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TPS3430-Q1: Basic question about WD Timer

Bengi Long
Intellectual 2220 points
Part Number: TPS3430-Q1

Hi team,

I've got several basic questions about WatchDog Timer, including:

1. When to use Internal WD, and when to use external WD? Why?

2. The key spec of WD Timer that customer pays attention to

Thanks a lot for your help!

Best Regards,

Bengi Long

  • +1
    TI__Mastermind 18870 points

    Hi Bengi,

    Typically, you would use an external watchdog if safety is a concern to your application. In current embedded processors the internal watchdog device is in the same die as the rest of the IC, which means that if an internal failure happen to the embedded processor, the watchdog will fail as well. While an external watchdog can flag such failure. 

    Depending on the application the customer will be looking for specs below:

    • Type of watchdog: Timeout, Window, and "Question and Answer" watchdog
    • Available watchdog timing
    • Timing accuracy and Iq of the device 
    • Additional functionality needed: Manual reset (MR), watchdog enable (WD_EN), Voltage monitoring, Latch output, and etc

    Jesse