3
10
-
MSI range 4
6
-
MSI range 5
5
-
MSI range 6,
Voltage range 1
and 2
3.5
-
MSI range 6,
Voltage range 3
5
-
MSI oscillator frequency drift
VDD = 3.3 V, − 40 °C  TA  110 °C
MSI oscillator frequency drift
1.65 V  VDD  3.6 V, TA = 25 °C
MSI oscillator power consumption
MSI oscillator startup time
DocID027099 Rev 4
Max Unit
%
%
%/V
µA
µs
77/119
106
Electrical characteristics
STM32L082xx
Table 47. MSI oscillator characteristics (continued)
Symbol
tSTAB(MSI)(2)
fOVER(MSI)
Parameter
Condition
MSI oscillator stabilization time
MSI oscillator frequency overshoot
Typ
Max Unit
MSI range 0
-
40
MSI range 1
-
20
MSI range 2
-
10
MSI range 3
-
4
MSI range 4
-
2.5
MSI range 5
-
2
MSI range 6,
Voltage range 1
and 2
-
2
MSI range 3,
Voltage range 3
-
3
Any range to
range 5
-
4
Any range to
range 6
-
µs
MHz
6
1. This is a deviation for an individual part, once the initial frequency has been measured.
2. Guaranteed by characterization results.
6.3.8
PLL characteristics
The parameters given in Table 48 are derived from tests performed under ambient
temperature and VDD supply voltage conditions summarized in Table 23.
Table 48. PLL characteristics
Value
Symbol
Parameter
Unit
Min
Typ
Max(1)
PLL input clock(2)
2
-
24
MHz
PLL input clock duty cycle
45
-
55
%
fPLL_OUT
PLL output clock
2
-
32
MHz
tLOCK
PLL input = 16 MHz
PLL VCO = 96 MHz
-
115
160
µs
Jitter
Cycle-to-cycle jitter
-
 600
ps
IDDA(PLL)
Current consumption on VDDA
-
220
450
IDD(PLL)
Current consumption on VDD
-
120
150
fPLL_IN
µA
1. Guaranteed by characterization results.
2. Take care of using the appropriate multiplier factors so as to have PLL input clock values compatible with
the range defined by fPLL_OUT.
78/119
DocID027099 Rev 4
STM32L082xx
6.3.9
Electrical characteristics
Memory characteristics
RAM memory
Table 49. RAM and hardware registers
Symbol
VRM
Parameter
Conditions
Data retention mode(1)
STOP mode (or RESET)
Min
Typ
Max
Unit
1.65
-
-
V
1. Minimum supply voltage without losing data stored in RAM (in Stop mode or under Reset) or in hardware
registers (only in Stop mode).
Flash memory and data EEPROM
Table 50. Flash memory and data EEPROM characteristics
Symbol
Conditions
Min
Typ
Max(1)
Unit
-
1.65
-
3.6
V
Erasing
-
3.28
3.94
Programming
-
3.28
3.94
Average current during
the whole programming /
erase operation
-
500
700
µA
Maximum current (peak) TA25 °C, VDD = 3.6 V
during the whole
programming / erase
operation
-
1.5
2.5
mA
Parameter
VDD
Operating voltage
Read / Write / Erase
tprog
Programming time for
word or half-page
IDD
ms
1. Guaranteed by design.
Table 51. Flash memory and data EEPROM endurance and retention
Value
Symbol
Parameter
Cycling (erase / write)
Program memory
NCYC(2)
Cycling (erase / write)
EEPROM data memory
Cycling (erase / write)
Program memory
Cycling (erase / write)
EEPROM data memory
Conditions
Min(1)
Unit
10
TA-40°C to 105 °C
100
kcycles
0.2
TA-40°C to 125 °C
DocID027099 Rev 4
2
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106
Electrical characteristics
STM32L082xx
Table 51. Flash memory and data EEPROM endurance and retention (continued)
Value
Symbol
Parameter
Data retention (program memory) after
10 kcycles at TA = 85 °C
Data retention (EEPROM data memory)
after 100 kcycles at TA = 85 °C
tRET(2)
Data retention (program memory) after
10 kcycles at TA = 105 °C
Data retention (EEPROM data memory)
after 100 kcycles at TA = 105 °C
Data retention (program memory) after
200 cycles at TA = 125 °C
Data retention (EEPROM data memory)
after 2 kcycles at TA = 125 °C
Conditions
Min(1)
Unit
30
TRET = +85 °C
30
TRET = +105 °C
years
10
TRET = +125 °C
1. Guaranteed by characterization results.
2. Characterization is done according to JEDEC JESD22-A117.
6.3.10
EMC characteristics
Susceptibility tests are performed on a sample basis during device characterization.
Functional EMS (electromagnetic susceptibility)
While a simple application is executed on the device (toggling 2 LEDs through I/O ports).
the device is stressed by two electromagnetic events until a failure occurs. The failure is
indicated by the LEDs:

Electrostatic discharge (ESD) (positive and negative) is applied to all device pins until
a functional disturbance occurs. This test is compliant with the IEC 61000-4-2 standard.

FTB: A Burst of Fast Transient voltage (positive and negative) is applied to VDD and
VSS through a 100 pF capacitor, until a functional disturbance occurs. This test is
compliant with the IEC 61000-4-4 standard.
A device reset allows normal operations to be resumed.
The test results are given in Table 52. They are based on the EMS levels and classes
defined in application note AN1709.
Table 52. EMS characteristics
Symbol
80/119
Parameter
Conditions
Level/
Class
VFESD
VDD 3.3 V, TA +25 °C, 
Voltage limits to be applied on any I/O pin to
fHCLK 32 MHz
induce a functional disturbance
conforms to IEC 61000-4-2
3B
VEFTB
Fast transient voltage burst limits to be
applied through 100 pF on VDD and VSS
pins to induce a functional disturbance
VDD3.3 V, TA +25 °C, 
fHCLK 32 MHz
conforms to IEC 61000-4-4
4A
DocID027099 Rev 4
STM32L082xx
Electrical characteristics
Designing hardened software to avoid noise problems
EMC characterization and optimization are performed at component level with a typical
application environment and simplified MCU software. It should be noted that good EMC
performance is highly dependent on the user application and the software in particular.
Therefore it is recommended that the user applies EMC software optimization and
prequalification tests in relation with the EMC level requested for his application.
Software recommendations
The software flowchart must include the management of runaway conditions such as:

