Diode As Thermal Sensor

A sensor device embedded on microprocessors used to monitor the temperature of the processors die is also known as a thermal diode. When a diode is forward biased the resistance of a diode changes with temperature.

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An example kit from texas instruments is the lm95235eval evaluation and development system which can use diodes or transistors as temperature sensors.

Diode as thermal sensor. In this video i show how to use regular diode like the 1n4148 to measure temperature. Electrical diode thermal effect or function. It is a general silicon diode.

In this case the die temperature of a high speed op amp can be determined. This application of thermal diode is based on the property of electrical diodes to change voltage across it linearly according to temperature. The principle of using a diode as a temperature sensor is straightforward.

The voltage change over temperature can be used with a look up table or an equation to calculate a temperature for any given diode voltage. Transistors can use the collector emitter junction diode as the sense element figure 3 and many use small metallic can packages that can also make a good thermal mount to a unit under test. Diodes are not used in temperature sensing applica tions instead of 3 terminal devices such as the 2n3904.

Temperature sensors are designed for temperature compensation and measurement. Using a diode as a temperature sensor makes much sense if a diode is already in place for other reasons or if it can be integrated easier than other sensor types. Measure the temperature of an power led just by using the led itself.

Temperature sensors don. What is a temperature sensor diode. With a constant current applied the voltage across a diode or pn junction will decrease by approximately 1 to 2 mv0c over temperature.

Why would you use a diode instead of a real temperature sensor. The diode which serves as the sensing element in our scheme is in thermal contact with this resistor ie the diode and the 5w resistor can be assumed to be at the same temperature in steady state 2. As the temperature increases diodes forward voltage decreases.

A discrete 2 terminal diode ideally would perform in. Measuring the silicon temperature in an ic. I will show how it works.

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