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bqEVSW Calibration Issue with bq3060

Daniel Rowan
Prodigy 115 points
Other Parts Discussed in Thread: BQEVSW, BQ3060

Hello again,

I am having trouble figuring out what I need to do or step I am missing that will allow me to change the number of cells defined under the calibration screen using .64 of the bqEVSW and the bq3060 Eval Board. My stack consists of two cells but the option to change the quantity of cells is set at 3 and grayed out. I can't change it. I believe I have configured the Flash Data correctly to the best of my interpretation of the documents I have at hand. There are a number of the values that I am not certain on and could not find any documentation that elaborated more on what is expected so I left those at a default state.

I am following the somewhat limited EVM instructions in the sluu342 document which mentions to search for "bq3060 Calibration Using EV Software" for more detailed instructions but I have not been able to locate this document... I attempted to simply calibrate the voltages as is with it stuck at 3 cells, I did not get any errors. I however can't seem to turn on the FETs manually for the current calibration. Checking the Safety Status, I see CUV is set. I don't know if this is related to the fact that it thinks I have 3 cells or maybe some other value is in error?


Thanks again for the help,

Daniel

  • 0
    TI__Genius 10225 points

    The CC0 and CC1 bits in Operation Cfg A in the Configuration class of data flash can be manually configured change the cell count. A reset may be required for the change to take effect. Set CC1 to 0 and CC0 to 1. After changing, send command 00041 to Manufacurer Access to reset.  This is what is causing your CUV as well. Please download SLUU319. This describes all of the firmware features in detail.

    http://www.ti.com/litv/pdf/sluu319

    FET Control can be accomplished through extended SBS command 0x46. Send 0x0006 to turn both the CHG and DSG FETs on and send 0x0000 to turn them off again.

  • 0
    TI__Prodigy 195 points

    The cal page in 3060 EVSW looks at the first byte in the second page of DF . This corresponds to Op Cfg A

    Based on DF value, it updates cell count in Cal screen

    The cell count is an indicator, not a control ,  user cannot change number of cells on cal screen

  • 0 in reply to Chase7071949597
    Prodigy 115 points

    I updated the Cfg A register and it is now reporting 2 cells. The CUV has cleared and I can control the FETs now. I did not know it was just an indicator as described above and thought I goofed on some other part of the Data Flash settings and that was why it was grayed out. Thanks for the help.