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BQ25606: No Battery Connected

laurence steele
Prodigy 80 points
Part Number: BQ25606

Hi,

I'm trying to understand what the device does when no battery is connected to the IC.

Does the IC detect for no battery and if so, what happens when this is the case?

Cheers, Laurence Steele

  • 0
    TI__Mastermind 25800 points

    Hey Laurence,

    The bq25606 does not perform battery detection. If no battery is present, and charging is enabled, the VSYS voltage will move between VSYSMIN + 150mV and VBATREG + 150mV, in a pseudo-charging cycle that is performed on any parasitic capacitance on VBAT. 

    However, if charge is disabled, the VSYS voltage will remain at VSYSMIN+150mV.

    Regards,

    Joel H

  • 0 in reply to Joel Hernandez II
    Prodigy 80 points

    Hi Joel,

    How would the device respond if a battery is being charged and reaches for example 80% charge capacity and then I remove this battery and replace immediately with another battery at 30% charge.

    Would the device know the battery has been changed and needs to restart the charging cycle / timer or would I need to power cycle the device?

    Cheers, Laurence

  • 0 in reply to laurence steele
    TI__Mastermind 25800 points

    Hey laurence,

    Whatever the capacity of the battery, our charging profile operates in three main regions. The first is Pre-charge. The second is the Constant Current (CC) region. The third is the Constant Voltage (CV) region. Each of these regions are determined solely on the battery voltage on the BAT pin. We have various rising/falling thresholds listed in the EC table to trigger these region changes. 

    Now to your question, depending on the voltage between the 30% and 80% battery (for example), the charger will first likely terminate immediately (this is due to the no battery present condition, where we continue to charge any parasitic capacitance and the 10uF cap on the BAT pin; it looks like mini charge cycles over and over). Then when a different battery is plugged in, the charge cycle will begin anew (assuming the switch between batteries was slow enough) and the charger will dump current into this battery depending on the region it detects the voltage at.

    So you would not need to POR, given again that the switch between batteries is not incredibly fast.

    Regards,

    Joel H