EMC1072 DATA SHEET (10/11/2010) DOWNLOAD

EMC1072
1°C Temperature Sensor
with Selectable Address
PRODUCT FEATURES
Datasheet
General Description
Features
The EMC1072 is a high accuracy, low cost, System
Management Bus (SMBus) temperature sensor with pin
selectable SMBus address.
„
„
— ±0.25°C typ accuracy (20°C < TDIODE < 110°C)
— 0.125°C resolution
— Supports 2N3904 and AMD diodes
The device provides ±1° accuracy (max) for external
diode temperatures and ±2°C accuracy (max) for the
internal diode temperature. The EMC1072 monitors two
temperature channels (one external and one internal).
„
Internal Temperature Monitor
„
3.3V Supply Voltage
SMBus 2.0 Compliant
— ±0.25°C typ accuracy (-5°C < TA < 100°C)
„
Applications
„
„
„
„
Pin Compatible with ADM1032, MAX6649, and LM99
External Temperature Monitors
— Programmable SMBus address
Notebook Computers
Desktop Computers
Industrial
Embedded applications
„
„
Programmable Temperature Limits for ALERT and
THERM
Available in Small 8-pin MSOP Lead-free RoHS
Compliant Package
Block Diagram
VDD
EMC1072
Conversion Rate Register
DP
Digital Mux
ΔΣ ADC
External Temperature
Register(s)
Limit Comparator
Analog
Mux
Digital Mux
High Limit Registers
SMBus Interface
Low Limit Registers
Switching
Current
SMCLK
SMDATA
THERM Limit Register
THERM Hysteresis Register
Internal
Temperature Register
DN
Configuration Register
Internal Temp
Diode
Interupt Masking
ALERT
Status Registers
SMBus Address Decode
THERM/ADDR
GND
SMSC EMC1072
DATASHEET
Revision 1.39 (10-11-10)
1°C Temperature Sensor with Selectable Address
Datasheet
Order Number(s):
EMC1072-1-ACZL-TR for 8-pin, MSOP Lead-Free RoHS Compliant package
EMC1072-A-ACZL-TR for 8-pin, MSOP Lead-Free 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
For RoHS compliance and environmental information, please visit www.smsc.com/rohs
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123
Copyright © 2010 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property
damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered
trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.
SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE
OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL
DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT;
TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD
TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Revision 1.39 (10-11-10)
2
DATASHEET
SMSC EMC1072
1°C Temperature Sensor with Selectable Address
Datasheet
Table of Contents
Chapter 1 Part Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Chapter 3 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1
3.2
3.3
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SMBus Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 4 System Management Bus Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
System Management Bus Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Write Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Read Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Send Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receive Byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12
13
13
13
13
14
14
Chapter 5 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1
Conversion Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.2
Dynamic Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THERM Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.1
THERM Pin Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ALERT Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.1
ALERT Pin Interrupt Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.2
ALERT Pin Comparator Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programmable External Diode Ideality Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diode Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Consecutive Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Measurement Results and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Diode Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
15
16
16
17
17
17
17
18
18
18
18
20
20
21
Chapter 6 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
6.12
6.13
6.14
Data Read Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conversion Rate Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scratchpad Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
One Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Therm Limit Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Channel Mask Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Consecutive ALERT Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Diode Ideality Factor Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMSC EMC1072
3
DATASHEET
24
24
24
25
26
27
27
28
28
28
29
30
31
32
Revision 1.39 (10-11-10)
1°C Temperature Sensor with Selectable Address
Datasheet
6.15
6.16
SMSC ID Register (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Revision Register (FFh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Chapter 7 Typical Operating Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Chapter 8 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.1
Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Chapter 9 Datasheet Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Revision 1.39 (10-11-10)
4
DATASHEET
SMSC EMC1072
1°C Temperature Sensor with Selectable Address
Datasheet
List of Figures
Figure 2.1
Figure 4.1
Figure 5.1
Figure 5.2
Figure 5.3
Figure 5.4
Figure 5.5
Figure 8.1
Figure 8.2
EMC1072 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System Diagram for EMC1072 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Isolating THERM Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Temperature Filter Step Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Temperature Filter Impulse Response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Diode Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8-Pin MSOP / TSSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
EMC1072 Package Markings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
SMSC EMC1072
5
DATASHEET
Revision 1.39 (10-11-10)
1°C Temperature Sensor with Selectable Address
Datasheet
List of Tables
Table 1.1 Part Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 2.1 EMC1072 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 3.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 3.3 SMBus Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 4.1 Protocol Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 4.2 Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 4.3 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4.4 Send Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4.5 Receive Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4.6 Alert Response Address Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4.7 SMBus Address Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 5.1 Supply Current vs. Conversion Rate for EMC1072 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 5.2 EMC1072 Temperature Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 6.1 Register Set in Hexadecimal Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 6.2 Temperature Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 6.3 Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 6.4 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 6.5 Conversion Rate Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 6.6 Conversion Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 6.7 Temperature Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 6.8 Scratchpad Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 6.9 One Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 6.10 Therm Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 6.11 Channel Mask Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 6.12 Consecutive ALERT Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 6.13 Consecutive Alert / THERM Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 6.14 Ideality Configuration Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 6.15 Ideality Factor Look-Up Table (Diode Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 6.16 Filter Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 6.17 Filter Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 6.18 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 6.19 Manufacturer ID Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 6.20 Revision Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 9.1 Customer Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Revision 1.39 (10-11-10)
6
DATASHEET
SMSC EMC1072
1°C Temperature Sensor with Selectable Address
Datasheet
Chapter 1 Part Selection
The EMC1072 device configuration is highlighted below.
