1.Temperature sensorHow it works--Digital temperature sensing

It uses a silicon process to produce a digital temperature sensor that uses a PTAT structure that has precise, temperature-dependent output characteristics. The output of PTAT is modulated into a digital signal by a duty cycle comparator. The relationship between duty cycle and temperature is as follows: DC = 0.32 + 0.0047 * t, and t is Celsius. The output digital signal is compatible with the microprocessor MCU. The high-frequency sampling of the processor can calculate the duty cycle of the output voltage square wave signal to obtain the temperature. This temperature sensor has a resolution better than 0.005K due to its special process. Measuring temperatures range from -45 to 130 ° C, it is widely used in high precision applications.

The use of various physical properties of the material as a function of temperature changes the temperature into an available output signal. Temperature Wistron sensors are the core of temperature measuring instruments and come in a wide variety. According to the measurement method, it can be divided into two types: contact type and non-contact type. According to the characteristics of sensor materials and electronic components, it can be divided into two types: thermal resistance and thermocouple. The modern temperature sensor is very small in shape, which makes it widely used in various fields of production practice, and also provides countless conveniences and functions for our lives.

2. How Temperature Sensors Work--Classification

There are four main types of temperature sensors: thermocouples, thermistors, resistance temperature detectors (RTDs), and IC temperature sensors. The IC temperature sensor includes two types of analog output and digital output.