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DS18B20-PAR

DS18B20-PAR

1-Wire Parasite-Power Digital Thermometer

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Overview

Description

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

Parametric Specs

See parametric specs for Temperature Sensors (113)


Part NumberSensor TypeInterfaceChannelsAccuracy
(±°C)		Parasite Pwr.Temp. Thresh.Temp. Resolution
(bits)		Multi DroppableOper. Temp.
(°C)		Package/PinsBudgetary
Price
See Notes
DS18B20-PAR Local1-WireOne0.5YesProgrammable (NV)
9
10
11
12
Yes-55 to +100
TO92/3
$2.52 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Technical Documents

Reference Schematic 5508 Create a 1-Wire Master with Xilinx PicoBlaze
App Note 5507 Understanding the DS1WM Synthesizable 1-Wire Bus Master
Tutorial 4700 Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing
Tutorial 4699 Overview of Sensor Signal Paths
Tutorial 4679 Thermal Management Handbook
App Note 4600 Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices
Reference Schematic 4477 Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note 4377 Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers
App Note 4277 Getting Started with the MAXQ2000 USB Thumb Evaluation Kit
App Note 3930 Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices
App Note 3754 Single-Wire Serial Bus Carries Isolated Power and Data
App Note 2965 1-Wire Master Device Configuration
App Note 2420 1-Wire Communication with a Microchip PICmicro Microcontroller
App Note 1100 White Paper 5: Using 1-Wire APIs for Data Sheet Commands
Reference Schematic 244 Advanced 1-Wire Network Driver
App Note 208 Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor
App Note 203 DS18B20-PAR/DS18S20-PAR/DS1822-PAR Advantages for Remote Temperature Sensing
App Note 192 Using the DS2480B Serial 1-Wire® Line Driver
App Note 187 1-Wire Search Algorithm
App Note 162 Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment
App Note 158 1-Wire® Tagging with XML
Tutorial 148 Guidelines for Reliable Long Line 1-Wire Networks
App Note 126 1-Wire Communication Through Software
App Note 27 Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products

Additional Resources

Temperature Family by Product Type

Quality And Environmental

Request Reliability Report for: DS18B20-PAR 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Technical Docs

Type ID Title
Reference Schematic 5508 Create a 1-Wire Master with Xilinx PicoBlaze
App Note 5507 Understanding the DS1WM Synthesizable 1-Wire Bus Master
Tutorial 4700 Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing
Tutorial 4699 Overview of Sensor Signal Paths
Tutorial 4679 Thermal Management Handbook
App Note 4600 Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices
Reference Schematic 4477 Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note 4377 Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers
App Note 4277 Getting Started with the MAXQ2000 USB Thumb Evaluation Kit
App Note 3930 Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices
App Note 3754 Single-Wire Serial Bus Carries Isolated Power and Data
App Note 2965 1-Wire Master Device Configuration
App Note 2420 1-Wire Communication with a Microchip PICmicro Microcontroller
App Note 1100 White Paper 5: Using 1-Wire APIs for Data Sheet Commands
Reference Schematic 244 Advanced 1-Wire Network Driver
App Note 208 Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor
App Note 203 DS18B20-PAR/DS18S20-PAR/DS1822-PAR Advantages for Remote Temperature Sensing
App Note 192 Using the DS2480B Serial 1-Wire® Line Driver
App Note 187 1-Wire Search Algorithm
App Note 162 Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment
App Note 158 1-Wire® Tagging with XML
Tutorial 148 Guidelines for Reliable Long Line 1-Wire Networks
App Note 126 1-Wire Communication Through Software
App Note 27 Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products

Reference Designs