[TriLUG] Ideas for Replacing Home Office Workhorse Computer?

[shay walters via TriLUG]

If the RDSon is low enough, the port could draw enough power to shut down
the power supply, shutting things down before any action could be taken to
turn it off.  (I say, hypothetically.)  It happened a while back, and it
was a pretty old laptop at the time (Dell if I recall correctly), so maybe
things weren't advanced enough back then to deal with a short.
    Anyway, I'm glad to hear that you were able to get your computer
resuscitated.

-Shay


On Mon, Jan 7, 2019 at 10:24 AM Matt Flyer via TriLUG <trilug at trilug.org>
wrote:

> From what I remember in the USB (host controller) design I did several
> years ago, it used a certain FET transistor with a known RDSon and then
> measured the voltage across the FET.  As long as the current were
> flowing out of the +5 power source to the USB port, it would get
> detected regardless of the return path.
>
>
> On Mon, 2019-01-07 at 15:05 +0000, Brian Henning via TriLUG wrote:
> > >  Maybe you're
> > right about the current not being sensed if it's not flowing through
> > both USB power pins.  I stand by my statement that that's a really
> > bad design, though!
> >
> > -B
> >
> > <snip>
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