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BQ25611D: Co-operating with USB device (MCU)

Jan Thoegersen
Prodigy 10 points
Part Number: BQ25611D

HI,

I'm designing a portable device with a 1S lithium polymer battery. I'm going to use a USB port as charging source however the same usb port will be shared with the onboard MCU. Is that possible with the BQ25611D? Can it co-operate on the D+ & D- with the MCU without interfering?

Connected to a computer the MCU should be able to communicate via the USB as a normal device. When the circuit is connected to a USB charger the BQ25611D should detect the capabilities of the charger.

Possible?  

  • 0
    TI__Guru 57341 points

    Hi,

    D+/D- pins are used for USB input current limit detection when VBUS power is plugged in. During the charger input current limit detection process, the host must be able to HIZ D+/D- pins so that D+/D- pins are driven by the charger. If the host is unable to HIZ D+/D- pins, a USB switch is needed to isolate the host and the charger.

    Thanks,

    Ning.