Corrupted program counter

Unexpected reset

Critical data corruption (control registers...)
Prequalification trials
Most of the common failures (unexpected reset and program counter corruption) can be
reproduced by manually forcing a low state on the NRST pin or the oscillator pins for 1
second.
To complete these trials, ESD stress can be applied directly on the device, over the range of
specification values. When unexpected behavior is detected, the software can be hardened
to prevent unrecoverable errors occurring (see application note AN1015).
Electromagnetic Interference (EMI)
The electromagnetic field emitted by the device are monitored while a simple application is
executed (toggling 2 LEDs through the I/O ports). This emission test is compliant with
IEC 61967-2 standard which specifies the test board and the pin loading.
Table 53. EMI characteristics
Symbol Parameter
SEMI
Conditions
VDD 3.6 V,
Peak level TA 25 °C,
compliant with IEC 61967-2
DocID027099 Rev 4
Monitored
frequency band
Max vs.
frequency
range at
32 MHz
0.1 to 30 MHz
-7
30 to 130 MHz
14
130 MHz to 1 GHz
9
EMI Level
2
Unit
dBµV
-
81/119
106
Electrical characteristics
6.3.11
STM32L082xx
Electrical sensitivity characteristics
Based on three different tests (ESD, LU) using specific measurement methods, the device is
stressed in order to determine its performance in terms of electrical sensitivity.
Electrostatic discharge (ESD)
Electrostatic discharges (a positive then a negative pulse separated by 1 second) are
applied to the pins of each sample according to each pin combination. The sample size
depends on the number of supply pins in the device (3 parts × (n+1) supply pins). This test
conforms to the ANSI/JEDEC standard.
Table 54. ESD absolute maximum ratings
Symbol
VESD(HBM)
Ratings
Conditions
Class
Maximum
value(1)
2
2000
TA +25 °C,
Electrostatic discharge
conforming to
voltage (human body model)
ANSI/JEDEC JS-001
TA +25 °C,
conforming to
ANSI/ESD STM5.3.1.
Electrostatic discharge
VESD(CDM) voltage (charge device
model)
Unit
V
C4
500
1. Guaranteed by characterization results.
Static latch-up
Two complementary static tests are required on six parts to assess the latch-up
performance:

A supply overvoltage is applied to each power supply pin

A current injection is applied to each input, output and configurable I/O pin
These tests are compliant with EIA/JESD 78A IC latch-up standard.
Table 55. Electrical sensitivities
Symbol
LU
82/119
Parameter
Static latch-up class
Conditions
TA +125 °C conforming to JESD78A
DocID027099 Rev 4
Class
II level A
STM32L082xx
6.3.12
Electrical characteristics
I/O current injection characteristics
As a general rule, current injection to the I/O pins, due to external voltage below VSS or
above VDD (for standard pins) should be avoided during normal product operation.
However, in order to give an indication of the robustness of the microcontroller in cases
when abnormal injection accidentally happens, susceptibility tests are performed on a
sample basis during device characterization.
Functional susceptibility to I/O current injection
While a simple application is executed on the device, the device is stressed by injecting
current into the I/O pins programmed in floating input mode. While current is injected into
the I/O pin, one at a time, the device is checked for functional failures.
The failure is indicated by an out of range parameter: ADC error above a certain limit (higher
than 5 LSB TUE), out of conventional limits of induced leakage current on adjacent pins (out
of –5 µA/+0 µA range), or other functional failure (for example reset occurrence oscillator
frequency deviation).
The test results are given in the Table 56.
Table 56. I/O current injection susceptibility
Functional susceptibility
Symbol
IINJ
Description
Negative
injection
Positive
injection
Injected current on BOOT0
-0
NA
Injected current on PA0, PA4, PA5, PC15,
PH0 and PH1
-5
0
Injected current on any other FT, FTf pins
-5 (1)
NA
Injected current on any other pins
-5 (1)
+5
Unit
mA
1. It is recommended to add a Schottky diode (pin to ground) to analog pins which may potentially inject
negative currents.
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106
Electrical characteristics
6.3.13
STM32L082xx
I/O port characteristics
General input/output characteristics
Unless otherwise specified, the parameters given in Table 57 are derived from tests
performed under the conditions summarized in Table 23. All I/Os are CMOS and TTL
compliant.
Table 57. I/O static characteristics
Symbol
VIL
VIH
Vhys
Ilkg
RPU
Parameter
Input low level voltage
Input high level voltage
I/O Schmitt trigger voltage hysteresis
(2)
Input leakage current (4)
Weak pull-up equivalent resistor(5)
RPD
Weak pull-down equivalent resistor
CIO
I/O pin capacitance
(5)
Conditions
Min
Typ
Max
TC, FT, FTf, RST
I/Os
-
-
0.3VDD
BOOT0 pin
-
-
0.14VDD(1)
All I/Os
0.7 VDD
-
-
Standard I/Os
-
10% VDD(3)
-
BOOT0 pin
-
0.01
-
VSS VIN VDD
All I/Os except for
PA11, PA12, BOOT0
and FTf I/Os
-
-
±50
VSS VIN VDD,
PA11 and PA12 I/Os
-
-
-50/+250
VSS VIN VDD
FTf I/Os
-
-
±100
VDDVIN 5 V
All I/Os except for
PA11, PA12, BOOT0
and FTf I/Os
-
-
200
VDDVIN 5 V
FTf I/Os
-
-
500
VDDVIN 5 V
PA11, PA12 and
BOOT0
-
-
10
µA
VIN VSS
30
45
60
k
VIN VDD
30
45
60
k
-
-
5
-
pF
nA
2. Hysteresis voltage between Schmitt trigger switching levels. Guaranteed by characterization results.
3. With a minimum of 200 mV. Guaranteed by characterization results.
4. The max. value may be exceeded if negative current is injected on adjacent pins.
5. Pull-up and pull-down resistors are designed with a true resistance in series with a switchable PMOS/NMOS. This
MOS/NMOS contribution to the series resistance is minimum (~10% order).
DocID027099 Rev 4
V
nA
1. Guaranteed by characterization.
84/119
Unit
STM32L082xx
Electrical characteristics
Figure 21. VIH/VIL versus VDD (CMOS I/Os)
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9,/9,+9
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9
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Output driving current
The GPIOs (general purpose input/outputs) can sink or source up to ±8 mA, and sink or
source up to ±15 mA with the non-standard VOL/VOH specifications given in Table 58.
In the user application, the number of I/O pins which can drive current must be limited to
respect the absolute maximum rating specified in Section 6.2:

The sum of the currents sourced by all the I/Os on VDD, plus the maximum Run
consumption of the MCU sourced on VDD, cannot exceed the absolute maximum rating
IVDD(Σ) (see Table 21).

