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BQ27441-G1: Some question about SoC%

chentsu chung
Mastermind 6180 points
Part Number: BQ27441-G1

Hi,

Here are some question about BQ27441:

1. After I2C initial BQ27411, can read SoC while USB charging; but can't read SoC after USB disconnected.

2. Why I have to initial BQ27441 then can read SoC everytime.

3. the SoC% are different when "USB charging then initial" and "USB disconnect then initial", they should be the same?

Thank you very much.

C.T.

  • 0
    TI__Guru* 76230 points
    Hi Chentsu
    I am not sure i understand your question. Are you saying you are unable to read values from the gauge when you do not have the USB connected for charging? Does the 3.3V that the comm lines is pulled to have the same ground as the rest of the circuit. Ensure that is the case. Also, captuer scope shots of the comm lines so we see what is going on
    thanks
    Onx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 10 points
    Hi Onyx
    I used MSP432 SDK example with C:\ti\simplelink_msp432p4_sdk_2_20_00_12\examples\nortos\MSP_EXP432P401R\demos\boostxl_batpakmkii_fuelgauge

    But I have find two question to used this example,
    1. Plugin USB charge battery is proper work which read capacity increased from gauge, but unplug USB could not read decrease battery capacity from gauge. I must repeat to call initial function "BQ27441_initConfig(), BQ27441_initOpConfig(), BQ27441_control()" that will proper work.
    2. When USB plugin and unplug, I read battery capacity have a gap from gauge, immediately. (ex. plugin 40%, unplug 55%)

    What is the correct flow to use boostxl_batpakmkii_fuelgauge example code ?

    Thank you very much.

    Morris
  • 0 in reply to Morris Hung
    TI__Guru* 76230 points
    Hi Morris,
    I am not a software expert so there is little help i can provide heree. Have you taken a lo ok at the app note bllw?
    www.ti.com/.../getliterature.tsp
    thanks
    Onyx