[MinnowBoard] Minnowboard Max - power from USB port (questions)

[Douglas Kryder]

i read this also, today. at least one downside would be the voltage of the
hub being greater than 5v. my hub, for instance, is powered by 12v power
supply and i'm not certain how that is cobtrolled by the hub. however, i do
not get the power leds staying lit up as you mentioned, so hopefully i'm
ok. i just have a hard time thinking that the design of the hub would allow
leakage out into the usb connector but i have fingers crossed anyway.

On Mon, Jun 13, 2016 at 4:38 PM, Chris Brookes <chris at txrx.org> wrote:

> I saw the wiki entry on how a powered USB device might wind up pushing
> juice in to the Minnowboard Max due to the lack of a diode in the design. I
> have seen this happen myself and the Minnowboard, at least for the few
> minutes I had it in this state, did not appear to suffer and did seem to
> work properly. Interestingly, in this state with power from 2 sources, if I
> unplugged either it would continue to operate as if nothing odd had
> happened. It was sort of like having dual independent PSU’s.
>
> What is the risk in leaving it in this state? It’s obviously out of spec,
> not a good idea generally and so on, but what could happen, what probably
> would happen, and what (if anything?) definitely will happen if it’s left
> to operate in this state for any period of time?
>
> Just curious…
>
> Chris
>
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