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SN65HVD230

hj
Intellectual 650 points

Other Parts Discussed in Thread: SN65HVD230, SN65HVD233-EP

I am using  the sn65hvd230. While it is in standby mode it is still drawing 37.33mA without any CAN signals.  I know this isn't right.  The current is supposed to be in uA.  Is there a common reason for this?

  • 0
    Guru 22270 points

    Hello HJ,

    Have you verified that there is a high (VCC) getting to pin Rs?

    Are you actually measuring the current draw of the CAN controller or the entire system with the MCU?

    Thanks,

  • 0 in reply to Greenja
    TI__Mastermind 20600 points

    Hello HJ,

     

    In addition to making sure you are actually putting the part into standby mode with a pull up to Vcc you can also look into the following other points.

    1) conditions on all the pins.  There may be conflicting pull up / pull down resistors burning extra current.  these are not part of the ICC to the device.

    2) Are you sure you are measuring only Icc to the device or all components connected to Vcc?

    3) Bus conditions.  If the bus is not recessively biased but shorted to other voltages you may be pulling current out of the device.

    4) Have you checked the current in the high speed or slope modes but with D recessive (high), then D dominant (low) vs the current in standby mode?

    -- Scott

  • 0 in reply to Scott Monroe
    Intellectual 650 points

    Thanks. I also have one more question about the SN65HVD233-EP.

    If the transceiver doesn't have VCC supplied, is it harmful to the transceiver if the CAN H and CAN L remain active from other modules?

  • 0 in reply to hj
    TI__Mastermind 20600 points

    Active bus voltages will not damage an un-powered HVD233 assuming they stay within the specified absolute maximum range of +/-36V for the device. 

    An unpowered HVD233 will present a bus load to the powered nodes.  This loading needs to be considered with respect to the number of nodes and other network length and topology if it can be tolerated or not. 

     

    -- Scott