QMatrix method pin selection for UC3L

Refer AT32UC3L datasheet Table 28-2 Pin Selection Guide and Table 3-1 GPIO Controller Function multiplexing, for mapping between the QMatrix method pin name and the GPIO pin.  It is possible to configure a maximum of 17 X Lines and 8 Y-Yk pairs.  The X Line X8 (PA16) cannot be used for the QMatrix method as it is required to use this pin for the ACREFN function.

The CAT module provides an option to enable a nominal output resistance of 1 kΩ on specific CAT module pins during the burst phase.  The Table below captures the different QMatrix method pin wherein a Resistive Drive can be optionally enabled.  The rows marked with 'N' in the last column indicate that Resistive Drive option is not available on that pin.  By carefully choosing the QMatrix method X and Yk pins wherein Resistive Drive can be enabled, saving on external components is possible.

QMatrix method sensor provides detail on the number of Pin and Touch channels required for different QMatrix method sensor.  The hardware arrangement for Wheel or Slider must be such that all Touch channels corresponding to the Wheel or Slider belong to the same Yk Line.

Also, Library Configuration parameters for UC3L indicates the various Pin Configuration options for the QTouch Library that can be used to specify a user defined configuration.

The rows marked with 'N' in the last column indicate that Resistive Drive option is not available on that pin