User Guide

3.4.1 EXP Header Pinout
The pin-routing on the BGM220P is very flexible, so most peripherals can be routed to any pin. However, many pins are shared be-
tween 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 PB03 I2C_SDA SENSOR_SDA I2C0_SDA
14 PA06 UART_RX VCOM_RX USART1_RX
12 PA05 UART_TX VCOM_TX USART1_TX
10 PC03 SPI_CS USART0_CS
8 PC02 SPI_SCLK FLASH_SCLK, DISP_SCLK USART0_CLK
6 PC01 SPI_MISO FLASH_MISO USART0_RX
4 PC00 SPI_MOSI FLASH_MOSI, DISP_MOSI USART0_TX
2 VMCU BGM220P 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 PB02 I2C_SCL SENSOR_SCL I2C0_SCL
13 NC
11 NC
9 PB01 GPIO BUTTON1, LED1
7 PB00 GPIO BUTTON0, LED0
5 NC
3 NC
1 GND Ground
UG432: BGM220P Wireless Gecko Module Starter Kit User's Guide
Connectors
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