The DS18B20 is a highly popular, programmable 1-Wire digital temperature sensor manufactured in a compact TO-92 transistor-style package. It provides highly accurate Celsius temperature readings directly to a microcontroller without needing an analog-to-digital converter.Key Specifications

• Communication Interface: Analog Devices 1-Wire protocol, which requires only a single digital pin for communication.
• Temperature Range: Measures from -55C to +125C.
• Accuracy: 0.5C precision within the critical range of -10C to +85C.
• Operating Voltage: 3.0V to 5.5V, making it fully compatible with both 3.3V and 5V microcontrollers.
• Configurable Resolution: User-programmable from 9-bit to 12-bit precision.
• Unique ROM ID: Every individual chip has a unique, factory-etched 64-bit serial code, enabling multiple sensors to reside on the same single data wire.

TO-92 Pinout ConfigurationWhen looking at the flat side of the TO-92 package with the leads pointing downward, the pins from left to right are:

1. GND (Pin 1): Connects to the system ground.
2. DQ / DATA (Pin 2): The data input/output pin. It requires a 4.7k pull-up resistor connected between this pin and the power supply line (VDD) for reliable communication.
3. VDD (Pin 3): Power supply pin. Alternatively, the sensor supports parasitic power mode, where it derives power directly from the data line, allowing operation using only two pins (GND and DQ).