The trackpad is mounted onto the PCA63519 board and connected to the P12 connector.
Figure 1. Trackpad interface connector
The trackpad is interfaced through the two-wire bus interface. See the table below for the trackpad pin description:
| Pin | Label | Description |
|---|---|---|
| 1 | NC | Not connected |
| 2 | WU_IRQ_TP | Interrupt from trackpad |
| 3 | GND | Ground |
| 4 | I2C_CLK_TP | Two-wire serial clock |
| 5 | I2C_DATA_TP | Two-wire serial data |
| 6 | 3V3 | Power supply for trackpad |
The trackpad requires a stable 3.3 V supply (see Voltage regulator for the trackpad for details). Because of this the signals going from the nRF device to the trackpad need to be level-shifted.
Figure 2. Level translation circuit for the trackpad
