Silicon Labs UG257 User's Guide

Silicon Labs UG257 User's Guide
UG257: EFM32 Pearl Gecko PG12 Starter
Kit User's Guide
The SLSTK3402A Starter Kit is an excellent starting point to get
familiar with the EFM32™ Pearl Gecko PG12 Microcontroller.
The Starter Kit contains sensors and peripherals demonstrating some of the Pearl Gecko
PG12's many capabilities. The kit provides all necessary tools for developing an EFM32
Pearl Gecko PG12 application.
TARGET DEVICE
• EFM32 Pearl Gecko PG12 Microcontroller
(EFM32PG12B500F1024GL125)
• CPU: 32-bit ARM® Cortex-M4® with FPU
• Memory: 1024 kB flash and 256 kB RAM
KIT FEATURES
• USB connectivity
• Advanced Energy Monitor
• SEGGER J-Link on-board debugger
• Debug Multiplexer supporting external
hardware as well as on-board MCU
• Silicon Labs' Si7021 Relative Humidity
and Temperature sensor
• Ultra low power 128x128 pixel Memory
LCD
• User LEDs / Pushbuttons
• Inductive LC sensor
• Capacitive touch slider
• 20-pin 2.54 mm header for expansion
boards
• Breakout pads for direct access to I/O pins
• Power sources include USB and CR2032
coin cell battery.
SOFTWARE SUPPORT
• Simplicity Studio™
• Energy Profiler
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Introduction
1. Introduction
1.1 Description
The SLSTK3402A is an excellent starting point to get familiar with the EFM32 Pearl Gecko PG12 Microcontrollers. The kit contains
sensors and peripherals demonstrating some of the MCU's many capabilities. The kit can also serve as a starting point for application
development.
In additon to supporting application development on the starter kit itself, the board is also a fully featured debugger and energy monitoring tool that can be used with external applications.
1.2 Features
•
•
•
•
•
•
•
•
•
•
•
•
EFM32PG12B500F1024GL125 MCU with 1024 kB Flash and 256 kB RAM.
Advanced Energy Monitoring system for precise current and voltage tracking.
Integrated Segger J-Link USB debugger/emulator with the possiblity to debug external Silicon Labs devices.
20 pin expansion header.
Breakout pads for easy access to I/O pins.
Power sources including USB and CR2032 battery.
Silicon Labs Si7021 Relative Humidity and Temperature Sensor
Ultra low power 128x128 pixel Memory-LCD
2 push buttons and 2 LEDs connected to EFM32 for user interaction
LC tank circuit for inductive sensing
4-segment capacitive touch slider
Crystals for LFXO and HFXO: 32.768 kHz and 40.000 MHz.
1.3 Getting Started
Hardware
To set up the hardware for the SLSTK3402A kit:
1. Provide power to the board by connecting the DBG USB connector to the PC using the provided mini-USB cable.
2. Ensure that the power selector switch is in the AEM position.
Software
Detailed instructions for how to get started with your new SLSTK3402A can be found on the Silicon Labs web pages:
http://www.silabs.com/simplicity
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Kit Block Diagram
2. Kit Block Diagram
An overview of the EFM32 Pearl Gecko PG12 Starter Kit is shown in the figure below.
128 x 128 pixel
Memory LCD
SPI
USB Mini-B
Connector
GPIO
EXP Header
Board
Controller
DEBUG
Si7021
I2C
UART
User Buttons
& LEDs
LESENSE
LC Sensor
CSEN
GPIO
EFM32PG12
MCU
Temperature
& Humidity
Sensor
Capacitive Touch Slider
Figure 2.1. Kit Block Diagram
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Kit Hardware Layout
3. Kit Hardware Layout
The layout of the EFM32 Pearl Gecko PG12 Starter Kit is shown below.
Debug Connector
128x128 Pixel
Memory LCD
Simplicity Connector
Relative Humidity &
Temperature Sensor
Kit "Debug" USB
Connector
EFM32PG12 MCU
Expansion Header
CR2032
Battery Holder
EFM32 Reset Button
Inductive LC Sensor
Power Source Select
User Push
Buttons
User LEDs
Capacitive Touch Slider
Figure 3.1. SLSTK3402A Hardware Layout
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Connectors
4. Connectors
4.1 Breakout Pads
Most of the EFM32's GPIO pins are available on two pin header rows at the top and bottom edges of the board. These have a standard
2.54 mm pitch, and pin headers can be soldered in if required. In addition to the I/O pins, connections to the different power rails and
ground are also provided. Note that some of the pins are used for kit peripherals or features, and may not be available for a custom
application without trade-offs.
