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BQ40Z50-R1: Communication can not be performed normally. bqStudio does not recognize

user1590158
Prodigy 80 points
Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: BQSTUDIO, EV2400

I use RL78-MCU to communicate with the PCB board on which BQ40Z50-R1 is mounted, but some boards always return incorrect data.

Even if bqStudio is started, "Target Selection Wizard" is displayed on board which returns incorrect data and it is not recognized automatically.If you try with a normal board, the BQ40Z50-R1 will be recognized automatically.

The cell is not connected and voltage is applied to the PACK terminal side.

We know that it is possible to communicate properly by replacing the BQ40Z50-R1, so we suspect a device failure.

I upload communication contents when bqStudio starts up.

Do you know the cause?

Thanks.

normal

Bus Definition: I2C          
Time Repeat Start Direction Address Data Missing Ack
1.39E-17 Write 16 22 3E X
2.60E-02 Write 16 20 3E X
5.10E-02 Write 16 22 3E X
1.83E-01 Write 16 2F
1.84E-01 X Read 17 0B 45 00 01 06 00 24 00 03 85 02 00 D0

error

Bus Definition: I2C          
Time Repeat Start Direction Address Data Missing Ack
1.39E-17 Write 16 22 3E 00 00 X
2.60E-02 Write 16 20 3E X
5.20E-02 Write 16 22 3E 00 00 X
1.74E-01 Write 16 2F X
1.84E-01 Write 16 00 01 00 06
2.05E-01 Write 16 0
2.06E-01 X Read 17 17 17 17
2.14E-01 Write 16 00 02 00 39
2.36E-01 Write 16 0
2.37E-01 X Read 17 17 17 17
2.45E-01 Write 16 00 00 00 13
  • 0
    TI__Expert 4645 points
    Hi,
    It seems that you the device is not being seen.

    If you manually choose the bq40z50-R1 from the list in bqStudio are you able to communicate with the device?

    Do you have 4500_0_12-bq40z50.bqz, and 4500_1_06-bq40z50R1.bqz in your C:\ti\BatteryManagementStudio\config directory?

    Please also provide which version of bqStudio you are using.

    Thanks.
  • 0 in reply to Steve Schnier
    Prodigy 80 points
    Hi Steve Schnier,
    Thank you for your reply.

    It does not recognize it manually, and there are also two in the directory.
    Version is 1.3.52.

    Is there anything to be found out from the communication contents?
    Is there anything else to check?

    Thanks.
  • 0 in reply to user1590158
    TI__Expert 4645 points
    Have you visually inspected the SDA and SCL lines on a scope to see if the signal is good? Do you have an adequate pull-up on the lines?

    I am uncleare when the communication works, and when it does not. Does communication always work with the bqStudio + EV2400 + bq40z50-R1 EVM? Do you only have issues when you are using your own processor and board?
  • 0 in reply to Steve Schnier
    Prodigy 80 points
    Hi Steve Schnier,

    There is no problem with the waveform of SDA and SCL by checking with the oscilloscope, but I doubt the connection with the communication board.
    Thank you for your support.

    Regards,