LM335 Temperature Sensor

I am trying to use a LM335Z temperature sensor with the Cortex. I have used it with the Picaxe and Arduino microcontrollers with no problem, but have had trouble getting it to work with the Cortex. It may be because of the pull up and other resistor built in to the Cortex. Can you provide me with some assistance in getting it to work? I don’t want to use a different temperature sensor partially because I have a bunch of the LM335Z sensors.