The extension connector marked with "Host I2C" targets I2C hosts that want to connect to the SAM G53 high speed I2C slave interface. Besides I2C communication a GPIO and the SAM G53 reset is available. The GPIO can serve as an IRQ to the host and the reset can be used by the host to reset the SAM G53.
| Pin on I2C header | SAM G53 pin | SAM G53 peripheral function | Shared functionality |
|---|---|---|---|
| 1 | - | - | |
| 2 | - | - | |
| 3 | PA23 | GPIO | |
| 4 | RESET | Reset | |
| 5 | PA03 | TWD0 | |
| 6 | PA04 | TWCK0 | |
| 7 | - | - | VCC |
| 8 | - | - | GND |