[En-Nut-Discussion] using internal power supply for other circuits

[Alexander Baranov]

Well, I control the LED of optocoupler directly from AVR' s port because it 
does not need more than  8-10mA to open the transistor. I want to believe 
that ARM's port can drive 10mA in zero state.
Good luck.
----- Original Message ----- 
From: "scostas" <scostas at det.uvigo.es>
To: "Ethernut User Chat (English)" <en-nut-discussion at egnite.de>
Sent: Wednesday, April 12, 2006 5:21 AM
Subject: [En-Nut-Discussion] using internal power supply for other circuits


> Hi all:
>
> I want to control some LEDs and optocouplers from the Ethernut, but
> Idon't want  to overcharge the internal 3.3 regulator. What is the
> maximum charge I can add to it? I don't want to use an external power
> supply for this (only for the circuits controled by the optocouplers).
>
> Another question: is safe to control the optocouplers and LEDs directly
> from the outputs, or is better to use a transistor in the middle to
> avoid an excesive current in the ports?
>
> Thanks.
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