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bq34z100-G1 Design procedure steps

Drahomir Komar
Prodigy 70 points
Other Parts Discussed in Thread: BQ34Z100, BQ34Z100-G1, BQSTUDIO

Hello guys.

Finally I got EV2300 and did set all the batt parameters and Calibration. I have a few questions, thanks for answers in advance.

1. I went through Step by step Design Procedure and went to Preparing Optimized Default Flash... (SLUA334B) and not sure what is step 3.5 - Write a .senc file with the correct chemical ID to clear the hidden data-flash constants. Could you pls. explain this step?

2.  In same document in step 3.7 this means to save golden Image, correct? As now it has extension .srec

3. CC offset can not be modified. I was able to modify it on bq34z100. Is this ok? I have value there -1414 for G1

4. When I set SCALE flag, should also Current reading be multiplied by Design scale number? Does it mean I can run more then 32.76A over Shunt resistor when max voltage between SRP and SRN maintained under 0.125V?

My setup:

Chem ID: 0x2020 (Panasonic NCR18650PF 13S3P)

Design Capacity:  8640 mAh

Design Energy: 32000 mWh

Pack config A - SCALED: 0 VOLTSEL:1

Series Cell:13 

Qmax Cell0: 8640

CC gain: 5.24

CC Delta: 5.229

Board offset: -72

Volt divider: 56088

Thanks

  • 0
    TI__Guru 73830 points

    Drahomir,

    Here are some answers to your questions.

    1. I went through Step by step Design Procedure and went to Preparing Optimized Default Flash... (SLUA334B) and not sure what is step 3.5 - Write a .senc file with the correct chemical ID to clear the hidden data-flash constants. Could you pls. explain this step?

    [ANS]   The data flash memory has some parameters that are not included in the gg file, so you should program the device with the default srec file to initialize these parameters. You then need to load the chemistry data to program the OCV table, etc. Finally, you need to load the golden gg file to program your parameters and the optimized Ra tables and Qmax parameters.

    2.  In same document in step 3.7 this means to save golden Image, correct? As now it has extension .srec

    [ANS]   The bq34z100-G1 offer three options to save the a golden file that can be programmed into production packs. The srec is a Motorola SREC format and it contains the full flash memory. The df.fs is a text format and it contains the I2C commands and data to program just the data flash memory. the bq.fs is a text format and it contains the I2C commands and data to program the full flash memory.

    3. CC offset can not be modified. I was able to modify it on bq34z100. Is this ok? I have value there -1414 for G1

    [ANS]   The gauge will calibrate the CC Offset parameter itself. Manual calibration is not available or required.

    4. When I set SCALE flag, should also Current reading be multiplied by Design scale number? Does it mean I can run more then 32.76A over Shunt resistor when max voltage between SRP and SRN maintained under 0.125V?

    [ANS]   Yes, more than 32A can be supported with current scaling and the sense resistor needs to be sized to keep the voltage across the SRP and SRN inputs lower than 125mV.

    Tom

  • 0 in reply to ThomasCosby
    Prodigy 70 points

    Hello Tom.

    Thanks for quick answer, now i is litle more clearer to me. I had to go through the pdf Fuel Guage 5 times. ;)) Just going through IT discharge, so lets see if I get the Status update register changed and Max Error updated.

    In first question to load the chemistry data and OCV, it is to pick correct battery cell under Chemistry programming and hit Update chemistry from database button. Correct?

    Cheers.

  • 0 in reply to ThomasCosby
    Prodigy 70 points
    Hello Thomas.

    I am following your steps. When I program device with default .srec file. I am unable to load anything as then I have low voltage (BATTLOW flag set) and no data mem write possible. I have 13S

    Also, when I Import Data mem .gg file it does not change calibration parameters (others are uploaded). Should I go again through Calibration to update these params? Or is this some bug of bqStudio?

    Thanks
  • 0 in reply to Drahomir Komar
    TI__Guru 73830 points
    Check to make sure that the CALEN flag is set. This will allow the device to be configured under low voltage conditions. You should be able to send the CALEN command, if it is not enabled. You can used the "Advanced" import option and enable the import of calibration data. It is disabled with the general import selection.