Exp Header Pinout - Silicon Laboratories EFR32xG21B User Manual

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.
Pin Connection
20 3V3
18 5V
16 NC
14 PA06
12 PA05
10 PC03
8 PC02
6 PC01
4 PC00
2 VMCU
19 BOARD_ID_SDA
17 BOARD_ID_SCL
15 NC
13 PD03
11 PD02
9 PB01
7 PB00
5 NC
3 NC
1 GND
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UG428: EFR32xG21B 2.4 GHz 10 dBm Wireless Starter Kit User's Guide
Table 3.1. EXP Header Pinout
EXP Header Function
Board controller supply
Board USB voltage
I2C_SDA
UART_RX
UART_TX
SPI_CS
SPI_SCLK
SPI_MISO
SPI_MOSI
EFR32 voltage domain, included in AEM measurements.
Connected to board controller for identification of add-on boards.
Connected to board controller for identification of add-on boards.
I2C_SCL
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
Ground
Shared Feature
VCOM_RX
VCOM_TX
DISP_SCS
DISP_SCLK
VCOM_RTS
DISP_MOSI
UIF_LED1
UIF_LED0
UIF_BUTTON1
UIF_BUTTON0
Connectors
Peripheral Mapping
USART0_RX
USART0_TX
USART0_CS
USART0_SCLK
USART0_RTS
USART0_MOSI
Rev. 1.0 | 10