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TCAN1042HG-Q1: Schematic review

Lin_Charles
Expert 4260 points
Part Number: TCAN1042HG-Q1
Other Parts Discussed in Thread: TPS92662-Q1

Hi team. My customer use 1042 between MCU and TPS92662-Q1. Supply is from UJA1169. Customer finds that the device will break sometime, and TJA1044 always works properly in below circuit. Please help review if there is anything that can cause our device to fail. Thanks.

  • 0
    TI__Guru 70992 points
    Charles,

    Can you give some detail on how the device breaks? That is, what is indicating a failure/breaking in performance?

    Regards,
  • 0 in reply to Eric Hackett
    TI__Expert 4260 points
    With the same source code of MCU, our device cannot get any feedback data from TPS92662-Q1. While TJA1044 can. I may need your help to review this schematic and give me some suggestion to do debug. Thanks.
  • 0 in reply to Lin_Charles
    TI__Guru 70992 points

    Charles,

    This could be due to very slight timing differences between the TJA1044 and TCAN1042, but I think it's more likely that it is a CAN signal issue. I have a few questions:

    • There doesn't look to be anything wrong with the schematic, nothing that would cause signal integrity issues.
    • Can you send over any oscilloscope screenshots of the CAN bus signals, RXD, and/or TXD of the feedback data that isn't being received correctly?
    • It looks like the TPS92662-Q1 outputs to TXD and RXD of the CAN transceiver, then the messages go along the CAN bus to another transceiver and then to the MCU. Is my understanding of the system correct? If so, are the same transceivers being used at both spots?

    Regards,

  • 0 in reply to Eric Hackett
    TI__Guru 70992 points
    Charles,

    Is there any update on this?

    Regards,
  • 0 in reply to Eric Hackett
    TI__Expert 4260 points
    Thank you for your help here. I do not have oscilloscope screenshots of the CAN bus signals. There are two CAN transceiver between MCU and TPS92662, TCAN1042 (TJA1044 )in the MCU side and UJA1163 in the 662 side. Will It matter in this issue? Thanks.
  • 0 in reply to Lin_Charles
    TI__Guru 70992 points
    Charles,

    Getting oscilloscope screenshots of the CAN bus while this device isn't working will be very helpful in debugging this problem, so if there's any possible way for you to get hem, that would be great.

    The UJA1163 and TCAN1042 (TJA1044) being between the two controllers should not cause any problems. There are only minor timing differences between the TJA1044 and TCAN1042, so I'm not sure why one would work on the other.

    Is there any possible way to get any kind of probe information on the TCAN1042 and TJA1044 while in use? What is the data rate being used in the application? Does the TCAN1042 ever work, and how long before it stops working?

    Regards,
  • 0 in reply to Eric Hackett
    TI__Guru 62920 points
    Hi Charles,

    Have you had a chance to look into this further, following Eric's suggestions above? I think this is important for us to debug the issue.

    Thank you,
    Max
  • 0 in reply to Miguel Robertson
    TI__Expert 4260 points

    Hi Max,

       Thank you for your help here. I need to find opportunity to do test in customer side. Will update it to team if any result got.