STMicroelectronics STM32L476 GDISCOVERY Discovery kit User manual

UM1879
User manual
Discovery kit with STM32L476VG MCU
Introduction
The STM32L476 discovery kit (32L476GDISCOVERY) helps the user to discover the
STM32L4 ultra-low-power features and to develop and share applications.
It is based on STM32L476VGT6 microcontroller with three I2Cs, three SPIs, six USARTs,
CAN, SWPMI, two SAIs, 12-bit ADCs, 12-bit DAC, LCD driver, internal 128 Kbytes of SRAM
and 1 Mbyte of Flash memory, Quad-SPI, touch sensing, USB OTG FS, LCD controller,
FMC, JTAG debugging support.
The 32L476GDISCOVERY includes an ST-LINK/V2-1 embedded debugging tool interface,
LCD (24 segments, 4 commons), LEDs, pushbutton, joystick, USB OTG FS, audio DAC,
MEMS (Microphone, 3 axis gyroscope, 6 axis compass), Quad-SPI Flash memory,
embedded ammeter measuring MCU consumption in low-power modes.
External boards can be connected thanks to extension and probing connectors.
Figure 1. STM32L476 discovery board
1. Picture not contractual.
August 2015
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1
Contents
UM1879
Contents
1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4
Delivery recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5
Bootloader limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7
Hardware layout and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.1
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Embedded ST-LINK/V2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1.1
Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1.2
ST-LINK/V2-1 firmware upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1.3
Using ST-LINK/V2-1 to program/debug the STM32L476VGT6 
on board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1.4
Using ST-LINK/V2-1 to program/debug an external STM32 application
board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.2
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.3
Clock source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.4
Reset source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.5
User interface: LCD, joystick, LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.6
Boot0 configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.7
Quad-SPI NOR Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.8
USB OTG FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.9
USART configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.10
Audio DAC and MEMS microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.11
9-axis motion sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.12
I2C extension connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.13
MCU current ammeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.14
Extension connector P1, P2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.15
Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
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Contents
Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Appendix A Power consumption measurements . . . . . . . . . . . . . . . . . . . . . . . . 35
Appendix B Mechanical drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
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3
List of tables
UM1879
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
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ON/OFF conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Jumper states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Debug connector CN4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Reset related jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Extension connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Solder bridges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Typical power consumption of the STM32L476 discovery board . . . . . . . . . . . . . . . . . . . . 36
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
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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.
STM32L476 discovery board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Hardware block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
STM32L476 discovery board top layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
STM32L476 discovery board bottom layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Updating the list of drivers in device manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
CN1, CN3 (ON), CN4 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
CN1, CN3 (OFF), CN4 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Board jumper location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Connector CN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
STM32L476 discovery board design top sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
ST-LINK/V2-1 with support of SWD only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
STM32L476VGT6 MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
IDD measurement / MFX (Multi Function eXpander) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Joystick ACP, LEDs and pushbutton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
LCD display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
OTG USB FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Audio DAC and microphone MEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Quad-SPI Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Gyroscope, accelerometer, magnetometer MEMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Power consumption tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
STM32L476 discovery board mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
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5
Features
1
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Features

STM32L476VGT6 microcontroller featuring 1 Mbyte of Flash memory and 128 Kbytes
of RAM in LQFP100 package

On-board ST-LINK/V2-1 supporting USB re-enumeration capability

Three different interfaces supported on USB:
–
Virtual com port
–
Mass storage
–
Debug port

Mbed-enabled (mbed.org)

LCD 24 segments, 4 commons in DIP 28 package

Seven LEDs:
–
LD1 (red/green) for ST-LINK/V2-1 USB communication
–
LD2 (red) for 3.3 V power on
–
LD3 over current (red)
–
LD4 (red), LD5 (green) two user LEDs
–
LD6 (green), LD7 (red) USB OTG FS LEDs

Pushbutton (reset)

Four direction joystick with selection

USB OTG FS with micro-AB connector

SAI Audio DAC, stereo with output jack

Digital microphone MEMS

Accelerometer and magnetometer MEMS

Gyroscope MEMS

128-Mbit Quad-SPI Flash memory

MCU current ammeter with 4 ranges and auto calibration

I2C extension connector for external board

Four power supply options:
–
ST-LINK/V2-1
–
USB FS connector
–
External 5V
–
CR2032 battery (not provided)

Extension connectors

Comprehensive free software including a variety of examples, part of STM32Cube
package
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Demonstration software
Demonstration software
The demonstration software is preloaded in the STM32L476VGT6 Flash memory for an
easy demonstration of the device peripherals in stand-alone mode. The latest versions of
the demonstration source code and associated documentation can be downloaded from
www.st.com/stm32l4-discovery.
3
Order code
To order the discovery kit based on the STM32L476VG MCU, use the order code:
STM32L476G-DISCO.
4
Delivery recommendations
Some verifications are needed before using the board for the first time to make sure that
nothing was damaged during the shipment and that no components are unplugged or lost.
When the board is extracted from its plastic bag, please check that no component remains
in the bag. In particularly, please make sure that the following jumpers on top side of the
board are plugged: CN3, JP3, JP5, and JP6.
The battery CR2032 is not provided.
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Bootloader limitations
5
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Bootloader limitations
Boot from system Flash memory results in executing bootloader code stored in the system
Flash memory protected against write and erase. This allows in-system programming (ISP),
that is, flashing the MCU user Flash memory. It also allows writing data into RAM. The data
come in via one of communication interfaces such as USART, SPI, I²C bus, USB or CAN.
Bootloader version can be identified by reading Bootloader ID at the address 0x1FFF6FFE.
The STM32L476VGT6 part soldered on the 32L476GDISCOVERYmain board is marked
with a date code corresponding to its date of manufacture. STM32L476VGT6 parts with the
date code prior or equal to week 22 of 2015 are fitted with bootloader V 9.0 affected by the
limitations to be worked around, as described hereunder. Parts with the date code starting
from week 23 of 2015 contain bootloader V 9.2 in which the limitations no longer exist.
To locate the visual date code information on the STM32L476VGT6 package, refer to its
datasheet (DS10198) available on www.st.com, section Package Information. Date code
related portion of the package marking takes Y WW format, where Y is the last digit of the
year and WW is the week. For example, a part manufactured in week 23 of 2015 bares the
date code 5 23.
Bootloader ID of the bootloader V 9.0 is 0x90.
The following limitations exist in the bootloader V 9.0:
1.
RAM data get corrupted when written via USART/SPI/I2C/USB interface
Description:
Data write operation into RAM space via USART, SPI, I²C bus or USB results in wrong
or no data written.
Workaround:
To correct the issue of wrong write into RAM, download STSW-STM32158 bootloader
V 9.0 patch package from www.st.com and load "Bootloader V9.0 SRAM patch" to the
MCU, following the information in readme.txt file available in the package.
2.
User Flash memory data get corrupted when written via CAN interface
Description:
Data write operation into user Flash memory space via CAN interface results in wrong
or no data written.
Workaround:
To correct the issue of wrong write into Flash memory, download STSW-STM32158
bootloader V 0.9 patch package from www.st.com and load "Bootloader V9.0 CAN patch" to
the MCU, following the information in readme.txt file available in the package
6
Conventions
Table 1 provides conventions used in the present document.
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Conventions
Table 1. ON/OFF conventions
Convention
Definition
Jumper JPx ON
Jumper fitted
Jumper JPx OFF
Jumper not fitted
Solder bridge SBx ON
SBx connections closed by solder
Solder bridge SBx OFF
SBx connections left opened
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Hardware layout and configuration
7
UM1879
Hardware layout and configuration
The STM32L476 discovery board is designed around the STM32L476VGT6 (100-pin LQFP
package). The hardware block diagram (see Figure 2) illustrates the connection between
STM32L476VGT6 and peripherals (9-axis motion sensors, digital microphone MEMS, LCD
segment, 128 Mbytes of Quad-SPI Flash memory, SAI Audio DAC stereo with 3.5mm
output jack, USB OTG FS, IDD current measurement, LEDs, pushbutton, joystick) and
Figure 3 will help to locate these features on the STM32L476 discovery board.
Figure 2. Hardware block diagram
A to Mini-B
USB
(3V CR2032 Battery)
CR1
SWD
Embedded
ST_LINK/V2-1
JP6
power
128Mb
QuadSPI flash
User LEDs
LD5 (green)
LD4 (red)
LCD segment
(4x24)
IO
IO
Header P1
digital
microphone
MEMS
STM32L476VGT6
IO
SAI Audio DAC
stereo
USB OTG FS with
Micro-A-B
connector
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reset
Reset
pushbutton
IDD current
measurement
Joystick with
4-direction
control and
selector
Header P2
9-axis motion
sensors
UM1879
Hardware layout and configuration
Figure 3. STM32L476 discovery board top layout
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Hardware layout and configuration
UM1879
Figure 4. STM32L476 discovery board bottom layout
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7.1
Hardware layout and configuration
Embedded ST-LINK/V2-1
The ST-LINK/V2-1 programming and debugging tool is integrated on the STM32L476
discovery board. Compared to ST-LINK/V2 the changes are listed below.
The new features supported on ST-LINK/V2-1 are:

