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DS18B20-PAR: 1-Wire Parasite-Power Digital Thermometer Data Sheet (Rev. 1)11/19/2003PDF221K
Overview
Features and Benefits
- 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
Product Details
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.
Applications
- Remote Sensing Applications
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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UG-4277: Getting Started with the MAXQ2000 USB Thumb Evaluation Kit9/24/2008PDF301K
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1-Wire Search Algorithm3/28/2002
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Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices9/25/2009
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Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers3/18/2009
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Single-Wire Serial Bus Carries Isolated Power and Data3/23/2006
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DS18B20-PAR/DS18S20-PAR/DS1822-PAR Advantages for Remote Temperature Sensing8/27/2002
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Overview of Sensor Signal Paths5/12/2010
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Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing5/10/2010
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Thermal Management Handbook5/4/2010
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How to Power the Extended Features of 1-Wire® Devices6/17/2008
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Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices11/16/2006
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1-Wire Master Device Configuration3/3/2004
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1-Wire Communication with a Microchip PICmicro Microcontroller9/16/2003
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Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor6/20/2002
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1-Wire® Tagging with XML6/7/2002
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White Paper 5: Using 1-Wire APIs for Data Sheet Commands6/7/2002
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1-Wire Communication Through Software5/30/2002
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Using the DS2480B Serial 1-Wire® Line Driver3/12/2002
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Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment3/8/2002
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Guidelines for Reliable Long Line 1-Wire Networks11/16/2001
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Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products3/29/2001
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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