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Original question:

BQ27427: how to resolve the issue about the soc jurmp from 10% to 1% during discharge process?

BQ27427: how to estimated the initial SOC base on BQ27427--0?

johnny xu
Prodigy 80 points
Part Number: BQ27427


Tool/software:

hi，sir,

       Regarding the Bq27427-0 battery fuel gauge, there are several questions:

  1. After the fuel gauge starts up, how is the initial SOC (State of Charge) estimated? And how is the accuracy of this estimation ensured?
  2. What is the difference between the shutdown mode and sleep mode?
  3. During the startup process, which mode (shutdown or sleep) provides better accuracy for estimating the initial SOC?

        thanks。

  • 0
    TI__Mastermind 31020 points

    Hello Johnny,

    Your question has been assigned and a response is being worked on.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    TI__Mastermind 37981 points

    Hello Johnny,

    1. Initial SOC is based on a few conditions but mostly based on the battery voltage at power up.

    2. Sleep mode the gauge is taking ADC readings periodically. In shutdown the gauge is not operating. The LDO output is turned off so power to the chip is lost.

    3. The gauge is not calculating SOC in shutdown mode.

    Regards,

    Adrian

  • 0 in reply to Adrian
    Prodigy 80 points

    hi，Adrian，

         1、How to ensure the accuracy of SOC (State of Charge) calculation during startup, after the gauge is start up again from shutdown mode.

         2、based on which conditions , the  gauge initial SOC？

         thanks

       

  • 0 in reply to johnny xu
    TI__Mastermind 37981 points

    Hello Johnny,

    To ensure the gauge has a good estimate of SOC after shutdown the gauge must be configured properly and the learning cycle needs to be complete. The gauge will give a rough estimate of SOC after shutdown however for the gauge to start tracking SOC accurately the gauge needs another OCV readings, preferable at either complete discharge or full charge.

    Regards,

    Adrian