Charge via USB3.0?

Discussion in 'iPad' started by Kaemon, May 21, 2010.

  1. Kaemon macrumors member

    Jun 22, 2009
    I have a computer with a Asus P6X58D motherboard, with USB3.0 and I know that the iPad can't charge via USB2.0 unless its like a high powered one or something, but since USB3.0 puts out more power (or so I've heard) would I be able to charge the ipad via that?

    I pick it up later today and am just wondering on the situation...
  2. Battlestar macrumors 6502

    May 9, 2010
    4. What other improvements does USB 3.0 provide?
    The enhancements to SuperSpeed USB are not just for higher data rates, but for improving the interaction between device and host computer. While the core architectural elements are inherited from before, several changes were made to support the dual bus arrangement, and several more are notable for how users can experience the improvement that USB 3.0 makes over USB 2.0:

    * More power when needed
    o 50% more power is provided for unconfigured or suspended devices (150 mA up from 100 mA), and 80% more power is available for configured devices (900 mA up from 500 mA). This means that more power-hungry devices could be bus powered, and battery powered devices that previously charged using bus power could potentially charge more quickly.
    o A new Powered-B receptable is defined with two extra contacts that enable a devices to provide up to 1000 mA to another device, such as a Wireless USB adapter. This eliminates the need for a power supply to accompany the wireless adapter...coming just a bit closer to the ideal system of a wireless link without wires (not even for power). In regular wired USB connections to a host or hub, these 2 extra contacts are not used.

    * Less power when it's not needed
    Power efficiency was a key objective in the move to USB 3.0. Some examples of more efficient use of power are:
    o Link level power management, which means either the host computer or the device can initiate a power savings state when idle
    o The ability for links to enter progressively lower power management states when the link partners are idle
    o Continuous device polling is eliminated
    o Broadcast packet transmission through hubs is eliminated
    o Device and individual function level suspend capabilities allow devices to remove power from all, or portions of their circuitry not in use

    Source: SuperSpeed USB 3.0 FAQ
  3. Jeff Flowerday macrumors regular

    Aug 23, 2007
    Calgary, AB
    Just an FYI, the iPad still indicates not charging with USB 3.0 ports.

    I still need to investigate if it does actually trickle charges faster on the USB 3.0 over USB 2.0 ports when in sleep mode.

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