DS18B20 Digital Temperature Sensor

The DS18B20 is a digital temperature sensor in a standard TO-92 package, supplied as a two-piece pack. It measures temperatures from -55°C to +125°C with ±0.5°C accuracy across the -10°C to +85°C range, and its resolution is programmable from 9 to 12 bits, giving a finest step of 0.0625°C. Communication uses the 1-Wire bus, which requires only a single data line and ground for a central microprocessor to read the sensor; the 4.7 kΩ pull-up resistor is the only external component needed. Each DS18B20 temperature sensor carries a unique 64-bit serial code stored in on-board ROM, so multiple sensors can share one bus and still be identified individually. The device supports parasitic power mode, drawing power from the data line when the bus is high, which reduces the connection to just two pins (DQ and GND). An alarm function with nonvolatile, user-programmable upper and lower trigger points lets the sensor flag out-of-range temperatures without continuous polling. Typical uses include water tank and liquid temperature measurement, machinery and equipment monitoring, automatic water heaters, and distributed temperature-sensing systems in Arduino, Raspberry Pi, and industrial projects. This DS18B20 digital thermometer is a practical, well-supported sensor for any design that needs reliable digital temperature readings over a simple 1-Wire interface.

1. Water tank, liquid, and reservoir temperature measurement.
2. Machinery, equipment, and enclosure thermal monitoring.
3. Automatic water heaters and temperature-controlled appliances.
4. Distributed temperature-sensing networks using multiple 1-Wire sensors.
5. Arduino, Raspberry Pi, and microcontroller-based temperature projects.
6. Industrial and laboratory systems requiring digital thermometer readings.

1. Model: DS18B20.
2. Package: TO-92, 3-pin.
3. Pack quantity: 2 pieces.
4. Temperature range: -55°C to +125°C.
5. Accuracy: ±0.5°C from -10°C to +85°C.
6. Resolution: programmable 9 to 12 bits (0.0625°C finest step).
7. Supply voltage: 3.0V to 5.5V.
8. Interface: 1-Wire bus (single data line plus ground).
9. Standby power: derived from data line in parasitic mode.
10. Unique 64-bit serial code stored in on-board ROM.
11. Alarm function: nonvolatile user-programmable upper and lower trigger points (TH and TL).
12. Conversion time: 750 ms maximum at 12-bit resolution.
13. External components: none required (4.7 kΩ pull-up resistor recommended).