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BQ40Z50-R1: SHA-1 Authentication of BQ40Z50 can be read/worte by I2C? or must by SMBUS

Harry Ma
Intellectual 2260 points
Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: BQ40Z50, BQ40Z50-R2, EV2400

 Hi Experts

        Customer can handle the 0x2F by BQ-studio successfully.  it occurred a fault when he handled 0x2F by MCU through I2C，But it‘s ok handle other registers through I2C.  SHA-1 Authentication of BQ40Z50 can be handled by I2C? or just SMBUS, Please help to answer, Thanks!

  • 0
    TI__Genius 11535 points

    Hi Harry,

    They should use SMBUS. 

    Best,

    Jessica

  • 0 in reply to Jessica H.
    TI__Intellectual 2260 points

    Hi Jessica 

         Thanks your support. Customer used C6748 communicate with BQ40Z50-R2. C6748 just includes I2C, but they used the SMBUS data frame to transfer data, and it's successful to access other register. so I think there is a problem with the steps  handling 0X2F of BQ40Z50-R2. Can you show me the right process for handling 0X2F?

  • 0 in reply to Harry Ma
    TI__Guru** 104905 points

    Hello Harry,

    Can you capture the logic analyzer images of the two communications methods (EV2400 and MCU), that should let you see if there's a discrepancy with the way you're communicating.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Intellectual 2260 points

    Hi Wayatt

        Thanks for you guys supports.  this issue has been closed.  you are right! the problem is the discrepancy with the way they are using. The authentication successed after keep the same data sequence as EVM2400.  Thanks again!