Synaptics Incorporated
LOW-COST FORCE SENSOR

Abstract:

A sensor apparatus includes a capacitor and detection circuitry operable in at least a first mode and a second mode. When operating in the first mode, the detection circuitry is configured to measure a capacitance of the capacitor. When operating in the second mode, the detection circuitry is configured to monitor a piezoelectric response of the capacitor, where the piezoelectric response is determined based at least in part on the measured capacitance. In some aspects, the detection circuitry may detect a force exerted on the sensor apparatus based at least in part on the piezoelectric response of the capacitor. In some other aspects, the detection circuitry may process user inputs based at least in part on the piezoelectric response of the capacitor.