Temperature threshold circuit with hysteresis
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United States of America Patent
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Dec 29, 2015
Grant Date -
Aug 27, 2015
app pub date -
Feb 27, 2014
filing date -
Feb 27, 2014
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Abstract
A circuit for determining a threshold indication of temperature with respect to a threshold temperature. The circuit includes a timer circuit and a temperature sensor circuit having an counter whose output has a relationship to temperature. At the end of a period determined by the timer circuit, a comparator circuit compares the count of the counter with an indication of the threshold temperature to determine a state of the threshold indication. In response to a change in state of the threshold indication, the circuit changes one of the count time or the counter output's relationship to temperature to provide a hysteresis for the threshold indication.
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