Electrical matrix keyboard scanning circuit

Details Electrical matrix keyboard scanning circuit Electrical matrix keyboard scanning circuit

1994-03-11

1995-10-31

Peng, John K.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 22, 341 24, H03K 1794, H03M 1100

Patent

active

054633869

ABSTRACT:
Disclosed is a scanning circuit for an electrical matrix keyboard. The keyboard has extended keys on a voltage line and a ground line. Two extended line detector are incorporated into the circuit for detecting the extended keys without increasing input and output ports of the circuit, so that the circuit can be integrated into a chip at a lower cost.

REFERENCES:
patent: 4266278 (1981-05-01), Ebihara et al.
patent: 5036320 (1991-07-01), Wroblewski
patent: 5285495 (1994-02-01), Wu et al.

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