Keypad handling circuits

Details Keypad handling circuits Keypad handling circuits

1996-05-06

1998-07-21

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Plural switches

307112, 307141, 341 22, 341 24, 326 38, 379368, H01H 1904

Patent

active

057838747

ABSTRACT:
A key handling circuit for a switching matrix having row and column conductors includes bidirectional drives for the row conductors and the column conductors. The row drive and the column drive are in a low conductive condition except when a relevant key switch is activated. The row drive provides a current input for the column drive in one phase of operation and the column drive provides a current input for a row drive in a second phase of operation.

REFERENCES:
patent: 4357496 (1982-11-01), Nahas
patent: 4777375 (1988-10-01), Bozzuto
patent: 4959831 (1990-09-01), Wroblewski
patent: 4974482 (1990-12-01), Tamaki et al.
patent: 5128558 (1992-07-01), Ovens et al.

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