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BQ25895: BC1.2 detection switch and charging solution

user5072757
Prodigy 30 points
Part Number: BQ25895
Other Parts Discussed in Thread: BQ24392

Hi,

I think I must be missing something obvious, but someone please point me in the right direction.

I'm looking into a solution to charge the battery via USB port. I'd like to maintain the USB D+/D- connected to my host MCU when it's plugged into SDP or CDP, and full speed when it's connected to a DCP. The solution I can think of is using something like BQ24392 + battery charger. I'm wondering if there exists a single chip solution that includes a USB data switch and a battery charger. I found many chargers that do BC1.2 but don't have the USB switch. Do I miss anything here?

Thanks!

  • +1
    TI__Guru 59341 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. Please refer to the EVM User’s guide at https://www.ti.com/lit/ug/sluuba2b/sluuba2b.pdf for sample circuitry.

    Thanks,

    Ning.