A circuit, system, and method for converting self capacitance to a digital value may include a pair of charge transfer circuits, each including a deadband switch network, a sensor capacitor or modulation capacitor, and an integration capacitor may be coupled to a comparator to produce a bitstream representative of the capacitance of the sensor capacitor of one of the charge transfer circuits. The bitstream may be used to indicate a capacitance value of the self capacitance through conversion by a digitizing circuit element.

A key integrates with a biometric input device. According to an aspect of the present disclosure, a fingerprint scanner may be integral with a spacebar.

A key integrates with a biometric input device. According to an aspect of the present disclosure, a fingerprint scanner may be integral with a spacebar.

A key integrates with a biometric input device. According to an aspect of the present disclosure, a fingerprint scanner may be integral with a spacebar.