Microchip Technology EMC1403, EMC1404 Data Sheet

EMC1403/EMC1404

1°C Temperature Sensor with Beta Compensation

PRODUCT FEATURES

General Description

The EMC1403 and EMC1404 are high accuracy, low
cost, System Management Bus (SMBus) temperature
sensors. Advanced features such as Resistance Error
Correction (REC), Beta Compensation (to support CPU
diodes requiring the BJT/transistor model including
45nm, 65nm and 90nm processors) and automatic
diode type detection combine to provide a robust
solution for complex environmental monitoring
applications.

Each device provides ±1° accuracy for external diode
temperatures and ±2°C accuracy for the internal diode
temperature. The EMC1403 monitors three temperature
channels (two external and one internal). The EMC1404
monitors four temperature channels (three external and
one internal).

Resistance Error Correction automatically eliminates the
temperature error caused by series resistance allowing
greater flexibility in routing thermal diodes. Beta
Compensation eliminates temperature errors caused by
low, variable beta transistors common in today's fine
geometry processors. The automatic beta detection
feature monitors each 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.

Data Sheet

Applications

 Notebook Computers
 Desktop Computers
 Industrial
 Embedded applications

Features

 Support for diodes requiring the BJT/transistor model

— supports 45nm, 65nm, and 90nm CPU thermal diodes.

 Automatically determines external diode type and

optimal settings

 Resistance Error Correction
 External Temperature Monitors

— ±1°C Accuracy (60°C < T
— 0.125°C Resolution
— Anti-parallel diodes for extra diode support

 Internal Temperature Monitor

— ±2°C accuracy

 3.3V Supply Voltage
 Programmable temperature limits for ALERT and

THERM

 Available in these RoHS Compliant Packages

— 10-pin 3mm x 3mm DFN
— 10-pin MSOP
— 14-pin SOIC

DIODE

< 100°C)

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1°C Temperature Sensor with Beta Compensation

Ordering Information:

EMC1403-1-AIZL-TR for 10-pin, MSOP RoHS Compliant Package
EMC1403-2-AIZL-TR for 10-pin, MSOP RoHS Compliant Package
EMC1403-3-AIZL-TR for 10-pin, MSOP RoHS Compliant Package
EMC1403-4-AIZL-TR for 10-pin, MSOP RoHS Compliant Package

EMC1403-1-AIA-TR for 10-pin, DFN RoHS Compliant Package
EMC1403-2-AIA-TR for 10-pin, DFN RoHS Compliant Package
EMC1403-3-AIA-TR for 10-pin, DFN RoHS Compliant Package
EMC1403-4-AIA-TR for 10-pin, DFN RoHS Compliant Package

EMC1403-1-YZT-TR for 14-pin, SOIC RoHS Compliant Package

EMC1403-2-YZt-TR for 14-pin, SOIC RoHS Compliant Package
EMC1403-3-YZt-TR for 14-pin, SOIC RoHS Compliant Package

EMC1403-4-YZt-TR for 14-pin, SOIC RoHS Compliant Package
EMC1404-1-AIZL-TR for 10-pin, MSOP RoHS Compliant Package
EMC1404-2-AIZL-TR for 10-pin, MSOP RoHS Compliant Package
EMC1404-3-AIZL-TR for 10-pin, MSOP RoHS Compliant Package
EMC1404-4-AIZL-TR for 10-pin, MSOP RoHS Compliant Package

Note: See Table 1.1, "Part Selection" for SMBus addressing options.

REEL SIZE IS 4,000 PIECES.

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

Data Sheet

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The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).

Errata

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DS20005272A-page 2  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Table of Contents

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

1.1 Part Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 2 Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 3 Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.3 SMBus Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Chapter 4 System Management Bus Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.1 System Management Bus Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.2 Write Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.3 Read Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.4 Send Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.5 Receive Byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.6 Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.7 SMBus Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.8 SMBus Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Chapter 5 Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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

5.1.1 Conversion Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.1.2 Dynamic Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2 THERM Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.3 ALERT Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.3.1 ALERT Pin Interrupt Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.3.2 ALERT Pin Comparator Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.4 Beta Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

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

5.6 Programmable External Diode Ideality Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.7 Diode Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

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

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

5.10 Temperature Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.11 Temperature Measurement Results and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5.12 Anti-parallel Diode Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.13 External Diode Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Chapter 6 Register Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.1 Data Read Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6.2 Temperature Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6.3 Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

6.4 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

6.5 Conversion Rate Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

6.6 Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

6.7 Scratchpad Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

6.8 One Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

6.9 Therm Limit Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

6.10 External Diode Fault Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

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1°C Temperature Sensor with Beta Compensation

Data Sheet

6.11 Channel Mask Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.12 Consecutive ALERT Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

6.13 Beta Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

6.14 External Diode Ideality Factor Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

6.15 High Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

6.16 Low Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

6.17 THERM Limit Status Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

6.18 Filter Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

6.19 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

6.20 Microchip ID Register (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

6.21 Revision Register (FFh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Chapter 7 Typical Operating Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Chapter 8 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

8.1 Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

8.1.1 EMC1404-X-AIZL (10-pin MSOP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

8.1.2 EMC1403-X-AIZL (10-pin MSOP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

8.1.3 EMC1403-1-AIA and EMC1403-2-AIA (10-pin DFN). . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

8.1.4 EMC1403-YZT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Chapter 9 Data Sheet Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

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1°C Temperature Sensor with Beta Compensation

Data Sheet

List of Figures

Figure 1.1 EMC1403/EMC1404 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 2.1 EMC1403/EMC1404 Pin Diagram, MSOP-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 2.2 EMC1403/EMC1404 Pin Diagram, DFN-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 2.3 EMC1403/EMC1404 Pin Diagram, SOIC-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 4.1 SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 5.1 System Diagram for EMC1403 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 5.2 System Diagram for EMC1404 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 5.3 Temperature Filter Step Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 5.4 Temperature Filter Impulse Response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 5.5 Block Diagram of Temperature Monitoring Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 5.6 Diode Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 8.1 10-Pin MSOP / TSSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Figure 8.2 10-Pin DFN Package Drawing (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Figure 8.3 10-Pin DFN Package Dimensions (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 8.4 Package Drawing and PCB Footprint for SOIC-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

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1°C Temperature Sensor with Beta Compensation

Data Sheet

List of Tables

Table 1.1 Part Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 2.1 EMC1403 and EMC1404 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 3.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 3.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 3.3 SMBus Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 4.1 Protocol Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 4.2 Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 4.3 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 4.4 Send Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 4.5 Receive Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 4.6 Alert Response Address Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 5.1 Supply Current vs. Conversion Rate for EMC1403 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 5.2 Supply Current vs. Conversion Rate for EMC1404 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 5.3 Temperature Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 6.1 Register Set in Hexadecimal Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Table 6.2 Temperature Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table 6.3 Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Table 6.4 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Table 6.5 Conversion Rate Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Table 6.6 Conversion Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 6.7 Temperature Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 6.8 Scratchpad Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 6.9 One Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 6.10 Therm Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 6.11 External Diode Fault Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 6.12 Channel Mask Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 6.13 Consecutive ALERT Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 6.14 Consecutive Alert / THERM Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Table 6.15 Beta Configuration Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Table 6.16 CPU Beta Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Table 6.17 Ideality Configuration Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Table 6.18 Ideality Factor Look-Up Table (Diode Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 6.19 Substrate Diode Ideality Factor Look-Up Table (BJT Model) . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 6.20 High Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Table 6.21 Low Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Table 6.22 THERM Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 6.23 Filter Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 6.24 Filter Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Table 6.25 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Table 6.26 Manufacturer ID Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Table 6.27 Revision Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Table 9.1 Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

. . 42

DS20005272A-page 6  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Chapter 1 Block Diagram

Figure 1.1 EMC1403/EMC1404 Block Diagram

1.1 Part Selection

The EMC1403 and EMC1404 device configuration is highlighted below.

PART

NUMBER

EMC1403 - 1 -

AIZL

EMC1403 - 2 -

AIZL

EMC1403 - 3 -

AIZL

EMC1403 - 4 -

AIZL

SMBUS

ADDRESS

1001_100xb

1001_101xb

0011_000xb

0101_001xb

EXTERNAL

DIODES

Table 1.1 Part Selection

FUNCTIONALITY

DIODE 1

DEFAULT

CONFIGURATION

2

Detect Diode w/ REC

enabled

DIODE 2

DEFAULT

CONFIGURATION OTHER

Software program-

mable and mas-

Detect Diode w/ REC

enabled

kable High Limits

Software program-

mable THERM

Limits

PRODUCT

ID

21h

 2014 Microchip Technology Inc. DS20005272A-page 7

1°C Temperature Sensor with Beta Compensation

Table 1.1 Part Selection (continued)

FUNCTIONALITY

Data Sheet

PART

NUMBER

EMC1403 - 1 -

AIA

EMC1403 - 2 -

AIA

EMC1403 - 3 -

AIA

EMC1403 - 4 -

AIA

EMC1403 - 1 -

YZT

EMC1403 - 2 -

YZT

EMC1403 - 3 -

YZT

EMC1403 - 4 -

YZT

EMC1404 - 1 1001_100xb

EMC1404 - 2 1001_101xb

EMC1404 - 3 0011_000xb

EMC1404 - 4 0101_001xb

SMBUS

ADDRESS

1001_100xb

1001_101xb

0011_000xb

0101_001xb

1001_100xb

1001_101xb

0011_000xb

0101_001xb

EXTERNAL

DIODES

2

2

3

DIODE 1

DEFAULT

CONFIGURATION

Detect Diode w/ REC

enabled

Detect Diode w/ REC

enabled

Detect Diode w/ REC

enabled

DIODE 2

DEFAULT

CONFIGURATION OTHER

Software program-

mable and mas-

Detect Diode w/ REC

enabled

Detect Diode w/ REC

enabled

Fixed 2N3904 in anti­parallel diode configu-

ration

Note 1.1

kable High Limits

Software program-

mable THERM

Limits

Software program-

mable and mas-

kable High Limits

Software program-

mable THERM

Limits

Software program-

mable and mas-

kable High Limits

Software program-

mable THERM

Limits

PRODUCT

ID

21h

21h

25h

Note 1.1 External 2 and external 3 channels have beta configuration hard wired to ‘0111b’ and REC

enabled.

