DS18S20

1-Wire Parasite-Power Digital Thermometer


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. 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.
DS18S20: Block Diagram DS18S20: Block Diagram Enlarge+

Key Features

  • Unique 1-Wire® Interface Requires Only One Port Pin for Communication
  • Maximize System Accuracy in Broad Range of Thermal Management Applications
    • 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 Resolution
    • No External Components Required
  • Parasite Power Mode Requires Only 2 Pins for Operation (DQ and GND)
  • Simplifies Distributed Temperature-Sensing Applications with Multidrop Capability
    • Each Device Has a Unique 64-Bit Serial Code Stored in On-Board ROM
  • Flexible User-Definable Nonvolatile (NV) Alarm Settings with Alarm Search Command Identifies Devices with Temperatures Outside Programmed Limits
  • Available in 8-Pin SO (150 mils) and 3-Pin TO-92 Packages

Applications/Uses

  • Consumer Products
  • Industrial Systems
  • Thermally Sensitive Systems
  • Thermometers
  • Thermostatic Controls
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) 9 Yes -55 to +125 $2.09 @1k
See All Temperature Sensors (111)
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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

Reference Schematic 5508 Create a 1-Wire Master with Xilinx PicoBlaze
App Note 5507 Understanding the DS1WM Synthesizable 1-Wire Bus Master
Tutorial 4700 Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing
Tutorial 4699 Overview of Sensor Signal Paths
Tutorial 4679 Thermal Management Handbook
App Note 4600 Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices
Reference Schematic 4477 Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note 4377 Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers
App Note 4277 Getting Started with the MAXQ2000 USB Thumb Evaluation Kit
App Note 4255 How to Power the Extended Features of 1-Wire® Devices
App Note 3930 Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices
App Note 3754 Single-Wire Serial Bus Carries Isolated Power and Data
Tutorial 3620 Temperature-Based Fan Control Using the MAXQ2000 Microcontroller
Reference Schematic 3297 Remote Monitoring System Sends Email via SMS
App Note 2965 1-Wire Master Device Configuration
App Note 2420 1-Wire Communication with a Microchip PICmicro Microcontroller
App Note 1100 White Paper 5: Using 1-Wire APIs for Data Sheet Commands
App Note 1097 White Paper 2: Using the 1-Wire® Public Domain Kit
Reference Schematic 244 Advanced 1-Wire Network Driver
App Note 208 Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor
App Note 192 Using the DS2480B Serial 1-Wire® Line Driver
App Note 187 1-Wire Search Algorithm
App Note 162 Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment
App Note 158 1-Wire® Tagging with XML
Tutorial 148 Guidelines for Reliable Long Line 1-Wire Networks
App Note 126 1-Wire Communication Through Software
App Note 27 Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products

Quality and Environmental Data

Product Reliability Reports: DS18S20.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Temperature Family by Product Type

Tools & Models

DS18S20 IBIS Model

 

Related Resources


MAX31856
Precision Thermocouple to Digital Converter with Linearization

  • Provides High-Accuracy Thermocouple Temperature Readings
  • Internal Cold-Junction Compensation Minimizes System Components
  • ±45V Input Protection Provides Robust System Performance


Type ID PDF Title
Reference Schematic 5508 Create a 1-Wire Master with Xilinx PicoBlaze
App Note 5507 Understanding the DS1WM Synthesizable 1-Wire Bus Master
Tutorial 4700 Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing
Tutorial 4699 Overview of Sensor Signal Paths
Tutorial 4679 Thermal Management Handbook
App Note 4600 Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices
Reference Schematic 4477 Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note 4377 Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers
App Note 4277 Getting Started with the MAXQ2000 USB Thumb Evaluation Kit
App Note 4255 How to Power the Extended Features of 1-Wire® Devices
App Note 3930 Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices
App Note 3754 Single-Wire Serial Bus Carries Isolated Power and Data
Tutorial 3620 Temperature-Based Fan Control Using the MAXQ2000 Microcontroller
Reference Schematic 3297 Remote Monitoring System Sends Email via SMS
App Note 2965 1-Wire Master Device Configuration
App Note 2420 1-Wire Communication with a Microchip PICmicro Microcontroller
App Note 1100 White Paper 5: Using 1-Wire APIs for Data Sheet Commands
App Note 1097 White Paper 2: Using the 1-Wire® Public Domain Kit
Reference Schematic 244 Advanced 1-Wire Network Driver
App Note 208 Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor
App Note 192 Using the DS2480B Serial 1-Wire® Line Driver
App Note 187 1-Wire Search Algorithm
App Note 162 Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment
App Note 158 1-Wire® Tagging with XML
Tutorial 148 Guidelines for Reliable Long Line 1-Wire Networks
App Note 126 1-Wire Communication Through Software
App Note 27 Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products