• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 63 subscribers
  • Views 105 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

BQ25710: Maximum input current limit

BQ25710: Charger behavior in full charge

Gil Hershman71
Intellectual 580 points
Part Number: BQ25710

Tool/software:

hello,

According to recent support from you (https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1495790/bq25710-maximum-input-current-limit):

The BQ25710 requires the user to terminate the charge operation (I assume when it reaches 100%).

Are there options (registers) to define what the charger does when the battery is full?

From our experience with the BQ25710, when it reaches 100%, charging stops and discharge starts, although DC_IN, VBUS pin, is still connected to external DC input.

Charging starts again when the battery reaches ~95%.

Is it configurable?

thanks,

Gil

  • 0
    TI__Mastermind 33205 points

    Hi, Gil,

    Unfortunately, there is no register bit for battery termination function. You can set the charge current to zero when the battery is full. 

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Intellectual 580 points

    Thank you Tiger.

    Can the behavior of our charger be explained?

    From what we experience with the BQ25710, when it reaches 100%, charging stops and discharge starts, although DC_IN, VBUS pin, is still connected to external DC input.

    Charging starts again when the battery reaches ~95%.

  • 0 in reply to Gil Hershman71
    TI__Mastermind 33205 points

    Hi, Gil,

    It looks normal behavior. I did not get what is the complaint. 

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Intellectual 580 points

    Hi Tiger,

    It seems the charging stops automatically at 100%, without me writing to any charger register (for example 0x14) and then resumes aitomatically at around 95%, again, without any write to any charger register.

    All that while the charger is connected to external DC source.

    Is that a normal behavior?

    Can that behavior be programmed/defined differently?

    I mean, for example, resume automatic charging at 90% (and not at 95% as we see now).

  • +1 in reply to Gil Hershman71
    TI__Mastermind 33205 points

    Hi, Gil,

    That is normal. The charger stops charging automatically when the battery voltage reaches the charge voltage() target. It also recharges automatically when the battery voltage drops below 95%. 

    Unfortunately, the recharge level is not programmable by register. 

    However, if you set the charge current to zero, the charger won't recharge even if battery voltage drops below 95%. It waits for recharge command from the user. 

    You have full control by using an external host controller. 

    Regards,

    Tiger