DS18B20-PAR 1-Wire Parasite-Power Digital Thermometer

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

Key Specifications: Temperature Sensors

Part Number

Sensor Type

Interface

Accuracy
(±°C)

Parasite Pwr.

Temp. Thresh.

Temp. Resolution
(bits)

Multi Droppable

Oper. Temp.
(°C)

Smallest Available Pckg.
(mm²)

Price

max w/pins

See Notes

DS18B20-PAR

Local

1-Wire

0.5

Yes

Programmable (NV)

Yes

-55 to +125

$1.76 @1k

See All Temperature Sensors (99)

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

Design Guides

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

Reliability Reports

Request Reliability Report for:

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 Status

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

DS18B20-PAR

Active TO92;3 pin;20 mm²
Outline Drawing: 21-0248 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: Q3-1*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis

DS18B20-PAR/T&R

Active TO92;3 pin;28 mm²
Outline Drawing: 21-0250 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: Q3-4*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis

DS18B20-PAR+T&R

Active TO92;3 pin;28 mm²
Outline Drawing: 21-0250 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: Q3+4*
-40°C to +85°C RoHS/Lead-Free: Lead Free
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

More Like This: View Product Families for Similar Products

See All Temperature Sensors (99 Products)

Didn't Find What You Need?

Next Day Product Selection Assistance from Applications Engineers
Parametric Search
Applications Help

QuickView Technical Documents Ordering Info More Information

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

Related Products
Notes and Comments
Evaluation Kits

2003-11-19
This page last modified: 2008-12-02