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BQ3050: The value 0x1f(CC Offset with CAL=1 ) in the a few BQ8050 factory calibration parameter may be to be unverified

zehu chi
Intellectual 445 points
Part Number: BQ3050
Other Parts Discussed in Thread: BQ8050

Tool/software:

Hi TI engineer:

        I have a question about the BQ8050 factory calibration parameter, and hope to get a reply

        Our software logic is such that:

        1.we will first save the values of the IFIB Data Storage as default values.

        2.After the voltage and current calibration operation is performed on the production line, the obtained calibration value is stored in the EEP 

        3.If the data in the EEP is lost for some reason, our program will use the saved default value(The values of the IFIB Data Storage ).

        However, recently we have found a rare case where the sampling current is about negative 1A in the absence of current,as shown below

        

        Does it seem that the value in IFIB Offset memory space 0X1F is ff ff caused this phenomenon ?

        It is found that the description in the specification is the bq8050/55 contains a memory space that stores various factory calibration data values,But why a few of our BQ8050's zero currents differ by nearly 1A?

 the value in IFIB Offset memory space 0X1F is ff ff,does it mean that these BQ8050s have not been factory calibration ?

Looking forward to your reply! thank you!

  • 0
    TI__Guru 61126 points

    0xFFFF means that the CC calibration info was either not written to IFIB, IFIB was erased or by coincidence calibration matches erased IFIB. It's not possible to say what the cause was in your examples without further investigation (you'd have to return affected devices to TI so that we can check if there's a record from ATE that IFIB wasn't written).

  • 0 in reply to Dominik Hartl11
    Intellectual 445 points

    Hi ,

            Thank you for your reply, which has solved some of our doubts. We also want to ask you to help confirm some information. In fact, we read data in the IFIB from 10 BQ8050 chips for analysis, and here are the details

    For example, the return value of IFIB Offset memory space 0X1F for serial number 3, serial number 7 and serial number 8 is ff ff,So are the other values in IFIB Offset memory space accurate or not ?

    The CC calibration info in these three chips may be ff ff for some reason, resulting in zero currents abnormal, Then from the IFIB data of these three chips shown in the table, how should we check  whether the voltage, NTC and other calibration values are success written in IFIB Offset ?  whether only the CC calibration info is abnormal

    Looking forward to your reply! thank you!

  • 0 in reply to zehu chi
    TI__Guru 61126 points

    There is no approved method to determine if the other values are correct. These aren't supposed to be used directly by a customer so we do not have collateral that I can share with you. That all instances of grossly incorrect error have 0xFFFF for CC Offset indicates that something went wrong when this IFIB was written. The support model requires that these be sent in to TI so that we can check if there's anything in the ATE logs for these units that would explain the observations.