The watchdog circuit

Published:2011/7/5 8:21:00 Author:Borg | Keyword: watchdog circuit | From:SeekIC

See as the figure: when the circuit is working, just a CD4060 reset pulse is delivered timely, Q1 will be sure to be blocked, so the NMOS tube under control is conducting and provides power for the circuit. The virtue of the circuit is that the time is long, up to several minutes, which allows some systems to take a long time to reset. When the watchdog is fed with the pulse, a reset pulse is delivered to the auto counter by R2, C1 and R3, which makes sure Vout has output.



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