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