The sum of the currents sunk by all the I/Os on VSS plus the maximum Run
consumption of the MCU sunk on VSS cannot exceed the absolute maximum rating
IVSS(Σ) (see Table 21).
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106
Electrical characteristics
STM32L082xx
Output voltage levels
Unless otherwise specified, the parameters given in Table 58 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 23. All I/Os are CMOS and TTL compliant.
Table 58. Output voltage characteristics
Symbol
Parameter
VOL(1)
Output low level voltage for an I/O
pin
VOH(3)
Output high level voltage for an I/O
pin
Conditions
Min
Max
CMOS port(2),
IIO = +8 mA
2.7 V VDD  3.6 V
-
0.4
VDD-0.4
-
(1)
Output low level voltage for an I/O
pin
TTL port(2),
IIO =+ 8 mA
2.7 V VDD  3.6 V
-
0.4
(3)(4)
Output high level voltage for an I/O
pin
TTL port(2),
IIO = -6 mA
2.7 V VDD  3.6 V
2.4
-
VOL(1)(4)
Output low level voltage for an I/O
pin
IIO = +15 mA
2.7 V VDD  3.6 V
-
1.3
VOH(3)(4)
Output high level voltage for an I/O
pin
IIO = -15 mA
2.7 V VDD  3.6 V
VDD-1.3
-
VOL(1)(4)
Output low level voltage for an I/O
pin
IIO = +4 mA
1.65 V VDD < 3.6 V
-
0.45
VOH(3)(4)
Output high level voltage for an I/O
pin
IIO = -4 mA
V -0.45
1.65 V VDD  3.6 V DD
VOL
VOH
Output low level voltage for an FTf
VOLFM+(1)(4)
I/O pin in Fm+ mode
Unit
V
-
IIO = 20 mA
2.7 V VDD  3.6 V
-
0.4
IIO = 10 mA
1.65 V VDD  3.6 V
-
0.4
1. The IIO current sunk by the device must always respect the absolute maximum rating specified in Table 21.
The sum of the currents sunk by all the I/Os (I/O ports and control pins) must always be respected and
must not exceed ΣIIO(PIN).
2. TTL and CMOS outputs are compatible with JEDEC standards JESD36 and JESD52.
3. The IIO current sourced by the device must always respect the absolute maximum rating specified in
Table 21. The sum of the currents sourced by all the I/Os (I/O ports and control pins) must always be
respected and must not exceed ΣIIO(PIN).
4. Guaranteed by characterization results.
86/119
DocID027099 Rev 4
STM32L082xx
Electrical characteristics
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 23 and
Table 59, respectively.
Unless otherwise specified, the parameters given in Table 59 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 23.
Table 59. I/O AC characteristics(1)
OSPEEDRx[1:0]
bit value(1)
Symbol
fmax(IO)out
Maximum frequency(3)
tf(IO)out
tr(IO)out
Output rise and fall time
fmax(IO)out
Maximum frequency(3)
tf(IO)out
tr(IO)out
Output rise and fall time
00
01
Fmax(IO)out Maximum frequency(3)
10
tf(IO)out
tr(IO)out
Output rise and fall time
Fmax(IO)out Maximum frequency(3)
11
Fm+
configuration(4)
-
Min
Max(2)
CL = 50 pF, VDD = 2.7 V to 3.6 V
-
400
CL = 50 pF, VDD = 1.65 V to 2.7 V
-
100
CL = 50 pF, VDD = 2.7 V to 3.6 V
-
125
CL = 50 pF, VDD = 1.65 V to 2.7 V
-
320
CL = 50 pF, VDD = 2.7 V to 3.6 V
-
2
CL = 50 pF, VDD = 1.65 V to 2.7 V
-
0.6
CL = 50 pF, VDD = 2.7 V to 3.6 V
-
30
CL = 50 pF, VDD = 1.65 V to 2.7 V
-
65
CL = 50 pF, VDD = 2.7 V to 3.6 V
-
10
CL = 50 pF, VDD = 1.65 V to 2.7 V
-
2
CL = 50 pF, VDD = 2.7 V to 3.6 V
-
13
CL = 50 pF, VDD = 1.65 V to 2.7 V
-
28
CL = 30 pF, VDD = 2.7 V to 3.6 V
-
35
CL = 50 pF, VDD = 1.65 V to 2.7 V
-
10
CL = 30 pF, VDD = 2.7 V to 3.6 V
-
6
CL = 50 pF, VDD = 1.65 V to 2.7 V
-
17
-
1
-
10
Parameter
tf(IO)out
tr(IO)out
Output rise and fall time
fmax(IO)out
Maximum frequency(3)
Conditions
tf(IO)out
Output fall time
tr(IO)out
Output rise time
-
30
Maximum frequency(3)
-
350
-
15
-
60
8
-
fmax(IO)out
tf(IO)out
Output fall time
tr(IO)out
Output rise time
tEXTIpw
Pulse width of external
signals detected by the
EXTI controller
CL = 50 pF, VDD = 2.5 V to 3.6 V
CL = 50 pF, VDD = 1.65 V to 3.6 V
-
Unit
kHz
ns
MHz
ns
MHz
ns
MHz
ns
MHz
ns
KHz
ns
ns
1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the line reference manual for a description of GPIO Port
configuration register.
2. Guaranteed by design.
3. The maximum frequency is defined in Figure 23.
4. When Fm+ configuration is set, the I/O speed control is bypassed. Refer to the line reference manual for a detailed
description of Fm+ I/O configuration.
DocID027099 Rev 4
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106
Electrical characteristics
STM32L082xx
Figure 23. I/O AC characteristics definition
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6.3.14
DLG
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU , except when it is internally driven low (see Table 60).
Unless otherwise specified, the parameters given in Table 60 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 23.
Table 60. NRST pin characteristics
Symbol
VIL(NRST)
(1)
Parameter
Conditions
Min
Typ
NRST input low level voltage
-
VSS
-
0.8
-
1.4
-
VDD
IOL = 2 mA
2.7 V < VDD < 3.6 V
-
-
IOL = 1.5 mA
1.65 V < VDD < 2.7 V
-
-
-
-
10%VDD(2)
-
mV
Weak pull-up equivalent
resistor(3)
VIN VSS
30
45
60
k
NRST input filtered pulse
-
-
-
50
ns
NRST input not filtered pulse
-
350
-
-
ns
VIH(NRST)(1) NRST input high level voltage
NRST output low level
VOL(NRST)(1)
voltage
Vhys(NRST)(1)
RPU
VF(NRST)(1)
VNF(NRST)
(1)
NRST Schmitt trigger voltage
hysteresis
Max Unit
V
0.4
1. Guaranteed by design.
2. 200 mV minimum value
3. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to
the series resistance is around 10%.
88/119
DocID027099 Rev 4
STM32L082xx
Electrical characteristics
Figure 24. Recommended NRST pin protection
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DLF
1. The reset network protects the device against parasitic resets.
2. The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in
Table 60. Otherwise the reset will not be taken into account by the device.
6.3.15
12-bit ADC characteristics
Unless otherwise specified, the parameters given in Table 61 are derived from tests
performed under ambient temperature, fPCLK frequency and VDDA supply voltage conditions
summarized in Table 23: General operating conditions.
Note:
It is recommended to perform a calibration after each power-up.
Table 61. ADC characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDDA
Analog supply voltage for
ADC on
Fast channel
1.65
-
3.6
Standard channel
1.75(1)
-
3.6
VREF+
Positive reference voltage
-
1.65
Current consumption of the
ADC on VDDA and VREF+
1.14 Msps
-
200
-
10 ksps
-
40
-
Current consumption of the
ADC on VDD(2)
1.14 Msps
-
70
-
10 ksps
-
1
-
Voltage scaling Range 1
0.14
-
16
Voltage scaling Range 2
0.14
-
8
Voltage scaling Range 3
0.14
-
4
Sampling rate
12-bit resolution
0.01
-
1.14
MHz
External trigger frequency
fADC = 16 MHz,
12-bit resolution
-
-
941
kHz
-
-
-
17
1/fADC
IDDA (ADC)
fADC
fS(3)
fTRIG(3)
ADC clock frequency
VDDA
V
V
µA
MHz
VAIN
Conversion voltage range
-
0
-
VREF+
V
RAIN(3)
External input impedance
See Equation 1 and
Table 62 for details
-
-
50
k
-
-
-
1
k
RADC(3)(4)
Sampling switch resistance
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106
Electrical characteristics
STM32L082xx
Table 61. ADC characteristics (continued)
Symbol
Parameter
CADC(3)
Internal sample and hold
capacitor
tCAL(3)(5)
Calibration time
Conditions
Min
Typ
Max
Unit
-
-
-
8
pF
fADC = 16 MHz
5.2
µs
-
83
1/fADC
1.5 ADC
cycles + 2
fPCLK cycles
-
1.5 ADC
cycles + 3
fPCLK cycles
-
ADC clock = PCLK/2
-
4.5
-
fPCLK
cycle
ADC clock = PCLK/4
-
8.5
-
fPCLK
cycle
ADC clock = HSI16
WLATENCY(6)
tlatr(3)
JitterADC
tS(3)
tUP_LDO(3)(5)
tSTAB(3)(5)
tConV(3)
ADC_DR register write
latency
Trigger conversion latency
fADC = fPCLK/2 = 16 MHz
0.266
µs
fADC = fPCLK/2
8.5
1/fPCLK
fADC = fPCLK/4 = 8 MHz
0.516
µs
fADC = fPCLK/4
16.5
1/fPCLK
fADC = fHSI16 = 16 MHz
0.252
-
0.260
µs
fADC = fHSI16
-
1
-
1/fHSI16
fADC = 16 MHz
0.093
-
10.03
µs
-
1.5
-
160.5
1/fADC
Internal LDO power-up time
-
-
-
10
µs
ADC stabilization time
-
ADC jitter on trigger
conversion
Sampling time
Total conversion time
(including sampling time)
fADC = 16 MHz,
12-bit resolution
12-bit resolution
14
0.875
-
1/fADC
10.81
14 to 173 (tS for sampling +12.5
for successive approximation)
µs
1/fADC
1. VDDA minimum value can be decreased in specific temperature conditions. Refer to Table 62: RAIN max for fADC = 16 MHz.
2. A current consumption proportional to the APB clock frequency has to be added (see Table 37: Peripheral current
consumption in Run or Sleep mode).
3. Guaranteed by design.
4. Standard channels have an extra protection resistance which depends on supply voltage. Refer to Table 62: RAIN max for
fADC = 16 MHz.
5. This parameter only includes the ADC timing. It does not take into account register access latency.
6. This parameter specifies the latency to transfer the conversion result into the ADC_DR register. EOC bit is set to indicate the
conversion is complete and has the same latency.
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STM32L082xx
Electrical characteristics
Equation 1: RAIN max formula
TS
- – R ADC
R AIN  ------------------------------------------------------------N+2
f ADC  C ADC  ln  2

