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BQ40Z50-R2: Problem with initial programming of single cell application

Torsten Dense
Prodigy 20 points
Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQSTUDIO

Tool/software:

Hello,

I have a problem with a new designed PCB in single cell configuration. The cell inputs VC1-VC4 are connected together. On the cell and on the output side a stable voltage is applied. The communication to Battery Management Studio 1.3.125 works, but the device does a continious restart event. Unfortunately it is not possible to change DA configuration or write SREC or GG file, so I expect device recognizes a permanent fail because of cell voltage low. 

How is the procedure to initially configurate as 1-cell application device? Which steps can we do to prevent shutdown, before setting  the right cell configuration?

Thanks


Torsten

  • 0
    TI__Mastermind 28480 points

    Hi Torsten,

    During this time, a way to keep the gauge awake is to connect the BAT and PACK+ lines temporarily until the DA configuration is changed. Once this has been changed, the connection can be removed and the gauge should not immediately fall into shutdown or lose communication.

    Regards,

    Anthony Baldino 

  • 0 in reply to Anthony
    Prodigy 20 points

    Hello Anthony,

    I have tried this several times, unfortunately the connection is lost before datamemory is read out, so no setting is possible. Is there any effect which can force a faster shutdown- beside the voltage checks?

    Thanks

    Torsten

  • 0 in reply to Torsten Dense
    TI__Mastermind 28480 points

    Hi Torsten,

    What is the cell voltage of the cell being attached? Is the BAT/PACK connection being held the entire time the gauge is attempted to be communicated with or is it being removed when the bqStudio connection is being initialized? 

    Regards,

    Anthony Baldino

  • 0 in reply to Anthony
    Prodigy 20 points

    Hello Anthony,

    I tried with different voltages on cell e.g. 3.7V on cell connection and 4.2V on PACK side. Also tried 4.2V / 4.2V. The voltages are constant when try to communicate with BQ Studio. 

    With one PCB I also tried a 3S voltage on the PACK side (11.1V) and 3.7V on cell side without success. The communication starts and somtime I can read out most of the setting, but then the communication is interrupted.

    Thanks

    Torsten

  • 0 in reply to Torsten Dense
    Prodigy 20 points

    Now it works. I found a soldering problem on controller. Sorry for the effort. 

    Programming works with 4V on cell input and 4.2V on BAT input.