Table 1.1 Part Selection
FUNCTIONALITY
PART
NUMBER
SMBUS
ADDRESS
EMC1072 - 1
1001_100xb
EXTERNAL
DIODES
SMSC EMC1072
DIODE 2
DEFAULT
CONFIGURATION
OTHER
PRODUCT
ID
Software programmable and maskable High Limits
1
EMC1072 - A
DIODE 1
DEFAULT
CONFIGURATION
AMD or 3904
20h
N/A
Software programmable THERM
Limits
See Table 4.7
7
DATASHEET
Revision 1.39 (10-11-10)
1°C Temperature Sensor with Selectable Address
Datasheet
Chapter 2 Pin Description
VDD
1
8
S M C LK
DP
2
7
SM DATA
DN
3
6
A LE R T
THERM / ADDR
4
5
GND
Figure 2.1 EMC1072 Pin Diagram
Table 2.1 EMC1072 Pin Description
PIN NUMBER
NAME
FUNCTION
TYPE
1
VDD
Power supply
Power
2
DP
External diode positive (anode)
connection
AIO
3
DN
External diode negative (cathode)
connection
AIO
THERM / ADDR
Active low Critical THERM output
signal - requires pull-up resistor to
set SMBus Address
OD (5V)
5
GND
Ground
Power
6
ALERT
Active low digital ALERT output
signal - requires pull-up resistor
OD (5V)
7
SMDATA
SMBus Data input/output
DIOD (5V)
8
SMCLK
SMBus Clock input
DI (5V)
4
The pin types are described below. All pins labelled with (5V) are 5V tolerant.
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.
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.
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1°C Temperature Sensor with Selectable Address
Datasheet
Chapter 3 Electrical Specifications
3.1
Absolute Maximum Ratings
Table 3.1 Absolute Maximum Ratings
DESCRIPTION
RATING
UNIT
Supply Voltage (VDD)
-0.3 to 4.0
V
Voltage on 5V tolerant pins (V5VT_pin)
-0.3 to 5.5
V
0 to 3.6
V
-0.3 to VDD +0.3
V
Operating Temperature Range
-40 to +125
°C
Storage Temperature Range
-55 to +150
°C
Voltage on 5V tolerant pins (|V5VT_pin - VDD|) (see Note 3.1)
Voltage on any other pin to Ground
Lead Temperature Range
Refer to JEDEC Spec. J-STD020
Package Thermal Characteristics for MSOP-8
Thermal Resistance (θj-a)
ESD Rating, All pins HBM
140.8
°C/W
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
SMSC EMC1072
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.
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1°C Temperature Sensor with Selectable Address
Datasheet
3.2
Electrical Specifications
Table 3.2 Electrical Specifications
VDD = 3.0V to 3.6V, TA = -40°C to 125°C, all typical values at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL
MIN
TYP
MAX
UNITS
CONDITIONS
DC Power
Supply Voltage
VDD
Supply Current
IDD
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
uA
> 16 conversions / sec, dynamic
averaging enabled
1120
Standby Supply Current
IDD
170
230
uA
Device in Standby mode, no SMBus
communications, ALERT and
THERM pins not asserted.
Power Up Time
tPUP
10
15
ms
Temp selection read
Note 3.2
Time to first data
available
tCONV_1
300
ms
Internal Temperature Monitor
Temperature Accuracy
±0.25
Temperature Resolution
±1
°C
-5°C < TA < 100°C
±2
°C
-40°C < TA < 125°C
0.125
°C
External Temperature Monitor
Temperature Accuracy
Temperature Resolution
±0.25
±1
°C
+20°C < TDIODE < +110°C
0°C < TA < 100°C
±0.5
±2
°C
-40°C < TDIODE < 127°C
0.125
°C
ms
EMC1072, default settings
nF
Connected across external diode
Conversion Time all
Channels
tCONV
190
Capacitive Filter
CFILTER
2.2
2.5
ALERT and THERM pins
Output Low Voltage
VOL
Leakage Current
ILEAK
Note 3.2
Revision 1.39 (10-11-10)
0.4
±5
V
ISINK = 8mA
uA
ALERT and THERM pins
Device powered or unpowered
TA < 85°C
pull-up voltage < 3.6V
The ALERT and THERM pins will not glitch low upon power up.
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1°C Temperature Sensor with Selectable Address
Datasheet
3.3
SMBus Electrical Characteristics
Table 3.3 SMBus Electrical Specifications
VDD = 3.0V to 3.6V, TA = -40°C to 125°C, all typical values are at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL
MIN
TYP
MAX
UNITS
CONDITIONS
SMBus Interface
Input High Voltage
VIH
2.0
VDD
V
5V Tolerant
Input Low Voltage
VIL
-0.3
0.8
V
5V Tolerant
Input High/Low Current
IIH / IIL
±5
uA
Powered or unpowered
TA < 85°C
Hysteresis
Input Capacitance
CIN
Output Low Sink Current
IOL
420
mV
5
pF
8.2
15
mA
SMDATA = 0.4V
SMBus Timing
Clock Frequency
fSMB
Spike Suppression
tSP
Bus free time Start to
Stop
tBUF
1.3
us
Hold Time: Start
tHD:STA
0.6
us
Setup Time: Start
tSU:STA
0.6
us
Setup Time: Stop
tSU:STP
0.6
us
Data Hold Time
tHD:DAT
0
us
Data Setup Time
tSU:DAT
100
ns
Clock Low Period
tLOW
1.3
us
Clock High Period
tHIGH
0.6
us
Clock/Data Fall time
tFALL
300
ns
Min = 20+0.1CLOAD ns
Clock/Data Rise time
tRISE
300
ns
Min = 20+0.1CLOAD ns
Capacitive Load
CLOAD
400
pF
per bus line
SMSC EMC1072
10
400
kHz
50
ns
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1°C Temperature Sensor with Selectable Address
Datasheet
Chapter 4 System Management Bus Interface Protocol
4.1
System Management Bus Interface Protocol
TheEMC1072 communicates with a host controller, such as an SMSC 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 Figure 4.1.
