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Original question:

BQ25895M: BQ25895M DSEL D+ D- pin configuration.

BQ25895M: CP2102N-A02-GQFN28 or other MCUs with USB (USB-UART Bridge) in parallel to Charger D+ and D- lines

Florian Homilius
Prodigy 10 points
Part Number: BQ25895M

Hello,

I have a project where I need a USB-UART Bridge (CP2102N-A02-GQFN28) to program and communicate with the MCU over USB. In a second project I use a  MCU (ESP32-S3) with integrated USB functionality. In both cases I want the BQ25895M, but I am pretty sure that the USB datalines of the two devices cannot be mereged that easily. Can please someone explain how to do that :-) 

Best regards from Germany!

  • 0
    TI__Mastermind 23655 points

    Hello Florian, 

    Thank you for reaching out via E2E. The D+/D- lines are used for USB input type detection when VBUS is plugged in. During the charger input detection process the host must be able to HiZ D+/D- so that D+/D- can be driven by the charger. Depending on if HVDCP detection is enabled or not the max time input detection will take is approx. 2 sec. 

    The charger will return the D+/D- pins to HiZ after VBUS comes up and the datelines can be used for other purposes. 

    Regards,

    Garrett