DS90UB933-Q1: unexpected spike in VDD

Dongbao Zhou

Part Number: DS90UB933-Q1

Hi team,

My customer found an unexpected spike of the input power which appears 1ms before VDDIO and VDD power up, the peak voltage of the spike is around 1.2V and duration is about 100us, from the system test, we don't see it affect 933 operation.

Do you see any potential risk? PS: spike only appear before power up, after power up, VDDIO and VDD voltage within d.s recommend range.

Regards,

Dongbao

over 3 years ago

0 Sally Cheung95 over 3 years ago

TI__Expert 5480 points

Hi Dongbao,

Other than the spike, does the rest of the system power up comply with the power sequencing in the 933 datasheet?

Thanks

Sally

0 Dongbao Zhou over 3 years ago in reply to Sally Cheung95

TI__Expert 3930 points

Yes, the rest are fully complaint with 933 datasheet requirement.

0 Dongbao Zhou over 3 years ago in reply to Dongbao Zhou

TI__Expert 3930 points

Is there any internal VDD UVLO reset circuit of 933? What's the trigger threshold of UVLO? And how long does it take to reset?

0 Sally Cheung95 over 3 years ago in reply to Dongbao Zhou

TI__Expert 5480 points

Closing because this moved to email thread.

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DS90UB933-Q1: unexpected spike in VDD