For the first 15ms after power-up the device may not respond to SMBus communications.
.
TLOW
THIGH
THD:STA
TSU:STO
TRISE
SMCLK
THD:STA
TFALL
THD:DAT
TSU:STA
TSU:DAT
SMDTA
TBUF
P
S
S
S - Start Condition
P - Stop Condition P
Figure 4.1 SMBus Timing Diagram
The EMC1072 is 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
DATA SENT TO
THE HOST
# of bits sent
Attempting to communicate with the EMC1072 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.
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
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1°C Temperature Sensor with Selectable Address
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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
location. No data is transferred during the Send Byte protocol as shown in Table 4.4.
Table 4.4 Send Byte Protocol
START
SLAVE
ADDRESS
WR
ACK
REGISTER
ADDRESS
ACK
STOP
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 Table 4.5.
Table 4.5 Receive Byte Protocol
START
SLAVE
ADDRESS
RD
ACK
REGISTER DATA
NACK
STOP
1 -> 0
1001_100
1
0
XXh
1
0 -> 1
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
START
ALERT
RESPONSE
ADDRESS
RD
ACK
DEVICE
ADDRESS
NACK
STOP
1 -> 0
0001_100
1
0
1001_1000
1
0 -> 1
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The EMC1072 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.
APPLICATION NOTE: The ARA does not clear the Status Register and if the MASK bit is cleared prior to the Status
Register being cleared, the ALERT pin will be reasserted.
4.7
SMBus Address
The EMC1072-A SMBus address is determined by the pull-up resistor on the THERM pin as shown
in Table 4.7.
The Address decode is performed by pulling known currents from VDD through the external resistor
causing the pin voltage to drop based on the respective current / resistor relationship. This pin voltage
is compared against a threshold that determines the value of the pull-up resistor.
Table 4.7 SMBus Address Decode
PULL UP RESISTOR
ON THERM PIN
SMBUS ADDRESS
4.7k
1111_100xb
6.8k
1011_100xb
10k
1001_100xb
15k
1101_100xb
22k
0011_100xb
33k
0111_100xb
The EMC1072 responds to hard-wired SMBus slave address as shown in Table 1.1, "Part Selection".
4.8
SMBus Timeout
The EMC1072 supports 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 6.11).
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1°C Temperature Sensor with Selectable Address
Datasheet
Chapter 5 Product Description
The EMC1072 is an SMBus temperature sensor. The EMC1072 monitors one internal diode and one
externally connected temperature diode.
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 EMC1072 and using
that data to control the speed of one or more fans.
The EMC1072 has 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 EMC1072 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 THERM
pin if the measured temperatures meet or exceed a second programmable limit.
Figure 5.1 shows a system level block diagram of the EMC1072.
EMC1072
CPU
Host
DP
Thermal
diode
SMCLK
DN
Internal
Diode
SMDATA
SMBus
Interface
ALERT
THERM
Power Control
Figure 5.1 System Diagram for EMC1072
5.1
Modes of Operation
The EMC1072 has two modes of operation.
5.1.1
„
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.
Conversion Rates
The EMC1072 may be configured for different conversion rates based on the system requirements.
The conversion rate is configured as described in Section 6.5, "Conversion Rate Register". The default
conversion rate is 4 conversions per second. Other available conversion rates are shown in Table 6.6,
"Conversion Rate".
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1°C Temperature Sensor with Selectable Address
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5.1.2
Dynamic Averaging
Dynamic averaging causes the EMC1072 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 Section 6.4, "Configuration Register"). When dynamic averaging is
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 Table 5.1 for the EMC1072.
Table 5.1 Supply Current vs. Conversion Rate for EMC1072
AVERAGE SUPPLY CURRENT
AVERAGING FACTOR (BASED ON
11-BIT OPERATION)
CONVERSION RATE
ENABLED
(DEFAULT)
DISABLED
ENABLED
(DEFAULT)
DISABLED
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
16x
1x
4 / sec (default)
950uA
510uA
8x
1x
8 / sec
1010uA
630uA
4x
1x
16 / sec
1020uA
775uA
2x
1x
32 / sec
1050uA
1050uA
1x
1x
64 / sec
1100uA
1100uA
0.5x
0.5x
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 THERM output is asserted. Once it has been
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 THERM pin is deasserted. Once the THERM pin is deasserted, the THERM
status bits will be automatically cleared.
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5.2.1
THERM Pin Considerations
Because of the decode method used to determine the SMBus Address it is important that the pull-up
resistance on THERM pin be within ±10% tolerance. Additionally, the pull-up resistor on the THERM
pin must be connected to the same 3.3V supply that drives the VDD pin.