USB software re-enumeration

Virtual com port interface on USB

Mass storage interface on USB

USB power management request for more than 100mA power on USB
These features are no more supported on ST-LINK/V2-1:

SWIM interface

Application voltage lower than 3 V
For all general information concerning debugging and programming features common
between V2 and V2-1 please refer to ST-LINK/V2 user manual (UM1075).
There are two different ways to use the embedded ST-LINK/V2-1 depending on the jumper
states:

Program/debug the STM32L476VGT6 on board (Section 7.1.3),

Program/debug an STM32 in an external application board using a cable connected to
SWD connector CN4 (Section 7.1.4)
.
Table 2. Jumper states
Jumper state
7.1.1
Description
Both CN3 jumpers ON
ST-LINK/V2-1 functions enabled for on board programming (default)
Both CN3 jumpers OFF
ST-LINK/V2-1 functions enabled for external board through external
CN4 connector (SWD supported)
Drivers
The ST-LINK/V2-1 requires a dedicated USB driver, which can be found on www.st.com for
Windows 7, 8 and XP.
In case the STM32L476 discovery board is connected to the PC before the driver is
installed, some interfaces may be declared as “Unknown” in the PC device manager. In this
case the user must install the driver files, and update the driver of the connected device
from the device manager.
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Hardware layout and configuration
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Figure 5. Updating the list of drivers in device manager
1. Prefer using the “USB Composite Device” handle for a full recovery.
7.1.2
ST-LINK/V2-1 firmware upgrade
The ST-LINK/V2-1 embeds a firmware upgrade mechanism for in-situ upgrade through the
USB port. As the firmware may evolve during the life time of the ST-LINK/V2-1 product (for
example a new functionality, bug fixes, support for new microcontroller families), it is
recommended to visit www.st.com before starting to use the STM32L476 discovery board
and periodically, in order to stay up-to-date with the latest firmware version.
7.1.3
Using ST-LINK/V2-1 to program/debug the STM32L476VGT6 
on board
To program the STM32L476VGT6 on board, simply plug in the two jumpers on CN3, as
shown in Figure 6 in red, and connect the STM32L476 discovery board to the PC through
the Mini-B USB ST-LINK/V2-1 CN1 connector.
Make sure the jumpers JP3, JP6.3V3, and JP5.ON are set.
Do not use the CN4 connector.
Figure 6. CN1, CN3 (ON), CN4 connections
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7.1.4
Hardware layout and configuration
Using ST-LINK/V2-1 to program/debug an external STM32 application
board
To use the ST-LINK/V2-1 to program the STM32 on an external application board (out of the
STM32L476VGT6 on board), remove the 2 jumpers from CN3 as shown in Figure 7 in red,
and connect your board to the CN4 software debug connector according to Table 3.
Make sure the jumpers JP6.3V3, and JP5.OFF are set.
JP3, must be ON if you use CN4 pin 5 (NRST) in your external application board.
Table 3. Debug connector CN4
Pin
CN4
Designation
1
Vapp
VDD from application
2
SWLCK
SWD clock
3
GND
Ground
4
SWDIO
SWD data input/output
5
NRST
RESET of target MCU
6
SWO
Reserved
Figure 7. CN1, CN3 (OFF), CN4 connections
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Hardware layout and configuration
7.2
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Power supply
The power supply is provided with four options:

–
ST-LINK/V2-1: CN1
–
CR2032 battery (not provided): CR1
–
External 5V: 5V_I
–
USB FS connector: USB USER CN7
ST-LINK/V2-1:
JP6 needs to be placed in position 3V3. JP3 is closed. JP5 is in position ON. CN3
jumpers are ON.
The STM32L476G discovery board can be powered from the ST-LINK USB connector
CN1 (5V_USB_ST_LINK). Only the ST-LINK circuit has the power before the USB
enumeration as the host PC only provides 100mA to the board at that time.
Then during the USB enumeration, the STM32L476 discovery board requires 300 mA
of current to the Host PC. If the host is able to provide the required power, the
STM32L476 is powered and the red LED LD2 is turned ON, thus the STM32L476
discovery board and its extension board can consume a maximum of 300 mA current,
no more. If the host is not able to provide the required current, the STM32L476 and the
extension board are not power supplied. As a consequence the red LED LD2 remains
turned OFF. In such case it is mandatory to use an external power supply as explained
in the next section.
Warning:
Note:
If the maximum current consumption of the STM32L476
discovery and its extension board exceeds 300 mA, it is
mandatory to power STM32L476 discovery using an external
power supply connected to 5V_I.
In case this board is powered by an USB charger or an USB battery connected on CN1,
there is no USB enumeration, the led LD2 remains OFF and the STM32L476 is not
powered. In this specific case only, please fit the jumper JP2 to allow the STM32L476 to be
powered anyway. Remove this jumper JP2 if then a Host PC is connected to the STLINK/V2-1 CN1 connector to supply the board.

CR2032 battery inserted in CR1 (bottom side):
The CR2032 battery is not provided.
JP6 needs to be placed in position BATT. JP3 is opened. JP5 is in position ON.
The battery supplies the 3V3 and 3V power domains on board. All the peripherals are
powered, except the ST-LINK which can only be supplied through the USB connector
CN1.

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External 5V_I or USB USER CN7 (USB FS connector):
–
External 5V_I: The pin 3 5V_I of P2 header can be used as input for an external
power supply. In this case, the STM32L476 discovery board must be powered by
a power supply unit or by an auxiliary equipment complying with standard EN60950-1: 2006+A11/2009, and must be Safety Extra Low Voltage (SELV) with a
limited power capability.
–
To use the USB USER CN7 to power supply the board, a jumper needs to be
placed between VUSB pin4 and the pin 3 5V_I of P2 Header (Figure 8).
DocID027676 Rev 2
UM1879
Hardware layout and configuration
Figure 8. Board jumper location
In this condition it is still possible to use the USB ST-LINK for communication, for
programming or debugging, but it is mandatory to power supply the board first using
5V_I or USB USER CN7 then connect the USB ST-LINK cable to the PC. Proceeding
this way ensures that the enumeration occurs thanks to the external power source.
The following power sequence procedure must be respected:
1.
Connect the external power source to 5V_I or USB USER CN7.
2.
Power on the external power supply 5V_I or USB USER CN7.
3.
Check that LD2 is turned ON.
4.
Connect the PC to USB ST-LINK connector CN1.
If this order is not respected, the board may be supplied by 5V_USB_ST_LINK first
then by 5V_I or USB USER CN7 and the following risks may be encountered:
Note:
1.
If more than 300 mA current is needed by the board, the PC may be damaged or the
current supply can be limited by the PC. As a consequence the board is not powered
correctly.
2.
300 mA is requested at enumeration (since JP2 must be OFF) so there is risk that the
request is rejected and the enumeration does not succeed if the PC cannot provide
such current. Consequently the board is not power supplied (LED LD2 remains OFF).
The headers pins 5V (except in battery mode), 3V3, 2V5, 3V can be used as output power
supply when an extension board is connected to the P1 and P2 headers. The power
consumption of the extension board must be lower than 100 mA.
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38
Hardware layout and configuration
7.3
UM1879
Clock source
The STM32L476VGT6 MCU uses:


