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TPS3850: Enabling WDG after a Disable with different SET0 and SET1 Configurations

Ahmed Eltahan
Prodigy 30 points

Hello,

I need to know that if I have a running WDG with a SET0 and SET1 configurations, for example 1 and 1 so ratio is 1/2, and then I disabled it with 1 and 0. When it is disabled, I changed SET0 to 0 so ratio is 1/8. So, it's enabled but with what ratio 1/8 or 1/2. Noting that, the datasheet explains that no change will occur if it's running and changed SET0 and SET1 to other ratio till a reset takes place. 

Thank you.

  • 0
    TI__Genius 12630 points

    Ahmed Eltahan,

    When you disable the watchdog, then re-enable, your watchdog window is set for the window before disabling until a reset occurs (that is V_SENSE drops below VIT-). When a reset occurs, the watchdog window will set for the window configuration window at that moment.

    In your example, you have SET0 = SET1 = 1. This sets a window between 800ms and 1.6s. When you SET1 = 0 to disable, then you SET0 = 0 for the new window 22.5ms to 55ms, the watchdog window remains 800ms to 1.6s. When V_SENSE drops below VIT-, then the window changes to 22.5ms to 55ms.

    I hope this answers your question. Let me know if you have any more questions. Thanks!

    -Michael