The simplified formula above (Equation 1) is used to determine the maximum external
impedance allowed for an error below 1/4 of LSB. Here N = 12 (from 12-bit resolution).
Table 62. RAIN max for fADC = 16 MHz(1)
Ts
(cycles)
tS
(µs)
RAIN max for
fast channels
(k)
1.5
0.09
3.5
RAIN max for standard channels (k)
VDD > 1.65 V VDD > 1.65 V
and
and
TA > 10 °C
TA > 25 °C
VDD >
2.7 V
VDD >
2.4 V
VDD >
2.0 V
VDD >
1.8 V
VDD >
1.75 V
0.5
< 0.1
NA
NA
NA
NA
NA
NA
0.22
1
0.2
< 0.1
NA
NA
NA
NA
NA
7.5
0.47
2.5
1.7
1.5
< 0.1
NA
NA
NA
NA
12.5
0.78
4
3.2
3
1
NA
NA
NA
NA
19.5
1.22
6.5
5.7
5.5
3.5
NA
NA
NA
< 0.1
39.5
2.47
13
12.2
12
10
NA
NA
NA
5
79.5
4.97
27
26.2
26
24
< 0.1
NA
NA
19
160.5
10.03
50
49.2
49
47
32
< 0.1
< 0.1
42
1. Guaranteed by design.
Table 63. ADC accuracy(1)(2)(3)
Symbol
Parameter
Conditions
Min
Typ
Max
ET
Total unadjusted error
-
2
4
EO
Offset error
-
1
2.5
EG
Gain error
-
1
2
EL
Integral linearity error
-
1.5
2.5
ED
Differential linearity error
-
1
1.5
10.2
11
11.3
12.1
-
Effective number of bits
1.65 V < VDDA = VREF+ < 3.6 V,
range 1/2/3
ENOB
Effective number of bits (16-bit mode
oversampling with ratio =256)(4)
SINAD
Signal-to-noise distortion
63
69
-
Signal-to-noise ratio
63
69
-
SNR
Signal-to-noise ratio (16-bit mode
oversampling with ratio =256)(4)
70
76
-
THD
Total harmonic distortion
-
-85
-73
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dB
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STM32L082xx
Table 63. ADC accuracy(1)(2)(3) (continued)
Symbol
Parameter
Conditions
Min
Typ
Max
ET
Total unadjusted error
-
2
5
EO
Offset error
-
1
2.5
EG
Gain error
-
1
2
EL
Integral linearity error
-
1.5
3
-
1
2
1.65 V < VREF+ <VDDA < 3.6 V,
range 1/2/3
ED
Differential linearity error
ENOB
Effective number of bits
10.0
11.0
-
SINAD
Signal-to-noise distortion
62
69
-
SNR
Signal-to-noise ratio
61
69
-
THD
Total harmonic distortion
-
-85
-65
Unit
LSB
bits
dB
1. ADC DC accuracy values are measured after internal calibration.
2. ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non-robust) analog input
pins should be avoided as this significantly reduces the accuracy of the conversion being performed on another analog
input. It is recommended to add a Schottky diode (pin to ground) to standard analog pins which may potentially inject
negative current. 
Any positive injection current within the limits specified for IINJ(PIN) and IINJ(PIN) in Section 6.3.12 does not affect the ADC
accuracy.
3. Better performance may be achieved in restricted VDDA, frequency and temperature ranges.
4. This number is obtained by the test board without additional noise, resulting in non-optimized value for oversampling mode.
Figure 25. ADC accuracy characteristics
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Electrical characteristics
Figure 26. Typical connection diagram using the ADC
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1. Refer to Table 61: ADC characteristics for the values of RAIN, RADC and CADC.
2. Cparasitic represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the
pad capacitance (roughly 7 pF). A high Cparasitic value will downgrade conversion accuracy. To remedy
this, fADC should be reduced.
General PCB design guidelines
Power supply decoupling should be performed as shown in Figure 27 or Figure 28,
depending on whether VREF+ is connected to VDDA or not. The 10 nF capacitors should be
ceramic (good quality). They should be placed as close as possible to the chip.
Figure 27. Power supply and reference decoupling (VREF+ not connected to VDDA)
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106
Electrical characteristics
STM32L082xx
Figure 28. Power supply and reference decoupling (VREF+ connected to VDDA)
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STM32L082xx
6.3.16
Electrical characteristics
DAC electrical specifications
Data guaranteed by design, not tested in production, unless otherwise specified.
Table 64. DAC characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDDA
Analog supply voltage
-
1.8
-
3.6
V
VREF+
Reference supply voltage
VREF+ must always be
below VDDA
1.8
-
3.6
V
VREF-
Lower reference voltage
-
IDDVREF+(1)
No load, middle code
Current consumption on VREF+ (0x800)
supply
No load, worst code
VREF+ = 3.3 V
(0x000)
IDDA (2)
RL(3)
CL
(3)
RO
VDAC_OUT
DNL(2)
INL(2)
Offset(2)
Offset1(2)
Current consumption on VDDA
supply, 
VDDA = 3.3 V
Resistive load
Capacitive load
Output impedance
VSSA
-
130
V
220
µA
-
220
350
No load, middle code
(0x800)
-
210
320
No load, worst code
(0xF1C)
-
320
520
5
-
-
k
-
-
50
pF
DAC output buffer off
12
16
20
k
DAC output buffer ON
0.2
-
VDDA – 0.2
V
DAC output buffer OFF
0.5
-
VREF+ –
1LSB
mV
CL  50 pF, RL  5 k
DAC output buffer on
-
1.5
3
No RLOAD, CL  50 pF
DAC output buffer off
-
1.5
3
CL  50 pF, RL  5 k
DAC output buffer on
-
2
4
No RLOAD, CL  50 pF
DAC output buffer off
-
2
4
CL  50 pF, RL  5 k
DAC output buffer on
-
±10
±25
No RLOAD, CL  50 pF
DAC output buffer off
-
±5
±8
No RLOAD, CL  50 pF
DAC output buffer off
-
±1.5
±5
DAC output buffer on
µA
Voltage on DAC_OUT output
Differential non linearity(4)
Integral non linearity(5)
Offset error at code 0x800 (6)
Offset error at code 0x001(7)
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STM32L082xx
Table 64. DAC characteristics (continued)
Symbol
Min
Typ
Max
VDDA 3.3V
VREF+3.0 V
TA = 0 to 50 C
DAC output buffer off
-20
-10
0
VDDA 3.3V
VREF+3.0 V
TA = 0 to 50 C
DAC output buffer on
0
CL  50 pF, RL  5 k
DAC output buffer on
-
No RLOAD, CL  50 pF
DAC output buffer off
-
+0 / -0.2%
+0 / -0.4%
VDDA 3.3V
VREF+3.0 V
TA = 0 to 50 C
DAC output buffer off
-10
-2
0
VDDA 3.3V
VREF+3.0 V
TA = 0 to 50 C
DAC output buffer on
-40
-8
0
CL  50 pF, RL  5 k
DAC output buffer on
-
12
30
No RLOAD, CL  50 pF
DAC output buffer off
