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BQ24195: Recharge threshold value

Mohit Agarwal
Prodigy 20 points
Part Number: BQ24195

What is the recharge threshold value ? What is the voltage value below which when the cell goes the bms starts charging automatically?

  • 0
    TI__Mastermind 24075 points

    Hi Mohit,

       This depends on REG04[0] bit 0. If 

    • REG04[0] = 0 then recharge threshold is set to 100mV below battery regulation voltage. This is default value.
    • REG04[0] = 1 then recharge threshold is set to 300mV below battery regulation voltage

    Battery regulation voltage is set by REG04[7..2]

  • 0 in reply to Kedar Manishankar
    Prodigy 20 points

    in automatic mode what is the voltage under which when battery goes the bms starts charging it?

    REG04[7..2] has default value of 4.2V . According to it , the battery will start charging when its voltage drops 100mV under 4.2V??

    I am confused in this part

  • 0 in reply to Mohit Agarwal
    TI__Mastermind 24075 points

    Hi Mohit,

       When adapter and battery are present, the device initiates and complete a charging cycle without software control. It automatically detects the battery voltage and charges the battery in three phases: pre-conditioning, constant current and constant voltage. At the end of the charging cycle, the charger automatically terminates when the charge current is below a preset limit in the constant voltage phase.

    If adapter is still connected and battery voltage falls below 100mV or 300mV of set charge regulation voltage (depending on status of REG04[0]) it is desirable to have a battery fully charged while adapter is present. So while adapter is present, if battery voltage falls below the REG04[7..2] - 100mV/300mV thresholds then the IC will initiate charge again. The 100mV or 300mV falling threshold depends on what setting you have in REG04[7..2]. 4.2V is default.