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BQ24090: Charging NiMH and ISET2 control

Larry Tichauer65
Prodigy 10 points
Part Number: BQ24090

When I look at the bq24090 Data sheet on page 1 I see in the lower right hand corner of the block diagram a block labeled Host. Since I am charging a NiMH battery I believe that I should be able to hardwire the ISET2 pin and not require any external controller for the bq24090 for my application of charging 3 series 1500 mAHr cells.

Please clarify.

Thanks,

Larry

  • 0
    TI__Guru* 75906 points

    Hi Larry

    The ISET2 pin is used to limit input current to the charger.  This feature is useful for USB source with 100mA /500mA applications.  If this is not a requirement for your application then input current limit can be set to fast charge current set by ISET. 

    If only one setting is required the pin can be hard wired to the desired setting.

    LOW = Fast Charge Current, ISET

    HIGH = 500mA

    FLOAT = 100mA