5V
GND
BDEN
RST
PF0
PF1
PF2
PF3
PI0
PI1
PI2
PI3
PJ14
PJ15
GND
3V3
The figure below shows the pinout of these "breakout pads", as well as the pinout of the "Expansion Header" situated on the right-hand
side of the board. The expansion header is further explained in the next section. The breakout pad connections are also printed in silk
screen next to each pin for easy reference.
5V
GND
PF4
PF5
PF6
PF7
PF8
PF9
PF10
PF11
PF12
PF13
PF14
PF15
GND
3V3
J102
Debug
Connector
Simplicity
Connector
J 102
EXP Header
3V3
5V
PC10
PD11
PD10
PA9
PA8
PA7
PA6
VMCU
Board ID SDA
Board ID SCL
PC11
PD8
PB8
PB7
PB6
PD9
PC9
GND
VMCU
GND
PC4
PC5
PC6
PC7
PC8
PD12
PD13
PD14
PD15
PK0
PK1
PK2
GND
3V3
J 101
VMCU
GND
PA0
PA1
PA2
PA3
PA4
PA5
PB9
PB10
PB11
PB12
PB13
NC
GND
3V3
J101
Figure 4.1. Breakout Pads and Expansion Header
The table below shows the connections of each pin of the breakout pads. They also show which kit peripherals or features are connected to the different pins.
Table 4.1. Bottom Row (J101) Pinout
Pin
EFM32
I/O pin
Shared feature
Pin
EFM32
I/O pin
Shared feature
1
VMCU
EFM32 voltage domain
2
VMCU
EFM32 voltage domain
3
GND
Ground
4
GND
Ground
5
PA0
VCOM_TX
6
PC4
7
PA1
VCOM_RX
8
PC5
9
PA2
VCOM_CTS
10
PC6
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Connectors
Pin
EFM32
I/O pin
Shared feature
Pin
EFM32
I/O pin
11
PA3
VCOM_RTS
12
PC7
13
PA4
LES_LC_SENSE
14
PC8
DISP_SCLK
15
PA5
VCOM_ENABLE
16
PD12
DAC_LC_EXCITE
17
PB9
18
PD13
DISP_COM
19
PB10
20
PD14
DISP_CS
21
PB11
22
PD15
DISP_ENABLE
23
PB12
24
PK0
25
PB13
26
PK1
27
-
Not connected
28
PK2
29
GND
Ground
30
GND
Ground
31
3V3
Board controller supply
32
3V3
Board controller supply
SENSOR_ENABLE
Shared feature
Table 4.2. Top Row (J102) Pinout
Pin
EFM32
I/O pin
Shared feature
Pin
EFM32
I/O pin
Shared feature
1
5V
Board USB voltage
2
5V
Board USB voltage
3
GND
Ground
4
GND
Ground
5
PF4
UIF_LED0
6
BDEN
BOD_ENABLE
7
PF5
UIF_LED1
8
RST
DEBUG_RESETn
9
PF6
UIF_BUTTON0
10
PF0
DEBUG_TCK_SWCLK
11
PF7
UIF_BUTTON1
12
PF1
DEBUG_TMS_SWDIO
13
PF8
DEBUG_TRACECLK
14
PF2
DEBUG_TDO_SWO
15
PF9
DEBUG_TRACED0
16
PF3
DEBUG_TDI
17
PF10
DEBUG_TRACED1
18
PI0
19
PF11
DEBUG_TRACED2
20
PI1
21
PF12
DEBUG_TRACED3
22
PI2
23
PF13
24
PI3
25
PF14
26
PJ14
27
PF15
28
PJ15
29
GND
Ground
30
GND
Ground
31
3V3
Board controller supply
32
3V3
Board controller supply
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Connectors
4.2 Expansion Header
On the right hand side of the board an angled 20 pin expansion header is provided to allow connection of peripherals or plugin boards.
