QT2 Xplained Pro implements two Xplained Pro Standard Extension Header marked with EXT1 and EXT2 in silkscreen. These headers make it possible to connect the board to a Xplained Pro MCU board with a MCU featuring a PTC module. The pin-out definition for the extension headers can be seen in Table 1 and Table 2.
The X-sensors of the touch pad is available on both EXT1 and EXT2 header on the kit for supporting Xplained Pro MCU kits with and without the EXT2 header.
| Pin on EXT | Function | Description |
|---|---|---|
| 1 | ID | Communication line to ID chip. |
| 2 | GND | Ground |
| 3 | Y1 | Y-line 1 |
| 4 | Y2 | Y-line 2 |
| 5 | Y3 | Y-line 3 |
| 6 | Y4 | Y-line 4 |
| 7 | X1 | X-line 1 (For use with MCU kits without EXT2 header) |
| 8 | X2 | X-line 2 (For use with MCU kits without EXT2 header) |
| 9 | X3 | X-line 3 (For use with MCU kits without EXT2 header) |
| 10 | X4 | X-line 4 (For use with MCU kits without EXT2 header) |
| 11 | I2C SDA | |
| 12 | I2C SCL | |
| 13 | Not Connected | |
| 14 | Not Connected | |
| 15 | Not Connected | |
| 16 | Not Connected | |
| 17 | Not Connected | |
| 18 | Not Connected | |
| 19 | GND | Ground |
| 20 | VCC | Target supply voltage |
| Pin on EXT | Function | Description |
|---|---|---|
| 1 | Not Connected | |
| 2 | GND | Ground |
| 3 | X1 | X-line 1 (For use with MCU kits with EXT2 header) |
| 4 | X2 | X-line 2 (For use with MCU kits with EXT2 header) |
| 5 | X3 | X-line 3 (For use with MCU kits with EXT2 header) |
| 6 | X4 | X-line 4 (For use with MCU kits with EXT2 header) |
| 7 | PWM | PWM for IS31FL3728 |
| 8 | Not Connected | |
| 9 | Not Connected | |
| 10 | Not Connected | |
| 11 | Not Connected | |
| 12 | Not Connected | |
| 13 | Not Connected | |
| 14 | Not Connected | |
| 15 | Not Connected | |
| 16 | Not Connected | |
| 17 | Not Connected | |
| 18 | Not Connected | |
| 19 | GND | Ground |
| 20 | Not Connected |