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DS90UB935-Q1: The ESD test failed

Tommy
Intellectual 515 points
Part Number: DS90UB935-Q1

Hi E2E,

The connection to DS90UB935TRHBRQ1 is DS90UB954TRGZRQ1.

In the ESD air discharge and contact discharge, there will be video delay when the voltage is above 4kV.

At this time, the IPS input signal to DS90UB935TRHBRQ1 is continuous and without abnormality.

The details are confirmed as follows:

1, a single ESD air discharge test to the product as shown in the attached video(DS90UB935TRHBRQ1-ESD) about 5s test stuck.

2. When the continuous test is applied, the MCU determines that the output signal of DS90UB935TRHBRQ1 is abnormal and takes the initiative to restart the whole camera.

Through the above phenomena, it is seems that the abnormal output of DS90UB935TRHBRQ1 in ESD test leads to the screen delay.

(NOTE:The SCH & PCB layout are non-public and can only be shared with TI)

  • 0
    TI__Genius 16230 points

    HI Tommy,

    Thank your for your inquiry. What is your question on this ESD?

    Glenn

  • 0 in reply to Glenn Uranga
    Intellectual 515 points

    Hi Glenn,

    In the ESD test process, the output screen appeared stuck phenomenon.

    As the video shows.

  • 0 in reply to Tommy
    TI__Genius 16230 points

    Hi Tommy,

    Can't seem to load the file. Can you zip it and upload?

    Glenn 

  • 0 in reply to Glenn Uranga
    Intellectual 515 points

    DS90UB935TRHBRQ1-ESD.zip

    I changed the file to zip format and updated it.

    PLS check it.

    Thanks

  • 0 in reply to Tommy
    TI__Genius 16230 points

    Hi Tommy,

    I think you are getting link errors causing the relock on the device. We can try some registers to see if this improves.

    board.WriteI2C(0x60, 0x4C, 0x01)
    board.WriteI2C(0x60, 0xD4, 0xB1)
    //Fix the AEQ, avoiding the Equalizer adaption during the PLL locking, which maybe miss more data and impact the display.
    board.WriteI2C(0x60, 0xB9, 0x3F)
    //Increase Link Error counter threshold, which make the PLL lock condition more robust.
    Glenn 
  • 0 in reply to Glenn Uranga
    TI__Genius 16230 points

    Hi Tommy,

    Do you have any further questions? 

    Glenn