The 1-Wire bus protocol, which is utilized by the DS18B20, only needs one control signal for communication. To avoid the bus port being in a 3-state or high-impedance condition, the control signal line needs a wake-up pull-up resistor (the DQ signal line is on the DS18B20). The microcontroller (master device) in this bus system recognizes the bus's devices by their 64-bit serial numbers. A bus may potentially support a limitless number of devices because each one has a distinct serial number.
The DS18B20 is a popular digital temperature sensor with the features of small size, minimal hardware overhead, strong anti-interference capabilities, and high precision. It outputs digital signals. The DS18B20 digital temperature sensor is simple to wire and is packaged in a variety of ways, including pipeline, screw, magnet adsorption, stainless steel, and numerous model options.
The temperature readings from the DS18B20 temperature sensor are 9-bit (binary), suggesting that the device's temperature data is either sent to the DS18B20 temperature sensor via the single-line interface or that it is sent out from the DS18B20 temperature sensor. As a result, just one line (plus ground) is required to connect the host CPU to the DS18B20 temperature sensor, and the data line itself can act as the sensor's power source in place of an external power source.
The DS18B20 temperature sensor uses a DS18B20 chip, has a working temperature range of -55°C to +105°C, a temperature accuracy of -10°C to +80°C, and an error of 0.5°C; it is made of three-core sheathed wire conductor and is packaged using epoxy resin perfusion.