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Original question:

ISO1042-Q1: Automotive Iso can bus with SAE J2284-1~5

ISO1042-Q1: ISO1042-Q1: Automotive Iso can bus with SAE J2284-1~5

Driscoll Tsai
Expert 1590 points
Part Number: ISO1042-Q1
Other Parts Discussed in Thread: ISO1042, ISO7041

Hi Sir,

base on previous question.

https://e2e.ti.com/support/isolation/f/1013/p/781261/2889026#2889026 

our end customer still want to have wake-up function by CAN BUS. (refer to TJA1052i is used in a HS-CAN network that supports remote bus wake-up,)

https://www.nxp.com/docs/en/data-sheet/TJA1052I.pdf 

Does ISO1042-Q1 has similar function or has any another suggested device?

thanks~

Regards,

Driscoll

  • 0
    TI__Mastermind 49345 points
    Hi Driscoll,

    Like Dan has mentioned in in the other post with original question, ISO1042 doesn't have standby mode. Since there is no standby mode implemented and since device will always be awake, wake-up function is not relevant for this device.

    Like Dan already mentioned in the original post, ISO1042 has lower power consumption in normal operation mode than the TJA1052i in standby mode. Hence, customer can achieve lower power operation with ISO1042 even without implementing any wake-up function in their application.

    Let me know if this answers your question, thanks.


    Regards,
    Koteshwar Rao
  • 0 in reply to Koteshwar Rao
    Expert 1590 points
    Hi Sir,

    thanks for your fast reply.
    Actually, it apply at BMS system in e-motorcycle. it is removable BMS, so total quiescent current need below 10uA. The end customer want to use can bus to wake-up when plug-in. Do you has any other device to achieve this purpose?

    Regards,
    Driscoll
  • 0 in reply to Driscoll Tsai
    TI__Mastermind 49345 points
    Hi Driscoll,

    I understand customer concern. Since customer quiescent current requirement is <10uA, I am assuming TJA1052i also cannot be used.

    Unfortunately, we currently do not have an isolated CAN device that supports standby mode and/or wake-up function. If possible, customer may look at using Digital Isolator + CAN transceiver two-chip solution.

    We have an ultra-low power digital isolator (ISO7041) whose quiescent current is very low but it is not automotive qualified, I am not sure if automotive qualification is a mandatory requirement for e-motorcycle. Customer may also have to check if the propagation delay of ISO7041 will be acceptable to support required loop delay on CAN bus.

    Let us know if you have any questions, thanks.


    Regards,
    Koteshwar Rao