4.2.1 QTouch Button

The SAM4L8 Xplained Pro kit has one QTouch button and the connection to the SAM4L8 is shown in the table below. The QTouch sensor, a copper fill, is located on the second layer (GND) of the board. The sensor is shielded by the third and the bottome layer (VCC and signal layer respectively) and therefore the sensor is not affected by any touches from the back side of the board.