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BQ27750EVM-837: device not recognized automatically and Battery Management Studio does not accept 1750_0_04-bq27750.bqz file

Anja Ulrich
Prodigy 110 points
Part Number: BQ27750EVM-837
Other Parts Discussed in Thread: EV2400, BQSTUDIO

Dear TI-Team

I have some problems and questions concerning the BQ27750EVM-837 with the EV2400.

1. I couldn't find the bqz file in the target selection wizard therefore I took the 1750_0_04-bq27750.bqz file I found in another question on the forum but now I get the error message: "The detected device is not compatible with this application." I put the file into: C:\ti\BatteryManagementStudio\config.
During the installation I also didn't get the messages described in step 2/3 of the  2.2 Software Installation in the manual. (TI USB DRIVER INSTALLER etc.).
Do you have an idea why it's not working? Are there any other drivers also for the EV2400 or some hardware configuration which need to be done for the EV2400 beforehand on the board?

2. The auto detection of the device also doesn't work somehow even though I applied a voltage at the charger/load pins TP6 & TP2 and pressed the pushbuttion S1. Does the device work without battery connected or does the battery needs to be connected to start the device?

3. What are the min, max voltages which can be applied at the charger/load input?

I hope you can help me!

Kind regards

Anja

  • 0
    TI__Genius 10370 points
    Anja,

    1) There is a tool that will update the firmware of the EV2400 on TI.com located here http://www.ti.com/tool/EV2400. Please try and double click the EV2400 updater while a gauge is not connected. If it is successful we can rule out the EV2400 is bad

    2) Technically you can apply voltage to just the pack pins. I would highly recommend applying voltage to the bat pin and follow the procedure listed below.

    3) For the bq27750 I would only apply the battery max voltage to the pack pins to protect the battery itself.

    For simple debug i would start like this
    1) Apply a voltage to the bat pins somewhere between(3V-4V)
    2) Connect the EV2400. The EV2400 does have I2C pull-ups built in, please remove any on EVM pullup jumpers that might be present
    3) Short bat+ to pack+ for just a moment to wake the device from shutdown
    4) Open bqstudio. If it does not auto detect please open the bq27750 bqz file you copied to the config folder and navigate to the advanced comm screen. Please try and read "Start address" = 0x0D at both address 0xAA and 0x16 to find which is successful.

    Look forward to hearing from you on the results
    Thanks,
    Eric Vos
  • 0 in reply to Vos
    Prodigy 110 points
    Hey Eric
    Thanks a lot for your answer.
    What I did:
    I downloaded the update firmware tool of the EV2400 and installed it successfully, the firmware is now on v0.18. Also a sound appears when pluggin gin the EV2400 though I can't find the device.
    I removed the SDA (JP3), SCL(JP4) and TS (JP1) jumpers so that no jumpers are left on the board. Then I connected the 4V source to the TP1 (1P)and TP5 (1N) pins of the battery as you said. Then i shorted the charger+ terminal and the 1P terminal of the terminal block for one second with a jumper calbe and then started the software but the device still wasn't detected.
    Also the selecting of the bq27750 file in the target selection wizard still doesn't work.
    The only thing i didn't try and understand was your last point with opening the bq27750 file and navigating to the advanced comm screen as I can't open the bq27750.bqz file. Do you mean the the advanced adress scanning option in the selection wizard?
    Do you have some other ideas?
    KInd regards
    Anja
  • 0 in reply to Vos
    Prodigy 110 points
    Hey Eric thanks a lot for your help I found the mistake! the I2C cable to the EV2400 was damaged. That I didn't check that earlier!
  • 0 in reply to Anja Ulrich
    TI__Genius 10370 points
    Anja,

    So at this point you are up and running? If you run into more issues please let me know.

    Thanks,
    Eric Vos
  • 0 in reply to Vos
    Prodigy 110 points
    Hey Eric
    Actually I posted another question to the forum concerning the device but a slightly different topic:
    e2e.ti.com/.../692351
    Maybe you could look at it too?
    Thanks a lot!
    Kind regards
    Anja