DS18B20数字温度传感器.docVIP

DS18B20 1-Wire Digital Thermometer FEATURES 1，Unique 1-Wire? Interface Requires Only One Port Pin for Communication 2，Each Device has a Unique 64-Bit Serial Code Stored in an On-Board ROM 3，Multidrop Capability Simplifies Distributed Temperature-Sensing Applications 4,Requires No External Components 5,Can Be Powered from Data Line; Power Supply Range is 3.0V to 5.5V 6,Measures Temperatures from -55°C to +125°C (-67°F to +257°F) ±0.5°C Accuracy from -10°C to +85°C 7,Thermometer Resolution is User Selectable from 9 to 12 Bits 8,Converts Temperature to 12-Bit Digital Word in 750ms (Max) 9,User-Definable Nonvolatile (NV) Alarm Settings 10,Alarm Search Command Identifies and Addresses Devices Whose Temperature is Outside Programmed Limits (Temperature Alarm Condition) 11,Available in 8-Pin SO (150 mils), 8-Pin μSOP,.and 3-Pin TO-92 Packages 12,Software Compatible with the DS1822 13,Applications Include Thermostatic Controls,Industrial Systems, Consumer Products,Thermometers, or Any Thermally Sensitive System PIN CONFIGURATIONS DESCRIPTION The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius 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. Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18B20s distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipmen