adt7401rt-reel7 Analog Devices, Inc., adt7401rt-reel7 Datasheet

adt7401rt-reel7

Manufacturer Part Number

adt7401rt-reel7

Description

Smbus/i2c Compatible, ?0.5?c Accurate 12-bit Digital Temperature Sensor With Daisy Chain

Manufacturer

Analog Devices, Inc.

Datasheet

1.ADT7401RT-REEL7.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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adt7401rt-reel7 Summary of contents

Page 1

... The ADT7401 features a one shot mode that reduces the power consumption to 2.57 µW at one sample per second. FUNCTIONAL BLOCK DIAGRAM Figure 1. SOT-23 Functional Block Diagram One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.326.8703 ADT7401 2 C bus where www.analog.com © 2004 Analog Devices, Inc. All rights reserved. ...

Page 2

ADT7401 TABLE OF CONTENTS Specifications..................................................................................... 3 Timing Characteristics..................................................................... 4 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Curves ........................................................... 7 Circuit Information...................................................................... 9 Converter Details.......................................................................... 9 Preliminary Technical Data Application Hints ........................................................................... 10 ...

Page 3

Preliminary Technical Data SPECIFICATIONS All specifications apply for -40°C to +150°C unless otherwise stated. T Table 1. Parameter Min TEMPERATURE SENSOR AND ADC Accuracy @ V = +3.3 V (±10%) DD Accuracy @ (±10%) DD Temperature ...

Page 4

ADT7401 TIMING CHARACTERISTICS Guaranteed by design and characterization, not production tested. The SDA & SCL timing is measured with the input filters turned meet the Fast-Mode I C specification. Switching off the input filters improves ...

Page 5

Preliminary Technical Data ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Rating V to GND –0 Digital Input Voltage to GND –0 Maximum Output Current (OUT) ± Operating Temperature Range –40°C to ...

Page 6

ADT7401 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Description SOT-23 MSOP Pin No. Pin No. Mnemonic SDA 6 1 SCL 5 2 ALERT 4 3 GND ...

Page 7

Preliminary Technical Data TYPICAL PERFORMANCE CURVES Figure 6. Supply Current vs. Supply Voltage @ +25°C Figure 7. Shutdown Current vs. Supply Voltage @ +25°C Figure 8. PSRR vs. Supply Ripple Frequency Figure 9. Temperature Error at 3.3 V and 5 ...

Page 8

ADT7401 Figure 10. Temperature Error vs. Power Supply Noise Frequency Figure 11. Temperature Sensor Response to Thermal Shock Preliminary Technical Data Figure 12. Supply Current vs. Temperature Figure 13. Power Supply Rejection vs. Temperature Rev. PrE | Page 8 of ...

Page 9

Preliminary Technical Data CIRCUIT INFORMATION The ADT7401 is a standalone temperature sensor that generates a 12-bit digital output in two’s complement that varies in direct proportion with the temperature of the device. An onboard sensor generates a voltage precisely proportional ...

Page 10

ADT7401 APPLICATION HINTS THERMAL RESPONSE TIME The time required for a temperature sensor to settle to a specified accuracy is a function of the thermal mass of, and the thermal conductivity between, the sensor and the object being sensed. Thermal ...

Page 11

Preliminary Technical Data OUTLINE DIMENSIONS Figure 16. 6-Lead Plastic Surface Mount SOT-23 RT-6) Dimensions shown in Millimeters Figure 17. 8-Lead Plastic Surface Mount Mini/Micro SOIC (MSOP) (RM-8) Dimensions shown in Millimeters Rev. PrE | Page ADT7401 ...

Page 12

... ADT7401 ORDERING GUIDE Temperature 1 Model Range ADT7401RT- -40°C to +150°C 500REEL7 ADT7401RT-REEL -40°C to +150°C ADT7401RT- -40°C to +150°C REEL7 ADT7401RM- -40°C to +150°C 500REEL7 ADT7401RM- -40°C to +150°C REEL ADT7401RM- -40°C to +150°C REEL7 2 Purchase of licensed I C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the ...

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