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LM8335: EVM Failure during operation, only connected to computer

Brian Butterfield
Intellectual 980 points
Part Number: LM8335

Hi TI Support Team,

LLM8335 EVM died during operation, looking  to see if you have seen similar failures during operation: 

           The LM8335EVM was only connected to my laptop and one slave device on the MIPI port (using 1.8V). It was just sitting operating while I was reading/writing data it just stopped working.

A similar thing happened about two years ago. I bought three boards, one stopped working after about one month. The other two have been working till now. The first one that died was replaced, but I never found out what was wrong with it.

Thanks,
Brian

  • 0
    TI__Guru 71910 points
    Hey Brian,

    The is the first I've heard of this happening. Is there any other details you can provide on what happened right before the device broke? (Accidentally pulled GND out from PSU and EVM?)

    Thanks,
    -Bobby
  • 0 in reply to BOBBY
    TI__Guru 62920 points

    Hi Brian,

    Do you have any updates on this you could share?

    Thanks,
    Max

  • 0 in reply to Miguel Robertson
    TI__Intellectual 980 points

    Hi Max,
    Yes,  "I changed the crystal to 20MHz and the board was completely unresponsive. Then, I also changed the capacitors from 20 to 10pF. Same thing, the board is non-responsive."

                  I’m not sure which processor you are referring to, the only circuitry/ ICs are those on the EVM board as provided by TI. That is the processor that needs to drive the SCLK at 20MHz.  Is there a need to select a different VIO pulse period?"

     Does this help at all?  OR what other information would help?


    My other thread on LM8335 with Bobby is 'locked', but appears the questions/activity are related.

    Thanks,
    Brian

  • 0 in reply to Brian Butterfield
    TI__Guru 71910 points

    Hey Brian,

    It sounds like this may be an issue with the processor. Can you provide me with the processor's datasheet, crystal datasheet, schematic around the crystal, and load cap.

    We will likely also need to verify if a 20MHz crystal can output a 20MHz switching frequency to our device. (I'm pretty sure this would require a software change to the processor).

    -Bobby

  • 0 in reply to BOBBY
    TI__Intellectual 980 points

    Hi TI Team,
    This issue is still open.  Can you help to think of any other reason for the possible EVM damage?
    Latest information/clues received:
    " The LM8335EVM was only connected to my laptop and one slave device on the MIPI port (using 1.8V). It was just sitting operating while I was reading/writing data it just stopped working.

    A similar thing happened about two years ago. I bought three boards, one stopped working after about one month. The other two have been working till now. The first one that died was replaced, but I never found out what was wrong with it."

  • 0 in reply to Brian Butterfield
    TI__Guru 71910 points

    Hey Brian,

    From the information provided, there is no clues as to what happened.

    It could have been some kind of transient event or ESD.

    Without further clues or a damaged device going through Failure Analysis, we won't know what happened.

    -Bobby