2

I have a arduino set below:

pinMode(1,OUTPUT);
digitalWrite(1,LOW);

Now, I am expecting 1.2mA current flow through the pin that is set as output. Is that accepted? If so, what it the max current a pin can sink?

The current comes from a pul up resistor on the line

note: I can't protect it with a diode.

  • wouldn't INPUT allow more current? – dandavis Nov 9 '17 at 7:00
  • yes it would, but Really what I'm doing in toggling between input and output LOW. The goal is to toggle the node from 0V to 3.3V. – Ryan B. Nov 11 '17 at 16:08
4

Ok, I just found it.

from the arduno docs:

Atmega pins set aa output can source (provide positive current) or sink (provide negative current) up to 40 mA (milliamps) of current to other devices/circuits.

  • 4
    That's the absolute maximum rating. Recommended is 20mA – sempaiscuba Nov 8 '17 at 22:11
2

Yes it can. This blog post of mine will help to explain it.

In short:

It’s all so simple now, isn’t it? The output pin is just like a switch that either connects it to 5V or to ground.

1

can arduino on output mode sink current?

yes.

from the arduno docs:

the datasheet for the particular device is the best place for that answer.

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