EMC1182-1-AIA-TR Datasheet EMC1182-2-AIA-TR, EMC1182-1-AIA-TR, EMC1182-2-AIA | P1-P3

SMSC EMC1182 Revision 1.0 (07-11-13)

DATASHEET

Datasheet

PRODUCT FEATURES

EMC1182

Dual Channel 1°C Temperature Sensor with Beta

Compensation and 1.8V SMBus Communications

General Description

The EMC1182 is a high accuracy, low cost, 1.8V System

Management Bus (SMBus) compatible temperature sensor.

Advanced features such as Resistance Error Correction (REC),

Beta Compensation (to support CPU diodes requiring the

BJT/transistor model including 65nm and lower geometry

processors) and automatic diode type detection combine to

provide a robust solution for complex environmental monitoring

applications. The ability to communicate at 1.8V SMBus levels

provides compatible I/O for the advanced processors found in

today’s tablet and smartphone applications.

The EMC1182 monitors two temperature channels (one

external and one internal), providing ±1°C accuracy for both

external and internal diode temperatures.

REC automatically eliminates the temperature error caused by

series resistance allowing greater flexibility in routing thermal

diodes. Frequency hopping* and analog filters ensure remote

diode traces can be as far as eight (8) inches without degrading

the signal. Beta Compensation eliminates temperature errors

caused by low, variable beta transistors common in today's fine

geometry processors. The automatic beta detection feature

monitors the external diode/transistor and determines the

optimum sensor settings for accurate temperature

measurements regardless of processor technology. This frees

the user from providing unique sensor configurations for each

temperature monitoring application. These advanced features

plus ±1°C measurement accuracy provide a low-cost, highly

flexible and accurate solution for critical temperature monitoring

applications.

Applications

 Notebook Computers

 Desktop Computers

 Industrial

 Embedded applications

Features

 Support for diodes requiring the BJT/transistor model

— Supports 65nm and lower geometry CPU thermal

diodes

 Pin and register compatible with EMC1412

 Automatically determines external diode type and

optimal settings

 Resistance Error Correction

 Frequency hops the remote sample frequency to reject

DC converter and other coherent noise sources*

 Consecutive Alert queue to further reduce false Alerts

 Up to 1 External Temperature Monitor

— 25°C typ, ±1°C max accuracy (20°C < T

DIODE

< 110°C)

— 0.125°C resolution

— Supports up to 2.2nF diode filter capacitor

 Internal Temperature Monitor

— ±1°C accuracy

— 0.125°C resolution

 3.3V Supply Voltage

 1.8V SMBus operation

 Programmable temperature limits for ALERT/THERM2

(85°C default high limit and 0°C default low limit) and

THERM

(85°C default)

 Available in small 8-pin 2mm x 3mm TDFN RoHS

compliant package

 Available in small 8-pin 3mm x 3mm DFN RoHS

compliant package

* Technology covered under the US patent 7,193,543.

CPU / GPU

EMC1182

Host

SMDATA

Thermal

Junction

SMCLK

SMBus

Interface

THERM / ADDR

ALERT / THERM2

Power Control

VDD

GND

VDD = 3.3V

1.8V – 3.3V

1.8V

THERM / ADDR

ALERT / THERM2

Internal

Temp Diode

Switching

Current

Analog

Mux

Internal

Temperature

Digital Mux

Limit Comparator

Low Limit Registers

High Limit Registers

Conversion Rate Register

Interupt Masking

Status Registers

Configuration Register

SMBus Interface

SMCLK

SMDATA

GND

External

Temperature

ΔΣADC

THERM Limit Register

THERM Hysteresis

SMBus Address Decode

EMC1182

Ordering Information:

This product meets the halogen maximum concentration values per IEC61249-2-21

For RoHS compliance and environmental information, please visit www.smsc.com/rohs

Please contact your SMSC sales representative for additional documentation related to this product

such as application notes, anomaly sheets, and design guidelines.

ORDERING NUMBER PACKAGE FEATURES

SMBUS

ADDRESS

EMC1182-A-AC3-TR 8-pin TDFN 2mm x 3mm

(RoHS compliant)

Two temperature sensors, ALERT/THERM2

and THERM

pins, fixed SMBus address

Selectable via

THERM pull-up

EMC1182-1-AIA-TR 8-pin DFN 3mm x 3mm

(RoHS compliant)

Two temperature sensors, ALERT

/THERM2

and THERM pins, fixed SMBus address

1001_100(r/w

)

EMC1182-1-AC3-TR 8-pin TDFN 2mm x 3mm

(RoHS compliant)

Two temperature sensors, ALERT

/THERM2

and THERM pins, fixed SMBus address

1001_100(r/w

)

EMC1182-2-AIA-TR 8-pin DFN 3mm x 3mm

(RoHS compliant)

Two temperature sensors, ALERT

/THERM2

and THERM pins, fixed SMBus address

1001_101(r/w

)

EMC1182-2-AC3-TR 8-pin TDFN 2mm x 3mm

(RoHS compliant)

Two temperature sensors, ALERT

/THERM2

and THERM pins, fixed SMBus address

1001_101(r/w

)

Dual Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications

Datasheet

Revision 1.0 (07-11-13) 2 SMSC EMC1182

DATASHEET

Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for

construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC

reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications

before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent

rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated

version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors

known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not

designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property

damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of

this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered

trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.

The Microchip name and logo, and the Microchip logo are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE

OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL

DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT;

TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD

TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Dual Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications

Datasheet

SMSC EMC1182 3 Revision 1.0 (07-11-13)

DATASHEET

Table of Contents

Chapter 1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Chapter 3 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1 Absolute Maximum Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2 Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3 SMBus Electrical Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Chapter 4 System Management Bus Interface Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1 Communications Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1.1 SMBus Start Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1.2 SMBus Address and RD / WR

Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1.3 THERM

Pin Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.1.5 SMBus Data Bytes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.1.6 SMBus ACK and NACK Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.1.7 SMBus Stop Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.1.8 SMBus Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.1.9 SMBus and I

C Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2 SMBus Protocols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2.1 Write Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2.2 Read Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2.3 Send Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2.4 Receive Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.3 Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Chapter 5 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.1 Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2 Conversion Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.3 Dynamic Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.4 THERM

Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.4.1 THERM

Pin Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.5 ALERT / THERM2 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.5.1 ALERT

/ THERM2 Pin InterruptALERT Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.5.2 ALERT

/ THERM2 Pin ComparatorTHERM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.6 Temperature Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.6.1 Beta Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.6.2 Resistance Error Correction (REC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.6.3 Programmable External Diode Ideality Factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.7 Diode Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.8 Consecutive Alerts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.9 Digital Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.10 Temperature Measurement Results and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Chapter 6 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.1 Data Read Interlock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.2 Temperature Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.3 Status Register 02h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P36 P37-P39 P40-P42 P43-P45 P46-P48

EMC1182-1-AIA-TR

Mfr. #:

Buy EMC1182-1-AIA-TR

Manufacturer:

Microchip Technology

Description:

Board Mount Temperature Sensors 1.8V SMBus Dual Tmp Sensor /w Alerts

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New from this manufacturer.

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