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BQ29330: Calibration of BMS pcb directly using bq20z90 and bq29330

Steve Gee
Prodigy 40 points
Part Number: BQ29330
Other Parts Discussed in Thread: BQ20Z90, , BQMTESTER, BQEVSW

Hi,

I have been using a bqMTester Calibration Board and the bq Mullti-station Tester Software v1.50 to calibrate a BMS pcb with modules bq20z90 and bq29330, adjusting the voltage and current readings manually every hour with Update VTI, I am now looking at doing this with a LabVIEW program so I can take calibration values of voltage, current and temperature at the time of calibration for every BMS unit.

Do I need to use the bqMTester board? is there a way (formula) to calculate the cal. values (Gain, Delta etc.) needed from the direct measurements and program them directly to the units? from slua379.pdf. Would I need to send a command and tell it what the voltage is, and then for current and temperature?

Has anyone done this before in LabVIEW or similar?

Any help would be greatly appreciated

Best wishes,

Steve

  • 0
    TI__Guru** 103925 points

    Hello Steve,

    We actually do not support the BQMtester any longer, you can follow the attached guide for calibration of the BQ20z90, you do not need to use BQMtester for calibration.

    We do not have any support for LabVIEW integration, so you would need to implement this yourself using some type of USB-I2C/SMBus adapter that is compatible with LabVIEW.

    /cfs-file/__key/communityserver-discussions-components-files/196/slua355b.pdf

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 40 points

    Hi Wyatt,


    Thanks for your response, I though as much that it could be done real time, do you know where I could get the commands needed to send the measured values to the device to calibrate it, and perhaps an example, it doesn't seem to be very clear in any of the pdf's I have looked at?

    TIA,

    Steve

  • 0 in reply to Steve Gee
    TI__Guru** 103925 points

    Hello Steve,

    The commands to calibrate the gauge are given in the code example from the PDF I linked above, I would use those as a reference for calibration.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 40 points

    Hi Wyatt,

    I appreciate that it is documented in that pdf, I was after an example with some values in to see what it looks like as I am using NI-VISA to write to the device using an EV2300 for SMBus interfacing, for example what commands would you send if the calibration measurements were, 1 volt, 1 amp and 20 degrees Celsius?

    Thanks,

    Steve

  • 0 in reply to Steve Gee
    TI__Guru** 103925 points

    Hello Steve,

    Unfortunately I don't have any direct examples of the app note with a certain voltage and current used for calibration. It should give you all the steps needed though to do the calibration and verify on the board. If you want an example you can use a logic analyzer with BQEVSW calibration to see all the packets that are sent.

    Sincerely,

    Wyatt Keller