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BQ40Z50-R1: while reading the battery data PEC error occurred.

Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: BQSTUDIO, EV2400

Hi Team,

I am using Smart battery in my product. While I am reading the battery voltage or current I'm getting the PEC error in smbus line. In  smbus line connected the 3 devices, Host(mcu (stm32h7)), Master(Battery) and Slave (charger IC).

Please advise how to solve this issue.

Here i have attached the communication part.

smbus_communication.cpp

  • Hello Vel,

    We cannot help debug your code for errors as the functions used are different for each customer.

    You can look at the TI tool chain for checking the communication of your code using the EV2400 with bqStudio. Was the PEC byte calculated wrong? What exactly is the error you're getting?

    Sincerely,

    Wyatt Keller

  • Hi Wyatt Keller,

    Calculated PEC Value is correct. while reading temperature, battery is returning temperature value as 0.

    I'm calculating  PEC value using device address, r/w and data.

    The calculated PEC value and received PEC value from battery are same. The issue is battery is sending wrong data randomly. For example see the screenshot below, battery is sending temperature value as 0, but the actual value is 02785. Facing same issue in SOC value too.

    Thanks,

    vel

  • Hi Vel,

    Please upload the .gg and log showing this behavior and we will take a look.

    Best regards,

  • Hi Nick Brylski,

    Thanks for your response. Please find the .gg and log file.

    [14:58:59:822] BV:16641,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [14:59:01:802] BV:16641,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [14:59:03:830] BV:16641,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [14:59:05:827] BV:16641,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [14:59:07:807] BV:16641,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [14:59:09:819] BV:16641,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [14:59:11:832] BV:16641,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [14:59:13:828] BV:16641,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [14:59:15:809] BV:16641,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
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    [15:00:53:824] BV:16642,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
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    [15:00:57:817] BV:16643,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
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    [15:01:03:790] BV:16642,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:01:05:819] BV:16642,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:01:07:815] BV:16643,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:01:09:795] BV:16642,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:01:11:824] BV:16643,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:01:13:820] BV:16642,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
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    [15:01:29:823] BV:16643,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:01:31:820] BV:16642,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:01:33:816] BV:16642,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:01:35:828] BV:16642,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:01:37:793] BV:16642,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:01:39:821] BV:16642,CC:00000,TEMP:02885,RSOC:00099,ASOC:00101,BS:00231,␊
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    [15:04:19:790] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:04:21:818] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
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    [15:11:53:787] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:11:55:767] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:11:57:796] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:11:59:792] BV:16643,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:01:772] BV:16643,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:03:785] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00099,BS:00231,␊
    [15:12:05:765] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:07:793] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:09:774] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:11:787] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:13:799] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:15:763] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:17:792] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:19:772] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:21:785] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:23:797] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:25:762] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:27:790] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:29:770] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:31:799] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:33:763] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:35:791] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:37:788] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:39:784] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:41:764] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:43:793] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:45:773] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:47:785] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:49:798] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:51:762] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:53:791] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:55:787] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:57:783] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:12:59:796] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:01:760] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:03:789] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:05:785] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:07:765] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:09:794] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:11:758] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:13:787] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:15:783] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:17:763] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:19:792] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:21:756] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:23:784] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:25:781] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:27:793] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:29:790] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:31:770] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:33:782] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:35:794] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:37:791] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:39:755] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:41:784] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:43:764] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:45:793] BV:16641,CC:00000,TEMP:02785,RSOC:03016,ASOC:00101,BS:00231,␊
    [15:13:47:789] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:49:770] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:51:782] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:53:762] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:55:791] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:57:756] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:13:59:784] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:14:01:780] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:14:03:761] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:14:05:789] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:14:07:770] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:14:09:782] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:01:778] BV:16641,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:03:743] BV:16640,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:05:771] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:07:751] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:09:780] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:11:744] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:13:772] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:15:769] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:17:765] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:19:778] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:21:774] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:23:803] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:25:751] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:27:764] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:29:776] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:31:773] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:33:801] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:35:749] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:37:778] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:39:742] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:41:770] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:43:767] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:45:747] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:47:775] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:49:756] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:51:768] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:53:765] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    [15:19:55:777] BV:16642,CC:00000,TEMP:02785,RSOC:00099,ASOC:00101,BS:00231,␊
    
    
    P-8A.gg.csv

    Thanks,

    vel

  • Hello Vel,

    Is this error still occurring with bqStudio and the EV2400? For the SBS commands you don't need to use the PEC byte, if you don't use the PEC does this error still happen?

    It's also common to have some error filtering on the firmware side to discard any erroneous readings.

    Sincerely,

    Wyatt Keller

  • Hi Wyatt Keller,

    I'm communicating via stm32 controller.  While reading the battery voltage or current, that value was unexpected. while debugging, the smbus clock signal was not correct. In smbus line three devices were connected, Host(mcu (stm32h7)), Master(Battery) and Slave (charger IC).

    Attaching screenshot for your reference:-

    what could be the reason for this?

    Thanks,

    Vel

  • Hello Vel,

    Are you having collisions on the communication lines? The slave won't alter the clock unless it needs to clock stretch, is your MCU capable of clock stretching?

    Sincerely,

    Wyatt Keller

  • Hi Wyatt Keller,

    Yes, my MCU capable of clock stretching. As you suspected clock stretching was the problem. Now my issue is solved,

    Thanks,

    Vel