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Original question:

BQ25628: Problem with charging

BQ25628: How to know the Full charge status of the battery and the % battery charged

Anushka Palawat
Prodigy 160 points
Part Number: BQ25628
Other Parts Discussed in Thread: BQ27Z561-R2

We want to know the % battery charged and if the battery is fully charged stauts registors. We are programming it to our Nordic BLE SoC.

Alternatively if any excel or (setup tool exe) is available to setup the registers, will be of great help. 

  • 0
    TI__Guru** 105760 points

    Hello Anushka,

    In order to get accurate state of charge I would recommend implementing a dedicated battery gauge like the BQ27z561-R2. What are your gauging requirements?

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 160 points

    Hi,

    We already have the device ready with us so it will not be possible to implement the changes. 

    We just want to set a few parameters - Indication of USB connection and charging start to start LED indication, which we are getting
    Indication of Full charge so that LED indicator works and the user disconnects the Charger - need to implement
    Indication of Battery status on the mobile app - need to be done.

  • +1 in reply to Anushka Palawat
    TI__Guru** 105760 points

    Hello Anushka,

    The battery charger will not be able to provide a % state of charge, this will either need to be calculated by the host using ADC values, or implementing a battery gauge in the design.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 160 points

    Thanks. What about full charge indication. Is there any way to know the battery is fully charged?

    And where to get the ADC values from in the circuit sent by us?

  • +1 in reply to Anushka Palawat
    TI__Guru** 105760 points

    Hello Anushka,

    It will be difficult to get reliable SOC % using only a charger's ADC readings and the host, this is not recommended unless very high error is acceptable for the application, for example 4 LEDs so 25% error is acceptable.

    You would need to use the chargers STAT pin in order to determine if charge is complete. The ADC registers for different voltages and currents are defined in the datasheet of the charger. You will need to use your host and pull the data to do your estimations for SOC.

    Sincerely,

    Wyatt Keller