Key interface circuit with reduced number of input terminals

Details Key interface circuit with reduced number of input terminals Key interface circuit with reduced number of input terminals

1998-04-30

2000-06-13

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327403, 327407, H03K 522

Patent

active

060753900

ABSTRACT:
A static key interface circuit has an input terminal coupled to N key switches, where N is an integer greater than one. The N key switches are biased at different potentials, which are supplied to the input terminal when the key switches are closed. A multilevel detector in the key interface circuit detects the potential of the input terminal and generates corresponding result data. A dynamic key interface circuit has an input terminal coupled to P rows of N key switches each and scans the P rows in turn, using a similar multilevel detector. The multilevel detector increases the number of key switches connectable to a single input terminal by a factor of N.

REFERENCES:
patent: 4740966 (1988-04-01), Goad
patent: 5396245 (1995-03-01), Rempfer
patent: 5568070 (1996-10-01), Osaki et al.
patent: 5703505 (1997-12-01), Kwon

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