DRA821U-Q1: if TD2-4=20ms work for DRA821?

Brian Li

Genius 13850 points

Part Number: DRA821U-Q1

Hi team,

My customer is using our DRA821U-Q1.

And our requirement for TD2-4=10ms as below:

Customer wonder if 20ms can work & will there have any risk?

Thanks,

Brian

over 2 years ago

0 Robert Eschler over 2 years ago

TI__Guru 52125 points

If you are asking if any risk in extending the power-on reset assertion from 10ms to 20ms - no issue.

0 Brian Li over 2 years ago in reply to Robert Eschler

TI__Genius 13850 points

Hi Robert,

Will this 20ms have risk for power on and power off ?

Best Regards,

Brian

+1 Robert Eschler over 2 years ago in reply to Brian Li

TI__Guru 52125 points

The power on reset can be held indefinitely to the processor - so i don't see any risk. Do you have something (like a PMIC) managing the power to the processor, and if so - does it have a watchdog timer or similar? If so that needs to be studied, but no issue from the processor.

0 Brian Li over 2 years ago in reply to Robert Eschler

TI__Genius 13850 points

Hi Robert,

They are using our PMIC: PTPS65941515RWERQ1

Could you please help check ?

Thanks,

Brian

+1 Robert Eschler over 2 years ago in reply to Brian Li

TI__Guru 52125 points

The PMIC controls the reset timing, so how is customer impacting (wire-OR other logic inline)? Yes PTPS65941x PMICs do include watchdog functionality. It can be disabled via hardware strap (if needed). I think the default time is very large (minutes), so 20msec would not be an issue.

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DRA821U-Q1: if TD2-4=20ms work for DRA821?