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050307

DS75LX

Digital Thermometer and Thermostat

with Extended Addressing

www.maxim-ic.com

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.

The DS75LX thermostat has a dedicated open-drain

output (O.S.) and programmable fault tolerance,

which allow the user to define the number of

consecutive error conditions that must occur before

O.S.

is

activated.

There

are

two

thermostatic

operating modes that control thermostat operation

APPLICATIONS

Any Thermally Sensitive System

Cellular Base Stations

Telecom Switches and Routers

Servers

PIN CONFIGURATIONS

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

Packages

ORDERING INFORMATION

PART

TEMP RANGE

PIN

PACKAGE

DS75LXS+

-55°C to +125°C

8 SO

(150 mils)

DS75LXS+T&R

-55°C to +125°C

8 SO

(150 mils),

2500 Piece

DS75LXU+

-55°C to +125°C

8 µSOP

(µMAX)

DS75LXU+T&R

-55°C to +125°C

8 µSOP

(µMAX),

3000 Piece

+ Denotes lead-free package.

T&R denotes tape-and-reel.

Note: A “+” symbol will also be marked on the package near the

pin 1 indicator.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

SO (150 mils)

SCL

GND

O.S.

SDA

6

8

7

5

3

1

2

4

μSOP/μMAX

SCL

GND

O.S.

SDA

6

8

7

5

3

1

2

4