System for detecting irregular operation of switch state...

Details System for detecting irregular operation of switch state... System for detecting irregular operation of switch state...

G - Physics

08

B

340/76

G08B 21/00 (2006.01) G08B 29/04 (2006.01)

Patent

CA 1332188

SYSTEM FOR DETECTING IRREGULAR OPERATION OF SWITCH STATE VERIFICATION CIRCUIT ABSTRACT A system for debouncing a switch circuit includes a sample circuit for providing an initial determination of the switch status, and a debounce circuit connected to operate on the output of the sample or sensing circuit to verify the actual switch status by providing a confirmation signal. The system of the invention accumulates a count related either to the rate at which the sample circuit operates, or the actual changes in state indicated by latches coupled to the sample circuit. If the count accumulates to a predetermined number before being cleared by a confirmation signal verifying the switch status, then the irregular operation is signalled. This identifies a continuous, rapid alternation between different switch states without a confirmation of an actual state change, which would otherwise be undetected by system operation.

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