Microprocessor watchdog circuit

Details Microprocessor watchdog circuit Microprocessor watchdog circuit

1993-11-30

1995-06-20

Beausoliel, Jr., Robert W.

Boots, shoes, and leggings

3642679, 364DIG1, G06F 1134

Patent

active

054267765

ABSTRACT:
A microprocessor watchdog circuit in which a voltage less than a reference voltage is supplied to a comparator substantially only in response to a pulse train status signal having a predetermined repetition rate. Repetition rate sensitivity results from a charge pump connected to receive the status pulse train through a series connected resistor and capacitor having a suitable time constant. The comparator output terminal, at which a reset signal is produced, provides a low impedance path to ground if the charge pump removes charge from a second capacitor more slowly than charge is supplied thereto through a charging resistor, thereby increasing the voltage supplied to the comparator.

REFERENCES:
patent: 4403302 (1983-09-01), Young et al.
patent: 4586179 (1986-04-01), Sirazi et al.
patent: 4759592 (1988-07-01), Dahnert
patent: 4888697 (1989-12-01), Hemminger et al.
patent: 5081625 (1992-01-01), Rhee et al.
L. Smith, "A Watchdog Circuit for .mu.C-Based System", Digital Design, pp. 78-79 (Nov. 1979).

Affiliated with

Also associated with

Rating

Microprocessor watchdog circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microprocessor watchdog circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microprocessor watchdog circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1851233