Watchdog circuit employing minimum and maximum interval detector

Details Watchdog circuit employing minimum and maximum interval detector Watchdog circuit employing minimum and maximum interval detector

1996-02-29

1997-05-06

Wambach, Margaret Rose

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Determining machine or apparatus operating time or...

G07C 302

Patent

active

056278675

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.

REFERENCES:
patent: 5228066 (1993-07-01), De Vane
Steven R. Savitzky, "Basic Concepts and Components", Real-Time Microprocessor Systems, Van Nostrand Reinhold Company, New York, 1989, p. 80.
Paul Horowitz, Winfield Hill, "Microprocessors", The Art of Electronics, Second Edition, Cambridge University Press, New York, 1989, p. 764.

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