The extension connector marked with "Host I2C" targets I2C hosts that want to connect to the SAM G55 high speed I2C slave interface. Besides I2C communication, a GPIO and the SAM G55 reset are available. The GPIO can serve as a IRQ to the host and the reset can be used by the host to reset the SAM G55.
| Pin on I2C Connector | Pin on SAM G55 | SAM G55 Peripheral Function | Shared Functionality |
|---|---|---|---|
| 1 | - | - | |
| 2 | PA01 | NCHG | TIOB0 |
| 3 | PA16 | GPIO | WKUP7 |
| 4 | RESET | Reset | |
| 5 | PA03 | TWD0 | |
| 6 | PA04 | TWCK0 | |
| 7 | - | - | VCC |
| 8 | - | - | GND |