DS18B20-PAR:1-Wire Parasite-Power Digital Thermometer

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.

Key Features
  • 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
Applications/Uses
  • Remote Sensing Applications
DataSheet
titleDownload file
DS18B20-PAR Data SheetDS18B20-PAR.pdf
Parametrics
Part NumberSensor TypeInterfaceChannelsAccuracy
(±°C)
Parasite Pwr.Temp. Thresh.Temp. Resolution
(bits)
Multi DroppableOper. Temp.
(°C)
Package/PinsBudgetary
Price
See Notes
DS18B20-PARLocal1-WireOne0.5YesProgrammable (NV)9
10
11
12
Yes-55 to +100TO92/3$2.40 @1k
Related Products
  • DS1822-PAR:Econo Parasite-Power Digital Thermometer
  • DS18B20:Programmable Resolution 1-Wire Digital Thermometer
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS18B20-PARNo Longer AvailableDS18B20+T&RTO92,;3 pin;19.5 mm²-40°C to +85°CNo
DS18B20-PAR+T&RActiveTO92,;3 pin;27.6 mm²-40°C to +85°CLead Free
DS18B20-PAR/T&RNo Longer AvailableDS18B20+PARTO92,;3 pin;27.6 mm²-40°C to +85°CNo
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