• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 32 subscribers
  • Views 150 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SN65HVD232: Unpowered device on bus

Will Jarrett
Intellectual 2640 points
Part Number: SN65HVD232

I have a customer who uses the SN65HVD232DR in an application where one of the modules that uses this transceiver can be offline, that is, unpowered.  What affect does an unpowered transceiver have on the bus?  Does the SN65HVD232DR change the impedance of the CAN bus if it is connected to the bus but not powered?

Thanks!

  • 0
    TI__Mastermind 47895 points

    Hi Will,

    When the device is unpowered, SN65HVD232's CAN bus pins will remain in a high impedance state so that they do not disturb the bus. The presented bus load will be slightly different than when the transceiver is powered and in a recessive state because the recessive-level biasing circuit will not be provided Vcc. See Figure 27 on the datasheet for the input circuit schematic. 

    Let me know if you have any more quetions.

    Regards,
    Eric Schott