DS18B20

Programmable Resolution 1-Wire Digital Thermometer
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Status Explanations for product status codes

Part Number Status
DS18B20 Active: In Production. See Ordering Information for details.

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, equipment, or machinery, and process monitoring and control systems.

Data Sheet

Download this datasheet in PDF formatDownload Rev 4 (PDF, 260kB)
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Key Features

  • Unique 1-Wire Interface Requires Only One Port Pin for Communication
  • Each Device has a Unique 64-Bit Serial Code Stored in an On-Board ROM
  • Multidrop Capability Simplifies Distributed Temperature-Sensing Applications
  • Requires No External Components
  • Can Be Powered from Data Line; Power Supply Range is 3.0V to 5.5V
  • Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
  • ±0.5°C Accuracy from -10°C to +85°C
  • Thermometer Resolution is User Selectable from 9 to 12 Bits
  • Converts Temperature to 12-Bit Digital Word in 750ms (Max)
  • User-Definable Nonvolatile (NV) Alarm Settings
  • Alarm Search Command Identifies and Addresses Devices Whose Temperature is Outside Programmed Limits (Temperature Alarm Condition)
  • Available in 8-Pin SO (150 mils), 8-Pin µSOP, and 3-Pin TO-92 Packages
  • Software Compatible with the DS1822
  • Applications Include Thermostatic Controls, Industrial Systems, Consumer Products, Thermometers, or Any Thermally Sensitive System
 

Applications/Uses

  • Agricultural Equipment
  • Audio Equipment
  • Automotive
  • Climate Control
  • GPS Devices
  • Hard Disk Drive
  • Medical Equipment
  • Set-Top Boxes
  • Telecommunications
   

Key Specifications:

Temperature Sensors
Part Number Sensor Type Interface Accuracy
(±°C)		 Parasite Pwr. Temp. Thresh. Temp. Resolution
(bits)		 Multi Droppable Oper. Temp.
(°C)		 Budgetary
Price
See Notes
DS18B20  Local 1-Wire 0.5 Yes Programmable (NV)
9
10
11
12
 Yes -55 to +125 $1.85 @1k
See All Temperature Sensors (106)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.



Diagram

DS18B20: Block Diagram
Block Diagram

Technical Documents

App Note 27  Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products
App Note 120  Using an API to Control the DS1WM 1-Wire® Bus Master
App Note 122  Using Dallas' 1-Wire ICs in 1-Cell Li-Ion Battery Packs With Low-Side N-Channel Safety FETs Master
App Note 126  1-Wire® Communication Through Software
Tutorial 148  Guidelines for Reliable Long Line 1-Wire® Networks
App Note 158  1-Wire® Tagging with XML
App Note 162  Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment
App Note 187  1-Wire Search Algorithm
App Note 192  Using the DS2480B Serial 1-Wire® Line Driver
App Note 208  Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor
Reference Schematic 244  Advanced 1-Wire Network Driver
App Note 1100  White Paper 5: Using 1-Wire APIs for Data Sheet Commands
App Note 2420  1-Wire® Communication with a Microchip PICmicro Microcontroller
App Note 2965  1-Wire® Master Device Configuration
App Note 3754  Single-Wire Serial Bus Carries Isolated Power and Data
App Note 3930  Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices
App Note 4255  How to Power the Extended Features of 1-Wire® Devices
App Note 4277  Getting Started with the MAXQ2000 USB Thumb Evaluation Kit
App Note 4377  Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers
Reference Schematic 4477  Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note 4600  Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices
Tutorial 4679  Thermal Management Handbook
Tutorial 4699  Overview of Sensor Signal Paths
Tutorial 4700  Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing
App Note 5507  Understanding the DS1WM Synthesizable 1-Wire Bus Master
Reference Schematic 5508  Create a 1-Wire Master with Xilinx PicoBlaze

Product Guides

1-Wire® Products (PDF)
Thermal Management (PDF)

Reliability Reports

Reliability Report: DS18B20.pdf

Software/Models

DS18B20 IBIS Model

Ordering Information

Filters: Part Number Package: Temperature: Tape and Reel Sample
Part Number Free
Sample		 Buy Status Explanations for product status codes Recommended Replacement Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
DS18B20     N/A No Longer Available DS18B20+

 		 TO92;3 pin;19.5 mm²
-55°C to +125°C RoHS/Lead-Free: No
Materials Analysis
DS18B20+  
Active   TO92;3 pin;19.5 mm²
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS18B20+PAR  
Active   TO92;3 pin;19.5 mm²
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS18B20+T&R    
Active   TO92;3 pin;27.6 mm²
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS18B20-SL+T&R    
Active   TO92;3 pin;19.5 mm²
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS18B20-SL/T&R     N/A No Longer Available DS18B20-PAR+T&R

 		 TO92;3 pin;19.5 mm²
-55°C to +125°C RoHS/Lead-Free: No
Materials Analysis
DS18B20/GG8    
Active   TO92;3 pin;19.5 mm²
-55°C to +125°C RoHS/Lead-Free: No
Materials Analysis
DS18B20/T&R     N/A No Longer Available DS18B20-SL+T&R

 		 TO92;3 pin;27.6 mm²
-55°C to +125°C RoHS/Lead-Free: No
Materials Analysis
DS18B20U    
Active   µMAX;8 pin;15.6 mm²
-55°C to +125°C RoHS/Lead-Free: No
Materials Analysis
DS18B20U+  
Active   µMAX;8 pin;15.6 mm²
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
Part Number Free
Sample		 Buy Status Explanations for product status codes Recommended Replacement Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
DS18B20U+T&R    
Active   µMAX;8 pin;15.6 mm²
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS18B20U/T&R    
Active   µMAX;8 pin;15.6 mm²
-55°C to +125°C RoHS/Lead-Free: No
Materials Analysis
DS18B20Z    
Active   SOIC(N);8 pin;30.9 mm²
-55°C to +125°C RoHS/Lead-Free: No
Materials Analysis
DS18B20Z+  
Active   SOIC(N);8 pin;30.9 mm²
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS18B20Z+T&R    
Active   SOIC(N);8 pin;30.9 mm²
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS18B20Z/T&R    
Active   SOIC(N);8 pin;30.9 mm²
-55°C to +125°C RoHS/Lead-Free: No
Materials Analysis

Notes:
  1. Other options and links for purchasing parts are listed at: http://www.maximintegrated.com/sales.
  2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
  3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
  4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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More Information

New Product Press Release   [ 2001-07-27 ]


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Information Index

Overview

  

Design Resources

  

Ordering Info

  

Related Products

  
Description
Key Features
Applications/Uses
Key Specifications
Diagram
Notes and Comments
  Data Sheet
Technical Documents
Evaluation Kits
Reliability Reports
Software/Models
  Price and Availability
Samples
Buy Online
Package Information
Lead-Free Information
  Similar Products by Function
Similar Products by Application
Evaluation Kits
Products with Similar Part Numbers
Products Used With This
 
Rev 4; 2008-05-08
This page last modified: 2011-02-15