Wish for 2nd generation Neo: USB 2.0

Koen Kooi koen at dominion.kabel.utwente.nl
Sun Jan 21 14:21:16 CET 2007

Hash: SHA1

Harald Welte schreef:
> On Thu, Jan 18, 2007 at 10:23:24AM +0100, Sven Neuhaus wrote:
>> Since everyone is drooling about the next iteration of the Neo which is
>> exptected to include WiFi, I figured I'd add a request for USB 2.0. This
>> allows us to use a USB VGA adapter
>> (http://www.tomshardware.com/2005/06/08/add_a_monitor_using_usb/ - Linux
>> driver available!). A VGA port enables the Neo2 to replace a laptop for
>> doing presentations (in some cases) and you could even watch movies stored
>> on its microSD card (or streamed by a BluOnyx) on a battery powered HMD! :-)
> Thanks, this has actually already been on our wishlist for a future
> generation of our phones.
> The main problem (with more powerful SoC) is not to provide a USB2.0
> host port in the device.  The main problem is power.  You need a pretty
> powerful DC/DC step-up converter to provide the 5V power supply to the
> USB bus.  And you have to provide at least up to 100mA - but to support
> all devices, 500mA.

Newer SoCs like the omap2 series feature a charge pump for +5V to get at least detection
working. That would simplify things a lot since the hub doesn't have to provide power
'upstream' anymore.

Another thing to keep in mind: with 500mA you'll drain your 1200mAh batter in little over
2 hours with USB *alone*.



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