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BQ27520-G4: Power management forum

Part Number: BQ27520-G4
Other Parts Discussed in Thread: BQ27520EVM

Hello friends.

I have a project that uses measuring ICs.
before, I used the bq27542 IC in the package. I can rewrite a new capacity design.

Now, I use bq27520-g4 in the system but I can't rewrite the new capacity design. I cannot access SEALED mode.

can anyone help me how to write a new power design for IC BQ27520-G4, please!

special thanks!

  • Hello,

    The bq27520-G4 has similar interface and configuration as bq27542. You will follow the same steps.

    Refer the TRM here for details

  • HI Shirish!

    Thanks for your support?

    Now, I can write data to flash of BQ27520-G4.
    but I have a new problem.

    The capacity of my battery is 1500mAh. when I write a new DesignCapacity =1500 mAh. after I re-read  DesignCapacity() it is ok. but when I read

    FullAvailableCapacity() register, the value of this register does not change (~1000mAh).
    Please tell How to change the value FullAvailableCapacity() same as the DesignCapacity.

    I use a BQ27520EVM KIT and STM32 connect over the I2C interface.


  • Hello Dai,

    FullAvailableCapacity() is read only. It will be updated by the gauge automatically during operation.