DS18B20 Programmable Resolution 1-Wire Digital Thermometer TO-92 (DS18B20 IC)
The DS18B20 is a high-precision digital thermometer that communicates over a unique 1-Wire bus, requiring only one data line (and ground) for communication with a central microprocessor. Housed in a compact 3-pin TO-92 package, it measures temperatures from -55 degrees Celsius to +125 degrees Celsius. Each sensor has a unique 64-bit serial code laser-burned into it, which allows multiple DS18B20s to function on the same 1-Wire bus, making it ideal for distributed temperature-sensing applications.
This IC is a standard choice in India for IoT projects, smart home systems, and industrial monitoring. It can derive power directly from the data line (parasite power), which eliminates the need for an external power supply. It is frequently used with microcontrollers like Arduino, ESP32, and Raspberry Pi due to its stable digital output and minimal wiring requirements.
Key Features
- 1-Wire Interface: Requires only one port pin for communication.
- Multidrop Capability: Multiple sensors can share the same data bus.
- Programmable Resolution: User-selectable from 9 to 12 bits (0.5 to 0.0625 degree Celsius steps).
- Parasite Power Mode: Can operate with only two pins (DQ and GND).
- Nonvolatile Alarms: User-definable high and low temperature alarm settings (TH and TL).
- Fast Conversion: 12-bit temperature conversion in 750ms (maximum).
- High Accuracy: +/- 0.5 degrees Celsius precision within the range of -10 to +85 degrees Celsius.
Specifications
- IC Type: Digital Thermometer
- Temperature Range: -55 to +125 degrees Celsius
- Accuracy: +/- 0.5 degrees Celsius (from -10 to +85 degrees Celsius)
- Supply Voltage (VDD): 3.0V to 5.5V
- Resolution: 9-bit to 12-bit (Default is 12-bit)
- Unique ID: 64-bit factory-burned serial code
- Package Type: TO-92
- Mounting Type: Through-Hole
- Operating Current: 1.5mA (Max)
Interfaces (Facing Flat Side, Leads Down)
- Pin 1 (GND): Ground
- Pin 2 (DQ): Data Input/Output (Requires a 4.7 kOhm pull-up resistor)
- Pin 3 (VDD): Optional External Power Supply (3.0V to 5.5V)
