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How to Configure EEPROM of BQ27000

Mahesh Hooli
Intellectual 740 points
Other Parts Discussed in Thread: BQ27000, BQ27010

We are using 3.7V /950mAh Li Ion Battery. We are using BQ27000 to monitor the Battery status. This is interfaced to OMAP3 through HDQ interface.

What is the default configuration on EEPROM?

How to configure it to our battery?

 

  • 0
    TI__Genius 14985 points

    Hi Mahesh,

    You will need to review many of the app notes in the bq27000 Product Folder, especially SLUA338 (Configuring the bq27000/200 for Gas Gauge Applications).  You cannot use the default EEPROM values as every battery project is different and you will need to modify all 10 EEPROM values to customize for your system and cell.  You will need to use the datasheet of the battery cells you are using including profile curves, or you can characterize the battery yourself to generate the curves. 

    You might also want to consider the newer, more improved version, bq27010.  This device improves accuracy by compensating for current and temperature during gauging.  SLUA429 explains the basic differences between the two versions.

    Also consider good ESD and RF mitigation during your hardware design.  Refer to SLUA460 for recommendations.

     

    Regards,

    David

     

     

     

     

     

  • 0 in reply to dMax
    Prodigy 10 points

    Hi,

    We have connected HDQ of BQ27000 to MSP430 controller.Is it possible to program fuel gauge thru MSP430?

    Manual saying it needs 21V pulse,EV2300 board..

    We have assembled boards gauge with MSP430.How to program BQ27000 device.

  • 0 in reply to richard ambrose
    TI__Genius 14985 points

    Yes, you will need a 21V pulse to program the EEPROM of the bq27000.  Do you have test points to apply this pulse on your boards?

    If not, you can also update the RAM of the bq27000 to over-ride the default EEPROM values, but you will have to update the RAM every time the IC loses power or the RAM gets corrupted.