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DS18S20

1-Wire Parasite-Power Digital Thermometer

Overview

Design Resources

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)
Email

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)

Budgetary
Price

See Notes

DS18S20

Local

1-Wire

0.5

Yes

Programmable (NV)

Yes

-55 to +125

$2.16 @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

Block Diagram

Technical Documents

App Note 27 Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products

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 1097 White Paper 2: Using the 1-Wire® Public Domain Kit

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

Reference Schematic 3297 Remote Monitoring System Sends Email via SMS

Tutorial 3620 Temperature-Based Fan Control Using the MAXQ2000 Microcontroller

App Note 3930 Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices

App Note 4377 Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers

Tutorial 4679 Thermal Management Handbook

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:

DS18S20.pdf

Software/Models

DS18S20 IBIS Model

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 Package Details	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS18S20+			Active		TO92;3 pin;19.5 mm² Package Details	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20+PAR			Active		TO92;3 pin;19.5 mm² Package Details	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20+T&R			Active		TO92;3 pin;27.6 mm² Package Details	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20-SL+T&R			Active		TO92;3 pin;19.5 mm² Package Details	-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 Package Details	-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 Package Details	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS18S20Z+			Active		SOIC(N);8 pin;30.9 mm² Package Details	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20Z+T&R			Active		SOIC(N);8 pin;30.9 mm² Package Details	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20Z/T&R			Active		SOIC(N);8 pin;30.9 mm² Package Details	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maximintegrated.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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More Information

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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

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