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BQ24250C: BQ24250C

Part Number: BQ24250C
Other Parts Discussed in Thread: BQ27532-G1, BQ24250


We are using BQ24250C and BQ27532-G1 in our product.

We use Li-ion Battery of 8000mA (4 parallel batteries).

We charge the battery and it get to full charge and then the input current goes down slowly to 0mA.

We start using our product and consume power from battery for few hours. we can charge if we connect external charger and everything looks fine.

After long time, few hours, when we try charging again, the charger is detected by the IC but the charging doen't start.

Only removing the battery helps or depliting the battery to the minimum only then, we can start charging the battery.

We diasble charging timer of 6 hours but still same problem.

I attached the schematic design.

Best regards,

SImoni Yossi.02. Battery Pack.pdf

  • Hey Yossi,

    From your schematic, it appears you have both the host and the gauge connected to the I2C lines of the bq24250. Which device is controlling the charger?

    Edit: One additional question is what your setting is for 'FC Clear %' and 'FC Clear Volt' are in the Data Flash configuration for the bq27532? 

    Joel H

  • Hi Joel,

    The MCU communication is through BQ27532-G1.

    R303 and R304 are connected to MCU.

    R209 and R211 connect BQ27532-G1 to BQ24250C.

    R210 and R223 are not connected and they are as an option.

    FC Clear % parameter is -1

    FC Clear Volt is 3900mV.

    I face another problem that I can read register data.

    they are ICs that I can but most of them I can't read the data.

    I receive an error message as can be seen in the attache screen capture at the lower left side

    Best regards,

    Simoni Yossi.

  • Hey Simoni,

    One other question I have is the voltage of the battery (as seen my the gauge) when you attempt to charge again? 

    It needs to be below the 3900mV you told me, in order to recharge the battery.

    As far as the data flash read fail, try following this e2e post recommendation to see if that helps.


    Joel H