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BQ27750: Battery Management Studio not detecting BQ27750

Rich templeton
Prodigy 100 points

Part Number: BQ27750

Hi,

I have designed a board with a BQ27750 on it. I have a EV2400 connected the board through I2C. I am using BQSTUDIO v1.3.86.6. I am trying to use the 1750_0_05-BQ27750.bqz as the target but when I do I am getting the below error. Also when I click ok, it reads the devices temperature as incorrect so I dont know if is actually reading anything correct. Do you have any suggestions on how to fix the issues that I am having? I have read to use a different version of BQSTUDIO V1.3.80 Build 1 but I cannot find the download for this. Thanks for your help in advance.

-Rich

  • 0
    TI__Guru 52115 points

    The auto-detected device doesn't seem correct.  Make sure you only connect to the bq27750 device.

    Use the 1750_0_05-BQ27750.bqz as the target and go to the Programming tab.  Program the device with v0.05 FW below and try again to see if the device can be auto detected by bqStudio.https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/7120.bq27750_5F00_v0_5F00_05_5F00_build_5F00_13.srec

  • 0 in reply to Andy Liu (BMS)
    Prodigy 100 points

    Hi Andy,

    On my board I cannot only connect to the BQ27750, I am connecting to an I2C bus with 5 devices on it. When I program the device with the v0.05 FW I am still not able to automatically recognize the BQ27750. I am not able to use the FW_VERSION command to read the FW number. I an not able to read the Device_Number either. I can read the HW_NUMBER but every time I read it I get a different result. Do you have a problem where the size of everything is so small you cannot read it or make it larger? how do you fix this?

  • 0 in reply to Rich templeton
    TI__Guru 52115 points

    I would suggest you find a way to communicate with the BQ27750 device only and make sure the bqStudio can talk to it.

    Andy

  • 0 in reply to Andy Liu (BMS)
    Prodigy 100 points

    Hi Andy,

    I was able to get the BQstudio to automatically recognize the BQ27750 by isolating the I2C bus to only be this device. Does this device need to be on its own I2C bus to function properly? What is the quickest way to bring up a battery pack with the BQ27750? I am using section 8.2.2 of the datasheet but is there a simpler way on the BQstudio?

  • 0 in reply to Rich templeton
    TI__Guru 52115 points

    No,  I would suggest check other i2c devices on the same bus and make sure no other device share the same i2c address as the bq27750.

    The quickest way to bring up a battery pack with the BQ27750 is to use a bq27750 EVM and bqStudio.  You can follow the 

    Section 8.2.2 of the datasheet. Note that you need the first program a proper chemistry id to it and also run a learning cycle.

    And