40.2 Features

The following are key feature of the PTC module:

  • Low-Power, High-Sensitivity, Environmentally Robust Capacitive Touch Buttons, Sliders, Wheels and proximity sensing
  • Supports Wake-up on Touch from Standby Sleep mode
  • Supports Mutual Capacitance and Self Capacitance Sensing
    • Mix-and-Match Mutual and Self Capacitance Sensors
  • One Pin per Electrode – No External Components
  • Load Compensating Charge Sensing
    • Parasitic capacitance compensation and adjustable gain for superior sensitivity
  • Zero Drift Over the Temperature and VDD Range
    • Auto calibration and recalibration of sensors
  • Single-shot and free-running Charge Measurement
  • Hardware Noise Filtering and Noise Signal Desynchronization for High Conducted Immunity
  • 3-Level Driven Shield Plus for better noise immunity and moisture tolerance
    • Any PTC X/Y line can be used for the driven shield
    • All enabled sensors will be driven at the same potential as the sensor scanned
  • Selectable channel change delay allows choosing the settling time on a new channel, as required
  • Acquisition-start triggered by command or through auto-triggering feature
  • Low CPU utilization through interrupt on acquisition-complete
Note: A complete overview of supported features, along with how to access the touch library using the MPLAB Code Configurator can be found at www.microchip.com/mcctouch.