Analog Devices / Maxim Integrated DS18B20 1-Wire Digital Thermometers
Analog Devices DS18B20 Programmable Resolution 1-Wire Digital Thermometers provide 9-bit to 12-bit Celsius temperature measurements with a user-programmable alarm function for upper and lower trigger points. The DS18B20 devices feature a unique 1-wire interface that requires only one data line (and ground) for communication with a central microprocessor.
The thermometers are powered from the data line "parasite power", eliminating the need for an external power supply. Each Analog Devices DS18B20 has a unique 64-bit serial code, so multiple DS18B20s can function on the same 1-Wire bus. This allows one microprocessor to control many DS18B20s distributed over a large area. Typical applications include HVAC environmental controls, temperature monitoring systems inside buildings, equipment, machinery, and process monitoring and control systems.
Features
- Unique 1-wire® interface requires only one port pin for communication
- Reduce component count with integrated temperature sensor and EEPROM
- Measures temperatures from -55°C to +125°C (-67°F to +257°F)
- ±0.5°C Accuracy from -10°C to +85°C
- Programmable resolution from 9-bits to 12-bits
- No external components required
- Parasitic power mode requires only 2 pins for operation (DQ and GND)
- Simplifies distributed temperature-sensing applications with the multidrop capability
- Each device has a unique 64-Bit serial code stored in on-board ROM
- Flexible user-definable Nonvolatile (NV) alarm settings with alarm search command identify devices with temperatures outside
- Programmed limits
- Available in 8-Pin SO (150 mils), 8-Pin μSOP, and 3-Pin TO-92 packages
Applications
- Thermostatic controls
- Industrial systems
- Consumer products
- Thermometers
- Thermally sensitive systems
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