Teensy 3.1 digital input voltage limit?

[rbrockman]

I see that the Teensy 3.1 digital inputs are 5v tolerant. I'd like to understand that a bit more.

If the sink current is limited to <5mA or so, at what point does the actual voltage become an issue? Example: 15 VDC limited to 5mA into a digital input pin.

Is the limitation on both the voltage and current, or just the current sink?

Any input would be appreciated.

 

[instrumentek]

What about using a basic voltage divider? Always better safe then sorry

 

[stevech]

Yes. Don't exceed the spec sheet limits.