It's a PID block to be configured with I2C. GPIOs 7 through 2 are for error/control, and GPIOs 1 and 0 are SDA and SCL.
Configure with the I2C frame, see the I2C files for the "addresses". See the I2C test file for an example.
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | segment a | Error/Control | |
| 1 | segment b | Error/Control | |
| 2 | segment c | Error/Control | |
| 3 | segment d | Error/Control | |
| 4 | segment e | Error/Control | |
| 5 | segment f | Error/Control | |
| 6 | segment g | SDA | |
| 7 | dot | SCL |