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bq27541v200 - writing golden DFI file into battery packs

zSz
Prodigy 75 points
Other Parts Discussed in Thread: BQ27541-V200, BQ27541-G1

Hi,

We have a project  for a Lithium Polymer battery having a bq27541v200

I have generated a golden  DFI file using EV2300 / BQ Easy / bq275xx software and will provide this to the PCB manufacturer for programming during mass production in the future.

However, I need to build approximately  20 battery packs urgently for customer evaluation/testing but not sure how to copy this golden DFI file into the other battery packs.

Updating and copying GG files is not a problem and can be done using the EV2300. Can I use the EV2300 to do this also and then follow by updating the GG file? This is rather urgent and any assistance would be greatly appreciated.

Thanks in advance.

ZS

  • 0
    TI__Genius 14985 points

    Hi ZS,

    You can jump to bqEASY step 1B and browse for your golden DFI file then Program it into all of the packs.

    If you used a bq27541EVM for creating the golden file then you calibration data might be slightly different that what is needed for the packs.  You could try to calibrate a pack or two after you program it.  Just be sure to do the current calibration last since it will cause the battery voltage to droop and then slowly relax back to resting voltage.  You don't want the voltage to be changing while you try to calibrate voltage.

    Also, the EV2300 doesn't have pullups on the I2C port.  The bq27541EVM does have pullups but your pack probably doesn't.  Therefore you will probably need to add external pullups to talk to your packs.  Alternatively, you could open up the EV2300 and solder some 10k resistors between the SDA/SCL pins and the HDQ VOUT pin to make some permanent pullups.

  • 0 in reply to dMax
    Prodigy 75 points

    That worked fine.

    In order to finalise the pack for the customer to begin using, I need to enable the IT using the EV2300. Can you tell me exactly where and what to enter in order to do this?

    This is the bq27541v200

    Thanks

  • 0 in reply to zSz
    TI__Genius 14985 points

    To enable IT, you send the IT_ENABLE subcommand (0x0021). 

    You can use the I2C Pro screen to write data 2100 starting at address 00.

    Or you can use the DataRAM screen.  You should click on the number next to the Control register, type in 0021, hit the Enter key to send the command. 

    To confirm IT has been enabled, Refresh on the DataRAM screen and you should see the QEN bit is set (red) in the CONTROL_STATUS register.

    We also recommend that you put the gauge in the SEALED state by sending the SEAL subcommand.  This is command 0x0020 and you use the same procedure if using EVSW.

    We also have a new tool called GaugeStudio that you can try instead of EVSW for new products.  It is also compatible with bq27541-V200, but you can download it from the bq27541-G1 product folder on ti.com.  To send these commands you just click a button which is much easier.

  • 0 in reply to dMax
    Prodigy 75 points

    Hello,

    I managed to find out in the end and used the DataRAM screen to enable IT and seal the packs. The Control Status register confirmed this by setting the QEN bit.

    It will be interesting to try out the GaugeStudio tool, which I will be test with this week.

    Thanks