32.2 Features

  • Low-power, high-sensitivity, environmentally robust capacitive touch buttons, sliders, wheels
  • Supports wake-up on touch from power-save 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 re-calibration of sensors
  • Single-shot charge measurement
  • Hardware noise filtering and noise signal de-synchronization for high conducted immunity
  • 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
  • Using ADC peripheral for signal conversion and acquisition
  • Supported by Atmel|START and Atmel Studio documentation.