Analog Devices DS18B20+ Digital Temperature Sensor IC, TO-92 3-Pin

The 1-Wire interface is a proprietary single-wire communication protocol developed by Maxim Integrated (now part of Analog Devices). To connect the DS18B20+, link its data pin (DQ) to a digital GPIO on your microcontroller (Arduino, Raspberry Pi, etc.), connect VDD to a 3.0V-5.5V supply, and GND to ground. A 4.7kΩ pull-up resistor is required between the data line and VDD for reliable communication. Libraries like DallasTemperature for Arduino simplify reading the digital temperature values.

The DS18B20+ operates from a supply voltage of 3.0V to 5.5V. Yes, it supports parasitic power mode, where it draws power directly from the data line during strong pull-up phases, eliminating the need for a separate VDD connection. For reliable operation in parasitic mode, ensure your microcontroller can provide a strong pull-up on the data line and follow the timing requirements specified in the datasheet, especially during temperature conversion.

The DS18B20+ offers a typical accuracy of ±0.5°C within the -10°C to +85°C range. Its resolution is programmable from 9 to 12 bits, corresponding to temperature increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C, respectively. Higher resolution provides finer measurement granularity but increases the conversion time from 93.75ms (9-bit) to 750ms (12-bit). You can configure this trade-off in your system firmware.

Theoretically, you can connect many sensors on a single bus, limited by the network's electrical characteristics and the microcontroller's ability to handle the unique 64-bit ROM codes. Each DS18B20+ has a factory-lasered unique 64-bit serial number, allowing the master microcontroller to address each sensor individually. This enables robust multi-point temperature monitoring systems for applications like server racks, greenhouses, or industrial machinery with minimal wiring.