-
8
12
tSETTLING
Settling time (full scale: for a
12-bit code transition between
the lowest and the highest
input codes till DAC_OUT
reaches final value ±1LSB
CL  50 pF, RL  5 k
-
7
12
µs
Update rate
Max frequency for a correct
DAC_OUT change (95% of
final value) with 1 LSB
variation in the input code
CL  50 pF, RL  5 k
-
-
1
Msps
tWAKEUP
Wakeup time from off state
(setting the ENx bit in the DAC CL  50 pF, RL  5 k
Control register)(9)
-
9
15
µs
PSRR+
VDDA supply rejection ratio
(static DC measurement)
-
-60
-35
dB
dOffset/dT(2)
Gain(2)
dGain/dT(2)
TUE(2)
Parameter
Offset error temperature
coefficient (code 0x800)
Gain error(8)
Gain error temperature
coefficient
Total unadjusted error
Conditions
CL  50 pF, RL  5 k
µV/°C
20
50
+0.1 / -0.2% +0.2 / -0.5%
%
µV/°C
LSB
1. Guaranteed by characterization results.
2. Guaranteed by design, not tested in production.
3. Connected between DAC_OUT and VSSA.
4. Difference between two consecutive codes - 1 LSB.
5. Difference between measured value at Code i and the value at Code i on a line drawn between Code 0 and last Code
4095.
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STM32L082xx
Electrical characteristics
6. Difference between the value measured at Code (0x800) and the ideal value = VREF+/2.
7. Difference between the value measured at Code (0x001) and the ideal value.
8. Difference between ideal slope of the transfer function and measured slope computed from code 0x000 and 0xFFF when
buffer is off, and from code giving 0.2 V and (VDDA – 0.2) V when buffer is on.
9. In buffered mode, the output can overshoot above the final value for low input code (starting from min value).
Figure 29. 12-bit buffered/non-buffered DAC
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6.3.17
Temperature sensor characteristics
Table 65. Temperature sensor calibration values
Calibration value name
Description
Memory address
TS_CAL1
TS ADC raw data acquired at
temperature of 30 °C, VDDA= 3 V
TS_CAL2
TS ADC raw data acquired at
0x1FF8 007E - 0x1FF8 007F
temperature of 130 °C, VDDA= 3 V
0x1FF8 007A - 0x1FF8 007B
Table 66. Temperature sensor characteristics
Symbol
Min
Typ
Max
Unit
-
1
2
°C
Average slope
1.48
1.61
1.75
mV/°C
V130
Voltage at 130°C ±5°C(2)
640
670
700
mV
I
µA
TL(1)
Avg_Slope
Parameter
VSENSE linearity with temperature
(1)
Current consumption
-
3.4
6
tSTART(3)
Startup time
-
-
10
TS_temp(4)(3)
ADC sampling time when reading the temperature
10
-
-
(3)
DDA(TEMP)
µs
1. Guaranteed by characterization results.
2. Measured at VDD = 3 V ±10 mV. V130 ADC conversion result is stored in the TS_CAL2 byte.
3. Guaranteed by design.
4. Shortest sampling time can be determined in the application by multiple iterations.
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Electrical characteristics
6.3.18
STM32L082xx
Comparators
Table 67. Comparator 1 characteristics
Symbol
Parameter
Conditions
Min(1)
Typ
Max(1)
Unit
3.6
V
VDDA
Analog supply voltage
-
1.65
R400K
R400K value
-
-
400
-
R10K
R10K value
-
-
10
-
Comparator 1 input voltage
range
-
0.6
-
VDDA
Comparator startup time
-
-
7
10
-
-
3
10
-
-
3
10
mV
Comparator offset variation in VDDA 3.6 V, VIN+ 0 V,
worst voltage stress conditions VIN- VREFINT, TA = 25 C
0
1.5
10
mV/1000 h
Current consumption(3)
-
160
260
nA
VIN
tSTART
td
Propagation
Voffset
dVoffset/dt
ICOMP1
delay(2)
Comparator offset
-
k
V
µs
1. Guaranteed by characterization.
2. The delay is characterized for 100 mV input step with 10 mV overdrive on the inverting input, the non-inverting input set to
the reference.
3. Comparator consumption only. Internal reference voltage not included.
Table 68. Comparator 2 characteristics
Symbol
VDDA
VIN
Conditions
Min
Typ
Max(1)
Unit
Analog supply voltage
-
1.65
-
3.6
V
Comparator 2 input voltage range
-
0
-
VDDA
V
Fast mode
-
15
20
Slow mode
-
20
25
1.65 V  VDDA  2.7 V
-
1.8
3.5
2.7 V  VDDA  3.6 V
-
2.5
6
1.65 V  VDDA  2.7 V
-
0.8
2
2.7 V  VDDA  3.6 V
-
1.2
4
-
4
20
mV
VDDA 3.3V, TA = 0 to 50 C, 
V- = VREFINT,
3/4 VREFINT,
1/2 VREFINT,
1/4 VREFINT.
-
15
30
ppm
/°C
Fast mode
-
3.5
5
Slow mode
-
0.5
2
Parameter
tSTART
Comparator startup time
td slow
Propagation delay(2) in slow mode
td fast
Propagation delay(2) in fast mode
Voffset
Comparator offset error
dThreshold/
dt
ICOMP2
Threshold voltage temperature
coefficient
Current consumption(3)
µs
µA
1. Guaranteed by characterization results.
2. The delay is characterized for 100 mV input step with 10 mV overdrive on the inverting input, the non-inverting input set to
the reference.
3. Comparator consumption only. Internal reference voltage (required for comparator operation) is not included.
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6.3.19
Electrical characteristics
Timer characteristics
TIM timer characteristics
The parameters given in the Table 69 are guaranteed by design.
Refer to Section 6.3.13: I/O port characteristics for details on the input/output alternate
function characteristics (output compare, input capture, external clock, PWM output).
Table 69. TIMx characteristics(1)
Symbol
Parameter
tres(TIM)
Conditions
Timer resolution time
fTIMxCLK = 32 MHz
Timer external clock frequency on CH1
to CH4
fEXT
ResTIM
tCOUNTER
Max
Unit
1
-
tTIMxCLK
31.25
-
ns
0
fTIMxCLK/2
MHz
0
16
MHz
16
bit
65536
tTIMxCLK
2048
µs
fTIMxCLK = 32 MHz
Timer resolution
-
16-bit counter clock period when
internal clock is selected (timer’s
prescaler disabled)
-
tMAX_COUNT Maximum possible count
Min
1
fTIMxCLK = 32 MHz 0.0312
-
-
65536 × 65536
tTIMxCLK
fTIMxCLK = 32 MHz
-
134.2
s
1. TIMx is used as a general term to refer to the TIM2, TIM6, TIM21, and TIM22 timers.
6.3.20
Communications interfaces
I2C interface characteristics
The I2C interface meets the timings requirements of the I2C-bus specification and user
manual rev. 03 for:

