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DS7505

High-Precision Digital Thermometer and Thermostat

Improved LM75/DS75 Software-Compatible Temperature Sensor Is ±0.5°C Accurate and Has Nonvolatile Thermostat Thresholds

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The DS7505 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 ±0.5°C accuracy over a -0°C to +70°C range. A 9-bit resolution mode is software compatible with the LM75. Communication with the DS7505 is achieved through a simple 2-wire serial interface. Three address pins allow up to eight DS7505 devices to operate on the same 2-wire bus, which greatly simplifies distributed temperature-sensing applications.

The DS7505 thermostat has a dedicated open-drain output (O.S.) and programmable fault tolerance, which allows 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) that are stored in EEPROM registers.

Data Sheet

Download	Rev 1	(PDF, 204kB)
E-Mail

Key Features

Operating Range from 1.7V to 3.7V
Temperature Measurements Require No External Components
Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
±0.5°C Accuracy Over a 0°C to +70°C Range
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 and Nonvolatile (NV)
Stand-Alone Thermostat Capability
Data Read/Write Occurs Through a 2-Wire Serial Interface (SDA and SCL Pins)
Data Lines Filtered Internally for Noise Immunity (50ns Deglitch)
Optional 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 SO and µMAX® Packages

Applications/Uses

Any Thermally Sensitive System
Cellular Base Stations
Medical Equipment
Networking Equipment
Office Equipment

Key Specifications:

Temperature Sensors

Part Number

Sensor Type

Functions

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

DS7505

Local

Standalone Thermostat

2-Wire/I²C/SMBus

0.5

Programmable (NV)

Yes

-55 to +125

16.2

$1.40 @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

Block Diagram

Application Notes

Tutorial 4679		Thermal Management Handbook
Tutorial 4685		How Continuous Positive Airway Pressure (CPAP) Respiratory Ventilation Systems Function
Tutorial 4699		Overview of Sensor Signal Paths
Tutorial 4700		Introduction to Medical Instruments and Growing Trend for Point-of-Care and Near-Patient Testing

Product Guides

Thermal Management (PDF)

Reliability Reports

Reliability Report:

DS7505.pdf

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS7505S+			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
DS7505S+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
DS7505U+			Active	µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+3*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS7505U+T&R			Active	µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+3*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

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More Information

New Product Press Release

[ 2008-07-24 ]

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Rev 1; 2008-04-03
This page last modified: 2009-07-31