The connector contains a number of I/O pins that can be used with most of the EFM32 Pearl Gecko PG12's features. Additionally, the
VMCU, 3V3 and 5V power rails are also exported.
The connector follows a standard which ensures that commonly used peripherals such as an SPI, a UART and an I2C bus are available
on fixed locations in the connector. The rest of the pins are used for general purpose I/O. This allows the definition of expansion boards
that can plug into a number of different Silicon Labs starter kits.
The figure below shows the pin assignment of the expansion header for the EFM32 Pearl Gecko PG12 Starter Kit. Because of limitations in the number of available GPIO pins, some of the expansion header pins are shared with kit features.
3V3
5V
PC10
PD11
PD10
PA9
PA8
PA7
PA6
VMCU
20
18
16
14
12
10
8
6
4
2
19
17
15
13
11
9
7
5
3
1
Board ID SDA
Board ID SCL
PC11
PD8
PB8
PB7
PB6
PD9
PC9
GND
TARGET I/O Pin
Reserved (Board Identification)
Figure 4.2. Expansion Header
Table 4.3. EXP Header Pinout
Pin
Connection
EXP Header function
20
3V3
Board controller supply
18
5V
Board USB voltage
16
PC10
I2C_SDA
14
PD11
UART_RX
LEU0_RX #18
12
PD10
UART_TX
LEU0_TX #18
10
PA9
SPI_CS
USART2_CS #1
8
PA8
SPI_SCLK
USART2_CLK #1
6
PA7
SPI_MISO
USART2_RX #1
4
PA6
SPI_MOSI
USART2_TX #1
2
VMCU
EFM32 voltage domain, included in AEM measurements.
19
BOARD_ID_SDA
Connected to Board Controller for identification of add-on boards.
17
BOARD_ID_SCL
Connected to Board Controller for identification of add-on boards.
15
PC11
I2C_SCL
13
PD8
GPIO
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Shared feature
Peripheral mapping
SENSOR_I2C_SDA
I2C0_SDA #15
SENSOR_I2C_SCL
I2C0_SCL #15
USART3_CS #29
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Connectors
Pin
Connection
EXP Header function
11
PB8
GPIO
9
PB7
GPIO
I2C1_SCL #6
USART3_RX #10
7
PB6
GPIO
I2C1_SDA #6
USART3_TX #10
5
PD9
GPIO
3
PC9
GPIO
1
GND
Ground
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Shared feature
Peripheral mapping
USART3_CLK #10
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Connectors
4.3 Debug Connector (DBG)
The Debug Connector serves a dual purpose. Based on the "debug mode", which can be set up using Simplicity Studio. In the "Debug
IN" mode this connector allows an external debug emulator to be used with the on-board EFM32. In the "Debug OUT" mode this connector allows the kit to be used as a debugger towards an external target. In the "Debug MCU" (default) mode this connector is isolated
from the debug interface of both the Board Controller and the on-board target device.
Because this connector is automatically switched to support the different operating modes, it is only available when the Board Controller
is powered (J-Link USB cable connected). If debug access to the target device is required when the Board Controller is unpowered, this
should be done by connecting directly to the appropriate breakout pins.
The pinout of the connector follows that of the standard ARM Cortex Debug+ETM 19-pin connector. The pinout is described in detail
below. Note that even though the connector has support for both JTAG and ETM Trace in addition to Serial Wire Debug, it does not
necessarily mean that the kit or the on-board target device supports this.
VTARGET
GND
GND
NC
Cable Detect
NC
NC
GND
GND
GND
1
5
7
9
11
13
15
17
19
3
2
4
6
8
10
12
14
16
18
20
TMS / SWDIO / C2D
TCK / SWCLK / C2CK
TDO / SWO
TDI / C2Dps
RESET / C2CKps
TRACECLK
TRACED0
TRACED1
TRACED2
TRACED3
Figure 4.3. Debug Connector
Note that the pin-out matches the pin-out of an ARM Cortex Debug+ETM connector, but these are not fully compatible as pin 7 is physically removed from the Cortex Debug+ETM connector. Some cables have a small plug that prevent them from being used when this pin
is present. If this is the case, remove the plug, or use a standard 2x10 1.27 mm straight cable instead.
Table 4.4. Debug Connector Pin Descriptions
Pin number(s)
Function
Note
1
VTARGET
Target reference voltage. Used for shifting logical signal levels between target and
debugger.
