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Watchdog Timer

Safety Features Application

Watchdog timers are used for automatically generating a system reset signal if the microcontroller or microprocessor neglects to periodically send a pulse. Monitoring for low supply voltage is an additional, common feature of watchdog ICs.

Ingredients

Any GreenPAK w/ ACMP’s
No other components are needed

GreenPAK Diagram

Design Steps

Set undervoltage threshold with an ACMP.
Configure two CNT/DLY blocks asFrequency detects.
Design the digital logic to combine active signals from undervoltage and watchdog timeout.
Add a One-shot counter to trigger the reset pulse. It can be inverted to be active low.

资源

GreenPAK Designer files

Watchdog Timer GP(5.33 KB)

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