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Thread: USB hub setup question

  1. #1
    Variable Bitrate debugger's Avatar
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    USB hub setup question

    OK, I've got 5v or self powered 4 port USB hub. Should I leave it self powered of run a 5v wire to it?

    These are devices that are connected to it:
    1.touchscreen usb
    2.mouse touchpad
    3.keyboard (will be pluged in only when needed)
    4.external dvd-rom drive (self powered from the same usb)

    Any other suggestions?

    Other 3 USB ports from the motherboard will be used for:

    1.GPS
    2.video capture card (self powered)
    3.bluetooth

    I'm using M2-ATX PSU by the way...

  2. #2
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    run power to it for sure

  3. #3
    Newbie
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    what kind of touchpad do you have? /offtopic
    project in the works....no worklog but i will post a completed thread.

  4. #4
    FLAC ppgt94's Avatar
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    Depends on what you connect to the hub. If the overall load exceeds more than around 500mw you're going to have problems. Just do it right the first time and run 5v from your PSU.

  5. #5
    Maximum Bitrate Sidewalksalvage's Avatar
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    I say test it and see. You most likely cannot damage a unit with a lack of power (unless its like a flash card or something...) If you find things are lagging or just not working properly hit the hub with external power...otherwise dont worry...

    just a few extra questons...is it USB 1.1 or 2.0?
    and when you say the DVD is self powered from the same usb...what does it mean? The DVD gets is power from the USB port???

    if thats the case i say put the DVD direct into the mobo...and put a different periferal on the hub.
    Brown 2010

  6. #6
    Variable Bitrate debugger's Avatar
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    Quote Originally Posted by Sidewalksalvage
    I say test it and see. You most likely cannot damage a unit with a lack of power (unless its like a flash card or something...) If you find things are lagging or just not working properly hit the hub with external power...otherwise dont worry...

    just a few extra questons...is it USB 1.1 or 2.0?
    and when you say the DVD is self powered from the same usb...what does it mean? The DVD gets is power from the USB port???

    if thats the case i say put the DVD direct into the mobo...and put a different periferal on the hub.

    Good suggestion. The usb is 2.0. DVD-ROM is only powered by single usb 2.0 and it uses the same cable for connection.

  7. #7
    Variable Bitrate debugger's Avatar
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    Quote Originally Posted by NotDave
    what kind of touchpad do you have? /offtopic

    http://cgi.ebay.com/Mozilla-Firefox-...QQcmdZViewItem

  8. #8
    Variable Bitrate debugger's Avatar
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    Quote Originally Posted by ppgt94
    Depends on what you connect to the hub. If the overall load exceeds more than around 500mw you're going to have problems. Just do it right the first time and run 5v from your PSU.
    Is there a 5v rail on M2-ATX? Also, should I use the 12v rail from M2-ATX to power my LCD or I'm better of powering it from "+" that used to be connected to the in-dash cd-player? In this case, the amp remote turn on connector from the M2-ATX is going to be connected to both: the amp and the LCD. It doesn't really matter where the constant current is coming from, right?

  9. #9
    Constant Bitrate
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    Quote Originally Posted by debugger
    Is there a 5v rail on M2-ATX? Also, should I use the 12v rail from M2-ATX to power my LCD or I'm better of powering it from "+" that used to be connected to the in-dash cd-player? In this case, the amp remote turn on connector from the M2-ATX is going to be connected to both: the amp and the LCD. It doesn't really matter where the constant current is coming from, right?
    Check the M2-ATX documentation. There are maximum limits on each of the rails. Drawing more power than what the device can supply is.. not good.

    The M2-ATX 5v and 12v rail are rated at 8A each. 12A peak and 9A peak respectively.

  10. #10
    Variable Bitrate debugger's Avatar
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    Quote Originally Posted by piabu
    Check the M2-ATX documentation. There are maximum limits on each of the rails. Drawing more power than what the device can supply is.. not good.

    The M2-ATX 5v and 12v rail are rated at 8A each. 12A peak and 9A peak respectively.
    So each USB port takes 2A?

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