Datasheet

36.4 Signal Description
Table 36-1. Signal Description for PTC
Name Type Description
Y[m:0] Analog Y-line (Input/Output)
X[n:0] Digital X-line (Output)
Note: The number of X- and Y-lines are device dependent. Refer to Configuration Summary for details.
Refer to I/O Multiplexing and Considerations for details on the pin mapping for this peripheral. One signal
can be mapped on several pins.
Related Links
7. I/O Multiplexing and Considerations
2. Configuration Summary
36.5 System Dependencies
In order to use this Peripheral, configure the other components of the system as described in the
following sections.
36.5.1 I/O Lines
The I/O lines used for analog X-lines and Y-lines must be connected to external capacitive touch sensor
electrodes. External components are not required for normal operation. However, to improve the EMC
performance, a series resistor of 1 kΩ or more can be used on X-lines and Y-lines.
36.5.1.1 Mutual-Capacitance Sensor Arrangement
A mutual-capacitance sensor is formed between two I/O lines - an X electrode for transmitting and Y
electrode for sensing. The mutual capacitance between the X and Y electrode is measured by the
Peripheral Touch Controller.
SAM D21 Family
Peripheral Touch Controller (PTC)
© 2018 Microchip Technology Inc.
Datasheet Complete
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