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Data Sheet

FULL DATA SHEET (PDF, 208kB) Download   E-Mail

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		Applications/Uses
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		Remote Sensing Applications

Diagram

Pin Configuration

Application Notes

Application Note 162: Interfacing the DS18X20/DS1822 1-Wire Temperature Sensor in a Microcontroller Environment - DS18B20-PAR Application Note 203: DS18B20-PAR/DS18S20-PAR/DS1822-PAR Advantages for Remote Temperature Sensing - DS18B20-PAR Application Note 1100: White Paper 5: Using 1-Wire APIs for Data Sheet Commands - DS18B20-PAR Application Note 3930: Package Thermal Resistance Values (Theta JA, Theta JC) for Dallas Semiconductor Temperature Sensors - DS18B20-PAR

Evaluation Kits

none

Design Guides

TEMP SENSORS (PDF) BATTERY MANAGEMENT (PDF) 1-Wire® PRODUCTS (PDF)

Reliability Reports

Request Reliability Report for: DS18B20-PAR

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * 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.
Devices: 1-3 of 3
DS18B20-PAR	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS18B20-PAR			TO92;3 pin; Dwg: 21-0248 (PDF) Use pkgcode/variation: Q3-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS18B20-PAR/T&R			TO92;3 pin; Dwg: 21-0250 (PDF) Use pkgcode/variation: Q3-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS18B20-PAR+T&R			TO92;3 pin; Dwg: 21-0250 (PDF) Use pkgcode/variation: Q3+4*	-40°C to +85°C	See data sheet Materials Analysis

More Information

Temperature Family by Product Type

Related Products

DS18B20 Programmable Resolution 1-Wire Digital Thermometer DS1822-PAR Econo Parasite-Power Digital Thermometer

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

Data Sheet   Application Notes   Design Guides   Engineering Journals   Reliability Reports   Software/Models   Evaluation Kits

Price and Availability   Samples   Buy Online   Package Information   Lead-Free Information

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