49.2 Features

The following are key features of the Peripheral Touch Controller module:

  • Low-power, high-sensitivity, environmentally robust capacitive touch buttons, sliders, and wheels
  • 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 charge measurement
  • Hardware noise filtering and noise signal desynchronization for high conducted immunity
  • Polarity control, allowing Parallel Acquisition (through the QTouch Library) individually controls the polarity of each line
  • Driven Shield+ 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