Semiconductor temperature sensor
A semiconductor temperature sensor is a temperature sensor based on semiconductor materials . It generates an electrical quantity proportional to the absolute temperature. This electrical quantity can be represented in analog or digital form. The most common representatives of the genus emit an analog or digitally converted voltage, which in the latter case is usually transmitted serially, often via an I²C interface. The next most frequent display of the temperature takes place via the proportional frequency of a square wave . Because of the limited temperature range in which a semiconductor is functional, the application range of this temperature measurement method is limited to about 140 degrees Celsius . A microcontroller is often integrated into such a temperature sensor , which corrects the measurement errors of the actual semiconductor sensor .
The measuring circuit is a variant of the PTAT constant current source . The transistors for the two current mirrors are each implemented on the same semiconductor substrate.
Analog sensors
- AD592 current proportional to absolute temperature.
- KTY81 series Temperature-dependent resistor ( PTC ) based on Si.
- LM335 voltage proportional to absolute temperature.
Digital sensors
- DS18S20
- TSic-506 (precision sensor)
- AD7314