A 32.768 kHz low-speed source:
–
By default, the X3 crystal on board
–
From an external oscillator through P2 header (pin7 labeled ‘PC14’). The
configuration needed is: SB19 opened, SB20 closed, R26 removed.
A system clock source:
–
By default, generated by an internal STM32L476VGT6 oscillator.
The configuration needed is:
- SB18 opened, SB21 and SB22 closed.
–
Or driven by an X2 Crystal on board (not fitted).
The configuration needed is:
- SB18, SB21 and SB22 opened.
- X2, R88, R89, C77, C78 fitted
–
Or driven by a MCO signal (8MHz) from the ST-LINK MCU STM32F103CBT6
(U3).
The configuration needed is:
- SB18 closed, SB22 opened.
- R89 not fitted.
–
Or driven externally from PH0 through the P2 header, pin9 labeled ‘PH0’
The configuration needed is:
- SB22 closed, SB18 opened.
- R89 not fitted.
Note:
Please refer to oscillator design guide for STM32 microcontrollers (AN2867)
7.4
Reset source
The reset signal NRST of the STM32L476 discovery board is low active and the reset
sources include:

The reset button B1, connected by default to NRST (SB23 closed)

The embedded ST-LINK/V2-1

The external reset pin 11 of P2 header connector, labeled ‘NRST’

The external reset from SWD connector CN4, pin5
Table 4. Reset related jumper
Jumper
JP3
18/39
Description
When JP3 is closed, the SWD connector CN4 pin5 and the embedded
ST-LINK/V2-1 are connected to NRST.
Default Setting: closed
JP3 is opened, no connection between CN4 and ST-LINK/V2-1 to
NRST. This must be used when the ST-LINK/V2-1 is not powered (i.e
STM32L476 discovery board) is powered by the CR2032 battery
DocID027676 Rev 2
UM1879
7.5
Hardware layout and configuration
User interface: LCD, joystick, LEDs
The STM32L476 discovery board features 7 LEDs with the following functionalities:

LD1 COM: LD1 default status is red. LD1 turns to green to indicate that
communications are in progress between the PC and the ST-LINK/V2-1.

LD2 PWR: the red LED indicates that the board is powered.

LD3 OC: the red LED indicates a fault when the board is in current limit (510 mA).

LD4 user: The red LED is a user LED connected to the I/O PB2 of the
STM32L476VGT6.

LD5 user: The green LED is a user LED connected to the I/O PE8 of the
STM32L476VGT6.

LD6, LD7: USB OTG FS LEDs, see Section 7.8
Four direction joystick (B2) with selection and a reset pushbutton (B1) are available as input
devices.
A LCD 4x24 segments, 4 commons, multiplexed 1/4 duty, 1/3 bias is mounted on the DIP28
connector U5.
7.6
Boot0 configuration
Boot0 is by default grounded through a pull-down R91.
It is possible to set Boot0 high, removing R91 and putting a jumper between P1 header pin
6 BOOT0 and pin5 3V.
7.7
Quad-SPI NOR Flash memory
128-Mbit Quad-SPI NOR Flash memory is connected to Quad-SPI interface of
STM32L476VGT6.
7.8
USB OTG FS
The STM32L476 discovery board supports USB OTG Full Speed communication via an
USB Micro-AB connector (CN7) and USB power switch (U14) connected to VBUS. The
board can be powered by this USB connection as described in Section 7.2.
A green LED LD6 will be lit in one of these cases:

The power switch (U14) is ON and STM32L476 discovery board works as a USB host

VBUS is powered by another USB host when STM32L476 discovery board works as
an USB device.
Red LED LD7 will be lit when an over-current occurs.
In order to connect the OTG_FS_VBUS and OTG_FS_ID signals from the connector CN7 to
the OTG FS hardware IP of STM32L476VGT6, please remove the LCD from its socket U5,
and close SB24 and SB25.
The default configuration is that the LCD is connected to U5, and SB24 and SB25 are
opened. In this case the OTG_FS_VBUS and OTG_FS_ID signals from CN7 are connected
to the OTG FS peripheral of the STM32L476VGT6 available on PC11 and PC12.
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38
Hardware layout and configuration
7.9
UM1879
USART configuration
The USART interface available on PD5 and PD6 of the STM32L476VGT6 can be
connected to ST-LINK MCU to use the Virtual Com Port function.
To use the Virtual Com Port function with:

The onboard STM32L476VGT6: set SB13 and SB16 ON. (SB15, SB17 must be OFF)

An external MCU: remove solder from SB13 and SB16, solder a 2 pins header on JP4,
then you can connect RX and TX of the external MCU directly to RX and TX of JP4.
(For more details see Section 8: Schematics)
7.10
Audio DAC and MEMS microphone
An audio stereo DAC CS43L22 (U13) is connected to SAI interface of STM32L476VGT6.
The STM32L476VGT6 controls the audio DAC via the I2C1 bus which is shared with the
I2C extension connector CN2.
I2C1 is also available on the connector P1, pins labeled ‘PB6’ (I2C1_SCL) and ‘PB7’
(I2C1_SDA).
The stereo output jack connector is CN6.
Note:
I2C address of CS43L22 is 0x94.
A MEMS audio sensor omnidirectional digital microphone provides a digital signal in PDM
format to the STM32L476VGT6.
7.11
9-axis motion sensors
STM32L476 discovery board supports some 9-axis motion sensors, composed of:

L3GD20 (U7): a three-axis digital output gyroscope,

LSM303C (U6): a 3D accelerometer and 3D magnetometer module,
which are connected to STM32L476VGT6 through SPI.
7.12
I2C extension connector CN2
Figure 9. Connector CN2
069
20/39
DocID027676 Rev 2
UM1879
Hardware layout and configuration
Table 5. Connector CN2
7.13
Pin number
Description
Pin number
Description
1
I2C1_SDA (PB7)
5
+3V3
2
NC
6
NC
3
I2C1_SCL (PB6)
7
GND
4
EXT_RST(PD0)
8
NC
MCU current ammeter
The jumper JP5, labeled Idd, allows the consumption of STM32L476VGT6 to be measured
directly by a built-in current ammeter circuit able to measure from 60nA to 50mA or by
removing the jumper and connecting an ammeter

Jumper on position OFF: STM32L476VGT6 is powered (default).

Jumper on position ON: a module onboard is designed to measure from 60nA to 50mA
by using several MOSFETs and switching automatically depending on the read value.

