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DESCRIPTION

The DS1825 digital thermometer provides 9 to 12-bit centigrade temperature measurements and has an alarm function with NV user-programmable upper and lower trigger points. The DS1825 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of -55°C to +125°C and is accurate to ±0.5°C over the range of -10°C to +85°C. In addition, the DS1825 can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply.

FEATURES

■ Unique 1-Wire? Interface Requires Only One Port Pin for Communication

■ Each Device has a Unique 64-Bit Serial Code Stored in an On-Board ROM

■ Multidrop Capability Simplifies Distributed Temperature-Sensing Applications

■ 4 Pin-Programmable Bits to Uniquely Identify Up to 16 Sensor Locations on a Bus

■ Requires No External Components

■ Can be Powered from Data Line. Power Supply Range: 3.0V to 3.7V

■ Measures Temperatures from -55°C to +125°C (-67°F to +257°F)

■ ±0.5°C Accuracy from -10°C to +85°C

■ Thermometer Resolution is User-Selectable from 9 to 12 Bits

■ Converts Temperature to 12-Bit Digital Word in 750ms (max)

■ User-Definable (NV) Alarm Settings

■ Alarm Search Command Identifies and Addresses Devices Whose Temperature is Outside of Programmed Limits (Temperature Alarm Condition)

■ Available in 8-Pin μSOP Package

■ Software Compatible with the DS1822

APPLICATIONS

? Thermostatic Controls

? Industrial Systems

? Consumer Products

? Thermometers

? Thermally-Sensitive Systems