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Battery Charger BQ24160 or BQ24163

Michael Bauer1
Prodigy 60 points
Other Parts Discussed in Thread: BQ24160, BQ24163

I'm trying to decide which part, BQ24160 or BQ24163 is best for my design.  Vsys(reg) for 24160 = 3.7v, and 24163 = 3.4v.  I'm using a 10AHR single cell li ion battery so nominal voltage = 3.7v and max = 4.2v.

* What does Vsys represent?

* Does it have anything to do with the battery charging?

* Is Vsys basically a switcher output that can run my logic VDC rail direct without a separate LDO?

Second question?

* Is there a way to monitor the battery vdc through the I2C?  I don't see that in the spec sheet? Or at least don't understand how.

  • 0
    TI__Guru*** 146725 points

    Vsys is your system's voltage to run other ICs, like your logic.   It allows you to run your system immediately from power up and, for example, communicate with the charger via I2C.  VMINSYS for the 163 is 3.2V.  Can your system run from 3.2V?

    The charger can't be used to monitor the voltage during charging.  It will, of course, stop charging at the regulation voltage.  You would need a gas gauge like bq275xx for that.

     

     

  • 0 in reply to Jeff F
    Prodigy 60 points

    CD pin is driven low to enable the BQ24163, and high to disable the chip...

    * When CD is driven high, will this also disable the battery charge functions, or does it only disable the SW output?  Battery charger still functional?

    * on my earlier question, can we read the battery vdc from I2C, I'm looking to read this voltage only when the system is active, not during battery charging.  Is a gas gauge still the requirement.  With all the capabilities of this chip, I would think I could sample the battery voltage from I2C 

  • 0 in reply to Michael Bauer1
    TI__Guru*** 146725 points

    CD is short for charge disable.  When CD is high, the IC is in High impedance mode meaning it doesn't output any current for charging or for the system and BAT is tied to SYS through the battery FET.

    The IC cannot provide the battery voltage.  It senses voltage using analog circuitry and does not have an integrated AtoD converter to read back that voltage.  You will need a gas gauge or equivalent circuit in order to know the battery voltage.