No jumper on JP5: an ammeter must be connected to measure the STM32L476VGT6
current through pin 1 and 2 (if there is no ammeter, the STM32L476VGT6 is not
powered).
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38
Hardware layout and configuration
7.14
UM1879
Extension connector P1, P2
The P1 and P2 headers can connect the STM32L476 discovery board to a standard
prototyping/wrapping board. STM32L476VGT6 GPIOs are available on these connectors.
P1 and P2 can also be probed by an oscilloscope, logical analyzer or voltmeter.
Table 6. Extension connector
P1
22/39
P2
Pin number
function
Pin number
function
1
3V3
1
5V_U
(5V_USB_ST_LINK)
2
GND
2
GND
3
2V5
3
5V_I
(5V INPUT)
4
GND
4
VUSB
(USB OTG FS VBUS)
5
3V
5
5V
6
BOOT0
6
GND
7
PB3
7
PC14
8
PB2
8
PC15
9
PE8
9
PH0
10
PA0
10
PH1
11
PA5
11
NRST
12
PA1
12
GND
13
PA2
13
PE11
14
PA3
14
PE10
15
PB6
15
PE12
16
PB7
16
PE13
17
PD0
17
PE14
18
NC
18
PE15
19
GND
19
GND
20
GND
20
GND
DocID027676 Rev 2
UM1879
7.15
Hardware layout and configuration
Solder bridges
Table 7 describes each solder bridge. The default state is indicated in bold.
Table 7. Solder bridges
Bridge
State
Description
ON
ST-LINK module is powered
OFF
ST-LINK module is not powered
ON
5V connected to CN2.8
OFF
5V is not connected to CN2.8
SB3, SB4, SB7, SB8
(RESERVED)
OFF
Reserved, do not modify
SB5, SB6, SB9, SB10 (DEFAULT)
ON
Reserved, do not modify
ON
No incidence on NRST signal of STM32F103CBT6
OFF
NRST signal of STM32F103CBT6 is connected to
GND
OFF
Reserved
ON
PA2, PA3 of STM32F103CBT6 are connected to PD6,
PD5 of STM32L476VGT6
OFF
PA2, PA3 of STM32F103CBT6 are not connected to
PD6, PD5 of STM32L476VGT6
ON
PA10 of STM32F103CBT6 are not connected to PB3 of
STM32L476VGT6
OFF
PA2, PA3 of STM32F103CBT6 are connected to MFX
USART RX,TX
ON
PA10 of STM32F103CBT6 is connected to PB3 of
STM32L476VGT6
OFF
PA10 of STM32F103CBT6 is not connected to PB3 of
STM32L476VGT6
ON
If SB22 is also ON, MCO is connected to PH0
OFF
MCO is not connected to PH0
ON
PC14, PC15 are connected to X3 crystal
OFF
PC14, PC15 are not connected to X3 crystal
ON
PH0, PH1 are connected to X2 crystal. (X2 is not fitted)
OFF
PH0, PH1 are not connected to X2 crystal
ON
B1 pushbutton is connected to NRST of STM32L476
discovery board
OFF
B1 pushbutton is not connected to NRST of
STM32L476 discovery board
SB1 (ST-LINK PWR)
SB2 (EXT/RF E2P)
SB11 (STM_RST)
SB12
SB16, SB13 (USART RX, TX)
SB17, SB15 (MFX USART RX,TX)
SB14 (T_SWO)
SB18 (MCO)
SB19, SB20 (32.768kHz CLK)
SB21, SB22 (8MHz CLK)
SB23 (B1-RESET)
DocID027676 Rev 2
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38
Hardware layout and configuration
UM1879
Table 7. Solder bridges (continued)
Bridge
State
ON
OTG_FS_VBUS signal is connected to PA9
OTG_FS_ID signal is connected to PA10
OFF
OTG_FS_VBUS signal is not connected to PA9
OTG_FS_ID signal is not connected to PA10
SB26
ON
Reserved, do not modify
SB27
OFF
Reserved, do not modify
ON
U12 (2.5V regulator) input is inhibited
OFF
U12 input is not inhibited
ON
5V is connected to U12 input
OFF
5V is not connected to U12 input
SB24, SB25 (OTG FS)
SB28 (2.5V REG inhibit)
SB29 (2.5V REG input)
24/39
Description
DocID027676 Rev 2
DocID027676 Rev 2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Header 20
P2
GND
GND
GND
GND
GND
3V3_REG-ON
QSPI_CS
QSPI_CLK
QSPI_D0
QSPI_D1
QSPI_D2
QSPI_D3
PC14
PC15
PH0
PH1
NRST
5V
PE11
PE10
PE12
PE13
PE14
PE15
OTG_FS_VBUS
3V
2V5
3V3
MFX_USART3_RX
MFX_USART3_TX
USART_RX
USART_TX
U_ST_LINK_V2-1
ST_LINK_V2-1.SCHDOC
AUDIO_RST
AUDIO_DIN
AUDIO_CLK
SAI1_MCK
SAI1_SCK
SAI1_SD
SAI1_FS
I2C1_SDA
I2C1_SCL
U_AUDIO
AUDIO.SchDoc
QSPI_D0
QSPI_D1
QSPI_D2
QSPI_D3
QSPI_CS
QSPI_CLK
5V_USB_ST_LINK
5V_IN
3V3_REG-ON
MFX_USART3_RX
MFX_USART3_TX
USART_RX
USART_TX
AUDIO_RST
AUDIO_DIN
AUDIO_CLK
SAI1_MCK
SAI1_SCK
SAI1_SD
SAI1_FS
I2C1_SDA
I2C1_SCL
QSPI_D0
QSPI_D1
QSPI_D2
QSPI_D3
QSPI_CS
QSPI_CLK
U_QSPI
QSPI.SchDoc
SEG[0..23]
COM[0..3]
U_LCD_GH08172
LCD_GH08172.SchDoc
PB3
PB2
PE8
PA0
PA5
PA1
PA2
PA3
PB6
PB7
PD0
GND
P1
MCO
NRST
SWCLK
SWDIO
SWO
Header 20
1
2
3
GND
4
5
BOOT0
6
3V3_REG-ON
7
LD_R
8
LD_G
9
JOY_CENTER
10
JOY_DOWN
11
JOY_LEFT
12
JOY_RIGHT
13
JOY_UP
14
I2C1_SCL
15
I2C1_SDA
16
EXT_RST
17
NC
18
GND
19
GND
20
MCO
NRST
SWCLK
SWDIO
SWO
MFX_WAKEUP
MFX_IRQ_OUT
MFX_I2C_SDA
MFX_I2C_SCL
MFX_USART3_RX
MFX_USART3_TX
NRST
MFX_WAKEUP
MFX_IRQ_OUT
MFX_I2C_SDA
MFX_I2C_SCL
MFX_USART3_RX
MFX_USART3_TX
USART_RX
USART_TX
3V3_REG-ON
BOOT0
NRST
SWCLK
SWDIO
SWO
MCO
I2C1_SDA
I2C1_SCL
EXT_RST
AUDIO_RST
AUDIO_DIN
AUDIO_CLK
SAI1_MCK
SAI1_SCK
SAI1_SD
SAI1_FS
QSPI_CS
QSPI_CLK
QSPI_D0
QSPI_D1
QSPI_D2
QSPI_D3
MAG_CS
MAG_DRDY
MAG_INT
XL_CS
XL_INT
GYRO_CS
GYRO_INT2
GYRO_INT1
MEMS_SCK
MEMS_MOSI
MEMS_MISO
JP7
JP8
Wired on Solder Side
MFX_WAKEUP
MFX_IRQ_OUT
MFX_I2C_SDA
MFX_I2C_SCL
MFX_USART3_RX
MFX_USART3_TX
NRST
U_IDD_measurement
IDD_measurement.SchDoc
MFX_WAKEUP
MFX_IRQ_OUT
MFX_I2C_SDA
MFX_I2C_SCL
MFX_USART3_RX
MFX_USART3_TX
USART_RX
USART_TX
LD_R
LD_G
JOY_CENTER
JOY_DOWN
JOY_LEFT
JOY_RIGHT
JOY_UP
COM[0..3]
SEG[0..23]
PH[0..1]
PC14
PC15
OTG_FS_PowerSwitchOn
OTG_FS_OverCurrent
OTG_FS_DM
OTG_FS_DP
OTG_FS_ID
OTG_FS_VBUS
3V3_REG-ON
BOOT0
NRST
SWCLK
SWDIO
SWO
MCO
