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GENERAL DESCRIPTION

This low-voltage (1.7V to 3.7V) digital thermometer and thermostat provides 9, 10, 11, or 12-bit digital temperature readings over a -55°C to +125°C range with ±2°C accuracy over a -25°C to +100°C range. At

power-up, the DS75LX defaults to 9-bit resolution for software compatibility with the LM75. Communication

with the DS75LX is achieved through a simple 2-wire serial interface. Three tri-state address pins allow up to 27 DS75LX devices to operate on the same 2-wire bus, which greatly simplifies distributed temperature sensing applications.

FEATURES

1.7V to 3.7V Operating Range

Tri-State Address Pins Allow Up to 27 Unique Bus Addresses

Temperature Measurements Require No External Components

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

±2°C Accuracy from -25°C to +100°C

Thermometer Resolution Is User Configurable from 9 (Default) to 12 Bits (0.5°C to 0.0625°C Resolution)

9-Bit Conversion Time is 25ms (max)

Thermostatic Settings are User-Definable

Data is Read/Written Through 2-Wire Serial Interface (SDA and SCL Pins)

Data Lines Filtered Internally for Noise Immunity (50ns Deglitch)

Bus Timeout Feature Prevents Lockup Problems on 2-Wire Interface

Multidrop Capability Simplifies Distributed Temperature-Sensing Applications

Pin/Software Compatible with the LM75

Available in 8-Pin μSOP (μMAX?) and SO Packages

APPLICATIONS

Any Thermally Sensitive System

Cellular Base Stations

Telecom Switches and Routers

Servers