Microprocessor watchdog circuit

Details Microprocessor watchdog circuit Microprocessor watchdog circuit

G - Physics

06

F

G06F 1/24 (2006.01) G06F 11/00 (2006.01)

Patent

CA 2136384

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.

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