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EM1402EVM: EM1402EVM Startup

Yoshinobu Kagawa
Expert 2020 points
Part Number: EM1402EVM
Other Parts Discussed in Thread: BQ76PL455A-Q1

The customer purchases two EM1402EVM and wants to perform cell balancing of 28-cells.
So, the question.

1. Which part needs to be changed to use the sample software of EM1402 for 28cell? (EM1402EVM Example Code 0.1 installer.exe)
2. Is there a GUI to check the operation of EM1402EVM?
3. Please tell me how to confirm the operation of EM1402EVM.

4. How should I set SW1 (DIFF / SINGLE) Select for each EVM? (Both DIFF?)  

  • 0
    TI__Genius 10785 points

    HI Kagawa-san,

    Please check this site 1st.

    Single is for base evm(connected to host) and Diff for stacking.

    Roger

  • 0 in reply to Roger Hwang
    Expert 2020 points

    Hi Roger-san,

    I can't download the bq76PL455A-Q1 EVM GUI.

    Is there abailable now ?

    Best regards,

    Kagawa

  • 0 in reply to Yoshinobu Kagawa
    TI__Genius 10785 points

    HI Kagawa-san,

    Check this site..

    Roger

  • 0 in reply to Roger Hwang
    Expert 2020 points

    Hi Roger-san,

    12V mentioned in the manual is recognized as "12V battery". Is it correct?
    Is there a way to not use the battery?
    Customers want to balance their batteries outside the car.

    Kagawa

  • 0 in reply to Yoshinobu Kagawa
    TI__Genius 10785 points

    Hi Kagawa-san,

    No, total input voltage should be 12V.

    Can you tell me how many cells and chemistry?

    I recommend to use PL455A without active cell to balance the cells.

    It's much easier to perform.

    thanks

    Roger

  • 0 in reply to Roger Hwang
    Expert 2020 points

    Hi Roger-san,

    1. Customer wants to Active Balance 28-Cell (Li-Ion).
    2. Customer has two EM1402EVM and TMS570LS LaunchPad ™.
    3. Customer wants to use an 8Vx2 (16V) battery as an external power supply.
       Is there no problem?
    4. I understand that EM1402EVM Example Code 0.1 Sample Code will execute Active Cell Balance.
       Q1) In this case, do I need to start the bq76PL455A-Q1 EVM GUI?
           Customers are monitoring the Cell voltage externally.
       Q2) If you do not use the GUI, would you please provide Sample Code to select Cell and set Balance Enable in Sample Code?

    Kagawa

  • 0 in reply to Yoshinobu Kagawa
    TI__Genius 9401 points

    Hi, 

    Regarding your question #3, EM1402EVM was designed for 12V external supply. 

    For question #4 Q1, you can use the bq76PL455A-Q1 GUI to monitor the cells while you are balancing. The active balancing is done in the sample code, not the GUI. The GUI is just for monitoring.

    For questions #4 Q2, the example code you referenced is the only available code we have for this.

    Best regards,

    Leslie

  • 0 in reply to Leslie Marquez
    Prodigy 20 points

    Hi, Leslie-san

    I would like to know the conditions of starting balancing cells.

    1.Under the following conditions, EM1402EVM started balancing cells.
    cell1 : 3.925934 V
    cell2 : 3.915253 V
    cell3 : 3.912125 V
    cell4 : 3.917236 V
    cell5 : 3.958130 V
    cell6 : 3.871384 V

    2.Under the following conditions, EM1402EVM did not start balanceing cells.
    cell1 : 3.673477 V
    cell2 : 3.673935 V
    cell3 : 3.613052 V
    cell4 : 3.464127 V
    cell5 : 3.663254 V
    cell6 : 3.701172 V

    The voltage difference between the highest voltage cell and the lowest voltage cell of #2 is bigger than that of #1.
    Why did EM1402EVM not started balancing cells under the #2 conditions?

    Best regards,

    Kimata

  • 0 in reply to user6192701
    TI__Genius 9401 points

    Hi Kimata,

    If you are using the example code, it only supports 16 cells. I see from your measurements that you only have 6 cells. Please try with 16 cells.

    Regards,

    Leslie

  • 0 in reply to Leslie Marquez
    Prodigy 20 points

    Hi Leslie-san,

    Thank you for your response.
    But, the code changed for 6 cells, and the LED on the EM1402EVM indicating active is flashing.

    Is there the conditions of voltage or other for balance control or not?

    Best regards,

    Kimata

  • 0 in reply to user6192701
    TI__Mastermind 19795 points

    Hi Kimata,

    Thank you for the clarification!

    Unfortunately we cannot support major modifications to the source code for the EM1402EVM, which includes modifications of the number of cells. The code requires major changes to support different cell counts (e.g. changes to averaging algorithms). Please utilize 16 cells and revert the source code to its original state for us to better support your issue.

    Regards,

    Vince