The nRF52832-QFAA has 32 generic I/Os available. All I/Os are used in this design and are organized as shown in table below.
| I/O | Label | Description |
|---|---|---|
| P0.00 | XL1 | 32.768 kHz crystal 1 |
| P0.01 | XL2 | 32.768 kHz crystal 1 |
| P0.02 | DEBUG_LED | Output for debug LED |
| P0.03 | KEYOUT_4 | Output to keypad column 4 |
| P0.04 | Buzzer | Output to buzzer |
| P0.05 | MIC_DOUT | Input from digital microphone |
| P0.06 | MIC_CLK | Clock signal for digital microphone |
| P0.07 | VIO_GYRO_SW | On/off switch for accelerometer and gyro |
| P0.08 | KEYOUT_2 | Output to keypad column 2 |
| P0.09 | NFC1 | NFC antenna |
| P0.10 | NFC2 | NFC antenna |
| P0.11 | KEYOUT_3 | Output to keypad column 3 |
| P0.12 | KEYOUT_0 | Output to keypad column 0 |
| P0.13 | I2C_DATA_2 | Two-wire 2 master data |
| P0.14 | I2C_CLK_2 | Two-wire 2 master clock |
| P0.15 | I2C_CLK | Two-wire 1 master clock |
| P0.16 | KEYIN_0 | Input from keypad row 0 |
| P0.17 | KEYIN_1 | Input from keypad row 1 |
| P0.18 | KEYIN_2 | Input from keypad row 2 |
| P0.19 | KEYIN_4 | Input from keypad row 4 |
| P0.20 | KEYOUT_6 | Output to keypad column 6 |
| P0.21 | IR_SIGNAL | Input IR signal |
| P0.22 | ICM-20608_INT | Motion tracking device interrupt |
| P0.23 | IR_REC | |
| P0.24 | IR_LED | Output for IR LED |
| P0.25 | KEYOUT_7 | Output to keypad column 7 |
| P0.26 | VIO_PDM_SW | On/off switch on power supply for digital microphones |
| P0.27 | KEYOUT_5 | Output to keypad column 5 |
| P0.28 | KEYOUT_1 | Output to keypad column 1 |
| P0.29 | KEYIN_3 | Input from keypad row 3 |
| P0.30 | LIS3DH_INT1 | Low power accelerometer interrupt 1 |
| P0.31 | I2C_DATA | Two-wire 1 master data |