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bq27500 Gas Gauging - some questions

Julian E.
Prodigy 140 points
Other Parts Discussed in Thread: BQ27500, BQ27500-V130, BQ27510-G3

Hi there,

I've been unsuccessfully trying to calibrate a battery for a few days now. I am using the bq27500 in my own design and I2C communication is working fine. For calibrating the battery, I am using EV2300. Regarding that, I have a few questions:

1) On my first device, the Impedance Track Configuration Wizard in bqEasy got stuck on "1B. Load .DFI-File". While is was loading the DFI-file to the bq27500, it made a break and didn't continue. Since then, the bq27500 on my device isn't accessible any more, neither with I2C on my host software, nor by the EV2300 using bqEasy. Is there any way to reset the bq27500 to make it work again?

2) On the second device, everything works fine when using the Impedance Track Configuration Wizard. For calibrating the battery, I discharged it to empty and waited for 5 hours. After that, I clicked the "Initialize Impedance Track Algorithm". The IT Enable turned to 1, which is fine, but the VOK and QEN bits stayed 0. This means Impedance Track won't work, right?

I made some screenshots of my configuration. These were taken after I initialized the Impedance Track Algorithm.

Could you please tell me, if there is anything wrong about it?

Thanks in advance for your help!

Regards,

Julian

  • 0
    TI__Genius 14985 points

    Hi Julian,


    Your bq27500EVM probably came pre-loaded with the older FW version but could be upgraded to the latest FW version of bq27500-V130 using the SENC file from here:

    http://www.ti.com/product/BQ27500-V130/toolssoftware

    Can you send a screenshot of your entire EVSW screen, please?

    Your Control Status register is showing all zeros which is not very common so something might be wrong.  A screenshot showing the title bar and the bottom bar might give us some clues.

    I might also recommend that you look at the bq27510-G3 instead of bq27500.  It has an integrated LDO and has been updated much more recently than bq27500, which will probably never get an update again.

  • 0 in reply to dMax
    Prodigy 140 points

    Here is a screenshot of my EVSW screen:

    I'll try to upgrade it to FW Version 1.30 now.

    Edit: my EVSW version is 0.9.92.

  • 0 in reply to Julian E.
    TI__Genius 14985 points

    Hi Julian,


    Indeed your screenshot is showing v1.08 which is the original bq27500 FW.  Please follow the instructions in SLUA453A to upgrade your EVM to bq27500-V130.

  • 0 in reply to dMax
    Prodigy 140 points

    I did upgrade it to v1.30 now, but Control Status remains the same - all zero.

  • 0 in reply to Julian E.
    TI__Genius 14985 points

    Can you please post a screenshot showing the DataRAM window right after power-up of your EVM?

    Do you mean sending IT_ENABLE still doesn't set QEN?  What about the IT Enable parameter in DataFlash?  Does it get changed to 1 after you send IT_ENABLE?

  • 0 in reply to dMax
    Prodigy 140 points

    Hi dMax,

    >> Can you please post a screenshot showing the DataRAM window right after power-up of your EVM? 

    here's a screenshot of the DataRAM window. It's not taken right after power-up, but it didn't change since then. In the screenshot, I'm doing the first discharge in the cycle learning process (Step 5 in bqEASY). By the way: I am not using the bq27500-EVM, it's on my own hardware and communication to my host processor via I2C is working fine.

    >> Do you mean sending IT_ENABLE still doesn't set QEN?  What about the IT Enable parameter in DataFlash?  Does it get changed to 1 after you send IT_ENABLE?

    After sending IT_ENABLE, neither QEN nor VOK get set. The IT Enable parameter in DataFlash gets set successfully when sending IT_ENABLE.

  • 0 in reply to Julian E.
    Prodigy 140 points

    I finally could solve the problem.

    The gauge did not detect a battery insertion, because I didn't use an external temperature sensor in the BI/TS network. I now connected TS with a 10k resistor to ground and a battery is detected. After sending IT_ENABLE VOK and QEN are set correctly.

    This thread helped me to solve the problem: 

    http://e2e.ti.com/support/power_management/battery_management/f/180/t/72366.aspx