2
TMS / SDWIO / C2D
JTAG test mode select, Serial Wire data or C2 data
4
TCK / SWCLK / C2CK
JTAG test clock, Serial Wire clock or C2 clock
6
TDO/SWO
JTAG test data out or Serial Wire Output
8
TDI / C2Dps
JTAG test data in, or C2D "pin sharing" function
10
RESET / C2CKps
Target device reset, or C2CK "pin sharing" function
12
TRACECLK
ETM Trace Clock
14
TRACED0
ETM Trace Data 0
16
TRACED1
ETM Trace Data 1
18
TRACED2
ETM Trace Data 2
20
TRACED3
ETM Trace Data 3
9
Cable detect
Connect to ground
11, 13
NC
Not connected
3, 5, 15, 17, 19
GND
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Connectors
4.4 Simplicity Connector
The Simplicity Connector featured on the Starter Kit enables advanced debugging features such as the AEM and the Virtual COM port
to be used towards an external target. The pinout is illustrated in the figure below.
VMCU
3V3
5V
GND
GND
GND
GND
GND
Board ID SCL
Board ID SDA
1
3
5
7
9
11
13
15
17
19
2 Virtual COM TX
4 Virtual COM RX
6
8
10
12
14
16
18
20
Virtual COM CTS
Virtual COM RTS
NC
NC
NC
NC
NC
NC
Figure 4.4. Simplicity Connector
Note: Current drawn from the VMCU voltage pin is included in the AEM measurements, while the 3V3 and 5V voltage pins are not. To
monitor the current consumption of an external target with the AEM, put the on-board MCU in its lowest energy mode to minimize its
impact on the measurements.
Table 4.5. Simplicity Connector Pin Descriptions
Pin number(s)
Function
Description
1
VMCU
3.3 V power rail, monitored by the AEM
3
3V3
3.3 V power rail
5
5V
5 V power rail
2
VCOM_TX
Virtual COM Tx
4
VCOM_RX
Virtual COM Rx
6
VCOM_CTS
Virtual COM CTS
8
VCOM_RTS
Virtual COM RTS
17
EXT_ID_SCL
Board ID SCL
19
EXT_ID_SDA
Board ID SDA
10, 12, 14, 16, 18, 20
NC
Not connected
7, 9, 11, 13, 15
GND
Ground
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Power Supply and Reset
5. Power Supply and Reset
5.1 MCU Power Selection
The EFM32 on the Starter Kit can be powered by one of these sources:
• The debug USB cable; or
• a 3 V coin cell battery.
5V
USB Mini-B
Connector
LDO
3.3 V
Advanced
Energy
Monitor
M
AE
BA
T
The power source for the MCU is selected with the slide switch in the lower left corner of the Starter Kit. Figure 5.1 Power Switch on
page 10 shows how the different power sources can be selected with the slide switch.
AEM
VMCU
BAT
3V Lithium Battery
(CR2032)
EFM32
Figure 5.1. Power Switch
With the switch in the AEM position, a low noise 3.3 V LDO on the Starter Kit is used to power the EFM32. This LDO is again powered
from the debug USB cable. The Advanced Energy Monitor is now connected in series, allowing accurate high speed current measurements and energy debugging/profiling.
With the switch in the BAT position, a 20 mm coin cell battery in the CR2032 socket can be used to power the device. With the switch
in this position no current measurements are active. This is the recommended switch position when powering the MCU with an external
power source.
Note: The Advanced Energy Monitor can only measure the current consumption of the EFM32 when the power selection switch is in
the AEM position.
5.2 Board Controller Power
The board controller is responsible for important features such as the debugger and the Advanced Energy Monitor, and is powered
exclusively through the USB port in the top left corner of the board. This part of the kit resides on a separate power domain, so a different power source can be selected for the target device while retaining debugging functionality. This power domain is also isolated to
prevent current leakage from the target power domain when power to the Board Controller is removed.
The board controller power domain is exclusively supplied by the J-Link USB cable, and is not influenced by the position of the power
switch.
The kit has been carefully designed to keep the board controller and the target power domains isolated from each other as one of them
powers down. This ensures that the target EFM32 device will continue to operate in the USB and BAT modes.