DS20005272A-page 8  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Chapter 2 Pin Description

Figure 2.1 EMC1403/EMC1404 Pin Diagram, MSOP-10

Figure 2.2 EMC1403/EMC1404 Pin Diagram, DFN-10

Figure 2.3 EMC1403/EMC1404 Pin Diagram, SOIC-14

 2014 Microchip Technology Inc. DS20005272A-page 9

Table 2.1 EMC1403 and EMC1404 Pin Description

1°C Temperature Sensor with Beta Compensation

Data Sheet

PIN

NUMBER

10-PIN

PIN

NUMBER

14-PIN NAME FUNCTION TYPE

n/a 1 n/c Not Internally Connected n/a

1 2 VDD Power supply Power

23

34

DP1 External diode 1 positive (anode)

connection

DN1 External diode 1 negative (cathode)

connection

DP2 / DN3 External diode 2 positive (anode)

45

connection / External Diode 3
negative (cathode) connection for
anti-parallel diodes

DN2 / DP3 External diode 2 negative (cathode)

56

connection / External Diode 3
positive (anode) connection for anti­parallel diodes

n/a 7 n/c Not Internally Connected n/a

n/a 8 n/c Not Internally Connected n/a

6 9 GND Ground Power

710

THERM Critical THERM output signal -

requires pull-up resistor

AIO

AIO

AIO

AIO

OD (5V)

811

912

10 13

ALERT Active low digital ALERT output

SMDATA SMBus Data input/output - requires

SMCLK SMBus Clock input - requires pull-up

signal - requires pull-up resistor

pull-up resistor

resistor

OD (5V)

DIOD (5V)

DI (5V)

n/a 14 n/c Not Internally Connected n/a

DFN

Bottom

n/a

Exposed Pad Not Internally Connected,

recommend grounding.

n/a

Pad

APPLICATION NOTE: For the 5V tolerant pins that have a pull-up resistor (SMCLK, SMDATA, THERM, and

ALERT), the voltage difference between VDD and the pull-up voltage must never exceed

3.6V.

The pin types are described below:

Power - these pins are used to supply either VDD or GND to the device.

AIO - Analog Input / Output.

DI - Digital Input.

OD - Open Drain Digital Output.

DIOD - Digital Input / Open Drain Output.

DS20005272A-page 10  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Chapter 3 Electrical Specifications

3.1 Absolute Maximum Ratings

Table 3.1 Absolute Maximum Ratings

DESCRIPTION RATING UNIT

Supply Voltage (V

Voltage on 5V tolerant pins (V

Voltage on 5V tolerant pins (|V

Voltage on any other pin to Ground -0.3 to V

) -0.3 to 4.0 V

DD

) -0.3 to 5.5 V

5VT_pin

- VDD|) (see Note 3.1) -0.3 to 3.6 V

5VT_pin

+0.3 V

DD

Operating Temperature Range -40 to +125 °C

Storage Temperature Range -55 to +150 °C

Lead Temperature Range Refer to JEDEC Spec. J-STD-020

Package Thermal Characteristics for MSOP-10

Thermal Resistance (

) 132.2 °C/W

j-a

Package Thermal Characteristics for SOIC-14

Thermal Resistance (

) 77.7 °C/W

j-a

Package Thermal Characteristics for DFN-10

Thermal Resistance (

) 77.1 °C/W

j-a

ESD Rating, All pins HBM 2000 V

Note: Stresses at or above those listed could cause permanent damage to the device. This is a stress

rating only and functional operation of the device at any other condition above those indicated
in the operation sections of this specification is not implied. When powering this device from
laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be
exceeded or device failure can result. Some power supplies exhibit voltage spikes on their
outputs when the AC power is switched on or off. In addition, voltage transients on the AC
power line may appear on the DC output. If this possibility exists, it is suggested that a clamp
circuit be used.

Note 3.1 For the 5V tolerant pins that have a pull-up resistor (SMCLK, SMDATA,

THERM, and

ALERT), the pull-up voltage must not exceed 3.6V when the device is unpowered.

 2014 Microchip Technology Inc. DS20005272A-page 11

1°C Temperature Sensor with Beta Compensation

3.2 Electrical Specifications

Table 3.2 Electrical Specifications

V

= 3.0V to 3.6V, TA = -40°C to 125°C, all typical values at TA = 27°C unless otherwise noted.

DD

CHARACTERISTIC SYMBOL MIN TYP MAX UNITS CONDITIONS

DC Power

Data Sheet

Supply Voltage V

Supply Current I

DD

DD

3.0 3.3 3.6 V

430 850 uA 1 conversion / sec, dynamic

averaging disabled

930 1200 uA 4 conversions / sec, dynamic

averaging enabled

1120 uA

> 16 conversions / sec, dynamic
averaging enabled

Standby Supply Current I

DD

170 230 uA Device in Standby mode, no SMBus

communications, ALERT and
THERM pins not asserted.

Internal Temperature Monitor

Temperature Accuracy ±0.25 ±1 °C -5°C < T

±2 °C -40°C < T

Temperature Resolution 0.125 °C

External Temperature Monitor

Temperature Accuracy ±0.25 ±1 °C +20°C < T

0°C < TA < 100°C

±0.5 ±2 °C -40°C < T

Temperature Resolution 0.125 °C

< 100°C

A

< 125°C

A

DIODE

DIODE

< +110°C

< 127°C

Capacitive Filter C

t

CONV

t

CONV

FILTER

190 ms EMC1403, default settings

150 ms EMC1404, default settings

2.2 2.5 nF Connected across external diode

ALERT and THERM pins

Output Low Voltage V

Leakage Current I

OL

LEAK

0.4 V I

±5 uA ALERT and THERM pins

= 8mA

SINK

Device powered or unpowered
TA < 85°C
pull-up voltage < 3.6V

DS20005272A-page 12  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

3.3 SMBus Electrical Characteristics

Table 3.3 SMBus Electrical Specifications

V

= 3.0V to 3.6V, TA = -40°C to 125°C, all typical values are at TA = 27°C unless otherwise noted.

DD

CHARACTERISTIC SYMBOL MIN TYP MAX UNITS CONDITIONS

SMBus Interface

Input High Voltage V

Input Low Voltage V

Input High/Low Current I

IH

IL

IH / IIL

2.0 V

V 5V Tolerant

DD

-0.3 0.8 V 5V Tolerant

±5 uA Powered or unpowered

Hysteresis 420 mV

Input Capacitance C

Output Low Sink Current I

OL

IN

8.2 15 mA SMDATA = 0.4V

5pF

SMBus Timing

Clock Frequency f

Spike Suppression t

Bus free time Start to
Stop

Hold Time: Start t

Setup Time: Start t

Setup Time: Stop t

Data Hold Time t

Data Hold Time t

Data Setup Time t

Clock Low Period t

Clock High Period t

Clock/Data Fall time t

Clock/Data Rise time t

Capacitive Load C

SMB

SP

t

BUF

HD:STA

SU:STA

SU:STP

HD:DAT

HD:DAT

SU:DAT

LOW

HIGH

FALL

RISE

LOAD

10 400 kHz

50 ns

1.3 us

0.6 us

0.6 us

0.6 us

0 us When transmitting to the master

0.3 us When receiving from the master

100 ns

1.3 us

0.6 us

300 ns Min = 20+0.1C

300 ns Min = 20+0.1C

400 pF per bus line

TA < 85°C

LOAD

LOAD

ns

ns

 2014 Microchip Technology Inc. DS20005272A-page 13

1°C Temperature Sensor with Beta Compensation

Data Sheet

Chapter 4 System Management Bus Interface Protocol

4.1 System Management Bus Interface Protocol

The EMC1403 and EMC1404 communicate with a host controller, such as an SIO, through the SMBus.
The SMBus is a two-wire serial communication protocol between a computer host and its peripheral
devices. A detailed timing diagram is shown in

For the first 15ms after power-up the device may not respond to SMBus communications.

.

Figure 4.1.

Figure 4.1 SMBus Timing Diagram

The EMC1403 and EMC1404 are SMBus 2.0 compatible and support Send Byte, Read Byte, Write
Byte, Receive Byte, and the Alert Response Address as valid protocols as shown below.

All of the below protocols use the convention in Table 4.1.

Table 4.1 Protocol Format

DATA SENT

TO DEVICE

# of bits sent # of bits sent

Attempting to communicate with the EMC1403 and EMC1404 SMBus interface with an invalid slave
address or invalid protocol will result in no response from the device and will not affect its register
contents. Stretching of the SMCLK signal is supported, provided other devices on the SMBus control
the timing.

DATA SENT TO

THE HOST

DS20005272A-page 14  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

4.2 Write Byte

The Write Byte is used to write one byte of data to the registers as shown below Table 4.2:

Table 4.2 Write Byte Protocol

START

SLAVE

ADDRESS WR

ACK

REGISTER
ADDRESS ACK

REGISTER

DATA ACK STOP

1 -> 0 1001_100 0 0 XXh 0 XXh 0 0 -> 1

4.3 Read Byte

The Read Byte protocol is used to read one byte of data from the registers as shown in Table 4.3.

Table 4.3 Read Byte Protocol

START SLAVE

ADDRESS

WR ACK REGISTER

ADDRESS

ACK START SLAVE

ADDRESS

RD ACK REGISTER

DATA

NACK STOP

1 -> 0 1001_100 0 1 XXh 0 1 -> 0 1001_100 1 1 XX 1 0 -> 1

4.4 Send Byte

The Send Byte protocol is used to set the internal address register pointer to the correct address

START

location. No data is transferred during the Send Byte protocol as shown in

Table 4.4 Send Byte Protocol

SLAVE

ADDRESS WR

ACK

REGISTER
ADDRESS ACK STOP

Table 4.4.

1 -> 0 1001_100 0 0 XXh 0 0 -> 1

4.5 Receive Byte

The Receive Byte protocol is used to read data from a register when the internal register address
pointer is known to be at the right location (e.g. set via Send Byte). This is used for consecutive reads
of the same register as shown in

SLAVE

START

ADDRESS RD

1 -> 0 1001_100 1 0 XXh 1 0 -> 1

 2014 Microchip Technology Inc. DS20005272A-page 15

Table 4.5.

Table 4.5 Receive Byte Protocol

ACK REGISTER DATA NACK STOP

4.6 Alert Response Address

The ALERT output can be used as a processor interrupt or as an SMBus Alert.

When it detects that the ALERT pin is asserted, the host will send the Alert Response Address (ARA)
to the general address of 0001_100xb. All devices with active interrupts will respond with their client
address as shown in

Table 4.6.

Table 4.6 Alert Response Address Protocol

1°C Temperature Sensor with Beta Compensation

Data Sheet

ALERT

START

1 -> 0 0001_100 1 0 1001_1000 1 0 -> 1

APPLICATION NOTE: The ARA does not clear the Status Register and if the MASK bit is cleared prior to the Status

RESPONSE

ADDRESS RD

The EMC1403 and EMC1404 will respond to the ARA in the following way:

1. Send Slave Address and verify that full slave address was sent (i.e. the SMBus communication
from the device was not prematurely stopped due to a bus contention event).

