Finger sensor circuit diagram showing sensing traces (33), drive/shield electrodes (35) and switches (42, 43). When not being used for fingerprinting purposes, the drive/shield electrodes can also ...

On low-voltage subsystems like a fingerprint sensor, the designer is frequently asked to provide two power rails to supply the I/Os (3.3 V, for instance) and the core voltage (1.8 V or 1.5 V, for ...