DS18B20單線數(shù)字溫度傳感器
5000多字


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.

關鍵詞：

DS18B20 temperature conversion POWERING


DS18B20數(shù)字溫度計提供9位溫度讀數(shù),指示器件的溫度信息經(jīng)過單線接口送入DS18B20或從DS18B20送出因此從中央處理器到DS18B20僅需連接一條線和地讀寫和完成溫度變換所需的電源可以由數(shù)據(jù)線本身提供而不需要外部電源。因為每一個DS18B20有唯一的系列號（silicon serial number）因此多個DS18B20可以存在于同一條單線總線上這允許在許多不同的地方放置溫度靈敏器件此特性的應用范圍包括HVAC環(huán)境控制建筑物設備或機械內的溫度檢測以及過程監(jiān)視和控制中的溫度檢測。