I2C1_SDA
I2C1_SCL
EXT_RST
AUDIO_RST
AUDIO_DIN
AUDIO_CLK
SAI1_MCK
SAI1_SCK
SAI1_SD
SAI1_FS
QSPI_CS
QSPI_CLK
QSPI_D0
QSPI_D1
QSPI_D2
QSPI_D3
U_STM32Lx
STM32Lx.SchDoc
MAG_CS
MAG_DRDY
MAG_INT
XL_CS
XL_INT
GYRO_CS
GYRO_INT2
GYRO_INT1
MEMS_SCK
MEMS_MOSI
MEMS_MISO
U_MEMS
MEMS.SchDoc
OTG_FS_PowerSwitchOn
OTG_FS_OverCurrent
OTG_FS_DM
OTG_FS_DP
OTG_FS_ID
OTG_FS_VBUS
U_USB_OTG_FS
USB_OTG_FS.SchDoc
NRST
LD_R
LD_G
JOY_CENTER
JOY_DOWN
JOY_LEFT
JOY_RIGHT
JOY_UP
EXT_RST
I2C1_SCL
I2C1_SDA
Reference: MB1184
Date: 6/15/2015
Size: A4
Project: STM32L476G-DISCO
Sheet: 1 of 10
Revision: C-01
Rev A-01 --> PCB label MB1184 A-01
Rev B-01 --> PCB label MB1184 B-01, Remove R91, Replace COM4..7 by COM0..3,
Add SB for USB_OTG, add VBUS on P2 for USB USER power supply
Rev C-01 --> PCB label MB1184 C-01, Remove SWCLK and SWO shorted,
Replaced on P1, PB8..9 by PB6..7.
--> MP45DT02 replaced by MP34DT01
--> Xtal 32.768kHz replaced by NX3215SA
--> Change values of C27, C25 : C27=C25=4.7pF
--> Change values of resistors : R40=R47=6.04k, R49=15k,
Title: STM32L476 Discovery
MAG_CS
MAG_DRDY
MAG_INT
XL_CS
XL_INT
GYRO_CS
GYRO_INT2
GYRO_INT1
XL_CS
XL_INT
MAG_CS
MAG_DRDY
MAG_INT
MEMS_SCK
MEMS_MOSI
MEMS_MISO
OTG_FS_PowerSwitchOn
OTG_FS_OverCurrent
OTG_FS_DM
OTG_FS_DP
OTG_FS_ID
OTG_FS_VBUS
NRST
LD_R
LD_G
JOY_CENTER
JOY_DOWN
JOY_LEFT
JOY_RIGHT
JOY_UP
EXT_RST
I2C1_SCL
I2C1_SDA
GYRO_CS
GYRO_INT2
GYRO_INT1
MEMS_SCK
MEMS_MOSI
MEMS_MISO
OTG_FS_PowerSwitchOn
OTG_FS_OverCurrent
OTG_FS_DM
OTG_FS_DP
OTG_FS_ID
OTG_FS_VBUS
LD_R
LD_G
JOY_CENTER
JOY_DOWN
JOY_LEFT
JOY_RIGHT
JOY_UP
COM[0..3]
SEG[0..23]
PH[0..1]
PC14
PC15
U_Peripherals
Peripherals.SchDoc
8
SEG[0..23]
COM[0..3]
UM1879
Schematics
Schematics
Figure 10. STM32L476 discovery board design top sheet
25/39
38
USART_TX
MFX_USART3_TX
SB15
SB17
Close to JP
Not Fitted
USB-MINI-typeB
VCC
DD+
ID
GND
SHELL
1
2
3
4
5
6
1K5_1%_0402
R9 0_5%_0402 USB_DM
R8
USB_DP
0_5%_0402
R6
100K_1%_0402
R7
VBAT
PC13
PC14
PC15
OSCIN
OSCOUT
NRST
VSSA
VDDA
PA0
PA1
PA2
Not Fitted
STLINK_RX
1
2
3
4
5
6
7
8
9
10
11
12
1
R78
36K_1%_0402
R79
USB_RENUMn
100_1%_0402
R10
10K_1%_0402
5V_USB_ST_LINK
3V3_ST_LINK
SB13
JP4
AIN_1
OSC_IN
OSC_OUT
STM_RST
SB16
TX
RX
T1
9013-SOT23
5V_USB_ST_LINK
USB
8MHz
3V3_ST_LINK
C73
R85
100nF
4K7_1%_0402
R84
4K7_1%_0402
MFX_USART3_RX
USART_RX
SB11
R86
100K_1%_0402
CN1
C10
20pFX1
20pF
3V3_ST_LINK1
2
C11
T_JTCK
[NA]
3V3_ST_LINK
100K_1%_0402
T_JTDO
T_JTDI
R83
R14
10K_1%_0402
SWIM
R82
SWIM_IN
C71
C6
3V3_ST_LINK
C8
R4
3
330_1%_0402
R5
2
330_1%_0402
3V3_ST_LINK
4 R1
0_5%_0402
1
LD_BICOLOR_CMS
_Green
Red
LD1
COM
LD2
LED, red
1
2
3
4
5
6
D1
22_1%_0402
T_JTMS
22_1%_0402 T_NRST
22_1%_0402 T_SWO
5V_USB_ST_LINK
5 Volts From External
3V
D6
3V3
SET
GND
FAULT
ON
JP6
STPS1L30A
CR1
CR2032 Holder
3V3_REG-ON
ST890CDR
OUT
OUT
IN
IN
U2
3V3_REG-ON
3
8
1
2
4
5
6
7
SB12
3V3
SB28
1uF
6
1
STM_JTMS
STM_JTCK
TP1
TP2
3
1
INH
GND
Vin
NC
INH
GND
Vin
10nF
C49
BYPASS
Vout
1uF
C47
Reference: MB1184
Date: 6/15/2015
5
1uF
C14
5
3
4
1uF
LD39050PU33R
PG
VO
5
C1
U12 LD3985M25R
C54
100nF
3
1
VI
EN
U4
5 Volts Output
10nF
C3
BYPASS
Vout
U1 LD3985M33R
Project: STM32L476G-DISCO
Size: A4
SWDIO
SWCLK
3V3_ST_LINK
SWO
SWCLK
SWDIO
NRST
SWD
Sheet: 2 of 10
Revision: C-01
100nF
C48
2V5
2.5 Volts Output
C15
100nF
3V3_REG
3 Volts Output
100nF
C2
3V3_ST_LINK
ST-LINK Power
Jumpers ON --> DISCOVERY Selected
Jumpers OFF --> ST-LINK Selected
SB8
SB7
SB4
SB3
C4
100nF
100nF
C12
5V
C55
SB29
1uF
C5
SB14
JP3
PB3
PA14
PA13
Title: ST-LINK/V2-1 with support of SWD only
5V
1uF
T_SWO
1
2
3
4
CN3
SB1
SB10
SB9
SB6
SB5
DEFAULT
100nF
2K7_1%_0402
C13
R16
C9
D2
STPS1L30A
D3
STPS1L30A
Ilim = 510mA
Isc= 1.2Ilim to 1.5Ilim = 612mA to 765mA
4K7_1%_0402 R33
PWR_ENn
3V3_REG
5V_IN
5 Volts From USB ST-LINK
R11
10K_1%_0402
LD3
LED, red
MCO
Not Fitted
R3
1K_1%_0402
R80
100_1%_0402
C72
20pF
MCO
RC Must be very close to STM32F103 pin 29
R20
R21
R22
R13
AIN_1
[NA]
BAT60JFILM
R17
T_JTCK
22_1%_0402
R12
10K_1%_0402
5075BMR-05-SM
CN4
SWD
100_1%_0402
R2
1K_1%_0402
3V3_REG
T_SWDIO_IN
PWR_ENn
T_JTMS
T_JTCK
R81
3V3_ST_LINK
STM_JTMS
USB_DP
USB_DM
T_SWO
LED_STLINK
100nF 100nF 100nF 100nF
C7
3V3_ST_LINK
[NA]
R15
3V3_ST_LINK
36
35
34
33
32
31
30
29
28
27
26
25
5V_IN
U3
STM32F103CBT6
Not Fitted
3V3_ST_LINK
USB_RENUMn
STM_JTCK
JP2
VDD_2
VSS_2
JTMS/SWDIO
PA12
PA11
PA10
PA9
PA8
PB15
PB14
PB13
PB12
LED_STLINK
JP1
T_NRST
STLINK_TX
SWIM_RST
SWIM_RST_IN
T_JRST
Board Ident: PC13=0
3
2
PWR_EXT
48
47
46
45
44
43
42
41
40
39
38
37
VDD_3
VSS_3
PB9
PB8
BOOT0
PB7
PB6
PB5
PB4/JNTRST
PB3/JTDO
PA15/JTDI
JTCK/SWCLK
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2/BOOT1
PB10
PB11
VSS_1
VDD_1
13
14
15
16
17
18
19
20
21
22
23
24
BAT60JFILM
3
D4
2K7_1%_0402
2
RESERVED
T_NRST
2
R19
1
4
R18
4K7_1%_0402
1
2
2
GND
2
GND
DocID027676 Rev 2
7
26/39
4
TCK/SWCLK
TMS/SWDIO
Schematics
UM1879
Figure 11. ST-LINK/V2-1 with support of SWD only
DocID027676 Rev 2
PC14-OSC32_IN
PH1-OSC_OUT
PH0-OSC_IN
SB18
SB19
PC15-OSC32_OUT
Must be close to the Crystal
SB20
SB21
SB22
MCO
Must be close to the MCU
PH[0..1]
COM0
COM1
COM2
COM3
R25
0_5%_0402
R26
0_5%_0402
R88
220_1%_0402
R89
0_5%_0402
VREF+
R24
47_1%_0402
VDDA
L1
Ferrite
VDD_MCU
C80
100nF_X7R_10%_0402