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Power Supply and Reset
5.3 EFM32 Reset
The EFM32 MCU can be reset by a few different sources:
• A user pressing the RESET button.
• The on-board debugger pulling the #RESET pin low.
• An external debugger pulling the #RESET pin low.
In addition to the reset sources mentioned above, the Board Controller will also issue a reset to the EFM32 when booting up. This
means that removing power to the Board Controller (plugging out the J-Link USB cable) will not generate a reset, but plugging the cable
back in will, as the Board Controller boots up.
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Peripherals
6. Peripherals
The starter kit has a set of peripherals that showcase some of the features of the EFM32.
Be aware that most EFM32 I/O routed to peripherals are also routed to the breakout pads. This must be taken into consideration when
using the breakout pads for your application.
6.1 Push Buttons and LEDs
The kit has two user push buttons marked BTN0 and BTN1. They are connected directly to the EFM32, and are debounced by RC
filters with a time constant of 1 ms. The buttons are connected to pins PF6 and PF7.
The kit also features two yellow LEDs marked LED0 and LED1, that are controlled by GPIO pins on the EFM32. The LEDs are connected to pins PF4 and PF5 in an active-high configuration.
PF4 (GPIO)
UIF_LED0
PF5 (GPIO)
UIF_LED1
PF6 (GPIO)
UIF_BUTTON0
PF7 (GPIO)
UIF_BUTTON1
User Buttons
& LEDs
EFM32
Figure 6.1. Buttons and LEDs
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Peripherals
6.2 Memory LCD-TFT Display
A 1.28-inch SHARP Memory LCD-TFT has been added to the board to enable interactive applications to be developed. The display has
a high resolution of 128 by 128 pixels, and consumes very little power. It is a reflective monochrome display, so each pixel can only be
light or dark, and no backlight is needed in normal daylight conditions. Data sent to the display is stored in the pixels on the glass, which
means no continous refreshing is required to maintain a static image.
The display interface consists of an SPI-compatible serial interface and some extra control signals. Pixels are not individually addressable, instead data is sent to the display one line (128 bits) at a time.
The Memory LCD-TFT display is shared with the kit Board Controller, allowing the Board Controller application to display useful information when the user application is not using the display. The user application always controls ownership of the display with the
DISP_ENABLE line:
• 0: The Board Controller has control of the display
• 1: The user application (EFM32) has control of the display
Power to the display is sourced from the target application power domain when the EFM32 controls the display, and from the Board
Controller's power domain when the DISP_ENABLE line is low. Data is clocked in on DISP_SI when DISP_CS is high, and the clock is
sent on DISP_SCLK. The maximum supported clock speed is 1.1 MHz.
DISP_COM is the "COM Inversion" line. It must be pulsed periodically to prevent static build-up in the display itself. Please refer to the
display application information for details on driving the display:
http://www.sharpmemorylcd.com/1-28-inch-memory-lcd.html
PC8 (US1_CLK #11)
PC6 (US1_TX #11)
PD14 (GPIO)
PD13 (GPIO)
DISP_COM
COM
PD15 (GPIO)
0: Board Controller controls display
1: EFM32 controls display
EFM32
Figure 6.2. 128x128 pixel Memory LCD
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Peripherals
6.3 Capacitive Touch Slider
A touch slider utilizing the capacitive touch capability of the EFM32 is available. It is located on the lower right side of the board, beneath the EFM32. It consists of four interleaved pads which are connected to PC0, PC1, PC2 and PC3.
PC0 (CSEN BUS 2Y/1X CH0)
PC1 (CSEN BUS 2X/1Y CH1)
PC2 (CSEN BUS 2Y/1X CH2)
UIF_TOUCH0
UIF_TOUCH1
UIF_TOUCH2
UIF_TOUCH3
PC3 (CSEN BUS 2X/1Y CH3)
Capacitive Touch Slider
EFM32
Figure 6.3. Touch Slider
The capacitive touch pads work by sensing changes in the capacitance of the pads when touched by a human finger. Sensing the
changes in capacitance is done by setting up the EFM32's analog capacitive sense peripheral (CSEN).
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Peripherals
6.4 Si7021 Relative Humidity and Temperature Sensor
The Si7021 I2C relative humidity and temperature sensor is a monolithic CMOS IC integrating humidity and temperature sensor elements, an analog-to-digital converter, signal processing, calibration data, and an I2C Interface. The patented use of industry-standard,
low-K polymeric dielectrics for sensing humidity enables the construction of low-power, monolithic CMOS Sensor ICs with low drift and
hysteresis, and excellent long term stability.
