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BQ24725A: About some key points of this chip

MINMIN ZHU
Prodigy 30 points
Part Number: BQ24725A
Other Parts Discussed in Thread: BQ40Z50-R2,

we are using this chip as charge management, these questions need to be clear, please help:

1. how to know the charging status, looks like there is no such registers can indicate the charging status, charging or not or completed.

2. do we need to set different charging currents during each charging cycle, or we just set the maximum charging current, because as far as I know, there are many different charge ways like PULSE, CC, CV, especially at the end of the charging, the charge current is reduced linearly. 

3. how to get the battery capacity percentage while charging, the voltage of the battery is usually higher than real while charging in a large current.

  • 0
    Prodigy 110 points

    Dear Minmin Zhu,

    2) If you are using Li-ion/LiPo charging is performed in  CC/CV mode. Take numbers for current and voltage from cells manufacturer datasheet.

    3) This is solved by TI battery gauges. For example, in our system we are using bq40z50-r2. This chip is connected through smbus and in general is capable to send control messages to the bq24725A charger.

    Thank you

    Andrei

  • 0
    TI__Genius 11850 points
    Hi Minmin,

    1) Section 8.4.5 of the datasheet lists all of the conditions that must be valid to start charging as well as a list of conditions that will stop charging. You're correct that the BQ24725A doesn’t have a dedicated charge status register to allow the user to easily read out the charge status. A possible workaround is to use the IOUT pin to monitor the charge current, but if you would rather read the charge status through software, a different charger IC with more registers and software flexibility would be more suitable. If you give me a list of your specs and requirements, I can help suggest some alternative parts.

    2) You only need to set the maximum charging current.

    3) As Andrei mentioned, please look into a gauge for this:
    www.ti.com/.../overview.html

    Best regards,
    Angelo