Sensor Temperature LED voltage

Spartan 3 Lite
1

Hello-
I would like to know the 'Sensor Temperature LED output" (blue wire) voltage so I can see if it is suitable to log as a digital input with a trigger threshold of 3.5V.

I don’t yet have my unit to check it, so I was hoping someone here could let me know, if it happens to be 3.3V then I’ll need to add some hardware to adjust the voltage.

Thanks!

2

To answer my own question - it appears to be 1.8V. So I will have to up the voltage to use it as a digital signal.

3

This leads to another question. Since it’s such a low voltage, is this really an LED driver circuit? Is anyone actually using it to drive an LED and can share what type?
Is there a limit on the amp draw of this wire?

I just want to make sure it isn’t a 1.8V UART microcontroller output before I amplify it’s voltage (if it is, I’d need a transistor based solution).

Thanks for any information!