2. Set the MASK bit to clear the ALERT pin.

Register being cleared, the

ACK

ALERT pin will be reasserted.

DEVICE

ADDRESS NACK STOP

4.7 SMBus Address

The EMC1403 and EMC1404 respond to hard-wired SMBus slave address as shown in Table 1.1.

Note: Other addresses are available. Contact Microchip for more information.

4.8 SMBus Timeout

The EMC1403 and EMC1404 support SMBus Timeout. If the clock line is held low for longer than
30ms, the device will reset its SMBus protocol. This function can be enabled by setting the TIMEOUT
bit in the Consecutive Alert Register (see

Section 6.12).

DS20005272A-page 16  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Chapter 5 Product Description

The EMC1403 and EMC1404 are SMBus temperature sensors. The EMC1403 monitors one internal
diode and two externally connected temperature diodes. The EMC1404 monitors one internal diode
and three externally connected temperature diodes.

Thermal management is performed in cooperation with a host device. This consists of the host reading
the temperature data of both the external and internal temperature diodes of the EMC1403 and
EMC1404 and using that data to control the speed of one or more fans.

The EMC1403 and EMC1404 have two levels of monitoring. The first provides a maskable ALERT
signal to the host when the measured temperatures exceeds user programmable limits. This allows
the EMC1403 or EMC1404 to be used as an independent thermal watchdog to warn the host of
temperature hot spots without direct control by the host. The second level of monitoring provides a non
maskable interrupt on the
programmable limit.

Since the EMC1403 and EMC1404 automatically correct for temperature errors due to series
resistance in temperature diode lines, there is greater flexibility in where external diodes are positioned
and better measurement accuracy than previously available with non-resistance error correcting
devices. The automatic beta detection feature means that there is no need to program the device
according to which type of diode is present on the External Diode 1 channel. This also includes CPU
diodes that require the transistor or BJT model for monitoring their temperature. Therefore, the
EMC1403/EMC1404 can power up ready to operate for any system configuration.

For the EMC1404, External Diode channels 2 and 3 are only compatible with general purpose diodes
(such as a 2N3904).

Figure 5.1 shows a system level block diagram of the EMC1403. Figure 5.2 shows a system level block

diagram of the EMC1404.

THERM pin if the measured temperatures meet or exceed a second

Figure 5.1 System Diagram for EMC1403

 2014 Microchip Technology Inc. DS20005272A-page 17

Figure 5.2 System Diagram for EMC1404

5.1 Modes of Operation

1°C Temperature Sensor with Beta Compensation

Data Sheet

The EMC1403 and EMC1404 have two modes of operation.

 Active (Run) - In this mode of operation, the ADC is converting on all temperature channels at the

programmed conversion rate. The temperature data is updated at the end of every conversion and
the limits are checked. In Active mode, writing to the one-shot register will do nothing.

 Standby (Stop) - In this mode of operation, the majority of circuitry is powered down to reduce

supply current. The temperature data is not updated and the limits are not checked. In this mode
of operation, the SMBus is fully active and the part will return requested data. Writing to the one­shot register will enable the device to update all temperature channels. Once all the channels are
updated, the device will return to the Standby mode.

5.1.1 Conversion Rates

The EMC1403 and EMC1404 may be configured for different conversion rates based on the system
requirements. The conversion rate is configured as described in
rate is 4 conversions per second. Other available conversion rates are shown in Table 6.6.

5.1.2 Dynamic Averaging

Dynamic averaging causes the EMC1403 and EMC1404 to measure the external diode channels for
an extended time based on the selected conversion rate. This functionality can be disabled for
increased power savings at the lower conversion rates (see
enabled, the device will automatically adjust the sampling and measurement time for the external diode
channels. This allows the device to average 2x or 16x longer than the normal 11 bit operation
(nominally 21ms per channel) while still maintaining the selected conversion rate. The benefits of
dynamic averaging are improved noise rejection due to the longer integration time as well as less
random variation of the temperature measurement.

When enabled, the dynamic averaging applies when a one-shot command is issued. The device will
perform the desired averaging during the one-shot operation according to the selected conversion rate.

When enabled, the dynamic averaging will affect the average supply current based on the chosen
conversion rate as shown in

Section 6.5. The default conversion

Section 6.4). When dynamic averaging is

Table 5.1 for EMC1403.

DS20005272A-page 18  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Table 5.1 Supply Current vs. Conversion Rate for EMC1403

CONVERSION RATE

1 / 16 sec 660uA 430uA 16x 1x

1 / 8 sec 660uA 430uA 16x 1x

1 / 4 sec 660uA 430uA 16x 1x

1 / 2 sec 660uA 430uA 16x 1x

1 / sec 660uA 430uA 16x 1x

2 / sec 930uA 475uA 8x 1x

4 / sec (default) 950uA 510uA 4x 1x

8 / sec 1010uA 630uA 2x 1x

16 / sec 1020uA 775uA 1x 1x

32 / sec 1050uA 1050uA 0.5x 0.5x

64 / sec 1100uA 1100uA 0.25x 0.25x

When enabled, the dynamic averaging will affect the average supply current based on the chosen
conversion rate as shown in

AVERAGE SUPPLY CURRENT

ENABLED

(DEFAULT) DISABLED

Table 5.2 for EMC1404.

AVERAGING FACTOR (BASED ON

11-BIT OPERATION)

ENABLED

(DEFAULT) DISABLED

Table 5.2 Supply Current vs. Conversion Rate for EMC1404

AVERAGING FACTOR (BASED ON 1 1-BIT

CONVERSION RATE

AVERAGE SUPPLY CURRENT

ENABLED

(DEFAULT) DISABLED

ENABLED

(DEFAULT) DISABLED

OPERATION)

1 / 16 sec 660uA 430uA 16x 1x

1 / 8 sec 660uA 430uA 16x 1x

1 / 4 sec 660uA 430uA 16x 1x

1 / 2 sec 660uA 430uA 16x 1x

1 / sec 660uA 430uA 8x 1x

2 / sec 930uA 475uA 4x 1x

4 / sec (default) 950uA 510uA 2x 1x

8 / sec 1010uA 630uA 1x 1x

16 / sec 1020uA 775uA 0.5x 0.5x

 2014 Microchip Technology Inc. DS20005272A-page 19

1°C Temperature Sensor with Beta Compensation

Table 5.2 Supply Current vs. Conversion Rate for EMC1404 (continued)

Data Sheet

AVERAGE SUPPLY CURRENT

CONVERSION RATE

32 / sec 1050uA 1050uA 0.25x 0.25x

64 / sec 1100uA 1100uA 0.125x 0.125x

ENABLED

(DEFAULT) DISABLED

5.2 THERM Output

The THERM output is asserted independently of the ALERT output and cannot be masked. Whenever
any of the measured temperatures exceed the user programmed THERM Limit values for the
programmed number of consecutive measurements, the
asserted, it will remain asserted until all measured temperatures drop below the THERM Limit minus
the THERM Hysteresis (also programmable).

When the THERM pin is asserted, the Therm status bits will likewise be set. Reading these bits will
not clear them until the
status bits will be automatically cleared.

5.3 ALERT Output

The ALERT pin is an open drain output and requires a pull-up resistor to VDD and has two modes of
operation: interrupt mode and comparator Mode. The mode of the
ALERT / COMP bit in the Configuration Register (see

AVERAGING FACTOR (BASED ON 1 1-BIT

OPERATION)

ENABLED

(DEFAULT) DISABLED

THERM output is asserted. Once it has been

THERM pin is deasserted. Once the THERM pin is deasserted, the THERM

ALERT output is selected via the

Section 6.4).

5.3.1 ALERT Pin Interrupt Mode

When configured to operate in interrupt mode, the ALERT pin asserts low when an out of limit
measurement (
The

ALERT pin will remain asserted as long as an out-of-limit condition remains. Once the out-of-limit
condition has been removed, the
cleared.

The ALERT pin can be masked by setting the MASK bit. Once the ALERT pin has been masked, it
will be de-asserted and remain de-asserted until the MASK bit is cleared by the user. Any interrupt
conditions that occur while the

The ALERT pin is used as an interrupt signal or as an Smbus Alert signal that allows an SMBus slave
to communicate an error condition to the master. One or more
together.

> high limit or < low limit) is detected on any diode or when a diode fault is detected.

ALERT pin will remain asserted until the appropriate status bits are

ALERT pin is masked will update the Status Register normally.

5.3.2 ALERT Pin Comparator Mode

When the ALERT pin is configured to operate in comparator mode it will be asserted if any of the
measured temperatures exceeds the respective high limit. The
all temperatures drop below the corresponding high limit minus the THERM Hysteresis value.

When the ALERT pin is asserted in comparator mode, the corresponding high limit status bits will be
set. Reading these bits will not clear them until the
deasserted, the status bits will be automatically cleared.

The MASK bit will not block the ALERT pin in this mode, however the individual channel masks (see

Section 6.11) will prevent the respective channel from asserting the ALERT pin.

ALERT outputs can be hard-wired

ALERT pin will remain asserted until

ALERT pin is deasserted. Once the ALERT pin is

DS20005272A-page 20  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

5.4 Beta Compensation

The EMC1403 and EMC1404 are configured to monitor the temperature of basic diodes (e.g. 2N3904),
or CPU thermal diodes. It automatically detects the type of external diode (CPU diode or diode
connected transistor) and determines the optimal setting to reduce temperature errors introduced by
beta variation for the External Diode 1 channel only. Compensating for this error is also known as
implementing the transistor or BJT model for temperature measurement.

For discrete transistors configured with the collector and base shorted together, the beta is generally
sufficiently high such that the percent change in beta variation is very small. For example, a 10%
variation in beta for two forced emitter currents with a transistor whose ideal beta is 50 would contribute
approximately 0.25°C error at 100°C. However for substrate transistors where the base-emitter junction
is used for temperature measurement and the collector is tied to the substrate, the proportional beta
variation will cause large error. For example, a 10% variation in beta for two forced emitter currents
with a transistor whose ideal beta is 0.5 would contribute approximately 8.25°C error at 100°C.

The External Diode 2 and External Diode 3 channels do not support Beta Compensation.

