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BQ40Z60: Production steps for BQ40Z60

R D2
Intellectual 265 points
Part Number: BQ40Z60
Other Parts Discussed in Thread: BQMTESTER, EV2400, BQSTUDIO

Hello everyone,

I have found the following pdf www.ti.com/.../slua391.pdf - which describes how the individual production steps should look like.


For the bq40zxx series I only found the following pdf: www.ti.com/.../slua734a.pdf - but here is only commented on the calibration step, not on the whole production process.


So I wonder if the production steps are the same as for the bq20zxx series?
If so, is the use of BQMTESTER Multi Channel Test and Program Board with the BQ40zxx series still reasonable or even obsolete? We use Windows 7/10 as production computer.

Or is there the possibility to automate the production by writing an own program which takes care of the "Golden Image", the calibration and other steps?

Kind regards and thanks

Riccardo

  • 0
    TI__Guru** 105590 points

    Hello Ricardo,

    The flow chart in SLUA391 is still applicable, You can use the golden image to import calibration data as well as dataflash, so some of the first 3 steps will be combined.

    The bqmtester is for use with the bq20zxx and bq20zxx chips, it's not supported with the newest gauges because of the switch to the EV2400. By calibrating a few of your gauges and averaging the calibration values (offsets and gains) you can use this as your golden image to program the gauges in production.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Intellectual 265 points

    Hello Wyatt,

    ok thank you very much for the quick answer. So the only step I have to do with my own developed PCB is to perform a calibration in BQStudio and transfer the calibrated values into my existing "golden image"?
    So that all PCBs to be produced have the calibration values.
    So I would combine the steps 1 and 2 of the flow chart in one and I would only have to take care of steps 3 to 11. Is that correct?

    Kind regards and thanks

    Riccardo

  • 0 in reply to R D2
    TI__Guru** 105590 points

    Hello Riccardo,

    Yes, you will need to average a few of your calibration values from your PCBs and then you can use those values in your golden image file that has all your dataflash programmed, then when you export that file for production (as an .srec or df.fs) it should have all the information necessary for operation.

    Once you have the final golden file you can combine the first three steps and just upload the file with all the settings and calibration.

     Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Intellectual 265 points

    Hello Wyatt,

    Thanks again for the quick and detailed answer. But I still have one question, all calibration values that should be averaged are located at BQSTUDIO under the tab "Data Memory/Calibration"?

    Are other values from the data memory important, which have to be averaged?

    Kind regards and thanks

    Riccardo

  • 0 in reply to R D2
    TI__Mastermind 24870 points

    Hello Riccardo,

    Calibration is the most important.

    If you want, you can average Qmax and Ra tables and V at Chg Term. These are the values learned by the gauge for chemical capacity, impedance, and charge to full voltage.

    These are not necessary, but you can average them for a statistical representation of your batch of cells.

  • 0 in reply to Kang Kang
    Intellectual 265 points

    Hello Kang Kang,

    Thank you very much. That answered all my questions.

    Kind regards and thanks

    Riccardo