The humidity and temperature sensors are factory-calibrated and the calibration data is stored in the on-chip non-volatile memory. This
ensures that the sensors are fully interchangeable, with no recalibration or software changes required.
The Si7021 is available in a 3x3 mm DFN package and is reflow solderable. It can be used as a hardware- and software-compatible
drop-in upgrade for existing RH/ temperature sensors in 3x3 mm DFN-6 packages, featuring precision sensing over a wider range and
lower power consumption. The optional factory-installed cover offers a low profile, convenient means of protecting the sensor during
assembly (e.g., reflow soldering) and throughout the life of the product, excluding liquids (hydrophobic/oleophobic) and particulates.
The Si7021 offers an accurate, low-power, factory-calibrated digital solution ideal for measuring humidity, dew-point, and temperature,
in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms.
The I2C bus used for the Si7021 is shared with the Expansion Header. The temperature sensor is normally isolated from the I2C line.
To use the sensor, SENSOR_ENABLE (PB10) must be set high. When enabled, the sensor's current consumption is included in the
AEM measurements.
VMCU
VDD
PC11 (I2C0_SCL #15)
PC10 (I2C0_SDA #15)
PB10 (GPIO)
SENSOR_I2C_SCL
SCL
SENSOR_I2C_SDA
SDA
Si7021
Temperature
& Humidity
Sensor
SENSOR_ENABLE
0: I2C lines are isolated, sensor is not powered
1: Sensor is powered and connected
EFM32
Figure 6.4. Si7021 Relative Humidity and Temperature Sensor
Please refer to the Silicon Labs web pages for more information: http://www.silabs.com/humidity-sensors
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Peripherals
6.5 LC Sensor
In the bottom right corner of the board there is an inductive-capacitive sensor for demonstrating the low energy sensor interface (LESENSE). The LESENSE peripheral uses the voltage digital-to-analog converter (VDAC) to set up an oscillating current through the inductor, and then uses the analog comparator (ACMP) to measure the oscillation decay time. The oscillation decay time will be affected
by the presence of metal objects within a few millimeters of the inductor. For more information please refer to application note AN0029
Low Energy Sensor Interface - Inductive Sense
DAC_LC_EXCITE
LES_LC_SENSE
390uH
PA4 (ACMP0 BUS 3X/4Y CH12)
330pF
100nF
PD12 (VDAC0_OUT1ALT #0)
100R
1.5K
LC Sensor
EFM32
Figure 6.5. LC Metal Sensor
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Peripherals
6.6 Virtual COM Port
An asynchronous serial connection to the board controller is provided for application data transfer between a host PC and the target
EFM32. This eliminates the need for an external serial port adapter.
Isolation & Level Shift
PA0 (US0_TX #0)
PA1 (US0_RX #0)
PA2 (US0_CTS #30)
PA3 (US0_RTS #30)
PA5 (GPIO)
VCOM_TX
VCOM_RX
VCOM_CTS
Board
Controller
USB
or
ETH
Host
PC
VCOM_RTS
VCOM_ENABLE
EFM32
Figure 6.6. Virtual COM Port Interface
The Virtual COM port consists of a physical UART between the target device and the board controller, and a logical function in the
board controller that makes the serial port available to the host PC over USB or Ethernet. The UART interface consists of four pins and
an enable signal.
Table 6.1. Virtual COM Port Interface Pins
Signal
Description
VCOM_TX
Transmit data from the EFM32 to the board controller
VCOM_RX
Receive data from the board controller to the EFM32
VCOM_CTS
Clear to Send hardware flow control input, asserted by the board controller when it is ready to receive more data
VCOM_RTS
Request to Send hardware flow control output, asserted by the EFM32 when it is ready to receive more data
VCOM_ENABLE Enables the VCOM interface, allowing data to pass through to the board controller.
Note: The VCOM port is only available when the board controller is powered, which requires the J-Link USB cable to be inserted.
