Circuit and method for detecting the state of a switch

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

2005-06-07

2005-06-07

Patel, Rajnikant B. (Department: 2838)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S530000, C340S479000, C307S116000

Reexamination Certificate

active

06903584

ABSTRACT:
A circuit and method are disclosed for detecting activation of a switch, such as a mechanical switch. The circuit may include a first circuit for temporarily driving the second terminal of the switch to a second logic level. A second circuit, coupled to the switch, senses a voltage level of the second terminal of the switch and generates an output signal representative of the voltage sensed. A sequential logic circuit is responsive to the output signal of the second circuit so as to maintain a logic value representative of the switch having been closed.

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. 10/147,639, filed May 17, 2002, Youssef.

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