N-key rollover circuit

Details N-key rollover circuit N-key rollover circuit

1994-11-30

1995-09-05

Groody, James J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 26, H03M 1120

Patent

active

054482364

ABSTRACT:
An N-key rollover circuit including a matrix of crossing drive and output lines, switch elements connected between the drive and output lines, series resistors connected to the switch elements and current detectors connected to the output lines. A grounded current detection resistor is connected to an input terminal of each current detector, each current detection resistor having a resistance value which is smaller than the resistance value of the series resistors such that most of the drive transmitted through a selected switch element onto an output line passes through the current detection resistor, even if more than one switch element is selected.

REFERENCES:
patent: 4633228 (1986-12-01), Larson
patent: 4709228 (1987-11-01), Hucking et al.
patent: 4772874 (1988-09-01), Hasegawa
patent: 4994634 (1991-02-01), Tanji et al.
patent: 5057836 (1991-10-01), Inaba
patent: 5081453 (1992-01-01), Endoh et al.
patent: 5189417 (1993-02-01), Caldwell et al.

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