Input detection circuit for a matrix keyboard

Details Input detection circuit for a matrix keyboard Input detection circuit for a matrix keyboard

1998-01-23

2000-08-15

Horabik, Michael

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 33, 341 20, 370368, G08B 706

Patent

active

061043206

ABSTRACT:
An input detection circuit includes a matrix of keys formed by the intersection of a plurality of columns of keys and a plurality of rows of keys, with a crossover capacitor connected across the intersecting row and column of one of the keys. The input detection circuit further includes circuits for generating a difference in voltage potential across the capacitor, and circuits responsive to the difference in voltage potential across the capacitor for generating a signal representative of the presence of the capacitor. By knowing which keys have been connected with a crossover capacitor, the processor of the telephone will also know what scan options have been programmed.

REFERENCES:
patent: 3696908 (1972-10-01), Gluch
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patent: 4772874 (1988-09-01), Hasegawa
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patent: 5349344 (1994-09-01), Head
patent: 5450080 (1995-09-01), Irwin
patent: 5508700 (1996-04-01), Taylor
patent: 5956795 (1999-01-01), Arnold

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