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DS90UB934-Q1EVM: 1 derserializer kit working, 2 kits couldn't be recognized

Part Number: DS90UB934-Q1EVM
Other Parts Discussed in Thread: ALP, USB2ANY

Greetings,
We have 3 kits, when we tried to power up the third one exactly like the image provided by @Vishy ( to power it up from J24), it worked and the PC recognized the derserializer in ALP software.

However the other 2 kits still couldn't be recognized, we tried to re-flash the firmware of the microcontroller using USB2ANY Firmware Loader.exe, we flashed USB2ANY_2_7_0_0.txt but with no luck.
we now suspect that the old way we were powering the kits with, it might have caused over voltage or something. (see the attached photos),  we were powering the kit by applying 12V on J26 & 9V on J32.

When we power up anyone of the 2 (non-working) kits through J24, 5 leds on the board go on (exactly like the working one). see the second image.

Could we know what may be causing this problem in these 2 kits, do you have any test points we could investigate in those cases ? ( we also had a quick check on the deserializer rails yesterday, but all voltage seem okay)

first Image ( the old way of powering up the kit )

the old way of powering up the kit

second image (the non-working kit when powering it up with the normal way)

the non-working kit

  • Hello,

    So to power the EVM all you need to do is power the 12V input like you have in the second image.  To clarify, you have three DS90UB934 EVM kits and two of them are not recognizable by ALP, correct?  Also can you clarify what you mean by "couldn't be recognized"?  Are you saying that ALP doesn't show anything in the devices list?  Also, since you said you were able to flash the firmware on the MSP430 but still not able to communicate with the dserializer are you able to probe the I2C lines on the EVM and see if communication is occurring and if you are receiving an ACK from the 934?

    Regards,

    Nick

  • Hello @Nicholas
    yes we have three DS90UB934 EVM kits and two of them are not recognizable by ALP, however only one is recognizable.
    By saying not recognizable, I mean it gives us unknown des in ALP and also when connecting the Camera LVDS, the lock led doesn't light up.

    There is also a notice regarding the I2C pins on the kits, the I2C_clk always gives 0V.
    Of course we tried to send to the des by Aardvark, but with no luck. 
    We just suspect the power rails to be defective 


     

  • Hello,

    So I don't feel that the kits are defective.  If you had one that wasn't working maybe, but I doubt two defective kits. The UNKNOWN DESERIALIZER means that ALP cannot communicate with the device, and having an I2C clock line that is constantly pulled low means the MSP430 cannot communicate with the 934.  Are you able to verify that your jumpers and configuration settings match the working 934? 

    Also can you verify that the pull-up resistors are intact on the non working 934s?

    Unless the I2C devices were somehow burned out by this possible overvoltage you mentioned, I would think that you should be able to see something on the I2C lines.

    Regards,

    Nick 

  • Hello Nick,
    yes the  jumpers and configuration settings match exactly the working 934.
    I checked the pull-up before, what I did find is that before the resistors the VDD was correct but after the resistor, the bus was grounded. but what may be causing the 0V the MSP or the derserializer ?
    Is there a test point in the kit from which we can check the derserializer is alive ?
     

  • Hello,

    You could start by measuring continuity of the I2C lines to ground and see if they are shorting some how.  Is it both the I2C lines or just one that is pegged at zero?  If you have a serializer board as well, you may be able to connect to the non-working deserializers and see if they lock.  That way you can tell if the 934 is still working and wasn't damaged.

    Regards,

    Nick