ADT7401 Analog Devices, ADT7401 Datasheet

ADT7401

Manufacturer Part Number

ADT7401

Description

SMBus/I2C Compatible, 0.5 C Accurate 12-Bit Digital Temperature Sensor With Daisy Chainthe ADT7401 is a Complete Temperature Monitoring System That Outputs a 12-bit Digital Word Corresponding to The Temp-erature of The ADT7401 S Silicon. The Device O

Manufacturer

Analog Devices

Datasheet

1.ADT7401.pdf (12 pages)

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Preliminary Technical Data

FEATURES

12-Bit Temperature-to-Digital Converter

±0.5°C Accuracy at 25°C

±1°C Accuracy from 0°C to +70°C

Operation from -40°C to 150°C

Operation from 2.7V to 5.5V

Power Consumption TBD mW Max at 5.5 V

Power Saving One Shot Mode

Pin Selectable Addressing via AS pin

Sub-SMBus/I

Small Low Cost 6-Pin SOT-23 Package and 8-Pin

MSOP

APPLICATIONS

Isolated Sensors

Environmental Control Systems

Refrigeration Systems

Thermal Protection

Industrial Process Control

Power System Monitors

Automotive

Medical

GENERAL DESCRIPTION

The ADT7401 is a complete temperature monitoring system

that outputs a 12-bit digital word corresponding to the temp-

erature of the ADT7401’s silicon. The device offers a high

temperature accuracy of ±1°C from 0°C to +70°C, with

excellent transducer linearity. The digital output of the

ADT7401 is SMBus/I

Rev. PrE

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

C Bus via DC pin

C compatible.

SMBus/I

Figure 1. SOT-23 Functional Block Diagram

FUNCTIONAL BLOCK DIAGRAM

Digital Temperature Sensor with Daisy Chain

Compatible, ±0.5°C Accurate 12-Bit

The ADT7401 is specified for operation at supply voltages from

2.7 V to 5.5 V. Operating at 3.3 V the supply current is typically

230 µA.

The ADT7401 is rated for operation over the -40°C to +150°C

temperature range. It is packaged in a low cost, low area SOT-23

package and mini-SOIC package. The SMBus ALERT pin is an

open-drain output that is used as an out of limit temperature

indicator. It can be wired-AND with other SMBus ALERT pins

and is used in conjunction with the SMBus General Call

Address.

The DC (Daisy Chain) pin creates a sub-SMBus/I

a multiple of ADT7401’s can be used. The DC pin has the

advantage of freeing up the address options on the root bus as

only one ADT7401 root address needs to be used by the

SMBus/I

ADT7401 temperature sensors.

PRODUCT HIGHLIGHTS

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

The ADT7401 has an on-chip temperature sensor that

allows an accurate measurement of the ambient

temperature. The measurable temperature range is -40°C

to +150°C.

Supply voltage of 2.7 V to 5.5 V.

Space-saving 6-lead SOT-23 package and 8-lead MSOP.

Temperature accuracy of ±0.5°C.

0.0625°C temperature resolution.

The ADT7401 features a one shot mode that reduces the

power consumption to 2.57 µW at one sample per second.

C controller but still being able to address a number of

ADT7401

www.analog.com

C bus where

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