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SN65HVD1050-EP: SN65HVD1050 Application issue

Jimmy WANG
Genius 3435 points
Part Number: SN65HVD1050-EP
Other Parts Discussed in Thread: SN65HVD1050, , TCAN1057A-Q1

Hi team,

My customer uses SN65HVD1050 to replace  NCV7351D10R2G. But now testing is well on lab.

Deliver to customer to do test. the device will damage on pin5 in a long time test. IC restance only 20R of pin5 after damage.

Do you have any ideas to improve this issue?  maybe ESD cause?

  • 0
    TI__Guru 71912 points

    Jimmy,

    Thanks for bringing this to E2E. Can you elaborate on the kind of testing the customer is performing? And how is pin 5 on the SN65HVD1050-EP connected in their schematic? It looks like the NCV7351D10R2G pin 5 is a no connect, so if they aren't using it with that device, it shouldn't be used on the SN65HVD1050-EP as well.

    One more note, the SN65HVD1050-EP is a much older device, and is meant for extended temperature range applications. The NCV7351 doesn't have this extended temperature range, and TI has an updated device with the same functionality, the TCAN1057A-Q1. If possible, we should move the customer to this device, unless they need the extended temperature range.

    Regards,

    Eric Hackett

  • 0 in reply to Eric Hackett
    Genius 3435 points

    Hi Eric,

    The customer needed 1/2 VCC of Pin5 function. Seems like there aren't many products with features like this. 

    Do you have any suggestions for this issue? 

     

  • 0 in reply to Jimmy WANG
    Guru 285410 points

    Only older SN65HVDxxx transceivers have this feature.

    Newer THVDxxx devices do not need it: [FAQ] CAN transceiver SPLIT pin.

    If the customer really wants it, it could be generated with a voltage divider; below is from the SN65HVD1050 datasheet:

    The only plausible cause of damage is over/undervoltage at this pin. Vref is as well protected as the other bus pins, so I see no reason why only this pin would get damaged.

  • 0 in reply to Clemens Ladisch
    TI__Guru 71912 points

    Jimmy,

    Clemens is correct here, except newer TCAN devices, not THVD, do not need it. The main reason for this reference voltage is to help with EMC by driving a stronger common-mode signal. With newer TCAN devices, EMC testing passes without the need for this stronger common-mode.

    To add to what Clemens said, why does the customer need this feature? And yes, the most plausible cause for damage is overvoltage. From their schematic you've shared, I can't tell where pin 5 is actually connected. Can you clarify this?

    Regards,

    Eric Hackett