Current level from Digital output?

[aarn660]

I am looking into using a virtual bench for a demo with my company. I was just wondering what kind of current levels the digital outputs can supply. 

[crossrulz]

Read the specificiation.  It clearly states that the DIO can source 4mA.

[aarn660]

Thank you for your quick reply. I had not previously been able to find those specifications. They will be quite useful. Looking through it though, does the 3.3v output not supply 20mA instead of 4mA?

[DLarsen]

That is correct, the 3.3V output pin on the GPIO connector will source 20mA.  All GPIO signal pins source or sink up to 4mA in normal operation.

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Daniel Larsen

Staff Digital Hardware Engineer

National Instruments

[aarn660]

Just to clarify, are all 8 of the GPIOs able to output 3.3v at 20mA, or is there only one GPIO that is able to do this?

[DLarsen]

There is one pin labeled "+3.3V" which is a static supply capable of 20mA.  The 8 GPIOs are each only capable of 4mA drive strength.  So none of the actual GPIOs are capable of 20mA.

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Daniel Larsen

Staff Digital Hardware Engineer

National Instruments