28.2 Features
- Low-power, high-sensitivity, environmentally robust capacitive touch buttons, sliders, wheels and proximity sensing
- 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.
- 256 buttons in mutual-capacitance mode
Refer Features Section of this device for information on the number of buttons supported.
- 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 and free-running charge measurement
- Hardware noise filtering and noise signal de-synchronization for high conducted immunity
- 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 50ms scan rate