USB portable drive weirdness

phiscock-g851W1bGYuGnS0EtXVNi6w at public.gmane.org phiscock-g851W1bGYuGnS0EtXVNi6w at public.gmane.org
Fri Aug 10 02:40:00 UTC 2007


> Even with Y-cable, you have to plug into "powered" USB ports.  500mA is
> the max, but only for initial surge.  I believe steady-state max is
> about half of that (can't remember).

We rely on the fact that it's 500mA *continuous* to run our scope and
generator, and that seems to work. But there are many under-powered USB
ports out there, in which case you have to use a powered hub. Or steal
from two ports.

-- 
Peter Hiscocks
Syscomp Electronic Design Limited, Toronto
http://www.syscompdesign.com
USB Oscilloscope and Waveform Generator
647-839-0325

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