For 15ms after power up, the THERM pin must not be pulled low or the SMBus Address will not be
decoded properly. If the system requirements do not permit these conditions, then the THERM pin must
be isolated from their respective busses during this time.
One method of isolating this pin is shown in Figure 5.2.
+3.3V
+2.5 - 5V
22K
VDD 1
4.7K 33K
DP1 2
DN1 3
THERM /
4
ADDR
Shared THERM
EMC1072
8
SMCLK
7
SMDATA
6
ALERT
5
GND
Figure 5.2 Isolating THERM Pin
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 output is selected via the
ALERT / COMP bit in the Configuration Register (see 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 (> high limit or < low limit) is detected on any diode or when a diode fault is detected.
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 ALERT pin will remain asserted until the appropriate status bits are
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 ALERT pin is masked will update the Status Register normally.
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 ALERT outputs can be hard-wired
together.
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 ALERT pin will remain asserted until
all temperatures drop below the corresponding high limit minus the THERM Hysteresis value.
SMSC EMC1072
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1°C Temperature Sensor with Selectable Address
Datasheet
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 ALERT pin is deasserted. Once the ALERT pin is
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 6.10) will prevent the respective channel from asserting the ALERT pin.
5.4
Programmable External Diode Ideality Factor
The EMC1072 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 EMC1072 provides a 6-bit register for each external diode where
the ideality factor of the diode used is programmed to eliminate errors across all temperatures.
5.5
Diode Faults
The EMC1072 detects 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 5.6,
"Consecutive Alerts") 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 VDD to DP, or a short from VDD to DN.
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.
5.6
Consecutive Alerts
The EMC1072 contains 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 ALERT and THERM 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 6.11 for more details on the consecutive alert function.
5.7
Digital Filter
To reduce the effect of noise and temperature spikes on the reported temperature, the External Diode
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 Figure 5.3, "Temperature Filter Step Response"
and Figure 5.4, "Temperature Filter Impulse Response".
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1°C Temperature Sensor with Selectable Address
Datasheet
Filter Step Response
Temperature (C)
90
Disabled
80
70
Level1
Level2
60
50
40
30
20
10
0
0
2
4
6
8
10
12
14
Samples
Figure 5.3 Temperature Filter Step Response
Filter Impulse Response
90
Temperature (C)
80
Disabled
70
60
50
Level1
40
Level2
30
20
10
0
0
2
4
6
8
10
12
14
Samples
Figure 5.4 Temperature Filter Impulse Response
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1°C Temperature Sensor with Selectable Address
Datasheet
5.8
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 ΔVBE is proportional to absolute temperature
as shown in the following equation:
where:
Δ V BE =
η kT
q
⎛ I
ln ⎜⎜ HIGH
⎝ I LOW
⎞
⎟⎟
⎠
k = Boltzmann’s constant
T = absolute temperature in Kelvin
[1]
q = electron charge
η = diode ideality factor
5.9
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 EMC1072 has 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 5.2, "EMC1072 Temperature Data Format" shows the default and extended range formats.
Table 5.2 EMC1072 Temperature Data Format
TEMPERATURE (°C)
Diode Fault
DEFAULT RANGE 0°C TO 127°C
EXTENDED RANGE RANGE -64°C
TO 191°C
000 0000 0000
000 0000 0000
000 0000 0000
000 0000 0000
Note 5.2
-1
000 0000 0000
001 1111 1111b
0
000 0000 0000
Note 5.1
010 0000 0000
0.125
000 0000 0001
010 0000 0001
1
000 0000 1000
010 0000 1000
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
110 0000 0000
-64
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1°C Temperature Sensor with Selectable Address
Datasheet
Table 5.2 EMC1072 Temperature Data Format (continued)
TEMPERATURE (°C)
DEFAULT RANGE 0°C TO 127°C
EXTENDED RANGE RANGE -64°C
TO 191°C
190
011 1111 1111
111 1111 0000
191
011 1111 1111
111 1111 1000
>= 191.875
011 1111 1111
111 1111 1111
Note 5.4
5.10
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.
External Diode Connections
The EMC1072 can be configured to measure a discrete 2N3904 diode-connected transistor or an AMD
processor diode. The diode can be connected as shown in Figure 5.5, "Diode Configurations".
