Input/Output

Additional information on which pins can be used for which functions is available on the pin information page.


Note:

The Tracker SoM has shared A and D pins. In other words, pin A0 is the same physical pin as pin D0, and is also the SDA pin. The alternate naming is to simplify porting code from other device types.

Pin M8 Pin Function Function Analog In GPIO
A0 / D0 Wire SDA
A1 / D1 Wire SCL
A2 / D2 Serial1 CTS
A3 / D3 3 Serial1 RTS
A4 / D4 SPI MOSI
A5 / D5 SPI MISO
A6 / D6 SPI SCK
A7 / D7 SPI SS WKP
TX / D8 5 Serial1 TX Wire3 SCL
RX / D9 4 Serial1 RX Wire3 SDA

On the Tracker One and Tracker Carrier Board you must enable CAN_5V in order to use GPIO on M8 pins 3, 4, and 5 (A3, D8/TX/SCL, D9/RX/SDA). If CAN_5V is not powered, these pins are isolated from the MCU starting with version 1.1 of the Tracker One/Tracker Carrier Board (September 2020 and later). This is necessary to prevent an issue with shipping mode, see technical advisory note TAN002.