Features and Benefits
- 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
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.
- Consumer Products
- Industrial Systems
- Thermally Sensitive Systems
- Thermostatic Controls
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
DS18S20 Reliability Data1/12/2023
1-Wire Search Algorithm3/28/2002
Wirelessly Powering and Accessing a 1-Wire Network3/14/2019
Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices9/25/2009
Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers3/18/2009
Single-Wire Serial Bus Carries Isolated Power and Data3/23/2006
Using Dallas' 1-Wire ICs in 1-Cell Li-Ion Battery Packs With Low-Side N-Channel Safety FETs Master4/25/2001
Overview of Sensor Signal Paths5/12/2010
Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing5/10/2010
Thermal Management Handbook5/4/2010
White Paper 2: Using the 1-Wire® Public Domain Kit7/16/2008
How to Power the Extended Features of 1-Wire® Devices6/17/2008
Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices11/16/2006
Temperature-Based Fan Control Using the MAXQ2000 Microcontroller9/16/2005
1-Wire Master Device Configuration3/3/2004
1-Wire Communication with a Microchip PICmicro Microcontroller9/16/2003
Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor6/20/2002
1-Wire® Tagging with XML6/7/2002
White Paper 5: Using 1-Wire APIs for Data Sheet Commands6/7/2002
1-Wire Communication Through Software5/30/2002
Using the DS2480B Serial 1-Wire® Line Driver3/12/2002
Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment3/8/2002
Minimalist Temperature Control Demo4/24/2001
Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products3/29/2001
Tools & Simulations
DS18S20 Companion Parts
Recommended Related Parts
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