The measuring temperature range is -55 degrees C~+125 degrees C, and the accuracy is within 0.5 degrees C in the range of -10~+85 C. The accuracy of the DS1822 temperature sensor is less than 2 degrees C. The field temperature is transmitted directly by the "one-wire bus" digital mode, which greatly improves the anti-interference ability of the system. Suitable for field temperature measurement in harsh environment, such as environmental control, equipment or process control, temperature measurement consumer electronic products, etc. Unlike the previous generation, the new product supports the voltage range of 3V to 5.5V, which makes the system design more flexible and convenient. And the new generation of products is cheaper and smaller.
DS1820 temperature sensor, DS18B20 temperature sensor and DS1822 temperature sensor all support the "one-wire bus" interface.
DS1822 temperature sensor is compatible with DS18B20 temperature sensor software and is a simplified version of DS18B20 temperature sensor. EEPROM, which stores user-defined alarm temperature and resolution parameters, is omitted and its accuracy is reduced to (+2) C. It is suitable for applications with low performance requirements and strict cost control. It is an economic product. The performance of the DS18B20 temperature sensor is the best among the new generation products.
The internal structure of DS18B20 temperature sensor mainly consists of four parts: 64-bit photolithography ROM, temperature sensor, non-volatile temperature alarm trigger TH and TL, and configuration register.
1. GND is the power source.
2. DQ is the digital signal input / output terminal.
3. VDD is the input terminal of the external power supply (grounding when parasitic power is connected).