Hi!
> > That's not actually 100% clear to me - for what the wm831x is doing it
> > probably *does* want the higher limit. This is a system inflow limit
> > (as it should be for this), at least the charger will adapt to voltage
> > variations though other users in the system are much less likely to do
> > so.
>
> Interesting ... I hadn't considered that possibility.
>
> As long as the current remains below the maximum, the charger will
> reduce the voltage towards 2V as load increases. Somewhere before it
> gets there, the system will not be able to make use of the power as the
> voltage will be too low to be usable. So that will naturally limit the
> current being drawn.
>
> Not having very much electrical engineering background, I cannot say for
> sure what will happen, but it seems likely that once the voltage drops
> much below 4.75V, the charger won't be operating at peak efficiency,
> which would be a waste.
> I can easily imagine that the hardware would switch off at some voltage
> level, rather than just making do with what is there.
> So I'm skeptical of this approach, but I'm open to being corrected by
> someone more knowledgeable than I.
Devices I seen charge down to ~4.2V. This is useful thing to play
with:
dx.com: 406496
1" USB Current & Voltage Detector Tester Meter w/ Red LED Display -
Blue
Best regards,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
