EMC1046 DATA SHEET (06/29/2009) DOWNLOAD

EMC1046/EMC1047
1°C Multiple Temperature
Sensor with Beta
Compensation and
Hottest of Thermal Zones
PRODUCT FEATURES
Datasheet
General Description
Features
The EMC1046/EMC1047are high accuracy, low cost,
System Management Bus (SMBus) temperature
sensors. Advanced features such as Resistance Error
Correction (REC), Beta Compensation (to CPU diodes
requiring the BJT or transistor model) 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 EMC1046/EMC1047 monitor up to
seven temperature channels (up to six external and one
internal).
Applications
„
„
„
„
„
„
„
Designed to support 45nm, 65nm, and 90nm CPU
diodes
Supports diodes requiring the BJT or transistor model
Resistance Error Correction (up to 100 Ohms)
Up to six External Temperature Monitors
—
—
—
—
±1°C Accuracy (60°C < TDIODE < 100°C)
0.125°C Resolution
Supports up to 2.2nF filter capacitor
Anti-parallel diodes for extra diode support and
compact design
„
Internal Temperature Monitor
„
3.3V Supply Voltage
Available in a 10-pin TSSOP lead-free RoHS
Compliant package
— ±2°C accuracy
„
Notebook Computers
Desktop Computers
Industrial
Embedded Applications
Block Diagram
DP1 / DN6*
DN1 / DP6*
DP2 / DN3
DN2 / DP3
DN4 / DP5
SMCLK
External
Temp
Diodes
SMDATA
Analog
Mux
DP4 / DN5
Antiparallel
diode
11 bit Σ Δ
ADC
Temp Registers
SMBus
Slave
Protocol
Hottest of Comparison
Internal
Temp
Diode
* denotes EMC1047 only
SMSC EMC1046/EMC1047
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
ORDER NUMBERS:
ORDERING NUMBER
PACKAGE
FEATURES
DIODE MODES
SUPPORTED
SMBUS
ADDRESS
EMC1046-1-AIZL-TR
10-pin TSSOP
(Lead-Free RoHS
Compliant)
Up to 5 external diodes. “Hottest Of”
temperature comparison
Intel CPU,
3904, AMD with
setup
1001_100(r/w)
EMC1046-6-AIZL-TR
10-pin TSSOP
(Lead-Free RoHS
Compliant)
Up to 5 external diodes. “Hottest Of”
temperature comparison
Intel CPU,
3904, AMD with
setup
1001_101(r/w)
EMC1047-1-AIZL-TR
10-pin TSSOP
(Lead-Free RoHS
Compliant)
Up to 6 external diodes. “Hottest Of”
temperature comparison
Intel CPU,
3904, AMD with
setup
1001_100(r/w)
EMC1047-2-AIZL-TR
10-pin TSSOP
(Lead-Free RoHS
Compliant)
Up to 6 external diodes. “Hottest Of”
temperature comparison
Intel CPU,
3904, AMD with
setup
1001_000(r/w)
Reel Size is 4,000 pieces
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123
Copyright © 2009 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 0.69 (06-29-09)
2
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Table of Contents
Chapter 1 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1
2.2
2.3
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SMBus Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chapter 3 System Management Bus Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1
3.2
3.3
3.4
3.5
3.6
3.7
System Management Bus Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Write Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Read Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Send Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receive Byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12
13
13
13
13
13
Chapter 4 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1
4.2
4.3
Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.1
Resistance Error Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.2
Beta Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.3
Digital Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.4
“Hottest Of” Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.5
Conversion Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.6
Dynamic Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diode Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.1
Diode Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
15
15
15
15
15
16
16
16
17
Chapter 5 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
5.14
5.15
5.16
5.17
5.18
5.19
5.20
5.21
Data Read Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conversion Rate Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
One Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Diode Fault Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Consecutive ALERT Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Beta Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hottest Temperature Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hottest Temperature Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REC Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hottest Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Channel Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manufacturer ID Register (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision Register (FFh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMSC EMC1046/EMC1047
3
DATASHEET
22
22
23
24
24
25
27
28
28
29
30
31
31
32
32
33
33
34
34
35
35
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Chapter 6 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.1
6.2
EMC1046/EMC1047 Package Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.2.1
EMC1046-X-AIZL (10-Pin TSSOP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Chapter 7 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Revision 0.69 (06-29-09)
4
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
List of Figures
Figure 1.1
Figure 3.1
Figure 4.1
Figure 4.2
Figure 6.1
