Watchdog circuit employing minimum and maximum interval detectors
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United States of America Patent
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May 6, 1997
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N/A
app pub date -
Feb 29, 1996
filing date -
Feb 29, 1996
priority date (Note) -
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Abstract
A watchdog circuit accepts an output signal from a monitored circuit such as a microprocessor to determine whether the monitored circuit is operating appropriately or has incurred an error. The monitored circuit must periodically assert the output signal to prevent the watchdog circuit, which imposes both upper and lower frequency bounds on the assertion of this signal, from 'timing out' and setting a watchdog error alarm. The watchdog circuit may be combined with other circuits, such as power on reset, battery back-up switching, etc., within a microprocessor supervisory circuit.
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