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DS18S20

1-Wire Parasite-Power Digital Thermometer

Overview

Technical Documents

Ordering Info

Status

Part Number	Status
DS18S20	Active: In Production. See Ordering Information for details.

Description

The DS18S20 digital thermometer provides 9-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18S20 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 DS18S20 can derive power directly from the data line ("parasite power"), eliminating the need for an external power supply.

Each DS18S20 has a unique 64-bit serial code, which allows multiple DS18S20s to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18S20s 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	Rev 4	(PDF, 260kB)
E-Mail

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
9-Bit Thermometer Resolution
Converts Temperature 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)
Applications Include Thermostatic Controls, Industrial Systems, Consumer Products, Thermometers, or Any Thermally Sensitive System

Applications/Uses

Consumer Products
Industrial Systems
Thermally Sensitive Systems
Thermometers
Thermostatic Controls

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)

Budgetary Price

max w/pins

See Notes

DS18S20

Local

1-Wire

0.5

Yes

Programmable (NV)

Yes

-55 to +125

30.9

$2.09 @1k

See All Temperature Sensors (103)

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

Block Diagram

Application Notes

Application Note 27		Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products
Application Note 122		Using Dallas' 1-Wire ICs in 1-Cell Li-Ion Battery Packs With Low-Side N-Channel Safety FETs Master
Application Note 126		1-Wire® Communication Through Software
Tutorial 148		Guidelines for Reliable Long Line 1-Wire® Networks
Application Note 158		1-Wire® Tagging with XML
Application Note 162		Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment
Application Note 187		1-Wire Search Algorithm
Application Note 192		Using the DS2480B Serial 1-Wire® Line Driver
Application Note 208		Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor
Reference Design 244		Advanced 1-Wire Network Driver
Application Note 1097		White Paper 2: Using the 1-Wire® Public Domain Kit
Application Note 1100		White Paper 5: Using 1-Wire APIs for Data Sheet Commands
Application Note 2420		1-Wire® Communication with a Microchip PICmicro Microcontroller
Reference Design 3297		Remote Monitoring System Sends Email via SMS
Tutorial 3620		Temperature-Based Fan Control Using the MAXQ2000 Microcontroller
Application Note 3930		Package Thermal Resistance Values (Theta JA, Theta JC) for Dallas Semiconductor Temperature Sensors
Application Note 4377		Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers
Tutorial 4679		Thermal Management Handbook

Product Guides

1-Wire® Products (PDF)

Thermal Management (PDF)

Reliability Reports

Reliability Report:

DS18S20.pdf

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS18S20		N/A	No Longer Available	DS18S20+	TO92;3 pin;19.5 mm² Outline Drawing:21-0248 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: Q3-1*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS18S20+			Active		TO92;3 pin;19.5 mm² Outline Drawing:21-0248 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: Q3+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20+PAR			Active		TO92;3 pin;19.5 mm² Outline Drawing:21-0248 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: Q3+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20+T&R			Active		TO92;3 pin;27.6 mm² Outline Drawing:21-0250 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: Q3+4*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20-B70		N/A	No Longer Available	DS18S20+	TO92; Land Pattern: Not Available	-55°C to +125°C	See data sheet
DS18S20-C01		N/A	No Longer Available	DS18S20+T&R	TO92; Land Pattern: Not Available	-55°C to +125°C	See data sheet
DS18S20-SL+T&R			Active		TO92;3 pin;19.5 mm² Outline Drawing:21-0248 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: Q3+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20-SL/T&R		N/A	No Longer Available	DS18S20-PAR+T&R	TO92;3 pin;19.5 mm² Outline Drawing:21-0248 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: Q3-1*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS18S20/T&R		N/A	No Longer Available	DS18S20-SL+T&R	TO92;3 pin;27.6 mm² Outline Drawing:21-0250 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: Q3-4*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS18S20Z+			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS18S20Z+T&R			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20Z/T&R			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides 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

Document Ref.: 19-5474 Rev 4; 2010-09-01
This page last modified: 2011-02-15