Program controlled capacitive keyboard sensing system

Details Program controlled capacitive keyboard sensing system Program controlled capacitive keyboard sensing system

G - Physics

06

F

354/236.51

G06F 3/023 (2006.01) H03K 17/96 (2006.01) H03K 17/98 (2006.01) H03M 11/20 (2006.01)

Patent

CA 1147868

PROGRAM CONTROLLED CAPACITIVE KEYBOARD SENSING SYSTEM Abstract An improved sensing apparatus for detecting impedance changes in a variable impedance matrix keyboard is described. A microprocessor is utilized to control the basic key in- tersections scanning and for accurately calibrating and adjusting the sensing threshold of the sense amplifier prior to testing each key intersection so that the effects of stray impedance and varying voltage levels may be compensated for.

352829

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