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USB charger detection and other component layouts for d+ d-

Chris Hamilton
Intellectual 270 points

Hi, I am building a USB charger based power supply.  I am including OTG negotiation and Battery Charging Detection (BCD) to negotiate.  I have looked through various switches with BCD capability from TI, Fairchild, and various others.  It seems that most component designs do not keep the D+ and D- pins oriented toward the USB connector layout.  I am confused as to why this is OK given so many application notes about routing the traces with careful impedance.  Most TI and other brand switches need to cross over D+ and D- and in some cases need to cross over again after leaving the switch to realign with the uc after the switch.  I have found only a few that do not require crossing D+ and D- across half a dozen brands and dozens of implementations and packaging.  Am I missing something?

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    TI__Genius 10370 points
    Hi,

    I apologize that no one has followed up with your question. I'm going to close this thread, but if you still have a question please feel free to post a brand new thread instead of replying to this one. We will do our very best to respond within 24 hours to any new post you might have :-)

    Best Regards,
    Aramis P. Alvarez