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Data Sheet

FULL DATA SHEET (PDF, 188kB) Download   E-Mail

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.

Key Features		Applications/Uses
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		Consumer Products Industrial Systems Thermally Sensitive Systems Thermometers Thermostatic Controls

Application Notes

Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products - DS18S20 Application Note 122: Using Dallas' 1-Wire ICs in 1-Cell Li-Ion Battery Packs With Low-Side N-Channel Safety FETs Master - DS18S20 Application Note 126: 1-Wire Communication Through Software - DS18S20 Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS18S20 Application Note 158: 1-Wire Tagging with XML - DS18S20 Application Note 162: Interfacing the DS18X20/DS1822 1-Wire Temperature Sensor in a Microcontroller Environment - DS18S20 Application Note 187: 1-Wire Search Algorithm - DS18S20 Application Note 192: Using the DS2480B Serial 1-Wire Line Driver - DS18S20 Application Note 208: Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor - DS18S20 Application Note 244: Advanced 1-Wire Network Driver - DS18S20 Application Note 1097: White Paper 2: Using the 1-Wire® Public Domain Kit - DS18S20 Application Note 1100: White Paper 5: Using 1-Wire APIs for Data Sheet Commands - DS18S20 Application Note 2420: 1-Wire Communication with a Microchip PICmicro Microcontroller - DS18S20 Application Note 3297: Remote Monitoring System Sends E-mail via SMS - DS18S20 Application Note 3489: Installing the DS9123O USB Adapter on Windows® 98 - DS18S20 Application Note 3620: Temperature-Based Fan Control Using the MAXQ2000 Microcontroller - DS18S20 Application Note 3930: Package Thermal Resistance Values (Theta JA, Theta JC) for Dallas Semiconductor Temperature Sensors - DS18S20

Evaluation Kits

none

Design Guides

Temp Sensors (PDF) 1-Wire® Products (PDF)

Reliability Reports

Reliability Report: DS18S20.pdf

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: 1-10 of 10
DS18S20	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS18S20Z+T&R			SOIC;8 pin; Dwg: 21-0041 (PDF) Use pkgcode/variation: S8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20Z/T&R			SOIC;8 pin; Dwg: 21-0041 (PDF) Use pkgcode/variation: S8-2*	-55°C to +125°C	See data sheet Materials Analysis
DS18S20Z+			SOIC;8 pin; Dwg: 21-0041 (PDF) Use pkgcode/variation: S8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20+PAR			TO92;3 pin; Dwg: 21-0248 (PDF) Use pkgcode/variation: Q3+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20+			TO92;3 pin; Dwg: 21-0248 (PDF) Use pkgcode/variation: Q3+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20+T&R			TO92;3 pin; Dwg: 21-0250 (PDF) Use pkgcode/variation: Q3+4*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS18S20-SL/T&R			TO92;3 pin; Dwg: 21-0248 (PDF) Use pkgcode/variation: Q3-1*	-55°C to +125°C	See data sheet Materials Analysis
DS18S20-SL+T&R			TO92;3 pin; Dwg: 21-0248 (PDF) Use pkgcode/variation: Q3+1*	-55°C to +125°C	See data sheet Materials Analysis
DS18S20/T&R			TO92;3 pin; Dwg: 21-0250 (PDF) Use pkgcode/variation: Q3-4*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS18S20			TO92;3 pin; Dwg: 21-0248 (PDF) Use pkgcode/variation: Q3-1*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis

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