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    DS18B20U+ device package

    DS18B20U+ schematic symbol

    Sensors play a very important role in industrial and consumer electronic equipment. They serve as the eyes and ears of any electronic system. There are hundreds of different types of sensors available for a wide range of applications. One of the most widely used type of sensors is the temperature sensor. Temperature measurement is of critical importance in applications like HVAC systems, boiler systems, medical applications, automotives, and industrial control systems. With the advent of IOT (internet of things) the importance of sensors has increased manifold. Sensors play a crucial role in the implementation of any IOT system. In the coming future temperature as well as other sensors are going to be rampantly used in IOT and smart home applications.

    What is DS18B20U+?

    The DS18B20U+ is a digital thermometer or temperature sensor developed by Maxim Integrated. This sensor IC provides temperature reading in 9-bit to 12-bit format. The device features an alarm function with programmable upper and lower trigger points. In order to interface with the microcontroller, the DS18B20U+ requires only 1-wire single communication line. The IC is also capable of deriving power from the communication line which eliminates the need for an external power supply. With each IC having a unique 64-bit serial code, multiple DS18B20U+ ICs can be connected to the same 1-wire bus. In this way, a single microprocessor can be used to control multiple sensors distributed over a large area. These sensors are particularly suitable for HVAC systems, smart homes, machine temperature monitoring, and industrial control applications.

    Pin Configuration

    The pin configuration of the DS18B20U+ thermometer is given in the table below:

    Pin number Pin name Pin description
    1 DQ Data bus connection
    4 GND Ground pin
    8 VDD Supply voltage
    2,3,5,6,7 N.C No connection


    • 1-Wire bus interface
    • Integrated temperature sensor and EEPROM
    • Programmable resolution from 9-bit to 12-bit
    • No external components required
    • Only 2 pins required for parasitic power mode
    • Ideal for distributed temperature sensing applications
    • Unique 64-bit serial code
    • 8-pin uSOP packaging


    The applications of DS18B20U+ temperature sensor IC are provided as following:

    • Thermostatic controls
    • Industrial control systems
    • HVAC systems
    • Thermometers and medical applications
    • Consumer electronic products


    The major technical specifications of the DS18B20U+ thermometer are provided as following:

    • Terminals: 8
    • Package: 8-pin uSOP
    • Input voltage range: -0.5V to 6V
    • Sink current: 4mA
    • Standby current: 750nA
    • Active current: 1mA
    • DQ input current: 5uA
    • Write cycles: 50k
    • Data retention: 10 years
    • Temperature range: -55 to 125 degrees

    How DS18B20U+ work?

    The DS18B20U+ is a digital temperature sensor from Maxim Integrated. This IC requires only 1-Wire data bus line to communicate with the microcontroller. The data output is programmable and can be programmed to 9-bit to 12-bit format. This temperature IC does not require any external components. The DS18B20U+ is also capable of deriving power from the data line which eliminates the need for external power supply.

    A two digit temperature display circuit application is shown in the figure below:

    DS18B20U+ application circuit

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