Principle and application of single-wire digital temperature

Introduction to DALLAS single-wire digital temperature sensor DS18B20 The new "first-line device" has a smaller size, wider applicable voltage, and more economical. Dallas Semiconductor's digital temperature sensor DS1820 is the first temperature sensor in the world that supports the "one-wire bus" interface. The unique and economical characteristics of the one-wire bus enable users to easily build sensor networks and introduce new concepts for the construction of measurement systems. DS18B20, DS1822 "One-wire bus" digital temperature sensor is the same as DS1820, DS18B20 also supports "One-wire bus" interface, the measurement temperature range is -55°C~+125°C, in the range of -10~+85°C, the accuracy is ±0.5°C. The accuracy of DS1822 is poorer than ± 2°C. The field temperature is directly transmitted in the digital mode of "one wire bus", which greatly improves the anti-interference of the system. Suitable for on-site temperature measurement in harsh environments, such as: environmental control, equipment or process control, temperature measurement consumer electronics, etc. Different from the previous generation products, the new product supports a voltage range of 3V~5.5V, which makes the system design more flexible and convenient. And the new generation products are cheaper and smaller. Features of DS18B20 and DS1822 DS18B20 can be programmed with a resolution of 9-12 bits, with an accuracy of ±0.5°C. Optional smaller package, wider voltage application range. The resolution setting and the alarm temperature set by the user are stored in EEPROM, and they are still stored after power failure. The performance of DS18B20 is the best among new generation products! The performance-price ratio is also excellent! DS1822 is software compatible with DS18B20 and is a simplified version of DS18B20. The EEPROM storing user-defined alarm temperature and resolution parameters is omitted, and the accuracy is reduced to ±2°C. It is suitable for applications with low performance requirements and strict cost control. It is an economical product. Following the early products of "one-wire bus", DS1820 opened up a new concept of temperature sensor technology. DS18B20 and DS1822 make voltage, characteristics and packaging have more choices, so that we can build our own economical temperature measurement system.