4.2.4 QTouch Button

There is one self capacitance button available on the SAM L21 Xplained Pro board that can be used as 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 onboard touch buttons from the extension header, as the I/O lines are shared between the two.

Note: To get started with QTouch refer to Atmel QTouch® Library and Atmel QTouch® Composer.
Table 4-11. QTouch Connection
SAM L21 pinSilkscreen textShared functionality
PA10QT BTN1EXT2