Watchdog circuit for carbon monoxide monitors

Details Watchdog circuit for carbon monoxide monitors Watchdog circuit for carbon monoxide monitors

1995-04-21

1998-10-27

Beausoliel, Jr., Robert W.

39518501, G01R 3128

Patent

active

058288228

ABSTRACT:
A microcontroller supervision circuit comprising an electronic control capable of causing a high-impedance on at least one external pin upon occurrence of a reset condition. A supervision circuit is coupled to the at least one external pin for detecting the high-impedance condition. Upon detection of the high-impedance condition, a signal is generated to indicate failure of the microcontroller to execute code. The microcontroller is programmed to remove the high-impedance condition when code is properly executed within the microcontroller.

REFERENCES:
patent: 4251883 (1981-02-01), Grants et al.
patent: 4514845 (1985-04-01), Starr
patent: 4965800 (1990-10-01), Farnbach
Microchip Data Book, Chapter 2 PIC16C5X Series, Sections 1-5, Microchip Technologies, Inc. (1993).

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