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AM2634-Q1: how to use external WDT?

Part Number: AM2634-Q1
Other Parts Discussed in Thread: AM2634, TPS653850A-Q1

Dear Champs,

My customer faced an issue when they are trying to use external WDT integrated in PMIC in the boot loader in their automotive application.

The problem is that it is hard to calculate WDT timer counts in boot loader as WDT timer started from POR reset. Moreover, it takes longer than WDT kick timing to load & execute it in boot-loader.

WDT kick timing is 70ms, but the booting time up to boot-loader is 300ms.

Could you please suggest how external WDT can be controlled in AM2634 boot loader?

Thanks and Best Regards,

SI.