DS90UB940N-Q1: Abnormal MIPI CLK TCLK-PREPARE

Dongbao Zhou

hello,

Could you let me know the possible reasons for the abnormal MIPI CLK TCLK-PREPARE? Customer find low probability of black screen (1/10000) for power on-off test.

Abnormal case TCLK-PREPARE>2ms, normal case TCLK-PREPARE <95ns.

Left: abnormal MIPI CLK, right: normal MIPI CLK

Dongbao

over 2 years ago

0 Ben Dattilo over 2 years ago

TI__Mastermind 25765 points

Hi Dongbao,

I cannot see any of the measurements on these images, can you post the individual images?

Is this end-to-end video, or patgen?

Is this one unit that shows the issue 1/10000 power cycles, or 1/10000 units? Can you try to recover by power cycle or digital reset?

Regards,

Ben

0 Dongbao Zhou over 2 years ago in reply to Ben Dattilo

TI__Expert 4180 points

Hi Ben,

Sorry, i don't have a high resolution waveforms on my hand, i cand confirm the only difference is the LP00 duration, abnormal one with ~2ms, normal one is <95ns.

It's power cycle test, total sample # is 5pcs. This issue could be solved by power reset or digital reset.

0 Ben Dattilo over 2 years ago in reply to Dongbao Zhou

TI__Mastermind 25765 points

Hi Dongbao,

Does this issue occur during end-to-end video or patgen? Can you have the customer see if it happens during patgen?

Please make sure the power up sequence matches what is in the datasheet.

Regards,

Ben

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DS90UB940N-Q1: Abnormal MIPI CLK TCLK-PREPARE