AN-1141 A Two-Button Touch Sensor

This simple, compact, and low cost touch sensor can be used in many devices to detect fingers touching a surface or two-button area. It operates because the additional capacitance added to the circuit by the fingers changes the frequency of a generator. While capacitance increases, frequency decreases. This change is detected by the GreenPAK. One SLG46620V is enough to implement two button touch sensors.

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