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EM1402EVM: Cells not balancing when "Balance ON" is engaged

Tien Dao
Prodigy 20 points
Part Number: EM1402EVM
Other Parts Discussed in Thread: BQ76PL455A, TMS570LS0432, LAUNCHXL-TMS57004

HI,

I am not sure why I am getting this. When I start the poll, the voltages fluctuate, but whenever I try to balance the cells, the voltages just flat out. I have double and triple checked all the connections, replaced any batteries (if necessary),use brand new 1402EVM and TMS57004 Launch boards, re-download the bq76PL455A GUI, CCS, and TMS570BMS codes but so far, this is all I've been getting. I noticed that when I start balancing the cells, the LED D4 lights up once and never lights up again. I have also tried this on another computer and the result is exactly the same.

Any help would be great.

Thanks.

  • 0
    TI__Genius 11480 points
    Hi Tien,

    Have you made the required modifications to the TMS570LS0432 Launchpad?

    Could you share a picture of your setup with me please? I can also help double check.

    In my opinion, I think the TIDM is tough to use and follow. I would recommend starting with the EM1402 Example Code and using a current probe to watch the balance current.
  • 0 in reply to David Wiest Jr
    Prodigy 20 points

    Hi David, 

    Yes, I have modified my LaunchXL-TMS57004 board by removing the R8 and R9 resistors and connecting the signal to J4-2 and J4-1 pins respectively.

    I have never been able to make the 1402 Example code to run. The example code works fine when building and debugging it in CCS, but when I tried to run the BQ76PL45A-Q1 GUI, an error states that it is "Unable to open COM port" even though I was able to access the TMS570BMS program which gave me the result above

    Also, what is the difference between TMS57004 Launchpad and  TMS570LS0432 Launchpad? I have read previous E2E posts that shows that the TMS57004 Launchpad has work with some levels of success, such as this post.

  • 0 in reply to Tien Dao
    TI__Genius 11480 points
    Hi Tien,

    I believe they are the same thing.

    There are also two different sets of code - the TMS570BMS example code, and the EM1402 example code. The EM1402 Example code was not intended or developed to use a GUI, which is likely why you have difficulty with it.

    Is there any chance you can capture the UART and SPI traffic to see what is happening? I recommend walking through the code to see where the failure is as well.