5.5 Resistance Error Correction (REC)

Parasitic resistance in series with the external diodes will limit the accuracy obtainable from
temperature measurement devices. The voltage developed across this resistance by the switching
diode currents cause the temperature measurement to read higher than the true temperature.
Contributors to series resistance are PCB trace resistance, on die (i.e. on the processor) metal
resistance, bulk resistance in the base and emitter of the temperature transistor. Typically, the error
caused by series resistance is +0.7°C per ohm. The EMC1403 and EMC1404 automatically correct up
to 100 ohms of series resistance.

5.6 Programmable External Diode Ideality Factor

The EMC1403 and EMC1404 is designed for external diodes with an ideality factor of 1.008. Not all
external diodes, processor or discrete, will have this exact value. This variation of the ideality factor
introduces error in the temperature measurement which must be corrected for. This correction is
typically done using programmable offset registers. Since an ideality factor mismatch introduces an
error that is a function of temperature, this correction is only accurate within a small range of
temperatures. To provide maximum flexibility to the user, the EMC1403 and EMC1404 provides a 6­bit register for each external diode where the ideality factor of the diode used is programmed to
eliminate errors across all temperatures.

APPLICATION NOTE: When monitoring a substrate transistor or CPU diode and beta compensation is enabled, the

Ideality Factor should not be adjusted. Beta Compensation automatically corrects for most
ideality errors.

5.7 Diode Faults

The EMC1403 and EMC1404 detect an open on the DP and DN pins, and a short across the DP and
DN pins. For each temperature measurement made, the device checks for a diode fault on the external
diode channel(s). When a diode fault is detected, the ALERT pin asserts (unless masked, see

Section 5.8) and the temperature data reads 00h in the MSB and LSB registers (note: the low limit will

not be checked). A diode fault is defined as one of the following: an open between DP and DN, a short
from V

If a short occurs across DP and DN or a short occurs from DP to GND, the low limit status bit is set
and the ALERT pin asserts (unless masked). This condition is indistinguishable from a temperature
measurement of 0.000degC (-64°C in extended range) resulting in temperature data of 00h in the MSB
and LSB registers.

If a short from DN to GND occurs (with a diode connected), temperature measurements will continue
as normal with no alerts.

to DP, or a short from VDD to DN.

DD

 2014 Microchip Technology Inc. DS20005272A-page 21

5.8 Consecutive Alerts

The EMC1403 and EMC1404 contain multiple consecutive alert counters. One set of counters applies
to the

ALERT pin and the second set of counters applies to the THERM pin. Each temperature
measurement channel has a separate consecutive alert counter for each of the
pins. All counters are user programmable and determine the number of consecutive measurements
that a temperature channel(s) must be out-of-limit or reporting a diode fault before the corresponding
pin is asserted.

See Section 6.12 for more details on the consecutive alert function.

5.9 Digital Filter

To reduce the effect of noise and temperature spikes on the reported temperature, the External Diode
1 channel uses a programmable digital filter. This filter can be configured as Level 1, Level 2, or
Disabled. The typical filter performance is shown in

1°C Temperature Sensor with Beta Compensation

Data Sheet

ALERT and THERM

Figure 5.3 and Figure 5.4.

Figure 5.3 Temperature Filter Step Response

DS20005272A-page 22  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Figure 5.4 Temperature Filter Impulse Response

5.10 Temperature Monitors

In general, thermal diode temperature measurements are based on the change in forward bias voltage
of a diode when operated at two different currents. This
as shown in the following equation:

Figure 5.5 shows a block diagram of the temperature measurement circuit. The negative terminal for

the remote temperature diode, DN, is internally biased with a forward diode voltage referenced to
ground.

VBE is proportional to absolute temperature

where:

k = Boltzmann’s constant
T = absolute temperature in Kelvin [1]
q = electron charge

 = diode ideality factor

 2014 Microchip Technology Inc. DS20005272A-page 23

1°C Temperature Sensor with Beta Compensation

Data Sheet

Figure 5.5 Block Diagram of Temperature Monitoring Circuit

5.11 Temperature Measurement Results and Data

The temperature measurement results are stored in the internal and external temperature registers.
These are then compared with the values stored in the high and low limit registers. Both external and
internal temperature measurements are stored in 11-bit format with the eight (8) most significant bits
stored in a high byte register and the three (3) least significant bits stored in the three (3) MSB
positions of the low byte register. All other bits of the low byte register are set to zero.

The EMC1403 and EMC1404 have two selectable temperature ranges. The default range is from 0°C
to +127°C and the temperature is represented as binary number able to report a temperature from 0°C
to +127.875°C in 0.125°C steps.

The extended range is an extended temperature range from -64°C to +191°C. The data format is a
binary number offset by 64°C. The extended range is used to measure temperature diodes with a large
known offset (such as AMD processor diodes) where the diode temperature plus the offset would be
equivalent to a temperature higher than +127°C.

Table 5.3 shows the default and extended range formats.

Table 5.3 Temperature Data Format

TEMPERATURE (°C) DEFAULT RANGE 0°C TO 127°C EXTENDED RANGE -64°C TO 191°C

Diode Fault 000 0000 0000 000 0000 0000

-64 000 0000 0000 000 0000 0000

Note 5.2

-1 000 0000 0000 001 1111 1000

0 000 0000 0000

Note 5.1

0.125 000 0000 0001 010 0000 0001

1 000 0000 1000 010 0000 1000

DS20005272A-page 24  2014 Microchip Technology Inc.

010 0000 0000

1°C Temperature Sensor with Beta Compensation

Data Sheet

Table 5.3 Temperature Data Format (continued)

TEMPERATURE (°C) DEFAULT RANGE 0°C TO 127°C EXTENDED RANGE -64°C TO 191°C

64 010 0000 0000 100 0000 0000

65 010 0000 1000 100 0000 1000

127 011 1111 1000 101 1111 1000

127.875 011 1111 1111 101 1111 1111

128 011 1111 1111

Note 5.3

190 011 1111 1111 111 1111 0000

191 011 1111 1111 111 1111 1000

>= 191.875 011 1111 1111 111 1111 1111

Note 5.1 In default mode, all temperatures < 0°C will be reported as 0°C.
Note 5.2 In the extended range, all temperatures < -64°C will be reported as -64°C.
Note 5.3 For the default range, all temperatures > +127.875°C will be reported as +127.875°C.
Note 5.4 For the extended range, all temperatures > +191.875°C will be reported as +191.875°C.

110 0000 0000

Note 5.4

5.12 Anti-parallel Diode Connections

The EMC1404 supports reading two external diodes on the same set of pins (DP2, DN2). These
diodes are connected as shown in
diodes will be reverse biased by a VBE voltage (approximately 0.7V). Because of this reverse bias,
only discrete thermal diodes (such as a 2N3904) are recommended to be placed on these pins.

Figure 5.2. Due to the anti-parallel connection of these diodes, both

5.13 External Diode Connections

The EMC1403 can be configured to measure a CPU substrate transistor, a discrete 2N3904 thermal
diode, or an AMD processor diode. The diodes can be connected in a variety of ways as indicated in

Figure 5.6.

The EMC1404 can be configured to measure a CPU substrate transistor, a discrete 2N3904 thermal
diode, or an AMD processor diode on the External Diode 1 channel only. The External Diode 2 and
External Diode 3 channels are configured to measure a pair of discrete anti-parallel diodes (shared on
pins DP2 and DN2). The supported configurations for the external diode channels are shown in

Figure 5.6.

 2014 Microchip Technology Inc. DS20005272A-page 25

1°C Temperature Sensor with Beta Compensation

Figure 5.6 Diode Configurations

Data Sheet

DS20005272A-page 26  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Chapter 6 Register Description

The registers shown in Table 6.1 are accessible through the SMBus. An entry of ‘-’ indicates that the
bit is not used and will always read ‘0’.

Table 6.1 Register Set in Hexadecimal Order

REGISTER
ADDRESS R/W REGISTER NAME FUNCTION

00h R

01h R

02h R Status

03h R/W Configuration

04h R/W Conversion Rate

05h R/W

06h R/W

07h R/W

Internal Diode Data

High Byte

External Diode 1

Data High Byte

Internal Diode High

Limit

Internal Diode Low

Limit

External Diode 1

High Limit High Byte

Stores the integer data for the

Internal Diode

Stores the integer data for External

Diode 1

Stores the status bits for the

Internal Diode and External Diodes

Controls the general operation of

the device (mirrored at address

09h)

Controls the conversion rate for

updating temperature data
(mirrored at address 0Ah)

Stores the 8-bit high limit for the

Internal Diode (mirrored at address

0Bh)

Stores the 8-bit low limit for the

Internal Diode (mirrored at address

0Ch)

Stores the integer portion of the

high limit for External Diode 1

(mirrored at register 0Dh)

DEFAULT

VALUE PAGE

00h

Page 30

00h

00h Page 31

00h Page 31

06h

(4/sec)

55h

(85°C)

00h

(0°C)

55h

(85°C)

Page 32

Page 33

08h R/W

09h R/W Configuration

0Ah R/W Conversion Rate

 2014 Microchip Technology Inc. DS20005272A-page 27

External Diode 1 Low

Limit High Byte

Stores the integer portion of the

low limit for External Diode 1

(mirrored at register 0Eh)

Controls the general operation of

the device (mirrored at address

03h)

Controls the conversion rate for

updating temperature data

(mirrored at address 04h)

00h

(0°C)

00h Page 31

06h

(4/sec)

Page 32

1°C Temperature Sensor with Beta Compensation

Table 6.1 Register Set in Hexadecimal Order (continued)

Data Sheet

REGISTER
ADDRESS R/W REGISTER NAME FUNCTION

0Bh R/W

0Ch R/W

0Dh R/W

0Eh R/W

Internal Diode High

Limit

Internal Diode Low

Limit

External Diode 1

High Limit High Byte

External Diode 1 Low

Limit High Byte

0Fh W One shot

10h R

External Diode 1

Data Low Byte

11h R/W Scratchpad

12h R/W Scratchpad

Stores the 8-bit high limit for the

Internal Diode (mirrored at address

05h)

Stores the 8-bit low limit for the

Internal Diode (mirrored at address

06h)

Stores the integer portion of the

high limit for External Diode 1

(mirrored at register 07h)

Stores the integer portion of the

low limit for External Diode 1

(mirrored at register 08h)

A write to this register initiates a

one shot update.

