A direct-contact finger mouse realized in 0.7-um digital CMOS is presented. It is based on the motion detection of the fingerprint images acquired with a capacitive sensor. Stroking and tapping the chip surface with the finger causes movement of the cursor and clicking-like mouse. By properly partitioning analog collective computation and digital processing, a power consumption of about 900 uW at 5 V is achieved. The sensor area is 3.8 × 3.8 mm2, and overall chip size is 7.7 × 6.7 mm2
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