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why does BQ24032 use AC and USB pin to charge battery?

stones yang
Expert 1080 points

Hi,everyone

      BQ24032 has AC and USB pins for selecting different power source.what's the difference between using AC and USB to charge battery?If USB interface is connected to AC pin,what will happen?

Thanks in advance.

Regards,

Stones 

  • 0
    TI__Mastermind 31120 points

    Please read the data sheet.....The USB input is programmed to act like a USB input and the AC input can be programmed to act like an adaptor input or USB input as defined by the PSEL pin.  A USB source typically has less power available.

    Read the USB 2.0 or 3.0 specification and the data sheet to know more details.

  • 0 in reply to Charles Mauney
    Expert 1080 points

    Hi,Charles

             Thanks for you reply.I have read the datasheet before.Actually,I want to know what is the difference about the circuit in the chip between the AC and USB?If system load need more than  500mA while USB is selected as power source,will the chip cut off the current  so as to protect the USB in PC?

    Regards,

    Stones

  • 0 in reply to stones yang
    TI__Mastermind 31120 points

    The input control loops are independent of the output load (OUT and BAT) and if set to USB500mA, that is the maximum current the input control loop will allow.