Stores the fractional data for

External Diode 1

Scratchpad register for software

compatibility

Scratchpad register for software

compatibility

DEFAULT

VALUE PAGE

55h

(85°C)

00h

(0°C)

Page 33

55h

(85°C)

00h

(0°C)

00h Page 35

00h Page 30

00h Page 35

00h Page 35

13h R/W

14h R/W

15h R/W

16h R/W

17h R/W

18h R/W

19h R/W

1Ah R/W

External Diode 1

High Limit Low Byte

External Diode 1 Low

Limit Low Byte

External Diode 2

High Limit High Byte

External DIode 2 Low

Limit High Byte

External Diode 2

High Limit Low Byte

External Diode 2 Low

Limit Low Byte

External Diode 1

THERM Limit

External Diode 2

THERM Limit

1Bh R-C External Diode Fault

1Fh R/W

Channel Mask

Register

Stores the fractional portion of the

high limit for External Diode 1

Stores the fractional portion of the

low limit for External Diode 1

Stores the integer portion of the

high limit for External Diode 2

Stores the integer portion of the

low limit for External Diode 2

Stores the fractional portion of the

high limit External Diode 2

Stores the fractional portion of the

low limit for External Diode 2

Stores the 8-bit critical temperature

limit for External Diode 1

Stores the 8-bit critical temperature

limit for External Diode 2

Stores status bits indicating which

external diode detected a diode

fault

Controls the masking of individual

channels

00h

Page 33

00h

55h

(85°C)

Page 33

00h

(0°C)

00h

Page 33

00h

55h

(85°C)

55h

(85°C)

Page 35

Page 35

00h Page 36

00h Page 36

DS20005272A-page 28  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Table 6.1 Register Set in Hexadecimal Order (continued)

REGISTER
ADDRESS R/W REGISTER NAME FUNCTION

20h R/W

Internal Diode

THERM Limit

21h R/W THERM Hysteresis

Stores the 8-bit critical temperature

limit for the Internal Diode

Stores the 8-bit hysteresis value

that applies to all THERM limits

Controls the number of out-of-limit

22h R/W Consecutive ALERT

conditions that must occur before

an interrupt is asserted

23h R

24h R

25h R/W

26h R/W

27h R/W

External Diode 2

Data High Byte

External Diode 2

Data Low Byte

External Diode 1

Beta Configuration

External Diode 2

Beta Configuration

External Diode 1

Ideality Factor

Stores the integer data for External

Diode 2

Stores the fractional data for

External Diode 2

Stores the Beta Compensation

circuitry settings for External Diode

1

Stores the Beta Compensation

circuitry settings for External Diode 208h or 07h Page 38

Stores the ideality factor for

External Diode 1

DEFAULT

VALUE PAGE

55h

(85°C)

Page 35

0Ah

(10°C)

70h Page 37

00h

Page 30

00h

08h Page 38

12h

(1.008)

Page 39

28h R/W

29h R

2Ah R

2Bh R

2Ch R/W

2Dh R/W

2Eh R/W

2Fh R/W

30h R/W

31h R/W

External Diode 2

Ideality Factor

Internal Diode Data

Low Byte

External Diode 3

High Byte

External Diode 3 Low

Byte

External Diode 3

High Limit High Byte

External Diode 3 Low

Limit High Byte

External Diode 3

High Limit Low Byte

External Diode 3 Low

Limit Low Byte

External Diode 3

THERM Limit

External Diode 3

Ideality Factor

Stores the ideality factor for

External Diode 2

Stores the fractional data for the

Internal Diode

Stores the integer data for External

Diode 3

Stores the fractional data for

External Diode 3

Stores the integer portion of the

high limit for External Diode 3

Stores the integer portion of the

low limit for External Diode 3

Stores the fractional portion of the

high limit for External Diode 3

Stores the fractional portion of the

low limit for External Diode 3

Stores the 8-bit critical temperature

limit for External Diode 3

Stores the ideality factor for

External Diode 3

12h

(1.008)

Page 39

00h Page 30

00h

Page 30

00h

55h

(85°C)

00h

(0°C)

Page 33

00h

00h

55h

(85°C)

12h

(1.008)

Page 35

Page 39

35h R-C High Limit Status Status bits for the High Limits 00h Page 41

36h R-C Low Limit Status Status bits for the Low Limits 00h Page 41

 2014 Microchip Technology Inc. DS20005272A-page 29

1°C Temperature Sensor with Beta Compensation

Table 6.1 Register Set in Hexadecimal Order (continued)

Data Sheet

REGISTER
ADDRESS R/W REGISTER NAME FUNCTION

37h R THERM Limit Status Status bits for the THERM Limits 00h Page 42

40h R/W Filter Control

FDh R Product ID

FEh R Microchip ID

FFh R Revision

Controls the digital filter setting for

the External Diode 1 channel

Stores a fixed value that identifies

each product

Stores a fixed value that

represents Microchip

Stores a fixed value that

represents the revision number

DEFAULT

VALUE PAGE

00h Page 42

Table 6.25 Page 43

5Dh Page 43

01h or 04h Page 44

6.1 Data Read Interlock

When any temperature channel high byte register is read, the corresponding low byte is copied into
an internal ‘shadow’ register. The user is free to read the low byte at any time and be guaranteed that
it will correspond to the previously read high byte. Regardless if the low byte is read or not, reading
from the same high byte register again will automatically refresh this stored low byte data.

6.2 Temperature Data Registers

Table 6.2 Temperature Data Registers

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

00h R

29h R

01h R

10h R

23h R

24h R

2Ah R

2Bh R

As shown in Table 6.2, all temperatures are stored as an 11-bit value with the high byte representing
the integer value and the low byte representing the fractional value left justified to occupy the MSBits.

Internal Diode

High Byte

Internal Diode

Low Byte

External Diode

1 High Byte

External Diode

1 Low Byte

External Diode

2 High Byte

External Diode

2 Low Byte

External Diode

3 High Byte

External Diode

3 Low Byte

128 64 32 16 8 4 2 1 00h

0.5 0.25 0.125 - - - - - 00h

128 64 32 16 8 4 2 1 00h

0.5 0.25 0.125 - - - - - 00h

128 64 32 16 8 4 2 1 00h

0.5 0.25 0.125 - - - - - 00h

128 64 32 16 8 4 2 1 00h

0.5 0.25 0.125 - - - - - 00h

DS20005272A-page 30  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

6.3 Status Register

Table 6.3 Status Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

02h R Status BUSY - - HIGH LOW FAULT THERM - 00h

The Status Register reports general error conditions. To identify specific channels, refer to

Section 6.10, Section 6.15, Section 6.16, and Section 6.17. The individual Status Register bits are

cleared when the appropriate High Limit, Low Limit, or THERM Limit register has been read or cleared.

Bit 7 - BUSY - This bit indicates that the ADC is currently converting. This bit does not cause either
the

ALERT or THERM pins to be asserted.

Bit 4 - HIGH - This bit is set when any of the temperature channels exceeds its programmed high limit.
See the High Limit Status Register for specific channel information (
will assert the ALERT pin.

Bit 3 - LOW - This bit is set when any of the temperature channels drops below its programmed low
limit. See the Low Limit Status Register for specific channel information (
bit will assert the ALERT pin.

Bit 2 - FAULT - This bit is asserted when a diode fault is detected on any of the external diode
channels. See the External Diode Fault Register for specific channel information (
set, this bit will assert the ALERT pin.

Bit 1 - THERM - This bit is set when the any of the temperature channels exceeds its programmed
THERM limit. See the THERM Limit Status Register for specific channel information (
When set, this bit will assert the THERM pin.

Section 6.15). When set, this bit

Section 6.16). When set, this

Section 6.10). When

Section 6.17).

6.4 Configuration Register

Table 6.4 Configuration Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

03h

09h

R/W Configuration

The Configuration Register controls the basic operation of the device. This register is fully accessible
at either address.

Bit 7 - MASK_ALL - Masks the ALERT pin from asserting.

 ‘0’ (default) - The ALERT pin is not masked. If any of the appropriate status bits are set the ALERT

pin will be asserted.

 ‘1’ - The ALERT pin is masked. It will not be asserted for any interrupt condition unless it is

configured as a secondary

Bit 6 - RUN / STOP - Controls Active/Standby modes.

 ‘0’ (default) - The device is in Active mode and converting on all channels.

 ‘1’ -The device is in Standby mode and not converting.

MASK_

ALL

RUN/
STOP

ALERT/

COMP

RECD1 RECD2 RANGE

THERM pin. The Status Registers will be updated normally.

DAVG_

DIS

-

APDD

00h

 2014 Microchip Technology Inc. DS20005272A-page 31

1°C Temperature Sensor with Beta Compensation

Data Sheet

Bit 5 - ALERT/COMP - Controls the operation of the ALERT pin.

 ‘0’ (default) - The ALERT pin acts as described in Section 5.3.

 ‘1’ - The ALERT pin acts in comparator mode as described in Section 5.3.2. In this mode the

MASK_ALL bit is ignored.

Bit 4 - RECD1 - Disables the Resistance Error Correction (REC) for External Diode 1.

 ‘0’ (default)- REC is enabled for External Diode 1.

 ‘1’ - REC is disabled for External Diode 1.

Bit 3 - RECD2 - Disables the Resistance Error Correction (REC) for External Diode 2 and External
Diode 3.

 ‘0’ (default) - REC is enabled for External Diode 2 and External Diode 3.

 ‘1’ - REC is disabled for External Diode 2 and External Diode 3.

Bit 2 - RANGE - Configures the measurement range and data format of the temperature channels.

 ‘0’ (default) - The temperature measurement range is 0°C to +127.875°C and the data format is

binary.

 ‘1’ -The temperature measurement range is -64°C to +191.875°C and the data format is offset

binary (see Table 5.3).

Bit 1 - DAVG_DIS - Disables the dynamic averaging feature on all temperature channels.

 ‘0’ (default) - The dynamic averaging feature is enabled. All temperature channels will be converted

with an averaging factor that is based on the conversion rate as shown in Table 5.1 and Table 5.2.

 ‘1’ - The dynamic averaging feature is disabled. All temperature channels will be converted with a

maximum averaging factor of 1x (equivalent to 11-bit conversion). For higher conversion rates, this
averaging factor will be reduced as shown in Table 5.1 and Table 5.2.

Bit 0 - APDD (EMC1404 only) - Disables the anti-parallel diode operation. Beta Compensation is
disabled on External Diode 2 and 3 regardless of APDD setting. In addition, External Diode 2 Beta
Configuration register will be ignored.

 ‘0’ (default) - Anti-parallel diode mode is enabled. Two external diodes will be measured on the

DP2 and DN2 pins.

 ‘1’ - Anti-parallel diode mode is disabled. Only one external diode will be measured on the DP2

and DN2 pins.

6.5 Conversion Rate Register

Table 6.5 Conversion Rate Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

04h

R/W

0Ah

Conversion

Rate

- - - - CONV[3:0]

The Conversion Rate Register controls how often the temperature measurement channels are updated
and compared against the limits. This register is fully accessible at either address.

