4.4.6 QTouch Button

The SAM R34 Xplained Pro Evaluation Board contains a self-capacitance button, which can be used as an I/O. This QTouch button is intended to be driven by the built-in Peripheral Touch Controller (PTC) of the device. A zero ohm resistor is added on the board to easily disconnect the on-board touch buttons from the extension header since the I/O lines are shared between the QTouch button and extension header 1 (EXT1).