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SN65HVD231: SN65HVD231 lost frames

Darren Yang
Expert 2000 points
Part Number: SN65HVD231

We use the SN65HVD231 in T-BOX，now we find one question is SN65HVD231 lost frames During transmission，What aspects are caused will be cause it ？could you help it and give me some suggestion how to solve it，tks！

  • 0
    TI__Guru 62920 points
    Hi Darren,

    Would it be possible for you to measure the CANH and CANL waveforms on an oscilloscope when the issue is occurring? That should give us a better idea what might be going wrong and resulting in lost frames. You could also check the TXD input to the device and the RXD output to verify whether it is working as intended.

    Regards,
    Max
  • 0 in reply to Miguel Robertson
    Expert 2000 points
    Hi Robertson，because the problem of SN65HVD231 is happen in end customer car so we cannot reappear lost frames to measure the CANH and CANL waveforms，so we want to konw What aspects are caused will be cause it ？form the Schematic how we can do it。thx！
  • 0 in reply to Darren Yang
    TI__Guru 68512 points

    Darren,

    Typically, when frames are lost the causes are: 

    1. Noise entering the bus and corrupting the transmission signals.

    2. Incorrect termination resulting in reflections and incorrect voltage levels of the transmission signals.

    3. Too much capacitance on the bus, resulting in "roll-off" of the waveform and the receiver incorrectly interprets the signals.

    Along with several other reasons.

    The termination looks correct in using the SPLIT pin, so I don't think that's the issue here. There is quite a bit of capacitance on the bus with the 100pF capacitors and the ESD diode, but not enough to cause message interpretation issues from my experience.

    What kind of supply is being used to power VCC?

    If the customer can lower the amount of capacitance on the CANH and CANL lines and still sees an issue, that can be ruled out. Also, what else the CAN bus connected to? 

    To really solve this issue, waveforms would be extremely helpful, so if there is any possible way of getting oscilloscope image captures, please do.

    Regards,