to DP
to DP
to DN
to DN
Local Ground
Typical remote
substrate transistor
e.g. CPU substrate PNP
Typical remote
discrete NPN transistor
e.g. 2N3904
Figure 5.5 Diode Configurations
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1°C Temperature Sensor with Selectable Address
Datasheet
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
DEFAULT
VALUE
00h
R
Internal Diode Data
High Byte
Stores the integer data for the
Internal Diode
01h
R
External Diode Data
High Byte
Stores the integer data for the
External Diode
00h
02h
R-C
Status
Stores status bits for the Internal
Diode and External Diodes
00h
Page 24
03h
R/W
Configuration
Controls the general operation of
the device (mirrored at address
09h)
18h
Page 25
04h
R/W
Conversion Rate
Controls the conversion rate for
updating temperature data
(mirrored at address 0Ah)
06h
(4/sec)
Page 26
05h
R/W
Internal Diode High
Limit
Stores the 8-bit high limit for the
Internal Diode (mirrored at address
0Bh)
55h
(85°C)
06h
R/W
Internal Diode Low
Limit
Stores the 8-bit low limit for the
Internal Diode (mirrored at address
0Ch)
00h
(0°C)
55h
(85°C)
PAGE
00h
Page 24
Page 27
07h
R/W
External Diode High
Limit High Byte
Stores the integer portion of the
high limit for the External Diode
(mirrored at register 0Dh)
08h
R/W
External Diode Low
Limit High Byte
Stores the integer portion of the
low limit for the External Diode
(mirrored at register 0Eh)
00h
(0°C)
09h
R/W
Configuration
Controls the general operation of
the device (mirrored at address
03h)
00h
Page 25
0Ah
R/W
Conversion Rate
Controls the conversion rate for
updating temperature data
(mirrored at address 04h)
06h
(4/sec)
Page 26
Revision 1.39 (10-11-10)
22
DATASHEET
SMSC EMC1072
1°C Temperature Sensor with Selectable Address
Datasheet
Table 6.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
0Bh
R/W
Internal Diode High
Limit
Stores the 8-bit high limit for the
Internal Diode (mirrored at address
05h)
55h
(85°C)
0Ch
R/W
Internal Diode Low
Limit
Stores the 8-bit low limit for the
Internal Diode (mirrored at address
06h)
00h
(0°C)
0Dh
R/W
External Diode High
Limit High Byte
Stores the integer portion of the
high limit for the External Diode
(mirrored at register 07h)
55h
(85°C)
0Eh
R/W
External Diode Low
Limit High Byte
Stores the integer portion of the
low limit for the External Diode
(mirrored at register 08h)
00h
(0°C)
0Fh
W
One shot
A write to this register initiates a
one shot update.
00h
Page 28
10h
R
External Diode Data
Low Byte
Stores the fractional data for the
External Diode
00h
Page 24
11h
R/W
Scratchpad
Scratchpad register for software
compatibility
00h
Page 27
12h
R/W
Scratchpad
Scratchpad register for software
compatibility
00h
Page 27
13h
R/W
External Diode High
Limit Low Byte
Stores the fractional portion of the
high limit for the External Diode
00h
14h
R/W
External Diode Low
Limit Low Byte
Stores the fractional portion of the
low limit for the External Diode
00h
19h
R/W
External Diode
THERM Limit
Stores the 8-bit critical temperature
limit for the External Diode
55h
(85°C)
Page 28
1Fh
R/W
Channel Mask
Register
Controls the masking of individual
channels
00h
Page 28
20h
R/W
Internal Diode
THERM Limit
Stores the 8-bit critical temperature
limit for the Internal Diode
55h
(85°C)
0Ah
(10°C)
PAGE
Page 27
Page 27
Page 28
21h
R/W
THERM Hysteresis
Stores the 8-bit hysteresis value
that applies to all THERM limits
22h
R/W
Consecutive ALERT
Controls the number of out-of-limit
conditions that must occur before
an interrupt is asserted
70h
Page 29
27h
R/W
External Diode 1
Ideality Factor
Stores the ideality factor for
External Diode 1
12h
(1.008)
Page 30
29h
R
Internal Diode Data
Low Byte
Stores the fractional data for the
Internal Diode
00h
Page 24
40h
R/W
Filter Control
Controls the digital filter setting for
the External Diode channel
00h
Page 31
FDh
R
Product ID
Stores a fixed value that identifies
each product
Table 6.18
Page 32
SMSC EMC1072
23
DATASHEET
Revision 1.39 (10-11-10)
1°C Temperature Sensor with Selectable Address
Datasheet
Table 6.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
FEh
R
SMSC ID
FFh
R
Revision
6.1
DEFAULT
VALUE
PAGE
Stores a fixed value that
represents SMSC
5Dh
Page 32
Stores a fixed value that
represents the revision number
03h
Page 32
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
Internal Diode
High Byte
128
64
32
16
8
4
2
1
00h
29h
R
Internal Diode
Low Byte
0.5
0.25
0.125
-
-
-
-
-
00h
01h
R
External Diode
High Byte
128
64
32
16
8
4
2
1
00h
10h
R
External Diode
Low Byte
0.5
0.25
0.125
-
-
-
-
-
00h
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.
6.3
Status Register
Table 6.3 Status Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
02h
R-C
Status
BUSY
IHIGH
ILOW
EHIGH
ELOW
FAULT
ETHERM
ITHERM
00h
The Status Register reports the operating status of the Internal Diode and External Diode 1 channels.
When any of the bits are set (excluding the BUSY bit) either the ALERT or THERM pin is being
asserted.
The ALERT and THERM pins are controlled by the respective consecutive alert counters (see
Section 6.11) and will not be asserted until the programmed consecutive alert count has been reached.
The status bits (except ETHERM and ITHERM) will remain set until read unless the ALERT pin is
configured as a second THERM output (see Section 5.3.2).
Revision 1.39 (10-11-10)
24
DATASHEET
SMSC EMC1072
1°C Temperature Sensor with Selectable Address
Datasheet
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 6 - IHIGH - This bit is set when the Internal Diode channel exceeds its programmed high limit.
When set, this bit will assert the ALERT pin.
Bit 5 - ILOW - This bit is set when the Internal Diode channel drops below its programmed low limit.
When set, this bit will assert the ALERT pin.
Bit 4 - EHIGH - This bit is set when the External Diode channel exceeds its programmed high limit.
When set, this bit will assert the ALERT pin.
Bit 3 - ELOW - This bit is set when the External Diode channel drops below its programmed low limit.
When set, this bit will assert the ALERT pin.
