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SN65HVD1050 Failure

Shinu.V.Mathew
Expert 7445 points
Other Parts Discussed in Thread: SN65HVD1050

Hi Team,

One of our customer is using SN65HVD1050 in their fule dispensing product and facing field failure in one card. SN65HVD1050 is used for internal communication from one slave card to the master control card. Almost 50 units were return from field, tested P2P impedance and found no difference with working units. Attached is the schematic for your reference, can you please recheck the same and help with few suggestions.

Thanks in advance for help and support.

E2E.pdf

With Regards,

Shinu Mathew.

  • 0
    TI__Guru 62910 points
    Hi Shinu,

    Since all the pin impedances were normal, what kind of issues are the failing devices showing? Can you please check them for proper operation by observing the signals at each pin to make sure the device is properly powered, that signals on the TXD input are output properly on CANH/CANL, and that signals received on CANH/CANL are reflected properly on the RXD output?

    Max
  • 0 in reply to Max Robertson
    TI__Expert 7445 points
    Hi Rob,

    Thanks for your reply.
    Few more devices failed. Customer tried to probe devices to understand the output wave forms but due to glue sealing (pcb sealed inside box with epoxy glue) they were not able to do this testing, some how they removed the glue but it damages the pin also. Replaced the part with new IC's and the board starts working.
    Customer want to confirm that these failures are not due any discrepancy in schematic which create failures in log run.

    Regards,

    Shinu Mathew.
  • 0 in reply to Shinu.V.Mathew
    TI__Guru 62910 points
    Shinu,

    I don't see any issues with the schematic or anything that would explain damage to the units. You may want to submit the units for failure analysis so that we can assess the damage to the ICs. Sometimes this can be useful in suggesting a root cause (by identifying which pins have been overstressed, etc.).

    Regards,
    Max