On Sun, Jan 21, 2007 at 06:56:30AM -0700, Joe Pfeiffer wrote: > Harald Welte writes: > > > >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. > > I don't see this is a real problem -- 1.1 is supposed to do that too. > I'd have to look at the specs (USB and USBToGo) but I don't think > unpowered USB is actually compliant under any of them.
It's not a technical problem per se. It's just that you have to have one extra (powerful) DC/DC step-up converter in the device, something that vendors of phones (and other devices) usually don't put there for cost, battery life time and PCB footprint reasons. -- - Harald Welte <[EMAIL PROTECTED]> http://openmoko.org/ ============================================================================ Software for the worlds' first truly open Free Software mobile phone _______________________________________________ OpenMoko community mailing list [email protected] https://lists.openmoko.org/mailman/listinfo/community
