-----BEGIN PGP SIGNED MESSAGE----- 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*. regards, Koen -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (Darwin) iD8DBQFFs2jMMkyGM64RGpERAtGaAJ98L5NgwDXgF8VB4VjCi6aqg8S7ygCgnbe6 YvZlABNBSWlIF+YEJlZcdAU= =PL/Q -----END PGP SIGNATURE----- _______________________________________________ OpenMoko community mailing list [email protected] https://lists.openmoko.org/mailman/listinfo/community
