ad590 help

jln646v

I am attempting to use the AD590 temperature sensor with a BOE. I am using the code from the webappliedsensors.pdf and have it hooked up as they have it shown in the schematic. The problem i am having is the numbers i am getting out through the debug terminal never change. They are like 16000 or something and they never change no matter what temperature the senor is. The code is sampling correctly and everything is hooked up correctly because if i unplug the sensor from the vdd it changes or when i hook up a potentiometer in place of the sensor i get changing numbers. I have tried a few diffrent sensors of the same type and always have this problem. Is there something additional i need to do? HAs anyone else had this problem? ANY help would be greatly appreciated.

Tracy Allen

Are you sure the sensor is oriented correctly, not backwards? If you have a multimeter that has a microamps range, hook it up in series with the sensor and a 5 or 6 volt power supply. The current should be around 300 microamps (300 Kelvin = 27 degrees Celsius).

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Tracy Allen
www.emesystems.com