Silicon Laboratories EFR32xG22, User Manual

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3.4.1 EXP Header Pinout
The pin-routing on the EFR32 is very flexible, so most peripherals can be routed to any pin. However, many pins are shared between
the EXP header and other functions on the Wireless STK Mainboard. The table below includes an overview of the mainboard features
that share pins with the EXP header.
Table 3.1. EXP Header Pinout
Pin Connection EXP Header Function Shared Feature Peripheral Mapping
20 3V3 Board controller supply
18 5V Board USB voltage
16 NC I2C_SDA
14 PA06 UART_RX VCOM_RX USART1_RX
12 PA05 UART_TX VCOM_TX USART1_TX
10 NC SPI_CS
8 NC SPI_SCLK
6 NC SPI_MISO
4 NC SPI_MOSI
2 VMCU EFR32 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 NC I2C_SCL
13 NC GPIO
11 NC GPIO
9 PB01 GPIO UIF_LED0
7 PB00 GPIO UIF_BUTTON0
5 NC GPIO
3 NC GPIO
1 GND Ground
UG431: EFR32xG22 2.4 GHz 6 dBm QFN32 Wireless Starter Kit User's Guide
Connectors
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