Bits 3-0 - CONV[3:0] - Determines the conversion rate as shown in Table 6.6.

DS20005272A-page 32  2014 Microchip Technology Inc.

06h

(4/sec)

1°C Temperature Sensor with Beta Compensation

Data Sheet

CONV[3:0]

0h 0 0 0 0 1 / 16

1h 0 0 0 1 1 / 8

2h 0 0 1 0 1 / 4

3h 0 0 1 1 1 / 2

4h 0 1 0 0 1

5h 0 1 0 1 2

6h 0 1 1 0 4 (default)

7h 0 1 1 1 8

8h 1 0 0 0 16

Table 6.6 Conversion Rate

CONVERSIONS / SECONDHEX 3 2 1 0

9h 1 0 0 1 32

Ah 1 0 1 0 64

Bh - Fh All others 1

6.6 Limit Registers

Table 6.7 Temperature Limit Registers

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

05h

R/W

0Bh

06h

R/W

0Ch

07h

R/W

0Dh

13h R/W

Internal Diode

High Limit

Internal Diode

Low Limit

External

Diode 1 High

Limit High

Byte

External

Diode 1 High

Limit Low

Byte

128 64 32 16 8 4 2 1

128 64 32 16 8 4 2 1

128 64 32 16 8 4 2 1

0.5 0.25 0.125 - - - - - 00h

55h

(85°C)

00h

(0°C)

55h

(85°C)

08h

R/W

0Eh

 2014 Microchip Technology Inc. DS20005272A-page 33

External

Diode 1 Low

Limit High

Byte

128 64 32 16 8 4 2 1

00h

(0°C)

1°C Temperature Sensor with Beta Compensation

Data Sheet

Table 6.7 Temperature Limit Registers (continued)

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

External

14h R/W

Diode 1 Low

Limit Low

0.5 0.25 0.125 - - - - - 00h

Byte

15h R/W

16h R/W

17h R/W

18h R/W

2Ch R/W

2Dh R/W

External

Diode 2 High

Limit High

Byte

External

Diode 2 Low

Limit High

Byte

External

Diode 2 High

Limit Low

Byte

External

Diode 2 Low

Limit Low

Byte

External

Diode 3 High

Limit High

Byte

External

Diode 3 Low

Limit High

Byte

128 64 32 16 8 4 2 1

128 64 32 16 8 4 2 1

55h

(85°C)

00h

(0°C)

0.5 0.25 0.125 - - - - - 00h

0.5 0.25 0.125 - - - - - 00h

128 64 32 16 8 4 2 1

128 64 32 16 8 4 2 1

55h

(85°C)

00h

(0°C)

External

2Eh R/W

Diode 3 High

Limit Low

0.5 0.25 0.125 - - - - - 00h

Byte

External

2Fh R/W

Diode 3 Low

Limit Low

0.5 0.25 0.125 - - - - - 00h

Byte

The device contains both high and low limits for all temperature channels. If the measured temperature
exceeds the high limit, then the corresponding status bit is set and the

ALERT pin is asserted.
Likewise, if the measured temperature is less than or equal to the low limit, the corresponding status
bit is set and the

ALERT pin is asserted.

The data format for the limits must match the selected data format for the temperature so that if the
extended temperature range is used, the limits must be programmed in the extended data format.

The limit registers with multiple addresses are fully accessible at either address.

When the device is in standby mode, updating the limit registers will have no affect until the next
conversion cycle occurs. This can be initiated via a write to the One Shot Register or by clearing the
RUN / STOP bit in the Configuration Register (see

DS20005272A-page 34  2014 Microchip Technology Inc.

Section 6.4).

1°C Temperature Sensor with Beta Compensation

Data Sheet

6.7 Scratchpad Registers

Table 6.8 Scratchpad Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

11h R/W Scratchpad 7 6 5 4 3 2 1 0 00h

12h R/W Scratchpad 7 6 5 4 3 2 1 0 00h

The Scratchpad Registers are Read Write registers that are used for place holders to be software
compatible with legacy programs. Reading from the registers will return what is written to them.

6.8 One Shot Register

Table 6.9 One Shot Register

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

0Fh W One Shot

The One Shot Register is used to initiate a one shot command. Writing to the one shot register, when
the device is in standby mode and BUSY bit (in Status Register) is ‘0’, will immediately cause the ADC
to update all temperature measurements. Writing to the One Shot Register while the device is in active
mode will have no affect.

Writing to this register initiates a single conversion cycle. Data

is not stored and always reads 00h

00h

6.9 Therm Limit Registers

Table 6.10 Therm Limit Registers

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

19h R/W

1Ah R/W

20h R/W

21h R/W

External

Diode 1

THERM Limit

External

Diode 2

THERM Limit

Internal Diode

THERM Limit

THERM

Hysteresis

128 64 32 16 8 4 2 1

128 64 32 16 8 4 2 1

128 64 32 16 8 4 2 1

128 64 32 16 8 4 2 1

55h

(85°C)

55h

(85°C)

55h

(85°C)

0Ah

(10°C)

30h R/W

The THERM Limit Registers are used to determine whether a critical thermal event has occurred. If
the measured temperature exceeds the THERM Limit, then the
setting must match the chosen data format of the temperature reading registers.

 2014 Microchip Technology Inc. DS20005272A-page 35

External

Diode 3

THERM Limit

128 64 32 16 8 4 2 1

THERM pin is asserted. The limit

55h

(85°C)

1°C Temperature Sensor with Beta Compensation

Data Sheet

Unlike the ALERT pin, the THERM pin cannot be masked. Additionally, the THERM pin will be released
once the temperature drops below the corresponding threshold minus the THERM Hysteresis.

6.10 External Diode Fault Register

Table 6.11 External Diode Fault Register

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

1Bh R-C

External

Diode Fault

- - - - E3FLT E2FLT E1FLT - 00h

The External Diode Fault Register indicates which of the external diodes caused the FAULT bit in the
Status Register to be set. This register is cleared when it is read.

Bit 3 - E3FLT - This bit is set if the External Diode 3 channel reported a diode fault.

Bit 2 - E2FLT - This bit is set if the External Diode 2 channel reported a diode fault.

Bit 1 - E1FLT - This bit is set if the External Diode 1 channel reported a diode fault.

6.11 Channel Mask Register

Table 6.12 Channel Mask Register

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

1Fh R/W

Channel

Mask

----

The Channel Mask Register controls individual channel masking. When a channel is masked, the
ALERT pin will not be asserted when the masked channel reads a diode fault or out of limit error. The
channel mask does not mask the

THERM pin.

Bit 3 - E3MASK - Masks the ALERT pin from asserting when the External Diode 3 channel is out of
limit or reports a diode fault.

 ‘0’ (default) - The External Diode 3 channel will cause the ALERT pin to be asserted if it is out of

limit or reports a diode fault.

 ‘1’ - The External Diode 3 channel will not cause the ALERT pin to be asserted if it is out of limit

or reports a diode fault.

Bit 2 - E2MASK - Masks the ALERT pin from asserting when the External Diode 2 channel is out of
limit or reports a diode fault.

 ‘0’ (default) - The External Diode 2 channel will cause the ALERT pin to be asserted if it is out of

limit or reports a diode fault.

 ‘1’ - The External Diode 2 channel will not cause the ALERT pin to be asserted if it is out of limit

or reports a diode fault.

Bit 1 - E1MASK - Masks the ALERT pin from asserting when the External Diode 1 channel is out of
limit or reports a diode fault.

 ‘0’ (default) - The External Diode 1 channel will cause the ALERT pin to be asserted if it is out of

limit or reports a diode fault.

 ‘1’ - The External Diode 1 channel will not cause the ALERT pin to be asserted if it is out of limit

or reports a diode fault.

E3

MASK

E2

MASK

E1

MASK

INT

MASK

00h

DS20005272A-page 36  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Bit 0 - INTMASK - Masks the ALERT pin from asserting when the Internal Diode temperature is out
of limit.

 ‘0’ (default) - The Internal Diode channel will cause the ALERT pin to be asserted if it is out of limit.

 ‘1’ - The Internal Diode channel will not cause the ALERT pin to be asserted if it is out of limit.

6.12 Consecutive ALERT Register

Table 6.13 Consecutive ALERT Register

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

22h R/W

The Consecutive ALERT Register determines how many times an out-of-limit error or diode fault must
be detected in consecutive measurements before the
the Consecutive ALERT Register controls the SMBus Timeout functionality.

An out-of-limit condition (i.e. HIGH, LOW, or FAULT) occurring on the same temperature channel in
consecutive measurements will increment the consecutive alert counter. The counters will also be reset
if no out-of-limit condition or diode fault condition occurs in a consecutive reading.

When the ALERT pin is configured as an interrupt, when the consecutive alert counter reaches its
programmed value, the following will occur: the STATUS bit(s) for that channel and the last error
condition(s) (i.e. E1HIGH, or E2LOW and/or E2FAULT) will be set to ‘1’, the
asserted, the consecutive alert counter will be cleared, and measurements will continue.

When the ALERT pin is configured as a comparator, the consecutive alert counter will ignore diode
fault and low limit errors and only increment if the measured temperature exceeds the High Limit.
Additionally, once the consecutive alert counter reaches the programmed limit, the
asserted, but the counter will not be reset. It will remain set until the temperature drops below the High
Limit minus the THERM Hysteresis value.

For example, if the CALRT[2:0] bits are set for 4 consecutive alerts on an EMC1403 device, the high
limits are set at 70°C, and none of the channels are masked, then the
the following four measurements:

1. Internal Diode reads 71°C and both external diodes read 69°C. Consecutive alert counter for INT

2. Both Internal Diode and External Diode 1 read 71°C and External Diode 2 reads 68°C. Consecutive

Consecutive

ALERT

TIME

OUT

CTHRM[2:0] CALRT[2:0] - 70h

ALERT or THERM pin is asserted. Additionally,

is incremented to 1.

alert counter for INT is incremented to 2 and for EXT1 is set to 1.

ALERT pin will be

ALERT pin will be

ALERT pin will be asserted after

3. The External Diode 1 reads 71°C and both the Internal Diode and External Diode 2 read 69°C.

Consecutive alert counter for INT and EXT2 are cleared and EXT1 is incremented to 2.

4. The Internal Diode reads 71°C and both external diodes read 71°C. Consecutive alert counter for

INT is set to 1, EXT2 is set to 1, and EXT1 is incremented to 3.