Bit 2 - FAULT - This bit is asserted when a diode fault is detected. When set, this bit will assert the
ALERT pin.
Bit 1 - ETHERM - This bit is set when the External Diode channel exceeds the programmed THERM
limit. When set, this bit will assert the THERM pin. This bit will remain set until the THERM pin is
released at which point it will be automatically cleared.
Bit 0 - ITHERM - This bit is set when the Internal Diode channel exceeds the programmed THERM
limit. When set, this bit will assert the THERM pin. This bit will remain set until the THERM pin is
released at which point it will be automatically cleared.
6.4
Configuration Register
Table 6.4 Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
R/W
Configuration
MASK_
ALL
RUN /
STOP
ALERT/
COMP
1
1
RANGE
DAVG_
DIS
-
18h
03h
09h
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 THERM pin. The Status Register will be updated normally.
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.
Bit 5 - ALERT/COMP - Controls the operation of the ALERT pin.
„
‘0’ (default) - The ALERT pin acts in interrupt mode as described in Section 5.3.1, "ALERT Pin
Interrupt Mode".
„
‘1’ - The ALERT pin acts in comparator mode as described in Section 5.3.2, "ALERT Pin
Comparator Mode". In this mode the MASK_ALL bit is ignored.
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 5.2, "EMC1072 Temperature Data Format").
SMSC EMC1072
25
DATASHEET
Revision 1.39 (10-11-10)
1°C Temperature Sensor with Selectable Address
Datasheet
Bit 1 - DAVG_DIS - Disables the dynamic averaging feature on all temperature channels.
6.5
„
‘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, "Supply
Current vs. Conversion Rate for EMC1072".
„
‘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.
Conversion Rate Register
Table 6.5 Conversion Rate Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
R/W
Conversion
Rate
-
-
-
-
04h
0Ah
B3
B2
B1
B0
DEFAULT
06h
(4/sec)
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, "Conversion Rate".
Table 6.6 Conversion Rate
CONV[3:0]
HEX
3
2
1
0
CONVERSIONS / SECOND
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
9h
1
0
0
1
32
Ah
1
0
1
0
64
Bh - Fh
Revision 1.39 (10-11-10)
All others
1
26
DATASHEET
SMSC EMC1072
1°C Temperature Sensor with Selectable Address
Datasheet
6.6
Limit Registers
Table 6.7 Temperature Limit Registers
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
R/W
Internal Diode
High Limit
128
64
32
16
8
4
2
1
55h
(85°C)
R/W
Internal Diode
Low Limit
128
64
32
16
8
4
2
1
00h
(0°C)
R/W
External
Diode High
Limit High
Byte
128
64
32
16
8
4
2
1
55h
(85°C)
R/W
External
Diode High
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
R/W
External
Diode Low
Limit High
Byte
128
64
32
16
8
4
2
1
00h
(0°C)
R/W
External
Diode Low
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
05h
0Bh
06h
0Ch
07h
0Dh
13h
08h
0Eh
14h
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 Section 6.4).
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.
SMSC EMC1072
27
DATASHEET
Revision 1.39 (10-11-10)
1°C Temperature Sensor with Selectable Address
Datasheet
6.8
One Shot Register
Table 6.9 One Shot Register
ADDR.
R/W
REGISTER
0Fh
W
One Shot
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Writing to this register initiates a single conversion cycle. Data
is not stored and always reads 00h
00h
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.
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
External
Diode THERM
Limit
128
64
32
16
8
4
2
1
55h
(85°C)
20h
R/W
Internal Diode
THERM Limit
128
64
32
16
8
4
2
1
55h
(85°C)
21h
R/W
THERM
Hysteresis
128
64
32
16
8
4
2
1
0Ah
(10°C)
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 THERM pin is asserted. The limit
setting must match the chosen data format of the temperature reading registers.
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
Channel Mask Register
Table 6.11 Channel Mask Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
1Fh
R/W
Channel
Mask
-
-
-
-
-
-
E
MASK
INT
MASK
00h
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 1 - EMASK - Masks the ALERT pin from asserting when the External Diode channel is out of limit
or reports a diode fault.
„
‘0’ (default) - The External Diode channel will cause the ALERT pin to be asserted if it is out of
limit or reports a diode fault.
Revision 1.39 (10-11-10)
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DATASHEET
SMSC EMC1072
1°C Temperature Sensor with Selectable Address
Datasheet
„
‘1’ - The External Diode channel will not cause the ALERT pin to be asserted if it is out of limit or
reports a diode fault.
Bit 0 - INTMASK - Masks the ALERT pin from asserting when the Internal Diode temperature is out
of limit.
6.11
„
‘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.
Consecutive ALERT Register
Table 6.12 Consecutive ALERT Register
ADDR.
R/W
REGISTER
B7
22h
R/W
Consecutive
ALERT
TIME
OUT
B6
B5
B4
CTHRM[2:0]
B3
B2
B1
CALRT[2:0]
B0
DEFAULT
-
70h
The Consecutive ALERT Register determines how many times an out-of-limit error or diode fault must
be detected in consecutive measurements before the ALERT or THERM pin is asserted. Additionally,
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. EHIGH) will be set to ‘1’, the ALERT pin will be 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 ALERT pin will be
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, the high limits are set at 70°C,
and none of the channels are masked, then the ALERT pin will be asserted after the following four
measurements:
1. Internal Diode reads 71°C and the external diode reads 69°C. Consecutive alert counter for INT is
incremented to 1.