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Advanced Energy Monitor
7. Advanced Energy Monitor
7.1 Usage
The AEM (Advanced Energy Monitor) data is collected by the board controller and can be displayed by the Energy Profiler, available
through Simplicity Studio. By using the Energy Profiler, current consumption and voltage can be measured and linked to the actual
code running on the EFM32 in realtime.
7.2 Theory of Operation
In order to be able to accurately measure current ranging from 0.1 µA to 50 mA (114 dB dynamic range), a current sense amplifier is
utilized together with a dual gain stage. The current sense amplifier measures the voltage drop over a small series resistor, and the
gain stage further amplifies this voltage with two different gain settings to obtain two current ranges. The transition between these two
ranges occurs around 250 µA. Digital filtering and averaging is done within the Board Controller before the samples are exported to the
Energy Profiler application.
During startup of the kit, an automatic calibration of the AEM is performed. This calibration compensates for the offset error in the sense
amplifiers.
5V
LDO
Power Select
Switch
3.3V
4.7R
VMCU
Sense Resistor
Current Sense
Amplifier
EFM32
Peripherals
G0
AEM
Processing
Multiple Gain
Stages
G1
Figure 7.1. Advanced Energy Monitor
7.3 Accuracy and Performance
The Advanced Energy Monitor is capable of measuring currents in the range of 0.1 µA to 50 mA. For currents above 250 µA, the AEM
is accurate within 0.1 mA. When measuring currents below 250 µA, the accuracy increases to 1 µA. Even though the absolute accuracy
is 1 µA in the sub 250 µA range, the AEM is able to detect changes in the current consumption as small as 100 nA. The AEM produces
6250 current samples per second.
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
On-Board Debugger
8. On-Board Debugger
The SLSTK3402A contains an integrated debugger, which can be used to download code and debug the EFM32. In addition to programming the EFM32 on the kit, the debugger can also be used to program and debug external Silicon Labs EFM32, EFM8, EZR32
and EFR32 devices.
The debugger supports three different debug interfaces used with Silicon Labs devices:
• Serial Wire Debug, is used with all EFM32, EFR32 and EZR32 devices
• JTAG, which can be used with some newer EFR32 and EFM32 devices
• C2 Debug, which is used with EFM8 devices
In order for debugging to work properly, make sure you have the approriate debug interface selected that works with your device. The
debug connector on the board supports all three of these modes.
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
On-Board Debugger
8.1 Debug Modes
Programming external devices is done by connecting to a target board through the provided Debug IN/OUT Connector, and by setting
the debug mode to [Out]. The same connector can also be used to connect an external debugger to the EFM32 MCU on the kit, by
setting the debug mode to [In].
Selecting the active debug mode is done with a drop-down menu in the Kit Manager tool in Simplicity Studio.
Debug MCU: In this mode the on-board debugger is connected to the EFM32 on the SLSTK3402A.
Host
Computer
USB
Board
Controller
EFM32PG12
External
Hardware
DEBUG HEADER
Figure 8.1. Debug MCU
Debug OUT: In this mode, the on-board debugger can be used to debug a supported Silicon Labs device mounted on a custom board.
Host
Computer
USB
Board
Controller
EFM32PG12
External
Hardware
DEBUG HEADER
Figure 8.2. Debug OUT
Debug IN: In this mode, the on-board debugger is disconnected, and an external debugger can be connected to debug the EFM32 on
the SLSTK3402A.
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
On-Board Debugger
Host
Computer
USB
Board
Controller
EFM32PG12
External Debug Probe
DEBUG HEADER
Figure 8.3. Debug IN
Note: For "Debug IN" to work, the board controller on the kit must be powered throught the USB connector.
8.2 Debugging During Battery Operation
When the EFM32 is powered by battery and the J-Link USB is still connected, the on-board debug functionality is available. If the USB
power is disconnected, the Debug In mode will stop working.
If debug access is required when the target is running of another energy source, such as a battery, and the board controller is powered
down, the user should make direct connections to the GPIO used for debugging. This can be done by connecting to the appropriate
pins of the breakout pads. Some Silicon Labs kits provide a dedicated pin header for this purpose.
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Kit Configuration and Upgrades
9. Kit Configuration and Upgrades
The kit configuration dialog in Simplicity Studio allows you to change the J-Link adapter debug mode, upgrade its firmware and change
other configuration settings.
