Why would a customer require a windowed watchdog part over a normal watchdog?

Document created by analog-archivist Employee on Feb 23, 2016
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Why would a customer require a windowed watchdog part over a normal watchdog?

 

The windowed watchdog part gives a higher level of fault coverage so is
normally preferred in high reliability or critical systems. The watchdog pulse
has to occur within a defined time window to avoid a reset. An example of a
fault that this captures is where the processor is stuck in a loop and
providing WDI pulses continuously at the clock frequency. This would be
detected as a fast watchdog fault by a windowed watchdog but would not be
detected as a fault by a normal watchdog.

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