C29
100nF_X7R_10%_0402
C35
100nF_X7R_10%_0402
C82
100nF_X7R_10%_0402
C81
100nF_X7R_10%_0402
C83
100nF_X7R_10%_0402
C75
100nF_X7R_10%_0402
C74
1uF_POL_10%_TANA
C24
100nF_X7R_10%_0402
C23
1uF_POL_10%_TANA
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
C27
20pF_NPO_5%_0402
C77
6
21
22
11
28
100
75
50
73
VBAT
VREF+
VDDA_ADC
VDD5
VDD4
VDD3
VDD2
VDD1
VDDUSB
U9B
VSSA_ADC
VREF-
VSS5
VSS4
VSS3
VSS2
VSS1
4.7pF_NPO_-+0.25pF_0402
C79
STM32L476VGT6
1uF_X5R_10%_0603
VREF+
VDDA
R90
0_5%_0402
VDD_MCU
VLCD
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
20pF_NPO_5%_0402
C78
PC3
PC8
PC6
PD14
PD12
PD10
PD8
PB14
PB12
PB0
PC4
PA6
4.7pF_NPO_-+0.25pF_0402
X3
NX3215SA-32.768K
C25
X2
8MHz
Not Fitted
PA7
PC5
PB1
PB13
PB15
PD9
PD11
PD13
PD15
PC7
PA15
PB4
PB5
All this block must be very close to the STM32L476
PC15
PC14
PH1
PH0
MCO
PH[0..1]
PC15
PC14
PC15
PC14
PA8
PA9
PA10
PB9
2
1
19
20
10
27
99
74
49
35
36
37
89
90
91
92
93
95
96
47
48
51
52
53
54
15
16
17
18
33
34
63
64
65
66
78
79
80
7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PB8
PB9
PB10
PB11
PB12
PB13
PB14
PB15
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
PC8
PC9
PC10
PC11
PC12
PC13
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA9
PA10
PA11
PA12
PA13
PA14
PA15
23
24
25
26
29
30
31
32
67
68
69
70
71
72
76
77
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PD8
PD9
PD10
PD11
PD12
PD13
PD14
PD15
PE0
PE1
PE2
PE3
PE4
PE5
PE6
PE7
PE8
PE9
PE10
PE11
PE12
PE13
PE14
PE15
SWCLK
SWDIO
SWO
USART_TX
USART_RX
3V3_REG-ON
STM32L476VGT6
PC0
PC1
PC2
PC3/VLCD PH0
PC4
PH1
PC5
PC6
PC7
PC14
PC8
PC15
PC9
PC10
PC11
NRST
PC12
PC13
BOOT0
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PB8
PB9
PB10
PB11
PB12
PB13
PB14
PB15
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA9
PA10
PA11
PA12
PA13
PA14
PA15
U9A
SWCLK
SWDIO
SWO
PA14
PA13
PB3
VDD_MCU
USART_TX
USART_RX
PD5
PD6
C76
1uF_X5R_10%_0603
[NA]
R87
3V3_REG-ON
PB3
94
14
R91
510_1%_0402
BOOT0
NRST
2K2_1%_0402
2K2_1%_0402
R32
R31
BOOT0
PC14-OSC32_IN
PC15-OSC32_OUT
8
9
3V
PH0-OSC_IN
PH1-OSC_OUT
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PD8
PD9
PD10
PD11
PD12
PD13
PD14
PD15
PE0
PE1
PE2
PE3
PE4
PE5
PE6
PE7
PE8
PE9
PE10
PE11
PE12
PE13
PE14
PE15
12
13
81
82
83
84
85
86
87
88
55
56
57
58
59
60
61
62
97
98
1
2
3
4
5
38
39
40
41
42
43
44
45
46
R93
R92
SB25
SB24
MAG_CS
MAG_DRDY
MAG_INT
XL_CS
XL_INT
GYRO_CS
GYRO_INT2
GYRO_INT1
MEMS_SCK
MEMS_MOSI
MEMS_MISO
MFX_WAKEUP
MFX_IRQ_OUT
MFX_I2C_SCL
MFX_I2C_SDA
MFX_USART3_TX
MFX_USART3_RX
JOY_CENTER
JOY_DOWN
JOY_LEFT
JOY_RIGHT
JOY_UP
NRST
LD_R
LD_G
EXT_RST
SEG[0..23]
COM[0..3]
OTG_FS_PowerSwitchOn
OTG_FS_VBUS
OTG_FS_DM
OTG_FS_DP
OTG_FS_ID
OTG_FS_OverCurrent
AUDIO_RST
AUDIO_DIN
AUDIO_CLK
SAI1_MCK
SAI1_SCK
SAI1_SD
SAI1_FS
I2C1_SDA
I2C1_SCL
Reference: MB1184
Date: 6/15/2015
Size: A4
Project: STM32L476G-DISCO
Title: STM32L476VGT6 MCU
4K7_1%_0402
4K7_1%_0402
PA10
PA9
Layout priority to PA9, PA10
3V
QSPI_D0
QSPI_D1
QSPI_D2
QSPI_D3
QSPI_CS
QSPI_CLK
MAG_CS
MAG_DRDY
MAG_INT
XL_CS
XL_INT
GYRO_CS
GYRO_INT2
GYRO_INT1
MEMS_SCK
MEMS_MOSI
MEMS_MISO
MFX_WAKEUP
MFX_IRQ_OUT
MFX_I2C_SCL
MFX_I2C_SDA
MFX_USART3_TX
MFX_USART3_RX
JOY_CENTER
JOY_DOWN
JOY_LEFT
JOY_RIGHT
JOY_UP
NRST
LD_R
LD_G
EXT_RST
SEG[0..23]
COM[0..3]
OTG_FS_PowerSwitchOn
OTG_FS_VBUS
OTG_FS_DM
OTG_FS_DP
OTG_FS_ID
OTG_FS_OverCurrent
AUDIO_RST
AUDIO_DIN
AUDIO_CLK
SAI1_MCK
SAI1_SCK
SAI1_SD
SAI1_FS
I2C1_SDA
I2C1_SCL
QSPI_D0
QSPI_D1
QSPI_D2
QSPI_D3
QSPI_CS
QSPI_CLK
Sheet: 3 of 10
Revision: C-01
PC0
PC2
PC1
PE0
PE1
PD7
PB8
PD2
PD1
PD4
PD3
PA4
PC13
PB10
PB11
PA0
PA5
PA1
PA2
PA3
PB2
PE8
PD0
PC9
PC11
PA11
PA12
PC12
PC10
PE3
PE7
PE9
PE2
PE5
PE6
PE4
PB7
PB6
PE12
PE13
PE14
PE15
PE11
PE10
UM1879
Schematics
Figure 12. STM32L476VGT6 MCU
27/39
38
Current
direction
bypass
to MCU
1
2
5
6
4
100K_1%_0402
R36
3
T3
STT7P2UH7
see note *
MFX_WAKEUP
C32
[NA]
VDD_MCU
JP5
R39
1_1%_0805
SH0_D
SH1
3
D
44
46
7
2
34
37
MFX_I2C_SCL 42
MFX_I2C_SDA 43
MFX_SWDIO
MFX_SWCLK
510_1%_0402
R28
10
11
12
13
25
T7
STT7P2UH7
see note *
SH2
R43
24_1%_0805
R38
SH1_D
100K_1%_0402
1
2
5
6
4
CAL_D
R37
100K_1%_0402
CAL
MFX_USART3_RX
3
USAR
USART_TX
A T_TX
USART_RX
USAR
A T_RX
R
I2C_SCL
I2C_SDA
I2C_ADDR
BOOT0
IRQOUT
NRST
WAKEUP
W
WA
AKEUP
SWDIO
SWCLK
IDD_SH0
IDD_SH1/GPO5
IDD_SH2/GPO6
IDD_SH3/GPO7
IDD_CAL/GPO4
IDD_MEAS
IDD_VDD_MCU
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
GPIO8
GPIO9
GPIO10
GPIO11
GPIO12
GPIO13
GPIO14
GPIO15
3V_MFX
R30
0_5%_0603
4
5
6
38
3
14
41
T9
STT7P2UH7
see note *
Shunts
R44
R41
620_1%_0805 10K_1%_0805
6
5
2
3
VDD_MCU
3V3
V-
V+
2
3
6
U10B
TSZ122IST
R47
7
6K04_1%_0402
differential
amplifier
5
6K04_1%_0402
U10A
TSZ122IST
R40
1
R49
15K_1%_0402
C38
3V_MFX
SB26
R48
300K_1%_0402
SB27
3V3
V-
V+
C37
100nF_X7R_10%_0402
300K_1%_0402
R50
MFX_SWDIO
MFX_SWCLK
3V_MFX
4
4
4
5
6
7
8
1
2
3
5
6
7
8
1
2
3
5
6
7
8
Reference: MB1184
Date: 6/15/2015
Size: A4
Project: STM32L476G-DISCO
SH2_D
CAL_D
SH1_D
CAL_D
CAL_D
C26
100nF_X7R_10%_0402
C30
100nF_X7R_10%_0402
C31
100nF_X7R_10%_0402
C28
100nF_X7R_10%_0402
one capacitor close to each MFX pins:
VDD, VDD 1, VDD 2, VDD 3
SH2
STS9P2UH7
T8
SH1
STS9P2UH7
T6
CAL
SH0_D
3V_MFX
1
2
3
5
6
7
8
3V_MFX
1
2
3