5. The Internal Diode reads 71°C and both the external diodes read 71°C. Consecutive alert counter

for INT is incremented to 2, EXT2 is set to 2, and EXT1 is incremented to 4. The appropriate status
bits are set for EXT1 and the

ALERT pin is asserted. EXT1 counter is reset to 0 and all other

counters hold the last value until the next temperature measurement.

Bit 7 - TIMEOUT - Determines whether the SMBus Timeout function is enabled.

 ‘0’ (default) - The SMBus Timeout feature is disabled. The SMCLK line can be held low indefinitely

without the device resetting its SMBus protocol.

 ‘1’ - The SMBus Timeout feature is enabled. If the SMCLK line is held low for more than 30ms,

then the device will reset the SMBus protocol.

 2014 Microchip Technology Inc. DS20005272A-page 37

1°C Temperature Sensor with Beta Compensation

Data Sheet

Bits 6-4 - CTHRM[2:0] - Determines the number of consecutive measurements that must exceed the
corresponding THERM Limit before the

THERM pin is asserted. All temperature channels use this
value to set the respective counters. The consecutive THERM counter is incremented whenever any
measurement exceed the corresponding THERM Limit.

If the temperature drops below the THERM limit, then the counter is reset. If a number of consecutive
measurements above the THERM limit occurs, then the

THERM pin is asserted low.

Once the THERM pin has been asserted, the consecutive therm counter will not reset until the
corresponding temperature drops below the THERM Limit minus the THERM Hysteresis value.

The bits are decoded as shown in Tab le 6.14. The default setting is 4 consecutive out of limit
conversions.

Bits 3-1 - CALRT[2:0] - Determine the number of consecutive measurements that must have an out of
limit condition or diode fault before the
to set the respective counters. The bits are decoded as shown in

ALERT pin is asserted. All temperature channels use this value

Table 6.14. The default setting is 1

consecutive out of limit conversion.

Table 6.14 Consecutive Alert / THERM Settings

210

000

MEASUREMENTS

1

(default for CALRT[2:0])

001 2

011 3

NUMBER OF CONSECUTIVE OUT OF LIMIT

111

(default for CTHRM[2:0])

4

6.13 Beta Configuration Registers

Table 6.15 Beta Configuration Registers

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

25h R/W

26h R/W

External
Diode 1 Beta
Configuration

External
Diode 2 Beta
Configuration

- - - - ENABLE1 BETA1[2:0] 08h

08h for

- - - - ENABLE2 BETA2[2:0]

EMC1403
or 07h for
EMC1404

This register is used to set the Beta Compensation factor that is used for the external diode channels.

Bit 3 - ENABLEx - Enables the Beta Compensation factor autodetection function. This function shall
be disabled for External Diode 2.

 ‘0’ - The Beta Compensation Factor autodetection circuitry is disabled. The External Diode will

always use the Beta Compensation factor set by the BETAx[2:0] bits.

 ‘1’ (default) - The Beta Compensation factor autodetection circuitry is enabled. At the beginning of

every conversion, the optimal Beta Compensation factor setting will be determined and applied.
The BETAx[2:0] bits will be automatically updated to indicate the current setting.

DS20005272A-page 38  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Bit 2-0 - BETAx[2:0] - These bits always reflect the current beta configuration settings. If autodetection
circuitry is enabled, then these bits will be updated automatically and writing to these bits will have no
effect. If the autodetection circuitry is disabled, then these bits will determine the beta configuration
setting that is used for their respective channels.

Care should be taken when setting the BETAx[2:0] bits when the autodetection circuitry is disabled. If
the Beta Compensation factor is set at a beta value that is higher than the transistor beta, then the
circuit may introduce measurement errors. When measuring a discrete thermal diode (such as
2N3904) or a CPU diode that functions like a discrete thermal diode (such as an AMD processor
diode), then the BETAx[2:0] bits should be set to ‘111b’.

Table 6.16 CPU Beta Values

BETAX[2:0]

HEX ENABLEX

MINIMUM BETA21 0

0h 0 0 0 0 0.11

1h 0 0 0 1 0.18

2h 0 0 1 0 0.25

3h 0 0 1 1 0.33

4h 0 1 0 0 0.43

5h 0 1 0 1 1.00

6h 0 1 1 0 2.33

7h 0 1 1 1 Disabled

8h - Fh 1 X X X Autodetection

6.14 External Diode Ideality Factor Registers

Table 6.17 Ideality Configuration Registers

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

External

27h R/W

Diode 1

Ideality

Factor

- - IDEALITY1[5:0] 12h

External

28h R/W

Diode 2

Ideality

- - IDEALITY2[5:0] 12h

Factor

External

31h R/W

Diode 3

Ideality

- - IDEALITY3[5:0] 12h

Factor

These registers store the ideality factors that are applied to the external diodes. Table 6.18 defines
each setting and the corresponding ideality factor. Beta Compensation and Resistance Error Correction

 2014 Microchip Technology Inc. DS20005272A-page 39

1°C Temperature Sensor with Beta Compensation

automatically correct for most diode ideality errors, therefore it is not recommended that these settings
be updated without consulting Microchip.

Table 6.18 Ideality Factor Look-Up Table (Diode Model)

SETTING FACTOR SETTING FACTOR SETTING FACTOR

08h 0.9949 18h 1.0159 28h 1.0371

09h 0.9962 19h 1.0172 29h 1.0384

0Ah 0.9975 1Ah 1.0185 2Ah 1.0397

0Bh 0.9988 1Bh 1.0200 2Bh 1.0410

0Ch 1.0001 1Ch 1.0212 2Ch 1.0423

0Dh 1.0014 1Dh 1.0226 2Dh 1.0436

0Eh 1.0027 1Eh 1.0239 2Eh 1.0449

0Fh 1.0040 1Fh 1.0253 2Fh 1.0462

10h 1.0053 20h 1.0267 30h 1.0475

Data Sheet

11h 1.0066 21h 1.0280 31h 1.0488

12h 1.0080 22h 1.0293 32h 1.0501

13h 1.0093 23h 1.0306 33h 1.0514

14h 1.0106 24h 1.0319 34h 1.0527

15h 1.0119 25h 1.0332 35h 1.0540

16h 1.0133 26h 1.0345 36h 1.0553

17h 1.0146 27h 1.0358 37h 1.0566

For CPU substrate transistors that require the BJT transistor model, the ideality factor behaves slightly
differently than for discrete diode-connected transistors. Refer to

Table 6.19 when using a CPU

substrate transistor.

Table 6.19 Substrate Diode Ideality Factor Look-Up Table (BJT Model)

SETTING FACTOR SETTING FACTOR SETTING FACTOR

08h 0.9869 18h 1.0079 28h 1.0291

09h 0.9882 19h 1.0092 29h 1.0304

0Ah 0.9895 1Ah 1.0105 2Ah 1.0317

0Bh 0.9908 1Bh 1.0120 2Bh 1.0330

0Ch 0.9921 1Ch 1.0132 2Ch 1.0343

0Dh 0.9934 1Dh 1.0146 2Dh 1.0356

0Eh 0.9947 1Eh 1.0159 2Eh 1.0369

0Fh 0.9960 1Fh 1.0173 2Fh 1.0382

10h 0.9973 20h 1.0187 30h 1.0395

DS20005272A-page 40  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Table 6.19 Substrate Diode Ideality Factor Look-Up Table (BJT Model) (continued)

SETTING FACTOR SETTING FACTOR SETTING FACTOR

11h 0.9986 21h 1.0200 31h 1.0408

12h 1.0000 22h 1.0213 32h 1.0421

13h 1.0013 23h 1.0226 33h 1.0434

14h 1.0026 24h 1.0239 34h 1.0447

15h 1.0039 25h 1.0252 35h 1.0460

16h 1.0053 26h 1.0265 36h 1.0473

17h 1.0066 27h 1.0278 37h 1.0486

APPLICATION NOTE: When measuring a 65nm Intel CPUs, the Ideality Setting should be the default 12h. When

measuring 45nm Intel CPUs, the Ideality Setting should be 15h.

6.15 High Limit Status Register

Table 6.20 High Limit Status Register

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

35h R-C

High Limit

Status

The High Limit Status Register contains the status bits that are set when a temperature channel high
limit is exceeded. If any of these bits are set, then the HIGH status bit in the Status Register is set.
Reading from the High Limit Status Register will clear all bits if. Reading from the register will also
clear the HIGH status bit in the Status Register.

The ALERT pin will be set if the programmed number of consecutive alert counts have been met and
any of these status bits are set.

The status bits will remain set until read unless the ALERT pin is configured as a comparator output
(see

Section 5.3.2).

Bit 3 - E3HIGH - This bit is set when the External Diode 3 channel exceeds its programmed high limit.

Bit 2 - E2HIGH - This bit is set when the External Diode 2 channel exceeds its programmed high limit.

Bit 1 - E1HIGH - This bit is set when the External Diode 1 channel exceeds its programmed high limit.

Bit 0 - IHIGH - This bit is set when the Internal Diode channel exceeds its programmed high limit.

- - - - E3HIGH E2HIGH E1HIGH IHIGH 00h

6.16 Low Limit Status Register

Table 6.21 Low Limit Status Register

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

36h R-C

 2014 Microchip Technology Inc. DS20005272A-page 41

Low Limit

Status

The Low Limit Status Register contains the status bits that are set when a temperature channel drops
below the low limit. If any of these bits are set, then the LOW status bit in the Status Register is set.

- - - - E3LOW E2LOW E1LOW ILOW 00h

Reading from the Low Limit Status Register will clear all bits. Reading from the register will also clear
the LOW status bit in the Status Register.

The ALERT pin will be set if the programmed number of consecutive alert counts have been met and
any of these status bits are set.

The status bits will remain set until read unless the ALERT pin is configured as a comparator output
(see

Section 5.3.2).

Bit 3 - E3LOW - This bit is set when the External Diode 3 channel drops below its programmed low
limit.

Bit 2 - E2LOW - This bit is set when the External Diode 2 channel drops below its programmed low
limit.

Bit 1 - E1LOW - This bit is set when the External Diode 1 channel drops below its programmed low
limit.

Bit 0 - ILOW - This bit is set when the Internal Diode channel drops below its programmed low limit.

6.17 THERM Limit Status Register

Table 6.22 THERM Limit Status Register

1°C Temperature Sensor with Beta Compensation

Data Sheet

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

37h R-C

THERM

Limit

Status

The THERM Limit Status Register contains the status bits that are set when a temperature channel
THERM Limit is exceeded. If any of these bits are set, then the THERM status bit in the Status Register
is set. Reading from the THERM Limit Status Register will not clear the status bits. Once the
temperature drops below the THERM Limit minus the THERM Hysteresis, the corresponding status
bits will be automatically cleared. The THERM bit in the Status Register will be cleared when all
individual channel THERM bits are cleared.

