DS75LX

Digital Thermometer and Thermostat with Extended Addressing

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

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Status Explanations for product status codes

Active: In Production.

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 (TOS and THYST).

 

Data Sheet

Download this datasheet in PDF formatDownload Rev 0 (PDF, 236kB)
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Key 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/Uses

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

Key Specifications:

Temperature Sensors
Part Number Sensor Type Interface Accuracy
(±°C)
Parasite Pwr. Temp. Thresh. Temp. Resolution
(bits)
Multi Droppable Oper. Temp.
(°C)
Smallest Available Pckg.
(mm2)
Budgetary Price
max w/pins See Notes
DS75LX  Local 2-Wire/I2C/SMBus 2 No Programmable
9
10
11
12
Yes -55 to +125 16.2 $0.75 @1k
See All Temperature Sensors (103)
Pricing 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.


Diagram

DS75LX: Block Diagram
Block Diagram

Application Notes

Tutorial 4679   Thermal Management Handbook

Product Guides

Thermal Management (PDF)

Reliability Reports

Reliability Report: DS75LX.pdf

Software/Models

none

Ordering Information

Filters: Part Number: Package: Temperature: Tape and Reel Sample
Part Number Free
Sample
Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR *
Temp RoHS/Lead-Free?
Materials Analysis
DS75LXS+  
Active SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+2*
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS75LXS+T&R    
Active SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+2*
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS75LXU+  
Active µMAX;8 pin;16.2 mm²
Outline Drawing:21-0036 (PDF)
Land Pattern: 90-0092 (PDF)
Use pkgcode/variation: U8+1*
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis
DS75LXU+T&R    
Active µMAX;8 pin;16.2 mm²
Outline Drawing:21-0036 (PDF)
Land Pattern: 90-0092 (PDF)
Use pkgcode/variation: U8+1*
-55°C to +125°C RoHS/Lead-Free: Lead Free
Materials Analysis

Notes:
  1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
  2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
  3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
  4. * 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.

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More Information

New Product Press Release 2007-05-21 ]


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Information Index

Rev 0; 2007-05-03
This page last modified: 2009-08-19


 


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