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BQ24070: bq24070 how to enable use software

Lina Wang
Intellectual 960 points
Part Number: BQ24070

hi  

BQ24070 haven't hardware enable pin, do you have idea how to enable charge use software.

we need control charge, because we don't want to battery at full capacity at all times.

  • 0
    Intellectual 960 points
    add another question,
    spec is said "After charge termination, the bq2407x re-starts the charge once the voltage on the BAT pin falls below the V(RCH)
    threshold. This feature keeps the battery at full capacity at all times."
    whether this feature will effect battery life, because it is always charge to full capacity.
    thanks.
  • 0 in reply to Lina Wang
    TI__Mastermind 21590 points

    Hello Lina,

    You can make use of the CE pin on the bq24070. The pin is active high so when the pin is pulled low, the Input FET is turned off and charging stops. OUT will still be powered by the battery. A voltage divider can be used to feed the voltage to the MCU which can pull CE low when the battery voltage goes above 4.1V. Regarding your second question, this wont affect battery life because a full cycle ins't completed. The device just makes sure that the battery voltage is always above a certain level when VIN is present.

    Regards,

    Raheem

  • 0 in reply to Raheem
    Intellectual 960 points

     Raheem,

     if we use CE pin, It will take another question which is Vin also will be turn off (Q1 fet is turn off) when CE pin pull low, in fact, customer hope if only Vin exist, that Vin always provide system power, while battery voltage up to 4.1V, and then to stop charge, but Vin still can provide system power, so it seems CE pin can't achvie it, do you have other way? thanks.

  • 0 in reply to Lina Wang
    TI__Mastermind 21590 points
    Lina,
    You can use the TS pin. When the voltage on TS is outside VHOT or VCOLD, the device suspends charging. You can use the MCU to control a FET which pulls the pin to ground when the BAT voltage is at or above 4.1V.
    Regards,
    Raheem