Standard-mode (Sm) : with a bit rate up to 100 kbit/s

Fast-mode (Fm) : with a bit rate up to 400 kbit/s

Fast-mode Plus (Fm+) : with a bit rate up to 1 Mbit/s.
The I2C timing requirements are guaranteed by design when the I2C peripheral is properly
configured (refer to the reference manual for details). The SDA and SCL I/O requirements
are met with the following restrictions: the SDA and SCL I/O pins are not "true" open-drain.
When configured as open-drain, the PMOS connected between the I/O pin and VDDIOx is
disabled, but is still present. Only FTf I/O pins support Fm+ low level output current
maximum requirement (refer to Section 6.3.13: I/O port characteristics for the I2C I/Os
characteristics).
All I2C SDA and SCL I/Os embed an analog filter (see Table 70 for the analog filter
characteristics).
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STM32L082xx
The analog spike filter is compliant with I2C timings requirements only for the following
voltage ranges:

Fast mode Plus: 2.7 V VDD 3.6 V and voltage scaling Range 1

Fast mode:
–
2 V  VDD  3.6 V and voltage scaling Range 1 or Range 2.
–
VDD < 2 V, voltage scaling Range 1 or Range 2, Cload < 200 pF.
In other ranges, the analog filter should be disabled. The digital filter can be used instead.
Note:
In Standard mode, no spike filter is required.
Table 70. I2C analog filter characteristics(1)
Symbol
Parameter
Conditions
Min
tAF
Range 2
Unit
100(3)
Range 1
Maximum pulse width of spikes that
are suppressed by the analog filter
Max
50(2)
Range 3
-
ns
-
1. Guaranteed by characterization results.
2. Spikes with widths below tAF(min) are filtered.
3. Spikes with widths above tAF(max) are not filtered
USART/LPUART characteristics
The parameters given in the following table are guaranteed by design.
Table 71. USART/LPUART characteristics
Symbol
tWUUSART
100/119
Parameter
Wakeup time needed to
calculate the maximum
USART/LPUART baudrate
allowing to wake up from
Stop mode
Conditions
Typ
Max
Stop mode with main regulator in
Run mode, Range 2 or 3
-
8.7
Stop mode with main regulator in
Run mode, Range 1
-
8.1
Unit
µs
Stop mode with main regulator in
low-power mode, Range 2 or 3
-
12
Stop mode with main regulator in
low-power mode, Range 1
-
11.4
DocID027099 Rev 4
STM32L082xx
Electrical characteristics
SPI characteristics
Unless otherwise specified, the parameters given in the following tables are derived from
tests performed under ambient temperature, fPCLKx frequency and VDD supply voltage
conditions summarized in Table 23.
Refer to Section 6.3.12: I/O current injection characteristics for more details on the
input/output alternate function characteristics (NSS, SCK, MOSI, MISO).
Table 72. SPI characteristics in voltage Range 1 (1)
Symbol
Parameter
Conditions
Min
Typ
-
-
Slave mode
Transmitter
1.71<VDD<3.6V
-
-
12(2)
Slave mode
Transmitter
2.7<VDD<3.6V
-
-
16(2)
Master mode
Slave mode
receiver
fSCK
1/tc(SCK)
SPI clock frequency
Max
16
16
Duty(SCK)
Duty cycle of SPI clock
frequency
Slave mode
30
50
70
tsu(NSS)
NSS setup time
Slave mode, SPI
presc = 2
4*Tpclk
-
-
th(NSS)
NSS hold time
Slave mode, SPI
presc = 2
2*Tpclk
-
-
tw(SCKH)
tw(SCKL)
SCK high and low time
Master mode
Tpclk-2
Tpclk
Tpclk+
2
Master mode
0
-
-
Slave mode
3
-
-
Master mode
7
-
-
Slave mode
3.5
-
-
tsu(MI)
tsu(SI)
th(MI)
th(SI)
Data input setup time
Data input hold time
ta(SO
Data output access time
Slave mode
15
-
36
tdis(SO)
Data output disable time
Slave mode
10
-
30
Slave mode
1.65 V<VDD<3.6 V
-
18
41
Slave mode
2.7 V<VDD<3.6 V
-
18
25
Master mode
-
4
7
Slave mode
10
-
-
Master mode
0
-
-
tv(SO)
Data output valid time
tv(MO)
th(SO)
th(MO)
Data output hold time
Unit
MHz
%
ns
1. Guaranteed by characterization results.
2. The maximum SPI clock frequency in slave transmitter mode is determined by the sum of tv(SO) and tsu(MI)
which has to fit into SCK low or high phase preceding the SCK sampling edge. This value can be
achieved when the SPI communicates with a master having tsu(MI) = 0 while Duty(SCK) = 50%.
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STM32L082xx
Table 73. SPI characteristics in voltage Range 2 (1)
Symbol
Parameter
Conditions
Min
Typ
Master mode
fSCK
1/tc(SCK)
SPI clock frequency
Slave mode Transmitter
1.65<VDD<3.6V
Max
8
-
-
Slave mode Transmitter
2.7<VDD<3.6V
8
Duty cycle of SPI clock
frequency
Slave mode
30
50
70
tsu(NSS)
NSS setup time
Slave mode, SPI presc = 2
4*Tpclk
-
-
th(NSS)
NSS hold time
Slave mode, SPI presc = 2
2*Tpclk
-
-
tw(SCKH)
tw(SCKL)
SCK high and low time
Master mode
Tpclk-2
Tpclk
Tpclk+2
Master mode
0
-
-
Slave mode
3
-
-
Master mode
11
-
-
Slave mode
4.5
-
-
tsu(SI)
th(MI)
th(SI)
Data input setup time
Data input hold time
ta(SO
Data output access time
Slave mode
18
-
52
tdis(SO)
Data output disable time
Slave mode
12
-
42
Slave mode
-
20
56.5
Master mode
-
5
9
Slave mode
13
-
-
Master mode
3
-
-
tv(SO)
Data output valid time
tv(MO)
th(SO)
th(MO)
Data output hold time
MHz
8(2)
Duty(SCK)
tsu(MI)
Unit
%
ns
1. Guaranteed by characterization results.
2. The maximum SPI clock frequency in slave transmitter mode is determined by the sum of tv(SO) and tsu(MI) which has to fit
into SCK low or high phase preceding the SCK sampling edge. This value can be achieved when the SPI communicates
with a master having tsu(MI) = 0 while Duty(SCK) = 50%.
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Electrical characteristics
Table 74. SPI characteristics in voltage Range 3 (1)
Symbol
Parameter
Min
Typ
fSCK
1/tc(SCK)
SPI clock frequency
-
-
Duty(SCK)
Duty cycle of SPI clock
frequency
Slave mode
30
50
70
tsu(NSS)
NSS setup time
Slave mode, SPI presc = 2
4*Tpclk
-
-
th(NSS)
NSS hold time
Slave mode, SPI presc = 2
2*Tpclk
-
-
tw(SCKH)
tw(SCKL)
SCK high and low time
Master mode
Tpclk-2
Tpclk
Tpclk+2
Master mode
1.5
-
-
Slave mode
6
-
-
Master mode
13.5
-
-
Slave mode
16
-
-
tsu(MI)
Conditions
Data input setup time
tsu(SI)
th(MI)
Data input hold time
th(SI)
Master mode
Slave mode
Max
2
2(2)
ta(SO
Data output access time
Slave mode
30
-
70
tdis(SO)
Data output disable time
Slave mode
40
-
80
Slave mode
-
30
70
Master mode
-
7
9
Slave mode
25
-
-
Master mode
8
-
-
tv(SO)
Data output valid time
tv(MO)
th(SO)
Data output hold time
th(MO)
Unit
MHz
%
ns
1. Guaranteed by characterization results.
2. The maximum SPI clock frequency in slave transmitter mode is determined by the sum of tv(SO) and tsu(MI) which has to fit
into SCK low or high phase preceding the SCK sampling edge. This value can be achieved when the SPI communicates
