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Product Descriptions

The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile user-

programmable upper and lower trigger points. The DS18B20 communicates over a 1-Wire bus that by definition requires only one data line

(and ground) for communication with a central microprocessor. In addition, the DS18B20 can derive power directly from the data line

(“parasite power”), eliminating the need for an external power supply.

Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1-Wire bus. Thus, it is simple to use one

microprocessor to control many DS18B20s distributed over a large area.

Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings,

equipment, or machinery, and process monitoring and control systems.

● Thermostatic Controls

● Industrial Systems

● Consumer Products

● Thermometers

● Thermally Sensitive Systems

● 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 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 Identifies Devices with Temperatures Outside Programmed Limits

● Available in 8-Pin SO (150 mils), 8-Pin μSOP, and 3-Pin TO-92 Packages

DS18B20+

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