TPS3850: Operation after trigger of watchdog

anovickis

Part Number: TPS3850

On this device -

If it's set to watchdog mode, and the conditions for triggering the watchdog fail are met

I see WDO* will be low

Does it stay in that mode with a new WDO* pulse for _every_ fail of the WDI not meeting the window , or does it work only once per power cycle ?

IE do I need to reset this to re-arm and how ?

0 Abhinav.Sharma over 4 years ago

Hi Anovickis,

The /WDO will stay low as long as WDI does not satisfy the watchdog timeout condition.

Thanks,
Abhinav.

0 anovickis over 4 years ago in reply to Abhinav.Sharma

Here's what the (TI) spice model does for WDO( purple) with one satisfactory input on WDI, and multiple unsatisfactory WDI (green) input conditions

(also ignore magenta trace)

I assume the WDI window timer resets after receiving an WDI event not within window?

0 Abhinav.Sharma over 4 years ago in reply to anovickis

Hi anovickis,

I cannot see the image. The WDI window timer does reset after every fault.

Thanks,

Abhinav.

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