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Original question:

SN65HVD232: communication instability

SN65HVD232: SN65HVD232

vvn
Prodigy 50 points
Part Number: SN65HVD232

Hi, Im using SN65HVD232 in my design suppled with 3.3V. but the CAN High voltage im is getting 3.6V whereas as per datasheet CANH voltage level is is 2.45 to VCC.


  • 0
    Guru 283030 points

    It is not possible for this driver to drive higher than its own supply.

    Is this packet really sent from this SN65HVD232? The ACK bit shows that there are multiple transceivers on the bus.

    Is the ground the same at the transceiver and at the place where you are measuring?

  • 0 in reply to vvn
    TI__Mastermind 32773 points

    Hi Vvn,

    Due to MLK weekend, please expect delayed responses from TI until Tuesday, 1/17.

    Regards,

    Tyler

  • 0 in reply to Clemens Ladisch
    Prodigy 50 points

    Hi Clemens,

    There are other transceiver on the bus . Measuring ground is the same as SN65HVD232 ground.

    Is there any chance SN65HVD232 is faulty?

  • 0 in reply to vvn
    TI__Guru 50795 points

    Hi Vvn,

    Because SN65HVD232 is supplied by a 3.3V rail, it is not possible for this device to generate a voltage of 3.6V. This CANH level is much more typical of a 5V supplied transceiver. Have you tried disconnecting the SN65HVD232 node from the rest of the CAN bus the take this measurement? You may also be able to find a different CAN frame that is driven by the 3.3V transceiver on the scope by capturing a few times until you see the correct voltage levels or by triggering off of the TXD signal of the SN65HVD232 if this is accessible. Make sure that this CAN node has data to transmit and is not just a passive listening node. 

    Regards,
    Eric Schott