ds18b20单线数字温度传感器.doc

DS18B20单线数字温度传感器
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摘要：
The DS18B20 Digital Thermometer provides 9 to 12–bit centigrade temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of –55°C to +125°C and is accurate to _0.5_C over the range of –10°C to +85°C. In addition, the DS18B20 can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply.

关键词：

DS18B20 temperature conversion POWERING


DS18B20数字温度计提供9位温度读数,指示器件的温度信息经过单线接口送入DS18B20或从DS18B20送出因此从中央处理器到DS18B20仅需连接一条线和地读写和完成温度变换所需的电源可以由数据线本身提供而不需要外部电源。因为每一个DS18B20有唯一的系列号（silicon serial number）因此多个DS18B20可以存在于同一条单线总线上这允许在许多不同的地方放置温度灵敏器件此特性的应用范围包括HVAC环境控制建筑物设备或机械内的温度检测以及过程监视和控制中的温度检测。