Digital wake-up signal from switch transition of two analog signals
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United States of America Patent
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Apr 17, 2007
Grant Date -
Jul 7, 2005
app pub date -
Dec 30, 2003
filing date -
Dec 30, 2003
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Abstract
A digital wake-up signal is generated from an analog switch on a printed circuit board in which a ground trace and multiple conductive switch traces are bridged by a moveable contactor responsive to movement of an actuator. A resistor network is coupled to the switch traces and alternatingly connects the switch traces to two outputs to generate distinct analog voltage outputs. A logic gate determines when both outputs are at the same voltage corresponding to the contactor engaged between two adjacent switch traces and generates a wake-up command signal.
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