Circuit and method for detecting the state of a switch with...

Details Circuit and method for detecting the state of a switch with... Circuit and method for detecting the state of a switch with...

2005-06-21

2005-06-21

Patel, Rajnikant B. (Department: 2838)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S530000, C340S479000, C307S116000

Reexamination Certificate

active

06909313

ABSTRACT:
A circuit and method are disclosed for detecting activation of a switch, such as a mechanical switch, having a first terminal coupled to two or more voltage sources, with each voltage source providing a distinct voltage level representing a logic high level. The circuit includes first circuitry, having an output coupled to the switch for initially placing a first voltage across the switch representative of a logic low level. The circuit further includes second circuitry having an input coupled to the switch for sensing a voltage differential appearing across the switch and an output for indicating whether the voltage appearing across the switch is at any voltage representative of the logic high level, the second circuitry being controlled to selectively eliminate static current drawn by the circuit based upon the value of the output of the second circuitry.

REFERENCES:
patent: 4051421 (1977-09-01), Brinner et al.
patent: 4658241 (1987-04-01), Torre
patent: 5025419 (1991-06-01), Nishino
patent: 5841644 (1998-11-01), Lipo et al.
U.S. Appl. No. 10/094,165, filed Mar. 8, 2002, Rong Yin, Tom Youssef, and David McClure.

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