Sheet: 4 of 10
Revision: C-01
Title: IDD measurement / MFX (Multi Function eXpander)
3V_MFX
4
STS9P2UH7
T4
SH0
STS9P2UH7
T2
Note *: two footprints superimposed allows to
also populate with SO-8 package.
(STS9P2UH7 P MOS transistors)
C40
1uF_X5R_10%_0603
U11B
TSZ122IST
R51
7
IDD_MEAS
100_1%_0402
300K_1%_0402
R42
1
2
3
4
decoupling capacitors
close to TSZ122
C39
100nF_X7R_10%_0402
U11A
TSZ122IST
1
CN5
LAYOUT PROPOSAL DRAWING
100nF_X7R_10%_0402
R27
0_5%_0402
IDD_MEAS
CAL
SH0
SH1
SH2
U8
18 MFX_V2
19
20
39
40
15
16
17
29
30
31
32
33
26
27
28
decoupling capacitors
C36
close to TSZ122
100nF_X7R_10%_0402
R94
SH2_D
100K_1%_0402
1
2
5
6
4
3V
MFX_V2
TSC_XP/GPO0
TSC_XN/GPO1
TSC_XN
XN/GPO1
TSC_YP/GPO2
TSC_YN/GPO3
TSC_YN
YN/GPO3
SPARE
SPAR
ARE
C33
100nF_X7R_10%_0402
R29
45
10K_1%_0402
21
22
MFX_USART3_TX
T5
STT7P2UH7
see note *
S
G
MFX_I2C_SDA
MFX_I2C_SCL
MFX_USART3_TX
MFX_USART3_RX
R34
100K_1%_0402
3V_MFX
MFX_I2C_SDA
MFX_I2C_SCL
MFX_WAKEUP
SH0
PB11
PB10
PA4
[NA]
BAT60JFILM
4
3V_MFX
R35
NRST D5
MFX_IRQ_OUT
1uF_POL_10%_TANA C34
Ferrite
L2
3
1
2
5
6
NRST
G
S
D
3
S
D
MFX_IRQ_OUT
1
G
S
PC13
2
G
24
36
48
1
VDD_1
VDD_2
VDD_3
VDD
V
VD
D
9
VDDA
VSS_1
VSS_2
VSS_3
VSSA
23
35
47
8
D
8
4
8
4
S
G
S
D
G
G
D
S
D
S
DocID027676 Rev 2
G
28/39
D
3V_MFX
Schematics
UM1879
Figure 13. IDD measurement / MFX (Multi Function eXpander)
PB7
PB6
DocID027676 Rev 2
PA1
PA5
PA2
PA3
PA0
I2C1_SDA
I2C1_SCL
JOY_LEFT
JOY_DOWN
JOY_RIGHT
JOY_UP
3V
2
4
6
8
SSM-104-L-DH
1
3
5
7
R54
R58
R56
R52
5V
0_5%_0402
0_5%_0402
0_5%_0402
0_5%_0402
SB2
EXT_RST
Input pins with pull-down
JOY_LEFT
JOY_DOWN
JOY_RIGHT
JOY_UP
JOY_CENTER
USER & WAKE-UP Button
JOY_CENTER
I2C1_SDA
I2C1_SCL
CN2
PD0
3V
LD_G
LD_R
R59
10K_1%_0402
PE8
PB2
1
3
6
4
2
5
LEFT
DOWN
RIGHT
UP
1
CENTER
COMMON
B2
330_1%_0402
LED, green
1K_1%_0402
LED, red
LD5
R46
R45
100_1%_0402
R53
LD_G
LD_R
MT-008A
C41
100nF_X7R_10%_0402
C44
100nF_X7R_10%_0402
C46
100nF_X7R_10%_0402
C42
100nF_X7R_10%_0402
C43
100nF_X7R_10%_0402
R55 10K_1%_0402
EXT_RST
LD4
3
2
4
Joystick
6
NRST
100nF
C45
Reference: MB1184
Date: 6/15/2015
Size: A4
Project: STM32L476G-DISCO
R57
10K_1%_0402
Sheet: 5 of 10
Revision: C-01
Title: Joystick, ACP, LEDs and Push Button
RESET Button
NRST
SB23
4
1
3
2
EXT/RF E2P Connector
3V
B1
SW-PUSH-CMS_BLACK
Not Fitted
UM1879
Schematics
Figure 14. Joystick ACP, LEDs and pushbutton
29/39
38
SEG[0..23]
COM[0..3]
SEG[0..23]
COM[0..3]
28
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
27
SEG16
SEG15
SEG14
SEG13
SEG12
COM0
COM1
SEG23
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
1
SEG0
26
SEG22
2
SEG1
25
SEG21
3
SEG2
24
SEG20
4
SEG3
23
SEG19
5
SEG4
22
SEG18
SEG5
6
SEG17
7
SEG6
20
SEG16
8
SEG7
19
SEG15
COM2
COM3
SEG11
SEG10
SEG9
SEG8
SEG7
9
SEG8
18
SEG14
10
SEG13
11
SEG9
16
SEG10
17
SEG12
SEG11
12
COM0
COM3
15
COM1
COM2
13
DocID027676 Rev 2
14
30/39
21
LCD
U5
GH08172T
Socket DIP28
U100
Title: LCD Display
Reference: MB1184
Date: 6/15/2015
Size: A4
Project: STM32L476G-DISCO
Sheet: 6 of 10
Revision: C-01
Schematics
UM1879
Figure 15. LCD display
OTG_FS_VBUS
OTG_FS_DM
OTG_FS_DP
OTG_FS_ID
OTG_FS_PowerSwitchOn
PC11
PA11
PA12
PC12
PC9
0_5%_0402
R64
0_5%_0402
R61
10K_1%_0402
B3
C3
D3
A2
B2
5V
R62
3V3_REG
GND FAULT
IN
OUT
EN
22
22
EMIF02-USB03F2
GND
ID
D+in
D-in
Pd1
Pd2
R67
R68
D2
A3
C1
D1
B1
C2
STMPS2141STR
Vbus
D+out
D-out
Dz
Pup
U15
2
5
4
U14
3
1
47K_1%_0402
C67
4.7uF
R72
47K_1%_0402
0_5%_0402
R66
LD7
LED, red
R73
620_1%_0603
[NA]
R63
1
R65
6
1
2
3
4
5
T10
9013-SOT23
LD6
LED, green
PC10
Reference: MB1184
Date: 6/15/2015
Size: A4
Project: STM32L476G-DISCO
Title: OTG USB FS
USB-MICRO-AB
Shield
VBUS
DM
DP
ID
GND
CN7
OTG_FS_OverCurrent
R71
330_1%_0603
3V3_REG
3
DocID027676 Rev 2
2
USB_Micro-AB receptacle
3V3_REG
Sheet: 7 of 10
Revision: C-01
UM1879
Schematics
Figure 16. OTG USB FS
31/39
38
32/39
C70
100nF_X7R_10%_0402
C69
100nF_X7R_10%_0402
3V
DocID027676 Rev 2
5
1
[NA]
R75
LR
CLK
DOUT
MP34DT01
GND
VDD
U17
3V
2
3
4
AUDIO_CLK
AUDIO_DIN
0_5%_0402
R77
PE9
AUDIO_CLK
PE7
AUDIO_DIN
GND
PE2
PE5
PE6
PE4
PE3
PB7
PB6
SAI1_MCK
SAI1_SCK
SAI1_SD
SAI1_FS
AUDIO_RST
I2C1_SDA
I2C1_SCL
R60
10K_1%_0402
12
10
11
37
38
39
40
32
1
2
3
20
36
33
35
41
2V5
13
16
34
C57
C68
1uF_POL_10%_TANA
C65
100nF_X7R_10%_0402
C62
100nF_X7R_10%_0402
C51
3V
100nF_X7R_10%_0402
C52
100nF_X7R_10%_0402
1uF_X5R_10%_0603
C56
1uF_X5R_10%_0603
SAI1_MCK
SAI1_SCK
SAI1_SD
SAI1_FS
AUDIO_RST
I2C1_SDA
I2C1_SCL
CS43L22
I2C address 0x94
VQ
AFILTB
AFILTA
FILT+
AGND
AIN1B
AIN1A
AIN2B
AIN2A
AIN3B
AIN3A
AIN4B
AIN4A
SPKR_OUTA+
SPKR_OUTASPKR_OUTB+
SPKR_OUTBVP
VP
HP/LINE_OUTA
HP/LINE_OUTB
SPKR/HP
TSTO
TSTO
VL
DGND
GND/Thermal Pad
+VHP
VA
VD
FLYP
-VHPFILT
FLYN
MCLK
SCLK
SDIN
LRCK
RESET
SDA
SCL
A0
U13
3V
C60
1uF_X5R_10%_0603
C53
150pF_NPO_5%_0603
C59
150pF_NPO_5%_0603
C66
1uF_X5R_10%_0603
C58
100nF_X7R_10%_0402
C50
100nF_X7R_10%_0402
0_5%_0402
R76
Reference: MB1184
Date: 6/15/2015
Size: A4
Project: STM32L476G-DISCO
Sheet: 8 of 10
Revision: C-01
Title: Audio Codec and Microphone MEMS
19
28
27
18
17
30
29
26
25
24
23
22
21
4
6
7
9
8
5
15
14
31
R69
51_1%_0402
C64
C63
22nF_X7R_10%_0603 22nF_X7R_10%_0603
R70
51_1%_0402
3
1
ST-225-02
2 CN6
Schematics
UM1879
Figure 17. Audio DAC and microphone MEMS
