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SN65HVD231: Current draw increases in low power mode.

Jon Hanson
Prodigy 10 points
Part Number: SN65HVD231

Tool/software:

I am using the SN65HVD231 as CAN transceivers on the two CAN channels on an ARM Cortex-M3.  Strangely, when I pull the RS pin high on each of the transceivers to put them in sleep mode, the current draw increases.

Although the datasheet says that the bus-pins are in a high-impedance state, if I disconnect the CAN-H and CAN-L from the transceivers, the current draw goes down when it is supposed to be in sleep mode.

Since the D and R pins are supposed to default to a logic high, I put the respective pins of the microcontroller into a high impedance mode, but that does not help.

Can you please advise what might cause the increases the current draw?

Thanks,

Jon Hanson

  • 0
    TI__Genius 14175 points

    Hi Jon,

    SN65HVD231 was designed to have high impedance bus state in sleep mode, both driver and receiver are disabled, do you mean that it consume more current than in high speed mode? What is the level of current? Is VCC still powered or not? 

    Regards,

    Sean

  • 0 in reply to Sean Guo
    Prodigy 10 points

    Seems the problem lies elsewhere.  When I eliminated all the other circuitry, the transceiver was not drawing more current in sleep mode.  I will close this ticket.