Dennis Lee Bieber  wrote:
> On Sun, 21 Jun 2020 13:43:44 +0200, Deloptes  declaimed
> the following:
>
> >
> >OK, now I understand. It might depend on the cables, because as mentioned
> >recent USB2 cables (mainly provided with phone chargers) are capable of
> >caring the load (2A*5V=10W)
> >
>
>         And do those cables also provide data transfer? I've had a few cell
> phones that came with power-only USB-2 cables -- no data pins. {And
> strangely, one of those would NOT charge using a common USB-2 charger [vs
> phone dedicated charger] but WOULD charge when plugged into a laptop at
> work... and I don't think the laptop had those special "charge mode" USB
> ports)
>
Yes, if you look into it the USB 'standard' is quite complicated
in that cables can be 'power only' and in that case there may be
resistors across pins to indicate this to the devices at the ends.

This is only for 'old fashioned' mini- or micro-B cables, USB C is a
whole new ball game, much more complex.

--
Chris Green
·

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