QT3 Xplained Pro Extension Headers

QT3 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 an Xplained Pro MCU board with an 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 are available on both EXT1 and EXT2 header on the kit for supporting Xplained Pro MCU kits with and without the EXT2 header. Driving the LEDs require both headers to be connected.

Table 1. QT3 Xplained Pro Extension Header EXT1
Pin on EXT1 Function Description
1 ID Communication line to the ID chip
2 GND Ground
3 Y LINE 1 For keypad: "1", "2", and "3"
4 Y LINE 2 For keypad: "4", "5", and "6"
5 Y LINE 3 For keypad: "7", "8", and "9"
6 Y LINE 4 For keypad: "C", "0", and "#"
7 X LINE 1 X-line 1 (For use with MCU kits without EXT2 header)
8 X LINE 2 X-line 2 (For use with MCU kits without EXT2 header)
9 X LINE 3 X-line 3 (For use with MCU kits without EXT2 header)
10 Not Connected  
11 Not Connected  
12 Not Connected  
13 Not Connected  
14 Not Connected  
15 LED COL1 LED driver for column 1
16 LED COL2 LED driver for column 2
17 LED COL3 LED driver for column 3
18 LED COL4 LED driver for column 4
19 GND Ground
20 VCC Target supply voltage
Table 2. QT3 Xplained Pro Extension Header EXT2
Pin on EXT1 Function Description
1 ID Communication line to the ID chip
2 GND Ground
3 X LINE 1 For keypad: "1", "4", "7", and "C"
4 X LINE 2 For keypad: "2", "5", "8", and "0"
5 X LINE 3 For keypad: "3", "6"," 9", and "#"
6 Not Connected  
7 LED ROW1  
8 LED ROW2  
9 LED ROW3  
10 LED ROW4  
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