DS90UB954-Q1: VOD mismacth failed

Ben Kuo

Expert 7560 points

Part Number: DS90UB954-Q1

Dear expert,

Customer face to mismatch failed of MIPI_CSI HSTX.

According to our datasheet, the maximum value is 14mV when output 0/1.

Did we have register can fine tune this error? Thanks.

Regards,

Ben

over 5 years ago

0 Steven(Shenzhen) Shi over 5 years ago

TI__Mastermind 30515 points

Ben,

For UB954's CSI2 port, the DPHY spec. is verified to pass the 3rd party MIPI compliance test. For this mismatch spec. that you listed here, sorry we can't find tune it. But I would like to check the compliance test setup in your system when issue is reported.

best regards,

Steve

0 Ben Kuo over 5 years ago in reply to Steven(Shenzhen) Shi

TI__Expert 7560 points

Hi Junqiang,

Thanks for your support.

Customer still face to MIPI VOD mismatch issue now.

They have add 1pF at CSI_D0N and improve test result to close to margin.

As your last comment, we don't have register to fine-tune it. Is there any risk we add capacitor at CSI_D0N?

Attachment are last compliance test report I get from customer. please refer to this report.

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/CSI_5F00_D0N.mht

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/CSI_5F00_D0N-add-1pF.mht

I am asking for customer about the setup of compliance test with zoom in and point at device location.

Will share with you once I get.

Ben

0 Ben Kuo over 5 years ago in reply to Ben Kuo

TI__Expert 7560 points

Hi Junqiang,

Did we have MIPI test report on our EVM which can prove our device is meet MIPI spec?

If Yes, could you sent it to my mail box? Thanks.

benkuo@ti.com

Update test set-up.

- Measure point at Tx(954 side) with red circle.

- Oscilloscope :KEYSIGHT DSOS404A

Ben

0 Steven(Shenzhen) Shi over 5 years ago in reply to Ben Kuo

TI__Mastermind 30515 points

ok, i'll send it to you.

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DS90UB954-Q1: VOD mismacth failed