DS75LX Digital Thermometer and Thermostat with Extended Addressing

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±2.0°C Accurate Temperature Sensor with 27 Unique I²C Address Simplifies Distributed Temperature-Sensing Designs

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Data Sheet

FULL DATA SHEET (PDF, 236kB)
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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 based on user-defined trip-points (T_OS and T_HYST).

Key Features Applications/Uses

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

Any Thermally Sensitive System
Cellular Base Stations
Servers
Telecom Switches and Routers

Key Specifications: Temperature Sensors

Part Number

Sensor Type

Interface

Accuracy (±°C)

Parasite Power

Temperature Threshold

Temperature Resolution (Bits)

Multi-Droppable

Features

RoHS Available

Package

Price^**

DS75LX

Local

2-Wire/SMBus

Programmable

10
11
12
9

Yes

•	27 I²C Addresses

•	Low Voltage Operation

•	SMBus Time-Out Prevents SMBus Lockup

•	Separate High and Low Temperature Thresholds

Yes

SOIC/8
uSOP/8

$0.75 @ 1k

See All Temperature Sensors (97)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Evaluation Kits

none

Design Guides

TEMP SENSORS (PDF)

Reliability Reports

Reliability Report: DS75LX.pdf

Software/Models

none

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-4 of 4

DS75LX Free
Sample Buy

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

DS75LXS+T&R
SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+2*
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

DS75LXS+

SOIC;8 pin;
Dwg: 21-0041B (PDF)
Use pkgcode/variation: S8+2*
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

DS75LXU+T&R
uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8+1*
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

DS75LXU+

uMAX;8 pin;
Dwg: 21-0036K (PDF)
Use pkgcode/variation: U8+1*
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

More Information

New Product Press Release 2007-05-21

Related Products

DS75 Digital Thermometer and Thermostat
DS75LV Low-Voltage Digital Temperature Sensor
DS7505 High-Precision Digital Thermometer and Thermostat
DS1775, DS1775R Tiny Digital Thermometer and Thermostat

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Description
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2007-05-03
This page last modified: 2008-05-29