The DS18B20-PAR 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-PAR does not need an external power supply because it derives power directly from the data line ("parasite power"). The DS18B20-PAR communicates over a 1-Wire® bus, which 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 +100°C and is accurate to ±0.5°C over a range of -10°C to +85°C.
Each DS18B20-PAR has a unique 64-bit identification code, which allows multiple DS18B20-PARs to function on the same 1-wire bus; thus, it is simple to use one microprocessor to control many DS18B20-PARs distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment or machinery, and process monitoring and control systems.
关键特性
应用/使用
Unique 1-Wire Interface Requires Only One Port Pin for Communication
Derives Power from Data Line ("Parasite Power")—Does Not Need a Local Power Supply
Multi-Drop Capability Simplifies Distributed Temperature Sensing Applications
Requires no External Components
±0.5°C Accuracy from -10°C to +85°C
Measures Temperatures from -55°C to +100°C (-67°F to +212°F)
Thermometer Resolution is User-Selectable from 9 to 12 Bits
Converts Temperature to 12-Bit Digital Word in 750ms (max.)
User-Definable Non-Volatile Temperature Alarm Settings
Alarm Search Command Identifies and Addresses Devices Whose Temperature is Outside of Programmed Limits (Temperature Alarm Condition)
Software compatible with the DS1822-PAR
Ideal for Use in Remote Sensing Applications (e.g., Temperature Probes) That do not Have a Local Power Source
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