MaximDS-18B20

The Maxim Integrated DS18B20 is a digital temperature sensor with a 1-Wire interface, designed for temperature measurement and monitoring in electronics, automation and control systems. It measures from -55 to +125°C, provides ±0.5°C accuracy from -10 to +85°C and offers programmable resolution from 9 to 12 bits.

Technical description

The DS18B20 communicates over a 1-Wire bus, requiring one DQ data line and ground for communication with a microcontroller. Each sensor contains a unique 64-bit serial code stored in ROM, allowing multiple DS18B20 devices to share the same 1-Wire bus while remaining individually addressable. Measurement resolution can be programmed to 9, 10, 11 or 12 bits. Parasite-power operation is also supported, allowing the sensor to derive power from the data line when connected according to the datasheet. The DS18B20 version is available in a 3-pin TO-92 package with GND, DQ and VDD pins.

Typical applications

Suitable for digital thermometers, thermostats, Arduino and other microcontroller platforms, HVAC systems, temperature monitoring in electronic equipment, industrial systems, machinery and applications requiring multiple temperature sensors on a single bus.

Compatibility note

Before replacement or integration, verify the 1-Wire interface, pin configuration and TO-92 package. According to the official TO-92 pinout, Pin 1 is GND, Pin 2 is DQ and Pin 3 is VDD. Parasite-power operation must follow the connection and power requirements specified in the datasheet.

Frequently asked questions

What temperature range does the DS18B20 measure?
The measurement range is -55 to +125°C.

What is its accuracy?
Accuracy is ±0.5°C over the -10 to +85°C range.

Can multiple DS18B20 sensors share the same bus?
Yes. Each DS18B20 has a unique 64-bit serial code, allowing multiple sensors to operate on the same 1-Wire bus.