2. Both the Internal Diode and the External Diode read 71°C. Consecutive alert counter for INT is
incremented to 2 and for EXT is set to 1.
3. The External Diode reads 71°C and the Internal Diode reads 69°C. Consecutive alert counter for
INT is cleared and EXT is incremented to 2.
4. The Internal Diode reads 71°C and the external diode reads 71°C. Consecutive alert counter for
INT is set to 1 and EXT is incremented to 3.
5. The Internal Diode reads 71°C and the external diode reads 71°C. Consecutive alert counter for
INT is incremented to 2 and EXT is incremented to 4. The appropriate status bits are set for EXT
and the ALERT pin is asserted. EXT 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.
SMSC EMC1072
29
DATASHEET
Revision 1.39 (10-11-10)
1°C Temperature Sensor with Selectable Address
Datasheet
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 Table 6.13. 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 ALERT pin is asserted. All temperature channels use this value
to set the respective counters. The bits are decoded as shown in Table 6.13. The default setting is 1
consecutive out of limit conversion.
Table 6.13 Consecutive Alert / THERM Settings
NUMBER OF CONSECUTIVE OUT OF LIMIT
MEASUREMENTS
2
1
0
0
0
0
1
(default for CALRT[2:0])
0
0
1
2
0
1
1
3
1
1
1
4
(default for CTHRM[2:0])
6.12
External Diode Ideality Factor Registers
Table 6.14 Ideality Configuration Registers
ADDR.
R/W
REGISTER
B7
B6
27h
R/W
External
Diode 1
Ideality
Factor
-
-
B5
B4
B3
B2
B1
IDEALITY[5:0]
B0
DEFAULT
12h
These registers store the ideality factors that are applied to the external diodes. Table 6.15 defines
each setting and the corresponding ideality factor.
Table 6.15 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
Revision 1.39 (10-11-10)
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DATASHEET
SMSC EMC1072
1°C Temperature Sensor with Selectable Address
Datasheet
Table 6.15 Ideality Factor Look-Up Table (Diode Model) (continued)
SETTING
FACTOR
SETTING
FACTOR
SETTING
FACTOR
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
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
6.13
Filter Control Register
Table 6.16 Filter Configuration Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
40h
R/W
Filter Control
-
-
-
-
-
-
B1
B0
FILTER[1:0]
DEFAULT
00h
The Filter Configuration Register controls the digital filter on the External Diode channel.
Bits 1-0 - FILTER[1:0] - Control the level of digital filtering that is applied to the External Diode
temperature measurements. See Figure 5.3, "Temperature Filter Step Response" and Figure 5.4,
"Temperature Filter Impulse Response" for examples on the filter behavior.
Table 6.17 Filter Settings
FILTER[1:0]
1
0
0
0
Disabled (default)
0
1
Level 1
1
0
Level 1
1
1
Level 2
SMSC EMC1072
AVERAGING
31
DATASHEET
Revision 1.39 (10-11-10)
1°C Temperature Sensor with Selectable Address
Datasheet
6.14
Product ID Register
Table 6.18 Product ID Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
FDh
R
Product ID
EMC1072
0
0
1
0
0
0
0
0
20h
The Product ID Register holds a unique value that identifies the device.
6.15
SMSC ID Register (FEh)
Table 6.19 Manufacturer ID Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
FEh
R
SMSC ID
0
1
0
1
1
1
0
1
5Dh
The Manufacturer ID register contains an 8 bit word that identifies the SMSC as the manufacturer of
the EMC1072.
6.16
Revision Register (FFh)
Table 6.20 Revision Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
FFh
R
Revision
0
0
0
0
0
0
1
1
03h
The Revision register contains an 8 bit word that identifies the die revision.
Revision 1.39 (10-11-10)
32
DATASHEET
SMSC EMC1072
1°C Temperature Sensor with Selectable Address
Datasheet
Chapter 7 Typical Operating Curves
Tem perature Error vs. Am bient Tem perature
(2N3904, TDIODE = 42.5°C, VDD = 3.3V)
1.0
1.0
0.8
0.8
0.6
Temperature Error (°C)
0.5
0.3
0.0
-0.3
-0.5
-0.8
-1.0
3000
-1.0
-40 -25 -10
5
20 35 50 65 80
Am bient Tem perature (°C)
95 110 125
S u p p l y C u r r e n t v s. C o n v e r si o n R a te
Tem perature Error vs. External Diode Tem perature
(2N3904, TA = 42.5°C, VDD = 3.3V)
1200
1100
1000
900
Supply Current (uA
800
D y n a m ic
A v e r a g in g
En a b le d
700
D y n a m ic
A v e r a g in g
D is a b le d
600
500
400
110 125
300
64
32
8
16
4
2
1
4
1
2
200
/1
6
Temperature Error (°C)
-0.6
-0.8
4000
Filter Capacitor (pF)
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-40 -25 -10 5
20 35 50 65 80 95
External Diode Tem perature (°C)
-0.4
1/
2000
0.0
-0.2
8
1000
0.2
1/
0
0.4
1/
Temperature Error (°C)
Tem perature Error vs. Filter Capacitor
(2N3904, TA = 27°C, TDIODE = 27°C, VDD = 3.3V)
C o n v e r si o n R a te
SMSC EMC1072
33
DATASHEET
Revision 1.39 (10-11-10)
D
PIN 1 IDENTIFIER
AREA (D/2 X E1/2)
e
3
DESCRIPTION
-
DATE
RELEASED BY
-
-
SEE SPEC FRONT PAGE FOR REVISION HISTORY
Revision 1.39 (10-11-10)
REVISION HISTORY
REVISION
3
5
c
E
E1
SEE DETAIL "A"
2 8X b
TOP VIEW
34
DATASHEET
END VIEW
A2
A
C
SEATING PLANE
A1
ccc C
SIDE VIEW
3-D VIEW
H
C
NOTES:
