48.3 Block Diagram

Figure 48-1. PTC Block Diagram Mutual Capacitance
Note: For PIC32CM LE00/LS00/LS60 the RS = 100 KΩ.

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.

Figure 48-2. Mutual Capacitance Sensor Arrangement
Figure 48-3. PTC Block Diagram Self Capacitance
Note: For PIC32CM LE00/LS00/LS60 the RS = 100 KΩ.

A self-capacitance sensor is connected to a single pin on the Peripheral Touch Controller through the Y electrode for sensing the signal. The sense electrode capacitance is measured by the Peripheral Touch Controller.

Figure 48-4. Self-Capacitance Sensor Arrangement

For more information about designing the touch sensor, refer to Buttons, Sliders and Wheels Touch Sensor Design Guide.