3.3.1.2 DEF_SENSOR_TYPE
Defines the type acquisition measurement type. This also depends on the sensor design and/or layout.
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Self-Capacitance Sensor Requires one Y-line sense pin per button.
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Mutual Capacitance Sensor Requires one X-line drive pin and one Y-line sense pin per button. Can realize N x M number of sensors in a matrix form using N X-line and M Y-line.
- Self-Capacitance with Driven Shield Shielding the sensor may be required in cases where there are noisy circuits near to touch sensors. Adding a ground shield can have an impact on touch performance (sensitivity and water tolerance). The driven shield acts as an alternative to the ground shield without compromising the sensitivity and water tolerance. A driven shield can be enabled either on adjacent sensors only or additionally using a dedicated shield sensor. Having a dedicated shield sensor improves both noise performance and water tolerance. Configuring the adjacent sensor as a Driven shield improves water tolerance on touch surfaces.
| Parameter | Value |
|---|---|
| DEF_SENSOR_TYPE | For Self-capacitance - NODE_SELFCAP For mutual capacitance - NODE_MUTUAL For Self-capacitance with Driven Shield - NODE_SELFCAP_SHIELD |