13.29.2 Features

  • Low-Power, High-Sensitivity, Environmentally Robust Capacitive Touch Buttons, Sliders, Wheels and Proximity Sensing
    • Down to 8 μA with 200 ms scan rate
  • Supports Wake-up on Touch from standby Sleep mode
  • Supports Mutual Capacitance and Self Capacitance Sensing
    • 7/9 buttons in self-capacitance mode, for 32-/48- pins respectively
    • 12/18 buttons in mutual-capacitance mode, for 32-/48- pins respectively
    • 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 VDDANA 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
  • Driven shield for better noise immunity and moisture tolerance
  • 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
    • 5% CPU utilization scanning 10 channels at 50 ms scan rate
  • Using ADC peripheral for signal conversion and acquisition
  • Supported by the Start QTouch® Configurator development tools, which comprises QTouch Library project builder and QTouch analyzer. See also Atmel|Start and Atmel Studio documentation.(1)
    Note:
    1. Support is directly available only for SAML21, which can be used for SAMR30.