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BQ34Z100-G1: ChemID

Jeffrey Wright
Expert 2875 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ78350, BQSTUDIO

Hello;

My client's product requires the host u/P to program all gauge parameters during initial system startup. This includes the Ra tables for the cell chemistry used. The addresses for the Ra tables are listed in the TRM and so I can program the values.  But I assume there's also a SOC vs. OCV table (?) which I must also program. And I assume, just as with the bq78350, that it's at a hidden/private class/address (?). If so, how can I find where to program the SOC vs. OCV table for the specific cell chemistry?

  • 0
    TI__Guru** 105760 points

    Hello Jeffrey,

    Yes that's correct, the OCV and other values are hidden. I would recommend you use the bq.fs file for production programming. You can follow the gauge communication application note regarding the programming of the FS files.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Expert 2875 points

    Let me repeat...my client's application F/W is programmed EOL over CAN - not I2C. It is a closed system with no access to bqStudio. IT learning will be conducted on the bench in a prototype, and the relavent IT parameters will then be linked into the application F/W for programming over CAN. 

    I've had no problem working with TI on the 78350, and the support engineers readily provided my the address of the table. Please provide this information. I can generate the files from Studio, and include in the application's F/W, but I need to know where the table is located and its size.

    This is urgent. 

    Thank you.

  • 0 in reply to Wyatt Keller
    Expert 2875 points

    I was just sent a presentation "Battery Fuel Gauging Deep Dive: Characterization,programming, and going to production with TI's impedance track algorithm."

    Within, it references appnote SLUA801 which includes a C routine to parse a "Flash Stream" file and write it to the gauge. So is my understanding correct that I can simply implement this routine on my host u/P and program the 34z100 by opening and parsing the *.bq.fs file?  The code uses only a "test.gm.fs" file, which a golden image file for ROM gauges. So if I load the 0100_0_16-bq34z100G1.bq.fs file generated by studio, does that contain the Impedance Track ChemID parameters?

  • 0 in reply to Jeffrey Wright
    TI__Guru** 105760 points

    Hello Jeffrey,

    Yes that's correct, if you use the parser in the gauge communication application note it will upload all the parameters to the gauge (using bq.fs) and only the data flash values if you use the df.fs. gm.fs is the example, but it will work with any flash stream file.

    Sincerely,

    Wyatt Keller