Datasheet for the LM335 precision temperature sensor, a 210 KB PDF. The device behaves like a two-terminal Zener whose breakdown voltage tracks absolute temperature at about 10 mV per kelvin, with an optional adjust pin for calibration. Use the document to confirm package pinout, the recommended bias current and the expected voltage at a known temperature. When a reading seems wrong, check the bias resistor value and the calibration trimmer before suspecting the sensor, and remember that the output is referenced to kelvin rather than Celsius.
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