A watchdog circuit

Published:2011/9/19 1:14:00 Author:Ecco | Keyword: watchdog , circuit | From:SeekIC

The circuit is shown as above: when the circuit works, it needs to add the reset pulse to the CD4060 regularly, we can guarantee Q1 being in cutting off state, so that the tube controlled by the NMOS will be in conduction state to provide power to the processor circuitry. The circuit has the advantages of long timing time with over a few minutes; you can take a long time to initialize the system. The power passing R2, C1, R3 automatically provides a reset pulse to the counter to ensure that there is output of Vout. The circuit costs low. The biggest drawback of the circuit is feeding dog pulse requires wide band.



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