4 May
2012
4 May
'12
2:10 p.m.
On 4 May 2012 at 20:36, Tony Duell wrote:
One thign that IMHO USB did get right was to haev a
power line on the
interface conenctor. Many times with other interfaces I've needed to
invert a sgnal line, or do a little bit of logic on them, or something
and don't want to have an external PSU.
Well, ethernet (PoE) is going that way, but in a bigger sense (ca.
44V at 350 ma.).
Most modern PCs will continue to supply power to the USB connectors
even when "off" (soft "off"), so mobile devices can be charged even
when the system isn't being used.
And USB as a cheap source of power makes all of those really cool
devices--shavers, foot warmers, fans, etc. possible.
--Chuck