Bit 3 - E3THERM - This bit is set when the External Diode 3 channel exceeds its programmed THERM
Limit. When set, this bit will assert the

Bit 2 - E2THERM - This bit is set when the External Diode 2 channel exceeds its programmed THERM
Limit. When set, this bit will assert the

Bit 1 - E1THERM - This bit is set when the External Diode 1 channel exceeds its programmed THERM
limit. When set, this bit will assert the

Bit 0- ITHERM - This bit is set when the Internal Diode channel exceeds its programmed THERM limit.
When set, this bit will assert the

-- - -

THERM pin.

THERM pin.

THERM pin.

THERM pin.

E3

THERM

E2

THERM

E1

THERM

ITHERM 00h

6.18 Filter Control Register

Table 6.23 Filter Configuration Register

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

40h R/W Filter Control - - - - - - FILTER[1:0] 00h

The Filter Configuration Register controls the digital filter on the External Diode 1 channel.

DS20005272A-page 42  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Bits 1-0 - FILTER[1:0] - Control the level of digital filtering that is applied to the External Diode
temperature measurements as shown in
filter behavior.

Table 6.24 Filter Settings

FILTER[1:0]

0 0 Disabled (default)

0 1 Level 1

1 0 Level 1

1 1 Level 2

6.19 Product ID Register

Table 6.24. See Figure 5.3and Figure 5.4 for examples on the

AVERAGING10

Table 6.25 Product ID Register

ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

FDh R Product ID 00100001

FDh R Product ID 00100101

The Product ID Register holds a unique value that identifies the device.

21h

EMC1403

25h

EMC1404

6.20 Microchip ID Register (FEh)

Table 6.26 Manufacturer ID Register

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

FEh R MCHP ID 0 1 0 1 1 1 0 1 5Dh

The Manufacturer ID register contains an 8 bit word that identifies the Microchip as the manufacturer
of the EMC1403 and EMC1404.

 2014 Microchip Technology Inc. DS20005272A-page 43

1°C Temperature Sensor with Beta Compensation

Data Sheet

6.21 Revision Register (FFh)

Table 6.27 Revision Register

ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT

FFh R Revision 00000001 01h

FFh R Revision 00000100 04h

The Revision register contains an 8-bit word that identifies the die revision. It can be 01h or 04h.

DS20005272A-page 44  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Chapter 7 Typical Operating Curves

 2014 Microchip Technology Inc. DS20005272A-page 45

1°C Temperature Sensor with Beta Compensation

Data Sheet

DS20005272A-page 46  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Chapter 8 Package Information

Note: For the most current package drawings, see the Microchip Packaging Specification at

http://www.microchip.com/packaging.

Figure 8.1 10-Pin MSOP / TSSOP Package

 2014 Microchip Technology Inc. DS20005272A-page 47

1°C Temperature Sensor with Beta Compensation

Data Sheet

Note: For the most current package drawings,

see the Microchip Packaging Specification at

http://www.microchip.com/packaging

Figure 8.2 10-Pin DFN Package Drawing (1 of 2)

DS20005272A-page 48  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

Note: For the most current package drawings,

see the Microchip Packaging Specification at

http://www.microchip.com/packaging

Figure 8.3 10-Pin DFN Package Dimensions (2 of 2)

 2014 Microchip Technology Inc. DS20005272A-page 49

1°C Temperature Sensor with Beta Compensation

Data Sheet

Note: For the most current package drawings,

see the Microchip Packaging Specification at

http://www.microchip.com/packaging

Figure 8.4 Package Drawing and PCB Footprint for SOIC-14

DS20005272A-page 50  2014 Microchip Technology Inc.

1°C Temperature Sensor with Beta Compensation

Data Sheet

8.1 Package Markings

8.1.1 EMC1404-X-AIZL (10-pin MSOP)

All devices will be marked on the first line of the top side with “1404”. On the second line, they will be
marked with the appropriate -X number (-1, -2, etc), the Functional Revision “B” and Country Code
(CC).

8.1.2 EMC1403-X-AIZL (10-pin MSOP)

All devices will be marked on the first line of the top side with “1403”. On the second line, packages
will be marked with the appropriate -X number (-1, -2, etc), the Functional Revision “B” and Country
Code (CC).

8.1.3 EMC1403-1-AIA and EMC1403-2-AIA (10-pin DFN)

The EMC1403-1-AIA will be marked on the first line of the top side with the code “31” followed by the
first two characters of the last 6 characters of the Lot Number. The EMC1403-2-AIA is marked with
the code “32” followed by the first two characters of the last 6 characters of the Lot Number. On the
second line, packages will be marked with the last 4 characters of the Lot Number.

For example: If the Lot Number is “2H123456A”, the first line on the EMC1403-1-AIA will read “3123”
and the second line will read “456A”.

8.1.4 EMC1403-YZT

All devices will be marked on the first line of the top side with “EMC1403” followed by “-X” where X is
the appropriate -X number (-1, -2, etc). On the second line, packages will be marked with Functional
Revision “B”, date code and the last 7 characters of Lot Number.

 2014 Microchip Technology Inc. DS20005272A-page 51

1°C Temperature Sensor with Beta Compensation

Chapter 9 Data Sheet Revision History

Table 9.1 Revision History

REVISION LEVEL & DATE SECTION/FIGURE/ENTRY CORRECTION

REV A REV A replaces previous SMSC version Rev. 2.0 (08-10-12)

Data Sheet

Rev. 2.0 (08-10-12) Table 3.3, "SMBus Electrical

Specifications"

Section 6.21, "Revision
Register (FFh)"

Rev. 1.38 (02-28-12) Figure 2.2,

"EMC1403/EMC1404 Pin
Diagram, DFN-10"

Table 2.1, "EMC1403 and
EMC1404 Pin Description"

Rev. 1.37 (01-06-10) Section 8.1.4, "EMC1403-

YZT"

Section 8.1.3, "EMC1403-1-

AIA and EMC1403-2-AIA

(10-pin DFN)"

Rev. 1.36 (07-02-09) Table 2.1, "EMC1403 and

EMC1404 Pin Description"

Table 2.1, "EMC1403 and
EMC1404 Pin Description"

Added conditions for t
minimum of 0.3μs is required when receiving from
the master. Data hold time is 0μs min when
transmitting to the master.

Added row to indicate that revision ID can be 04h.
Revision ID may be 04h or 01h.

Added exposed pad and updated so it looks more
like a square.

Added last row for DFN bottom pad.
Recommendation is to connect it to ground.

Added to last sentence: “Revision “B”, date code
and the last 7 characters of” before “Lot Number”.

Corrected device code. Instead of being “32” for
both devices in the 10-pin DFN package, the code
is “31” for the EMC1403-1-AIA and “32” for the
EMC1403-2-AIA.

In pin description table, added to function column:
“requires pull-up resistor” for SMDATA and SMCLK
pins

Identified 5V tolerant pins. Added the following
application note below table: “For the 5V tolerant
pins that have a pull-up resistor (SMCLK,
SMDATA,
difference between VDD and the pull-up voltage
must never exceed 3.6V.”

THERM, and ALERT), the voltage

. Data hold time

HD:DAT

Table 3.1, "Absolute
Maximum Ratings"

Table 3.2, "Electrical
Specifications"

DS20005272A-page 52  2014 Microchip Technology Inc.

Updated voltage limits for 5V tolerant pins with
pull-up resistors.

Added the following note below table: “For the 5V
tolerant pins that have a pull-up resistor (SMCLK,
SMDATA,
voltage must not exceed 3.6V when the device is
unpowered.”

Added leakage current.

THERM, and ALERT), the pull-up

1°C Temperature Sensor with Beta Compensation

Data Sheet

Table 9.1 Revision History (continued)

REVISION LEVEL & DATE SECTION/FIGURE/ENTRY CORRECTION

Rev. 1.35 (04-14-09) Figure 8.2, "10-Pin DFN

Package Drawing (1 of 2)"

Figure 8.3, "10-Pin DFN
Package Dimensions (2 of

2)"

Figure 8.4, "10 Pin DFN
PCB Footprint"

Table 3.1, "Absolute
Maximum Ratings"

Rev. 1.34 (02-27-09) Table 5.3, "Temperature

Data Format"

Rev. 1.33 (08-18-08) Ordering Information and

Table 1.1, "Part Selection"

Rev. 1.32 (07-10-08) Ordering Information and

Table 1.1, "Part Selection"

Rev. 1.31 (07-01-08) Ordering Information and

Table 1.1, "Part Selection"

Diagrams updated

Updated thermal resistance numbers

Extended range for -1 updated from 001 1111 1111
to 001 1111 1000

Added EMC1403-3 and EMC1403-4 for all
package options

Added EMC1404-4

Added EMC1404-2 and EMC1404-3

 2014 Microchip Technology Inc. DS20005272A-page 53

1°C Temperature Sensor with Beta Compensation

Data Sheet

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be
superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO
REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE,
MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of
Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implic­itly or otherwise, under any Microchip intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, dsPIC, FlashFlex, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, PIC32
logo, rfPIC, SST, SST Logo, SuperFlash and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and
other countries.

FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor, MTP, SEEVAL and The Embedded Control Solutions Company are
registered trademarks of Microchip Technology Incorporated in the U.S.A.

Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries.

Analog-for-the-Digital Age, Application Maestro, BodyCom, chipKIT, chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net,
dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP, Mindi, MiWi, MPASM,
MPF, MPLAB Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
PICtail, REAL ICE, rfLAB, Select Mode, SQI, Serial Quad I/O, Total Endurance, TSHARC, UniWinDriver, WiperLock, ZENA and Z­Scale are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

GestIC and ULPP are registered trademarks of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip
Technology Inc., in other countries.

A more complete list of registered trademarks and common law trademarks owned by Standard Microsystems Corporation (“SMSC”)
is available at: www.smsc.com. The absence of a trademark (name, logo, etc.) from the list does not constitute a waiver of any
intellectual property rights that SMSC has established in any of its trademarks.

All other trademarks mentioned herein are property of their respective companies.

© 2014, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.

ISBN: 9781620779439

Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.

®

MCUs and dsPIC® DSCs, KEELOQ

®

code hopping

DS20005272A-page 54  2014 Microchip Technology Inc.

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10/28/13

DS20005272A-page 55  2014 Microchip Technology Inc.