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Maxim > Products > Thermal Management > DS1626, DS1726

DS1626, DS1726

High-Precision 3-Wire Digital Thermometer and Thermostat

High-Precision, 3-Wire Digital Thermometers/Thermostats Provide Temperature Measurements and Stand-Alone Thermostat Capability over a -55°C to +125°C Range

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The DS1626 and DS1726 digital thermometers/thermostats provide temperature measurements and stand-alone thermostat capability over a -55°C to +125°C range. The DS1626 offers ±0.5°C accuracy from 0°C to +70°C and the DS1726 has ±1°C accuracy from -10°C to +85°C. The resolution of the measured temperature is user selectable from 9 to 12 bits. Communication with the DS1626 and DS1726 is achieved through a 3-wire serial bus.

The DS1626 and DS1726 offer thermostatic functionality with three dedicated thermostat outputs (T_HIGH, T_LOW, and T_COM), and overtemperature (T_H) and undertemperature (T_L) user-programmable thresholds stored in on-chip EEPROM. For stand-alone thermostat operation, T_H and T_L can be programmed prior to installation, and the DS1626/DS1726 can be configured to automatically begin taking temperature measurements at power-up. Table 1, in the full data sheet, summarizes the user-accessible registers. Figure 1, in the full data sheet, shows a functional diagram.

Data Sheet

Download	Rev 4	(PDF, 148kB)
E-Mail

Key Features

Temperature Measurements Require No External Components
Measure Temperatures from -55°C to +125°C (-67°F to +257°F)
DS1626: ±0.5°C Accuracy from 0°C to +70°C
DS1726: ±1°C Accuracy from -10°C to +85°C
Output Resolution is User Selectable to 9, 10, 11, or 12 Bits
Wide Power-Supply Range (2.7V to 5.5V)
Convert Temperature to Digital Word in 750ms (max)
Stand-Alone Thermostat Capability
Thermostatic Settings are User Definable and Nonvolatile (NV)
Data is Read/Written Through a 3-Wire Serial Interface
Available in 8-Pin µSOP Package

Applications/Uses

Any Space-Constrained Thermally Sensitive Application
Consumer Products
Industrial Controls
Thermostatic Controls

Key Specifications:

Temperature Sensors

Part Number

Sensor Type

Functions

Interface

Accuracy
(±°C)

Parasite Pwr.

Temp. Thresh.

Temp. Resolution
(bits)

Oper. Temp.
(°C)

Smallest Available Pckg.
(mm²)

Budgetary Price

max w/pins

See Notes

DS1626

Local

Dual Output Temperature Switch

Dual Temperature Alarms

Standalone Thermostat

Temperature Switch/Temperature Comparator

3-Wire

Logic

0.5

Programmable (NV)

-55 to +125

16.2

$1.74 @1k

DS1726

$1.69 @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.

Temperature Switches

Part Number

Switch Type

Functions

Interface

Accuracy
(±°C)

Temp. Thresh.
(°C)

Features

Package/Pins

Budgetary Price

See Notes

DS1626

Local

Dual Output Temperature Switch

Dual Temperature Alarms

Standalone Thermostat

Temperature Switch/Temperature Comparator

3-Wire

Logic

0.5

Factory Programmed

Programmable

High Accuracy

Nonvolatile Thermostatic Settings

Push Pull Active High Output

Separate High and Low Temperature Thresholds

µMAX/8

SOIC/8

$1.74 @1k

DS1726

Push Pull Active High Output

Separate High and Low Temperature Thresholds

µMAX/8

$1.69 @1k

See All Temperature Switches (22)

Diagram

Functional Diagram

Application Notes

Application Note 3930		Package Thermal Resistance Values (Theta JA, Theta JC) for Dallas Semiconductor Temperature Sensors
Tutorial 4679		Thermal Management Handbook
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:

DS1626.pdf DS1726.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
DS1626S			Active	SOIC;8 pin;44.1 mm² Outline Drawing:21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8-2*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1626S+			Active	SOIC;8 pin;44.1 mm² Outline Drawing:21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1626S+T&R			Active	SOIC;8 pin;44.1 mm² Outline Drawing:21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1626U			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: No Materials Analysis
DS1626U+			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
DS1626U+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
DS1626U/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: No Materials Analysis
DS1726U			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: No Materials Analysis
DS1726U+			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
DS1726U+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
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1726U/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: No 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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[ 2003-01-29 ]

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Information Index

Rev 4; 2007-07-11
This page last modified: 2009-10-13