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BQ76PL455A-Q1: bq76PL455A

Part Number: BQ76PL455A-Q1

Hi

I am using the BMS reference design. The chip (and example code) support both charge and discharge. I was trying the discharge, but it didn't appear to work. Is the reference  design capable of discharging the cells? If not what is required to have that work?

Thanks,

Malcolm 

  • Hi Malcolm,

    Can you point out which reference design you are referring to?

    thanks

    Roger

  • Hi Roger

    It is the EM1402 Evaluation Module (TI BD76PL455A-Q1 Reference Design).

    Malcolm

  • Hi Roger

    It appears that it should be able to discharge based on the documentation. I am not sure why I don't see any cell change when I try to discharge or charge. Is there some documentation that describes how to perform a charge or discharge? Let me know if you find out whether the design supports the discharge.

    Thanks,

    Malcolm

  • HI Malcolm,

    Can you share block diagram of  how you perform discharging test?

    Roger

  • Roger Hwang said:

    HI Malcolm,

    Can you share block diagram of  how you perform discharging test?

    Roger

    Hi Roger,

    For the software block diagram:

    1) Read the voltages of the cells and temperature 

    2) Determine the maxCell and MinCell voltage

    3) Call EMB_Start(0, maxCell, discharger) (This uses calls to register 121)

    4) Delay 1 to 10 seconds

    5)Delay 3 seconds

    6) Repeat back to step 1)

    Here are the answers to your questions:

    1) Cell values:

    1) 2.234

    2)2.136

    3) 2.287

    4) 2.258

    6) 2.2189

    7) 2.21134

    8) 2.231

    9) 2.331

    10) 2.134

    11) 2.2089

    12) 0.0061

    13)0.0060

    14)  0,067

    15) 2.214

    16) 2.215

    *Note - In previous measurements the voltages measured for 12, 13, 14 were ok, but cells  4, 5, 6, 7, 8 were in the 0.006 range. So these low voltages appear to move around.

    2) Register values for:

    register 13 was 0x10

    register 14 0x18

    Any advice is appreciated.

    Malcolm

    Is this the recommended approach? Do you have other examples?

    Thanks,

    Malcolm

  • Hi Malcolm! 

    I'm going to go ahead and close this thread too since we are already handling this issue on your other post. I just want to avoid any confusion and to have all the information on a single thread. 

    Best regards,

    Leslie