DS18B20

Programmable Resolution 1-Wire Digital Thermometer

High-Precision Temperature Monitoring with Minimal Connections Ideal for Multisensor Systems


Please check latest availability status for a specific part variant.

Description

The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20 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 DS18B20 can derive power directly from the data line ("parasite power"), eliminating the need for an external power supply.

Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18B20s 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.


How to Spatially Index 1-Wire® Sensors Using the MAXREFDES131 and DS18B20

FAQs: DS18B20 FAQs: DS18B20
DS18B20: Block Diagram DS18B20: Block Diagram Enlarge+

Key Features

  • Unique 1-Wire® Interface Requires Only One Port Pin for Communication
  • Reduce Component Count with Integrated Temperature Sensor and EEPROM
    • Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
    • ±0.5°C Accuracy from -10°C to +85°C
    • Programmable Resolution from 9 Bits to 12 Bits
    • No External Components Required
  • Parasitic 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), 8-Pin µSOP, and 3-Pin TO-92 Packages

Applications/Uses

  • Consumer Products
  • Industrial Systems
  • Thermally Sensitive Systems
  • Thermometers
  • Thermostatic Controls

See parametric specs for Temperature Sensors (113)


Part NumberSensor TypeInterfaceChannelsAccuracy
(±°C)
Parasite Pwr.Temp. Thresh.Temp. Resolution
(bits)
Multi DroppableOper. Temp.
(°C)
Package/PinsBudgetary
Price
See Notes
DS18B20 Local1-WireOne0.5YesProgrammable (NV)
9
10
11
12
Yes-55 to +125
SOIC (N)/8
TO92/3
UMAX/8
$1.97 @1k

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.

DS18B20EVKIT: Evaluation System for the DS18B20
DS18B20EVSYS1: Evaluation System for the DS18B20

Tools & Models

  • DS18B20 IBIS Model
  • Product Reliability Reports: DS18B20.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

    Related Resources


    MAXM86146
    Complete Optical Biosensing Module with Ultra-Low-Power Biometric Sensor Hub

    • Complete Biometric Sensor Hub
    • World-Class Algorithm for Wearable Applications

    MAX31889
    ±0.25°C Accurate I2C Temperature Sensor

    • High Accuracy
    • Long Battery Life
    • Small Size

    MAX31825
    1-Wire® Temperature Sensor with ±1ºC Accuracy

    • 1-Wire Interface Requires Only One Port Pin for Communication
    • Unique 64-bit Serial Code Stored in an On-Board ROM
    • External Resistor Selects Address for Location Identification

    MAX86916
    Integrated Optical Sensor Module for Mobile Health

    • Miniature 3.5mm x 7.0mm x 1.5mm, 14-Pin Optical Module
    • Optical-Grade Glass for Long-Term Optimal and Robust Performance
    • Ultra-Low-Power Operation for Mobile Device

    MAX25205
    Gesture Sensor for Automotive Applications

    • Low-Cost, Flexible Gesture-Sensing Solution for Automotive Applications
    • Low-Power, Low-Cost External CPU Processes Sensor Output
    • Supports Swipe, Rotation, and Proximity Gestures

    MAX86170B
    Best-in-Class Optical Pulse Oximeter and Heart-Rate Sensor AFE for Wearable Health

    • Complete Single-Channel Optical Data Acquisition System
    • Ultra Low-Power Operation for Wearable Devices
    • Excellent Top-End Dynamic Range > 91dB in White Card Loop-Back Test (Nyquist Sample-to-Sample Variance)