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1-Wire Parasite-Power Digital Thermometer

Product Details

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.

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
Parametric specs for All Temperature Sensors
Sensor Type Local
# Channels One
Interface 1-Wire
Accuracy (±°C) 0.5
Parasite Pwr. Yes
Temp. Thresh. Programmable (NV)
Temp. Resolution (bits) 9
Oper. Temp. (°C) -55 to +125
Package/Pins SOIC (N)/8
TO92/3
Budgetary
Price (See Notes)
$2.20 @1k
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Simplified Block Diagram

DS18S20: Block Diagram DS18S20: Block Diagram Zoom icon

Technical Docs

Data Sheet 1-Wire Parasite-Power Digital Thermometer Jul 02, 2015
Reference Schematic Create a 1-Wire Master with Xilinx PicoBlaze
App Note Understanding the DS1WM Synthesizable 1-Wire Bus Master
Tutorial Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing
Tutorial Overview of Sensor Signal Paths
Tutorial Thermal Management Handbook
App Note Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices
Reference Schematic Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers
App Note Getting Started with the MAXQ2000 USB Thumb Evaluation Kit
App Note Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices
App Note Single-Wire Serial Bus Carries Isolated Power and Data
Tutorial Temperature-Based Fan Control Using the MAXQ2000 Microcontroller
App Note 1-Wire Master Device Configuration
App Note 1-Wire Communication with a Microchip PICmicro Microcontroller
App Note White Paper 5: Using 1-Wire APIs for Data Sheet Commands
App Note White Paper 2: Using the 1-Wire® Public Domain Kit
Reference Schematic Advanced 1-Wire Network Driver
App Note Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor
App Note Using the DS2480B Serial 1-Wire® Line Driver
App Note 1-Wire Search Algorithm
App Note Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment
App Note 1-Wire® Tagging with XML
Tutorial Guidelines for Reliable Long Line 1-Wire Networks
App Note 1-Wire Communication Through Software
App Note Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products

Design & Development

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Additional Resources
Temperature Family by Product Type
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SIMULATION MODELS

DS18S20 IBIS Model

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Parameters

Parametric specs for All Temperature Sensors
Sensor Type Local
# Channels One
Interface 1-Wire
Accuracy (±°C) 0.5
Parasite Pwr. Yes
Temp. Thresh. Programmable (NV)
Temp. Resolution (bits) 9
Oper. Temp. (°C) -55 to +125
Package/Pins SOIC (N)/8
TO92/3
Budgetary
Price (See Notes)
$2.20 @1k

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

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.

Simplified Block Diagram

DS18S20: Block Diagram DS18S20: Block Diagram Zoom icon

Technical Docs

Data Sheet 1-Wire Parasite-Power Digital Thermometer Jul 02, 2015
Reference Schematic Create a 1-Wire Master with Xilinx PicoBlaze
App Note Understanding the DS1WM Synthesizable 1-Wire Bus Master
Tutorial Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing
Tutorial Overview of Sensor Signal Paths
Tutorial Thermal Management Handbook
App Note Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices
Reference Schematic Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers
App Note Getting Started with the MAXQ2000 USB Thumb Evaluation Kit
App Note Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices
App Note Single-Wire Serial Bus Carries Isolated Power and Data
Tutorial Temperature-Based Fan Control Using the MAXQ2000 Microcontroller
App Note 1-Wire Master Device Configuration
App Note 1-Wire Communication with a Microchip PICmicro Microcontroller
App Note White Paper 5: Using 1-Wire APIs for Data Sheet Commands
App Note White Paper 2: Using the 1-Wire® Public Domain Kit
Reference Schematic Advanced 1-Wire Network Driver
App Note Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor
App Note Using the DS2480B Serial 1-Wire® Line Driver
App Note 1-Wire Search Algorithm
App Note Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment
App Note 1-Wire® Tagging with XML
Tutorial Guidelines for Reliable Long Line 1-Wire Networks
App Note 1-Wire Communication Through Software
App Note Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.