1. ALL DIMENSIONS ARE IN MILLIMETER.
2. TOLERANCE ON THE TRUE POSITION OF THE LEADS IS ± 0.065mm MAXIMUM.
3. PACKAGE BODY DIMENSIONS "D" AND "E1" DO NOT INCLUDE MOLD PROTRUSIONS OR FLASH.
MAXIMUM MOLD PROTRUSIONS OR FLASH IS 0.15 mm (0.006 INCHES) PER END AND SIDE.
DIMENSIONS "D" AND "E1" ARE DETERMINED AT DATUM PLANE "H".
4. DIMENSION FOR FOOT LENGTH "L" IS MEASURED AT THE GAUGE PLANE 0.25mm ABOVE THE
SEATING PLANE.
5. DETAILS OF PIN 1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE
INDICATED.
GAUGE PLANE
0.25
SEATING PLANE
0° - 8°
4
L
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN MILLIMETERS
AND TOLERANCES ARE:
L1
DECIMAL
X.X
±0.1
X.XX ±0.05
X.XXX ±0.025
THIRD ANGLE PROJECTION
80 ARKAY DRIVE
HAUPPAUGE, NY 11788
USA
ANGULAR
±1°
TITLE
DETAIL "A"
NAME
DATE
S.K.ILIEV
7/05/04
DIM AND TOL PER ASME Y14.5M - 1994
MATERIAL
-
SCALE: 3/1
FINISH
-
CHECKED
S.K.ILIEV
S.K.ILIEV
Figure 8.1 8-Pin MSOP / TSSOP Package
REV
DWG NUMBER
MO-8-TSSOP-3x3
7/05/04
APPROVED
PRINT WITH "SCALE TO FIT"
DO NOT SCALE DRAWING
PACKAGE OUTLINE
8 PIN TSSOP, 3x3 MM BODY, 0.65 MM PITCH
DRAWN
SCALE
7/07/04
STD COMPLIANCE
1:1
JEDEC: MO-187 / D
D
SHEET
1 OF 1
SMSC EMC1072
Datasheet
1°C Temperature Sensor with Selectable Address
Chapter 8 Package Information
1°C Temperature Sensor with Selectable Address
Datasheet
8.1
Package Markings
TOP
LINE: 1-T – Device Number
LINE: 2-T Version, Revision, Country Code (VRCC)
1 0
7 2
2x 1.5pt
X R C C
e3
PB-FREE/GREEN SYMBOL
(Matte Sn)
ALL TOP LINES CENTER
HORIZONTAL ALIGNMENT
PIN 1
BOTTOM
PIN 1
LINE: 1-B – Date Code (YYWW)
Y Y WW
LINE: 2-B – First 3 Digits of Lot Number
1 2 3
LINE: 3-B – Last 4 Digits of Lot Number
4 5 6 a
3x 1.5pt
Figure 8.2 EMC1072 Package Markings
SMSC EMC1072
35
DATASHEET
Revision 1.39 (10-11-10)
1°C Temperature Sensor with Selectable Address
Datasheet
Chapter 9 Datasheet Revision History
Table 9.1 Customer Revision History
REVISION LEVEL & DATE
SECTION/FIGURE/ENTRY
CORRECTION
Revision 1.39 (10-11-10)
Cover
Updated temperature accuracy information to
match Table 3.2, "Electrical Specifications".
Revision 1.38 (03-25-10)
Table 3.2, "Electrical
Specifications"
Changed Data Hold Time to 0.
Note following Electrical Specifications table
changed from: “During the power up time, SMBus
communication is permitted, however the THERM
pin must be pulled low.”
To: “The ALERT and THERM pins will not glitch
low upon power up.”
Figure 5.1, "System
Diagram for EMC1072"
Changed figure to remove 2-port diode and
replace with transistor diode.
Section 5.10, "External
Diode Connections"
Updated diode connections text.
Figure 5.5, "Diode
Configurations"
Updated diode figure.
Rev. 1.37 (12-22-09)
Section 6.16, "Revision
Register (FFh)"
Changed default from 01h to 03h to match the
actual value.
Rev. 1.36 (10-21-09)
Table 6.17, "Filter Settings"
Added table for bit decode.
Rev. 1.35 (06-12-09)
Table 2.1, "EMC1072 Pin
Description"
Identified 5V tolerant pins. Added the following
application note below table: “For the 5V tolerant
pins that have a pull-up resistor (SMCLK,
SMDATA, THERM, ALERT), the voltage difference
between VDD and the pull-up voltage must never
exceed 3.6V.”
Table 3.1, "Absolute
Maximum Ratings"
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, THERM, ALERT), the pull-up voltage
must not exceed 3.6V when the device is
unpowered.”
Table 3.2, "Electrical
Specifications"
Rev. 1.34 (12-02-08)
Revision 1.39 (10-11-10)
Added leakage current.
Initial release
36
DATASHEET
SMSC EMC1072
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