Vasile Surducan wrote:
> > "...an external device _sourcing_, say, 20 mA."
> >
> > Open drain should sink current.
> >
>
>   Are you positive sure ? I think an open drain could also
> sink current...
> No one say that PIC can't be supplied with Vdd = 0V and
> GND = -5V.
> So, in respect to the human convention of standardize
> everything, then sourcing and sinking are just some words
> related to ground, which can be any...

Why ground? Why not a point of connection?
The point where open drain connects to external device.
External device sources current to open drain through this
point. Open drain sinks current from external device.
Current flows from "+" to "-"(ground); like water from a
greater height to a lower.

Am I wrong?

Best Regards,

Mike.

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