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BQ79616: bq79616 + bq79600 reverse direction command frames when BMS is running

zhanglei
Prodigy 70 points
Part Number: BQ79616

Hi !

      We have built a BMS system using bq79616 and bq79600, now we can set up the device address in both communication directions, but  then we can't change the communication direction.

Here is my code：

.WriteReg(0, CONTROL1, 0x0+0x80, 1, FRMWRT_SGL_W); //反向编地址
WriteReg(0, COMM_CTRL, 0x00, 1, FRMWRT_SGL_W);
WriteReg(0, CONTROL1, 0x80, BoardNum-1, FRMWRT_REV_ALL_W);

Best Regards,

  • 0
    Prodigy 70 points

    WriteReg(0, CONTROL1, 0x0+0x80, 1, FRMWRT_SGL_W); 
    WriteReg(0, COMM_CTRL, 0x00, 1, FRMWRT_SGL_W);
    WriteReg(0, CONTROL1, 0x80, BoardNum-1, FRMWRT_REV_ALL_W);

    WriteReg(0, COMM_CTRL, 0x00, 1, FRMWRT_SGL_W);
    WriteReg(BoardNum-1, COMM_CTRL, 0x03, 1, FRMWRT_SGL_W);

  • 0 in reply to zhanglei
    Prodigy 70 points

    The above code is not working properly

  • 0
    TI__Expert 6980 points

    Hello Zhanglei, 

    Have you auto addressed and communicated with the device before executing this code?

     Please review the auto-address directions in the BQ79600 datasheet to make sure you are auto-addressing properly before changing the communication direction.

    Additionally try read the COMM_CTRL register and make sure the BQ79616 is configured properly. The BQ79600 should automatically be configured as the base device with an address of 0x00. 
    You must have a daisy chain cable between COMH of base to COML of Stack1 and a daisy chain cable between COML of base to COMH of Stack1. To communicate in the south direction, set DIR_SEL = 1. To communicate in the north direction, set DIR_SEL = 0.

    Best,

         Quentin