40.3 Block Diagram

Figure 40-1. PTC Block Diagram Mutual Capacitance
Note: For PIC32CM JH00/JH01 the RS = 0, 20, 50, 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 40-2. Mutual Capacitance Sensor Arrangement
Figure 40-3. PTC Block Diagram Self Capacitance
Note: For PIC32CM JH00/JH01 the RS = 0, 20, 50, 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 40-4. Self-Capacitance Sensor Arrangement

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