with a master having tsu(MI) = 0 while Duty(SCK) = 50%.
Figure 30. SPI timing diagram - slave mode and CPHA = 0
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Electrical characteristics
STM32L082xx
Figure 31. SPI timing diagram - slave mode and CPHA = 1(1)
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Figure 32. SPI timing diagram - master mode(1)
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1. Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD.
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Electrical characteristics
USB characteristics
The USB interface is USB-IF certified (full speed).
Table 75. USB startup time
Symbol
tSTARTUP
(1)
Parameter
USB transceiver startup time
Max
Unit
1
µs
1. Guaranteed by design.
Table 76. USB DC electrical characteristics
Symbol
Parameter
Conditions
Min.(1)
Max.(1)
Unit
-
3.0
3.6
V
0.2
-
Input levels
VDD
USB operating voltage
VDI(2)
Differential input sensitivity
VCM(2)
Differential common mode range Includes VDI range
0.8
2.5
VSE(2)
Single ended receiver threshold
1.3
2.0
-
0.3
2.8
3.6
I(USB_DP, USB_DM)
-
V
Output levels
VOL(3)
VOH
(3)
Static output level low
Static output level high
RL of 1.5 k to 3.6 V(4)
RL of 15 k to
VSS(4)
V
1. All the voltages are measured from the local ground potential.
2. Guaranteed by characterization results.
3. Guaranteed by test in production.
4. RL is the load connected on the USB drivers.
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Electrical characteristics
STM32L082xx
Figure 33. USB timings: definition of data signal rise and fall time
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Table 77. USB: full speed electrical characteristics
Driver characteristics(1)
Symbol
Parameter
Conditions
Min
Max
Unit
tr
Rise time(2)
CL = 50 pF
4
20
ns
tf
Time(2)
CL = 50 pF
4
20
ns
tr/tf
90
110
%
1.3
2.0
V
trfm
VCRS
Fall
Rise/ fall time matching
Output signal crossover voltage
1. Guaranteed by design.
2. Measured from 10% to 90% of the data signal. For more detailed informations, please refer to USB
Specification - Chapter 7 (version 2.0).
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7
Package information
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at www.st.com.
ECOPACK® is an ST trademark.
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Package information
7.1
STM32L082xx
WLCSP49 package information
Figure 34. WLCSP49 - 49-pin, 3.294 x 3.258 mm, 0.4 mm pitch wafer level chip scale
package outline
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1. Drawing is not to scale.
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Package information
Table 78. WLCSP49 - 49-pin, 3.294 x 3.258 mm, 0.4 mm pitch wafer level chip scale
package mechanical data
inches(1)
millimeters
Symbol
Min
Typ
Max
Min
Typ
Max
A
0.525
0.555
0.585
0.0207
0.0219
0.0230
A1
-
0.175
-
-
0.0069
-
A2
-
0.380
-
-
0.0150
-
-
0.025
-
-
0.0010
-
b(3)
0.220
0.250
0.280
0.0087
0.0098
0.0110
D
3.259
3.294
3.329
0.1283
0.1297
0.1311
E
3.223
3.258
3.293
0.1269
0.1283
0.1296
e
-
0.400
-
-
0.0157
-
e1
-
2.400
-
-
0.0945
-
e2
-
2.400
-
-
0.0945
-
F
-
0.447
-
-
0.0176
-
G
-
0.429
-
-
0.0169
-
aaa
-
-
0.100
-
-
0.0039
bbb
-
-
0.100
-
-
0.0039
ccc
-
-
0.100
-
-
0.0039
ddd
-
-
0.050
-
-
0.0020
eee
-
-
0.050
-
-
0.0020
A3
(2)
1. Values in inches are converted from mm and rounded to 4 decimal digits.
2. Back side coating
3. Dimension is measured at the maximum bump diameter parallel to primary datum Z.
Figure 35. WLCSP49 - 49-pin, 3.294 x 3.258 mm, 0.4 mm pitch wafer level chip scale
recommended footprint
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Package information
STM32L082xx
Table 79. WLCSP49 recommended PCB design rules (0.4 mm pitch)
Dimension
Recommended values
Pitch
0.4
Dpad
110/119
260 µm max. (circular)
220 µm recommended
Dsm
300 µm min. (for 260 µm diameter pad)
PCB pad design
Non-solder mask defined via underbump allowed.
DocID027099 Rev 4
STM32L082xx
LQFP32 package information
Figure 36. LQFP32 - 32-pin, 7 x 7 mm low-profile quad flat package outline
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Package information
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1. Drawing is not to scale.
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Package information
STM32L082xx
Table 80. LQFP32 - 32-pin, 7 x 7 mm low-profile quad flat package mechanical data
inches(1)
millimeters
Symbol
Min
Typ
Max
Min
Typ
Max
A
-
-
1.600
-
-
0.0630
A1
0.050
-
0.150
0.0020
-
0.0059
A2
1.350
1.400
1.450
0.0531
0.0551
0.0571
b
0.300
0.370
0.450
0.0118
0.0146
0.0177
c
0.090
-
0.200
0.0035
-
0.0079
D
8.800
9.000
9.200
0.3465
0.3543
0.3622
D1
6.800
7.000
7.200
0.2677
0.2756
0.2835
D3
-
5.600
-
-
0.2205
-
E
8.800
9.000
9.200
0.3465
0.3543
0.3622
E1
6.800
7.000
7.200
0.2677
0.2756
0.2835
E3
-
5.600
-
-
0.2205
-
e
-
0.800
-
-
0.0315
-
L
0.450
0.600
0.750
0.0177
0.0236
0.0295
L1
-
1.000
-
-
0.0394
-
k
0°
3.5°
7°
0°
3.5°
7°
ccc
-
-
0.100
-
-
0.0039
1. Values in inches are converted from mm and rounded to 4 decimal digits.
Figure 37. LQFP32 - 32-pin, 7 x 7 mm low-profile quad flat recommended footprint
1. Dimensions are expressed in millimeters.
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7.3
Package information
UFQFPN32 package information
Figure 38. UFQFPN32 - 32-pin, 5x5 mm, 0.5 mm pitch ultra thin fine pitch quad flat
package outline
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Package information
STM32L082xx
Table 81. UFQFPN32 - 32-pin, 5x5 mm, 0.5 mm pitch ultra thin fine pitch quad flat
package mechanical data
inches(1)
millimeters
Symbol
Min
Typ
Max
Min
Typ
Max
A
0.500
0.550
0.600
0.0197
0.0217
0.0236
A1
0.000
0.020
0.050
0.0000
0.0008
0.0020
A3
-
0.152
-
-
0.0060
-
b
0.180
0.230
0.280
0.0071
0.0091
0.0110
D
4.900
5.000
5.100
0.1929
0.1969
0.2008
D1
3.400
3.500
3.600
0.1339
0.1378
0.1417
D2
3.400
3.500
3.600
0.1339
0.1378
0.1417
E
4.900
5.000
5.100
0.1929
0.1969
0.2008
E1
3.400
3.500
3.600
0.1339
0.1378
0.1417
E2
3.400
3.500
3.600
0.1339
0.1378
0.1417
e
-
0.500
-
-
0.0197
-
L
0.300
0.400
0.500
0.0118
0.0157
0.0197
ddd
-
-
0.080
-
-
0.0031
1. Values in inches are converted from mm and rounded to 4 decimal digits.
Figure 39. UFQFPN32 - 32-pin, 5x5 mm, 0.5 mm pitch ultra thin fine pitch quad flat
recommended footprint
1. Dimensions are expressed in millimeters.
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7.4
Package information
Thermal characteristics
The maximum chip-junction temperature, TJ max, in degrees Celsius, may be calculated
using the following equation:
TJ max = TA max + (PD max × JA)
Where:

