4.2.1 Xplained Pro Standard Extension Headers
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 4-2 and Table 4-3.
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 |