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BQ25886: D+/D- and USB line

Yuto Sakai
Mastermind 6100 points
Part Number: BQ25886
Other Parts Discussed in Thread: BQ25890

Hi,

Is it OK to connect D + / D-, Host and USB line directly?
When I looked at the BQ25890EVM, I checked that the MUX is connected.
Is it necessary for BQ25886?

Best regards,
Yuto Sakai

  • 0
    TI__Genius 10385 points

    Yuto,

    The MUX is only necessary if you plan to share the D+/D- line with other devices that will be transferring data. If this is the case, a MUX can be used as a hardware solution for sharing D+/D- between devices. If your customer does not plan to use the D+/D- for anything else, then D+/D- can be connected directly to USB.

    Thanks,

    Ricardo

  • 0 in reply to Ricardo
    Mastermind 6100 points

    Hi,

    Thank you for your reply.
    Looking at the reference schematic of BQ25890, it says “Optional”.
    Does BQ25886 require a MUX for connections like this reference schematic?


    Does D + / D- pin become Hi-Z after detecting BC1.2?
    Also, could you tell me how long that detection takes?

    Our customer wants to connect this "Optional" connection directly.
    I would appreciate if you could give me some advice.

    I'm sorry for bothered you.

    Best regards,
    Yuto Sakai

  • 0 in reply to Yuto Sakai
    TI__Genius 10385 points

    Yuto,

    If there is a host sharing the D+/D- line you will need to use the MUX or a software delay on the host to allow for the detection to occur first. The detection takes approximately 1 second. After the D+/D- detection flow is complete, the D+ and D- pins will go HIZ. I hope this clears everything up.

    Thanks,

    Ricardo