TA max is the maximum ambient temperature in C,

JA is the package junction-to-ambient thermal resistance, in C/W,

PD max is the sum of PINT max and PI/O max (PD max = PINT max + PI/Omax),

PINT max is the product of IDD and VDD, expressed in Watts. This is the maximum chip
internal power.
PI/O max represents the maximum power dissipation on output pins where:
PI/O max = (VOL × IOL) + ((VDD – VOH) × IOH),
taking into account the actual VOL / IOL and VOH / IOH of the I/Os at low and high level in the
application.
Table 82. Thermal characteristics(1)
Symbol
JA
Parameter
Value
Thermal resistance junction-ambient
UFQFPN32 - 5 x 5 mm / 0.5 mm pitch
36
Thermal resistance junction-ambient
LQFP32 - 7 x 7 mm / 0.8 mm pitch
60
Thermal resistance junction-ambient
WLCSP49 - 0.4 mm pitch
48
Unit
°C/W
1. TBD stands fro “to be defined”.
Figure 40. Thermal resistance
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Package information
7.4.1
STM32L082xx
Reference document
JESD51-2 Integrated Circuits Thermal Test Method Environment Conditions - Natural
Convection (Still Air). Available from www.jedec.org.
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Part numbering
Part numbering
Table 83. STM32L082xx ordering information scheme
Example:
STM32 L
082
K
Z
U
6
D TR
Device family
STM32 = ARM-based 32-bit microcontroller
Product type
L = Low power
Device subfamily
082 = USB + AES
Pin count
K = 32 pins
C = 48/49 pins
Flash memory size
B = 128 Kbytes
Z = 192 Kbytes
Package
T = LQFP
U = UFQFPN
Y = WLCSP pins
Temperature range
6 = Industrial temperature range, –40 to 85 °C
7 = Industrial temperature range, –40 to 105 °C
3 = Industrial temperature range, –40 to 125 °C
Options
No character = VDD range: 1.8 to 3.6 V and BOR enabled
D = VDD range: 1.65 to 3.6 V and BOR disabled
Packing
TR = tape and reel
No character = tray or tube
For a list of available options (speed, package, etc.) or for further information on any aspect
of this device, please contact your nearest ST sales office.
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Revision history
9
STM32L082xx
Revision history
Table 84. Document revision history
Date
Revision
02-Sep-2015
1
Initial release
2
Changed confidentiality level to public.
Updated datasheet status to “production data”.
Modified ultra-low-power platform features on cover page.
Changed number of ADC channels to 10.
Removed LCD alternate functions and added note related to
UFQFPN32 in Table 15: STM32L072xxx pin definition. Added PA15
in Table 16: Alternate functions port A and PB3 in Table 17: Alternate
functions port B.
In Section 6: Electrical characteristics, updated notes related to
values guaranteed by characterization.
Updated fTRIG in Table 61: ADC characteristics.
24-Mar-2016
3
Updated number of SPIs on cover page and in Table 1: Ultra-lowpower STM32L082xx device features and peripheral counts.
Changed minimum comparator supply voltage to 1.65 V on cover
page. Added minimum DAC supply voltage on cover page.
Added number of fast and standard channels in Section 3.11:
Analog-to-digital converter (ADC).
Updated Section 3.18.2: Universal synchronous/asynchronous
receiver transmitter (USART) and Section 3.18.4: Serial peripheral
interface (SPI)/Inter-integrated sound (I2S) to mention the fact that
USARTs with synchronous mode feature can be used as SPI master
interfaces.
Added baudrate allowing to wake up the MCU from Stop mode in
Section 3.18.2: Universal synchronous/asynchronous receiver
transmitter (USART) and Section 3.18.3: Low-power universal
asynchronous receiver transmitter (LPUART).
Section 6.3.15: 12-bit ADC characteristics:
– Table 61: ADC characteristics:
Distinction made between VDDA for fast and standard channels;
added note 1.
Added note 4. related to RADC.
Updated fTRIG.
Updated tS and tCONV.
– Updated equation 1 description.
– Updated Table 62: RAIN max for fADC = 16 MHz for fADC =
16 MHz and distinction made between fast and standard channels.
Updated RO and added Note 2. in Table 64: DAC characteristics.
Added Table 71: USART/LPUART characteristics.
03-May-2016
4
Added WLCSP49 package, STM32L082CZ part number and
corresponding features.
23-Oct-2105
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Changes
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STM32L082xx
IMPORTANT NOTICE – PLEASE READ CAREFULLY
STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and
improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on
ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order
acknowledgement.
Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or
the design of Purchasers’ products.
No license, express or implied, to any intellectual property right is granted by ST herein.
Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.
ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners.
Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2016 STMicroelectronics – All rights reserved
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