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BQ24707: The feature of IOUT pin in BQ24707

ngo nhi
Prodigy 10 points
Part Number: BQ24707

Hello everyone

I am wondering about the IOUT pin of BQ24707. Can we use it to calculate the reality charge current output to the battery ?

Thanks for your support ! 

  • 0
    TI__Genius 11850 points
    Hi Ngo,

    Yes, it is possible to use the voltage on the IOUT pin to calculate the charge current. There are 2 cases for IOUT, depending on the value of register 0x12H bit[5]:

    1) If bit[5] = 0, then IOUT is sensing the adapter current, and the equation is Viout = 20(Vacp - Vacn)
    2) If bit[5] = 1, then IOUT is sensing the charge current, and the equation is Viout = 20(Vsrp - Vsrn)

    Therefore, if bit[5] is set to 1, then Viout = 20(Vsrp - Vsrn) = 20(Ichg)(Rsr), and so:

    Ichg = Viout/(20*Rsr)

    With the default Rsr = 10 mΩ value, then Ichg = 5*Viout.

    Best regards,
    Angelo