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DRV8889-Q1: When one driver fails do others could still work normally

Zirui Su
Expert 5340 points
Part Number: DRV8889-Q1

Hi team

I would like to ask a  question that related to daisy-chain and parallel topology:

Here I summarize a excel file for daisy-chain connection and parallel connection, we need your confirm whether it is right since we do not find some related instructions in the datasheet.

Copy of DRV8889 Issue Description.xlsx 

My main question is:

For the two connection methods (Daisy Chain and Parallel), do they support that if one of the ICs fail, and the other ICs can work normally? Please help me to fill the blank, thank you very much in advance.

  • 0
    TI__Guru 56650 points

    Jerry,

    The comments about SPI open or short in the excel file is correct.

    If one of the ICs fail itself, and the other ICs can work normally..

    Regards,

    Wang Li

  • 0 in reply to Wang5577
    TI__Expert 5340 points

    Hi Wang Li

    Thanks for your reply. You said if one of the ICs fail itself, other ICs could work normally and related to SPI fault the excel file comments are right? Could SPI port open/short cause the IC fail? So in that condition (not IC fail it self) will other IC work normally both in daisy chain and parallel connection? 

  • 0 in reply to Zirui Su
    TI__Guru 56650 points

    Zirui,

    "IC fail itself" means the fault condition in table 7-10. If one SPI port is open/short, it could affect all the ICs in daisy chain (other ICs may not work as normal condition.

    Regards,

    Wang

  • 0 in reply to Wang5577
    TI__Expert 5340 points

    Hi Wang Li

    Thanks for your clarification and what about the parallel connection situation? Does the SPI open/short also affect the IC work condition in parallel condition? Or could other ICs work normally when one IC fail itself in parallel condition, thank you. 

  • 0 in reply to Zirui Su
    TI__Guru 56650 points

    Zirui,

    In paralleling condition, the SPI open device won't affect other devices. Other devices can work normally. 

    In paralleling condition, the SPI short device could short other devices if one wire is connected to multiple devices.

    Regards,

    Wang Li