Re: [Gumstix-users] gumstix connections

[Alexander T. <ale...@es...>]

On Sun, Sep 11, 2011 at 8:47 PM, William Pretty Security Inc <
bil...@xp...> wrote:

>  Hi Nick;****
>
> A lot of this is covered on the wiki, but I’ll give you the short version
> J****
>
> ** **
>
> 1)            The Host is a high speed USB2 port ONLY. So you can attach
> either a memory key or hub or other USB2 device to it.****
>
>                 The OTG port is either a slave or a host depending on the
> cable. Which is why you need the mini-A to mini-B cable.****
>
>                 They are available from Digikey.****
>
> ** **
>
> 2)            You can only get about 100mA from the ports so a hub would be
> best. A hub also allows you to connect a USB1 device to the Gumstix.
>

The 100mA limit only applies to the OTG port, the host port should be able
to deliver 500mA. At least this is the case on the Tobi board, but I see no
reason why it would be different on the Summit. So if your (high-speed) hub
and devices do not draw more than 500mA in total you would not need to power
the hub and avoid the extra power supply.

Alexander