Download User Manual PCM-C3500 Series Evaluation Kit (PCM

3.3.3.3 WatchDog Timer
It is important in industrial applications that control systems rarely crash, or are capable of self-resetting if they hang or stop functioning. The Watchdog function for automatic system resetting is therefore provided in PCM-C3530/3503. There is a timer
inside the watchdog function. User’s AP could invoke the associated APIs in the
Watchdog function to start the timer, and then the Watchdog function would repeat
the countdown of the specified period of time to reboot the system if the user’s AP
does not clear the timer in time periodically. The Watchdog function in the PCMC3530/3503 provides eight different time intervals: 1 msecond, 10 mseconds, 30
mseconds, 100 mseconds, 1 second, 10 seconds, 60 seconds and Disable. The
“Enable” button is used to start the Watchdog function. Pressing the "Sleep" button
will cause the system into suspend mode. Pressing the “ReBoot” button will cause
the system to cold boot.
Note!
Based on the Watchdog IC- MAX6369 characteristics, it will have 1~3
times the delay time. For example, if you set “10 seconds” Time Period,
the system will reset between 10 ~ 30 sec.
Figure 3.9 Watchdog Timer
PCM-C3500 Series Evaluation Kit User Manual
50