PE12
PE13
PE14
PE15
PE11
PE10
QSPI_D0
QSPI_D1
QSPI_D2
QSPI_D3
QSPI_CS
QSPI_CLK
1
6
5
2
3
7
QSPI_CS
QSPI_CLK
QSPI_D0
QSPI_D1
QSPI_D2
QSPI_D3
VCC
N25Q128A13EF840E
4
8
10K_1%_0402
DQ0
DQ1
DQ2/Vpp/W#
DQ2/Vpp/W
V
#
DQ3/HOLD# VSS
S#
C
U16
R74
3V
C61
100nF_X7R_10%_0402
Quad SPI Flash Memory
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Reference: MB1184
Date: 6/15/2015
Size: A4
Project: STM32L476G-DISCO
Title: Quad SPI Flash Memory
Revision: C-01
Sheet: 9 of 10
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Schematics
Figure 18. Quad-SPI Flash memory
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PD4
R23
XL_CS
MAG_CS
MEMS_SCK
MEMS_MOSI
MEMS_MISO
GYRO_CS
GYRO_INT2
GYRO_INT1
MEMS_MOSI
PD1
PE0
PC0
PD1
PD4
PD3
PD7
PB8
PD2
C17
100nF_X7R_10%_0402
1K_1%_0402
MEMS_SCK
XL_CS
MAG_CS
MEMS_SCK
MEMS_MOSI
MEMS_MISO
GYRO_CS
GYRO_INT2
GYRO_INT1
1
2
3
4
5
6
1
2
3
4
5
6
7
8
VDD
VDD
C1
GND
GND
GND
GND
GND
LSM303CTR
SCL/SPC
INT_XL
CS_XL
DRDY_MAG
CS_MAG
VDD_IO
SDA/SDI/SDO
VDD
C1
GND
GND
INT_MAG
U6
MEMS
L3GD20
VDD_IO
SCL/SPC
SDA/SDI/SDO
SA0/SDO
CS_I2C/SPI
DRDY/INT2
INT1
GND
U7
12
11
10
9
8
7
16
15
14
13
12
11
10
9
3V
PC1
XL_INT
XL_INT
MAG_DRDY
MAG_DRDY
3V
C21
10uF_X5R_10%_0603
C16
100nF_X7R_10%_0402
C22
100nF_X7R_10%_0402
MAG_INT
MAG_INT
C20
10nF_X7R_10%_0603
C19
100nF_X7R_10%_0402
C18
10uF_X5R_10%_0603
Reference: MB1184
Date: 6/15/2015
Size: A4
Project: STM32L476G-DISCO
Sheet: 10 of 10
Revision: C-01
Title: Gyroscope, Accelerometer, Magnetometer MEMS
PE1
PC2
Schematics
UM1879
Figure 19. Gyroscope, accelerometer, magnetometer MEMS
UM1879
Power consumption measurements
Appendix A
Power consumption measurements
The power consumption measurements of the STM32L476 discovery board are reflected in
Figure 20. Please note the GPIO configuration of the STM32L476VGT6 in Standby mode.
Figure 20. Power consumption tree
3V3_REG
JP6
Measured 287µA
287-115 => 172µA
3V3
172-92 => 80µA
Measured 92µA
Measured 115 µA
D6
For IDD
TSZ122
1st stage
SB28
V+ : ~11µA due to resistors bridge
V- : ~11µA due to resistors bridge
3V
LDO
/'
115-70 => 45µA
Measured 70µA
Audio
DAC&6
03
QuadSPI
14
L3GD20
LSM303
CTR
R30
3V_MFX
70-0.4 => 69.6µA
MFX
STM32L152
For IDD
TSZ122
2nd stage
Measured 0.4µA
V+ : ~10µA due to resistors bridge
JP5
VDD_MCU
STM32L476VGT6
STM32L476VGT6 GPIOs are configured in ‘Analog input’ except:
PWR->PUCRA = 0; // no PU on GPIOA
PWR->PDCRA = 0x2F; // PD on GPIOA[0,1,2,3,5]
PWR->PUCRB = 0; // no PU on GPIOB
PWR->PDCRB = 0; // no PD on GPIOB
PWR->PUCRC = 0x1; // PU on GPIOC[0] MAG_CS
PWR->PDCRC = 0x800; // PD on GPIOC[11]
PWR->PUCRD = 0x80; // PU on GPIOD[7] MEMS_SPI_CS
PWR->PDCRD = 0x12; // no PD on GPIOD[1,4] MEMS_SPI_CLK, MEMS_SPI_MOSI
PWR->PUCRE = 0x0001; // PU on GPIOE[0] XL_CS
PWR->PDCRE = 0x0200; // PD on GPIOE[9] AUDIO_CLK for DMIC
PWR->PDCRE|= 0x0074; // PD on GPIOE[2,4,5,6] SAI1 interface to CODEC
PWR->PDCRE|= 0xF400; // PD on GPIOE[10,12,13,14,15] QuadSPI CLK, D0,D1,D2,D3
PWR->PUCRF = 0; // no PU on GPIOF
PWR->PDCRF = 0; // no PD on GPIOF
PWR->PUCRG = 0; // no PU on GPIOG
PWR->PDCRG = 0; // no PD on GPIOG
PWR->PUCRH = 0; // no PU on GPIOH
PWR->PDCRH = 0; // no PD on GPIOH
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Power consumption measurements
UM1879
The total power consumption of the STM32L476 discovery board measured is 287µA which
is as expected:
Table 8 gives for each peripheral the theoretical power consumption value. It’s extracted
from the vendor’s product datasheet. The typical values are given under the same
conditions as used for the power consumption measurement above. Please refer to those
product datasheets for more details about the conditions.
The theoretical total power consumption of the STM32L476 discovery board is ~295uA.
Table 8. Typical power consumption of the STM32L476 discovery board
MB1184-C01
component.
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Typical
theoretical
consumption
(uA)
Conditions
LD3985M25R_U12
85
On mode: VINH=1.2V
TSZ122IST_U10
58
Differential +
11
Current in R40+R42
Differential -
11
Current in R47+R50
CS43L22_U13
0
Reset pin 32 and all clocks and lines are hold Low
MP34DT01_U17
33
IddPdn, input clock in static mode
N25Q128A13EF840E_U16
14
Standby current
L3GD20_U7
5
IddPdn, Supply current in power-down mode
LSM303CTR_U6
10
IddPdn, current consumption in power-down mode
TSZ122IST_U11
58
Bridge Op Amp
10
Current in R48+R49
MFX_U8
0.3
Standby mode. All GPIOs in ‘Analog Input’ except
WAKEUP input with external PD (R34)
STM32L476VGT6_U9
0.3
Standby mode, GPIOs configuration described
above
TOTAL STM32L476
discovery
295.6
-
-
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-
UM1879
Appendix B
Mechanical drawing
Mechanical drawing
Figure 21. STM32L476 discovery board mechanical drawing
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Revision history
UM1879
Revision history
Table 9. Document revision history
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Date
Revision
Changes
17-Jul-2015
1
Initial release.
04-Aug-2015
2
Added Section 5: Bootloader limitations.
DocID027676 Rev 2
UM1879
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