The STWD100 is a watchdog timer, if a pulse from a microprocessor isn't received in X amount of time, it pulls it's output low. This is useful to detect if a processor has experienced an upset (independent of the processor itself). This is the timing diagram of what I want the STWD100 to do:
I want it to pull the output low if WDI changes and I would like it to stay low There is no way I have found to do this with the STWD100PY chip. Apparently normal triggering is not really an option and timeout without retrigger is the only option.
I've checked a few other circuits and cannot find a good simple way to implement this functionality. Anybody know a good way to have a timer watchdog circuit in a small footprint that goes low and stays low?