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### Topic: At what voltage is a digital pin HIGH? (Read 3442 times)previous topic - next topic

#### holmes4

##### Oct 15, 2012, 08:56 pm
From the datasheet Section 28.2, for an UNO running at 5V a digital input will read high at a voltage of just 0.6V. Is this correct?.

Mark

#1
##### Oct 15, 2012, 09:03 pm
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VCC = 2.4V - 5.5V

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2. "Min." means the lowest value where the pin is guaranteed to be read as high

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Is this correct?

Given the conditions, that's my interpretation.

#### retrolefty

#2
##### Oct 15, 2012, 09:14 pmLast Edit: Oct 15, 2012, 09:17 pm by retrolefty Reason: 1

From the datasheet Section 28.2, for an UNO running at 5V a digital input will read high at a voltage of just 0.6V. Is this correct?.

Mark

No, the spec is saying that the minimum input pin voltage needed to be detected as a HIGH is .6 X Vcc (60% of the actual Vcc voltage being used). So for a 5 volt arduino board the minimum input pin voltage guaranteed to be detected as a HIGH is +3.0 vdc.
For a 3.3vdc powered board the value would be 1.98vdc.
Lefty

Ah, TC beat me to it.

#### holmes4

#3
##### Oct 15, 2012, 09:20 pm
@retro and TC

now that makes a lot more sense!

Mark

#4

#### retrolefty

#5
##### Oct 15, 2012, 10:12 pm

Well at least you cast your answer as an interpretation, not a fact.

Lefty

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