In the main window of the Simplicity Studio's Launcher perspective, the debug mode and firmware version of the selected J-Link adapter is shown. Click the 'Change' link next to any of them to open the kit configuration dialog.
Figure 9.1. Launcher Perspective Kit Info
Figure 9.2. Kit Configuration Dialog
9.1 Firmware Upgrades
Upgrading the kit firmware is done through Simplicity Studio. Simplicity Studio will automatically check for new updates on startup.
You can also use the kit configuration dialog for manual upgrades. Click the [Browse] button in the [Update Adapter] section to select
the correct file ending in ".emz". Then, click the [Install Package] button.
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Schematics, Assembly Drawings and BOM
10. Schematics, Assembly Drawings and BOM
The schematics, assembly drawings and bill of materials (BOM) for the hardware included in the EFM32 Pearl Gecko PG12 Starter Kit
are available through Simplicity Studio when the kit documentation package has been installed.
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Kit Revision History and Errata
11. Kit Revision History and Errata
11.1 Revision History
The kit revision can be found printed on the box label of the kit, as outlined in the figure below.
EFM32 Pearl Gecko PG12 Starter Kit
SLSTK3402A
13-03-17
115100140
A00
Figure 11.1. Revision Info
Table 11.1. Kit Revision History
Kit Revision
Released
Description
A00
2017-01-03
Initial Kit Revision.
11.2 Errata
There are no known errata at present.
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UG257: EFM32 Pearl Gecko PG12 Starter Kit User's Guide
Document Revision History
12. Document Revision History
Revision 1.00
2017-01-13
Initial document version.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Description .
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3. Kit Hardware Layout
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4. Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.1 Breakout Pads
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4.3 Debug Connector (DBG) .
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4.4 Simplicity Connector.
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5. Power Supply and Reset . . . . . . . . . . . . . . . . . . . . . . . . . .
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6. Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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7. Advanced Energy Monitor
7.1 Usage
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7.3 Accuracy and Performance .
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8. On-Board Debugger . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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8.1 Debug Modes .
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8.2 Debugging During Battery Operation .
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9. Kit Configuration and Upgrades . . . . . . . . . . . . . . . . . . . . . . .
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9.1 Firmware Upgrades .
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11. Kit Revision History and Errata . . . . . . . . . . . . . . . . . . . . . . .
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10. Schematics, Assembly Drawings and BOM
11.1 Revision History.
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Table of Contents
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11.2 Errata .
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25
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26
Table of Contents
27
12. Document Revision History
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Simplicity Studio
One-click access to MCU and
wireless tools, documentation,
software, source code libraries &
more. Available for Windows,
Mac and Linux!
IoT Portfolio
www.silabs.com/IoT
SW/HW
www.silabs.com/simplicity
Quality
www.silabs.com/quality
Support and Community
community.silabs.com
Disclaimer
Silicon Labs intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or
intending to use the Silicon Labs products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical"
parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Labs reserves the right to make changes
without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included
information. Silicon Labs shall have no liability for the consequences of use of the information supplied herein. This document does not imply or express copyright licenses granted
hereunder to design or fabricate any integrated circuits. The products are not designed or authorized to be used within any Life Support System without the specific written consent of
Silicon Labs. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant personal
injury or death. Silicon Labs products are not designed or authorized for military applications. Silicon Labs products shall under no circumstances be used in weapons of mass
destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons.
Trademark Information
Silicon Laboratories Inc.® , Silicon Laboratories®, Silicon Labs®, SiLabs® and the Silicon Labs logo®, Bluegiga®, Bluegiga Logo®, Clockbuilder®, CMEMS®, DSPLL®, EFM®, EFM32®,
EFR, Ember®, Energy Micro, Energy Micro logo and combinations thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZRadio®, EZRadioPRO®,
Gecko®, ISOmodem®, Precision32®, ProSLIC®, Simplicity Studio®, SiPHY®, Telegesis, the Telegesis Logo®, USBXpress® and others are trademarks or registered trademarks of Silicon
Labs. ARM, CORTEX, Cortex-M3 and THUMB are trademarks or registered trademarks of ARM Holdings. Keil is a registered trademark of ARM Limited. All other products or brand
names mentioned herein are trademarks of their respective holders.
Silicon Laboratories Inc.
400 West Cesar Chavez
Austin, TX 78701
USA
http://www.silabs.com
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