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Simple latching watchdog timer

Posted: 13 Apr 2011 ?? ?Print Version ?Bookmark and Share

Keywords:fan? tachometer?

Based on a ?P-supervisor/watchdog IC (MAX6749), the circuit discussed in this application note provides a latched failure indication in response to a loss of the input pulse stream. The circuit can monitor a fan (based on the fan's tachometer output), an oscillator, or the software execution of a microprocessor.

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