EMC1046/EMC1047 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System Diagram for EMC1046/EMC1047 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Diode Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
10-Pin TSSOP Package Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
SMSC EMC1046/EMC1047
5
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
List of Tables
Table 1.1 EMC1046/EMC1047 Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 1.2 Pin Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 2.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2.3 SMBus Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 3.1 Protocol Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 3.2 Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 3.3 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 3.4 Send Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 3.5 Receive Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4.1 Supply Current vs. Conversion Rate for EMC1046/EMC1047 . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 5.1 Register Set in Hexadecimal Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 5.2 Temperature Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 5.3 Temperature Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 5.4 Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 5.5 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 5.6 Conversion Rate Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 5.7 Conversion Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 5.8 Maximum Conversion Rate Per Temperature Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 5.9 Temperature Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 5.10 One Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 5.11 External Diode Fault Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 5.12 Consecutive ALERT Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 5.13 Consecutive Alert Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 5.14 Beta Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 5.15 Beta Compensation Look Up Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 5.16 Hottest Temperature Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 5.17 Hottest Temperature Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 5.18 High Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 5.19 Low Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 5.20 REC Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 5.21 Hottest Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 5.22 Channel Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 5.23 Filter Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 5.24 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 5.25 Manufacturer ID Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 5.26 Revision Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 7.1 Customer Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Revision 0.69 (06-29-09)
6
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Chapter 1 Pin Description
VDD
1
10
SMCLK
DP1 / DN6*
2
9
SMDATA
DN1 / DP6*
3
8
DP4 / DN5
DP2 / DN3
4
7
DN4 / DP5
DN2 / DP3
5
6
GND
EMC1046 / 7
10 TSSOP
* denote EMC1047 only
Figure 1.1 EMC1046/EMC1047 Pin Diagram
Table 1.1 EMC1046/EMC1047 Pin Description
PIN NUMBER
NAME
FUNCTION
TYPE
1
VDD
Power supply
Power
2
DP1 / DN6*
DP1 - External Diode 1 positive
(anode) connection (EMC1046)
AIO
DP1 / DN6 - External Diode 1
positive (anode) connection and
External Diode 6 negative (cathode)
connection (EMC1047)
3
DN1 / DP6*
DN1 - External diode 1 negative
(cathode) connection (EMC1046)
AIO
DN1 / DP6* - External diode 1
negative (cathode) connection and
External Diode 6 positive (anode)
connection (EMC1047)
4
DP2 / DN3
External Diode 2 positive (anode)
connection and External Diode 3
negative (cathode) connection
AIO
5
DN2 / DP3
External diode 2 negative (cathode)
connection and External Diode 3
positive (anode) connection
AIO
6
GND
Ground Connection
Power
7
DN4 / DP5
External diode 4 negative (cathode)
connection and External Diode 5
positive (anode) connection
AIO
SMSC EMC1046/EMC1047
7
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Table 1.1 EMC1046/EMC1047 Pin Description (continued)
PIN NUMBER
NAME
FUNCTION
TYPE
8
DP4 / DN5
External Diode 4 positive (anode)
connection and External Diode 5
negative (cathode) connection
AIO
9
SMDATA
SMBus Data input/output - requires
external pullup resistor
DIOD (5V)
10
SMCLK
SMBus Clock input - requires
external pullup resistor
DI (5V)
The pin types are described below. All pins labelled (5V) are 5V tolerant.
APPLICATION NOTE: For the 5V tolerant pins that have a pull-up resistor, the voltage difference between VDD and
the pull-up voltage must never exceed 3.6V.
Table 1.2 Pin Type
PIN TYPE
Power
FUNCTION
Used to supply either VDD or GND to the device
DI
5V tolerant digital input
OD
5V tolerant Open drain digital output. Requires a pull-up resistor
DIOD
AIO
Revision 0.69 (06-29-09)
5V tolerant bi-directional digital input / open-drain output. Requires a pull-up
resistor.
Analog input / output used for external diodes or analog inputs
8
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Chapter 2 Electrical Specifications
2.1
Absolute Maximum Ratings
Table 2.1 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
Voltage on 5V tolerant pins (|V5VT_pin - VDD|) (see Note 2.1)
-0.3 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 any other pin to Ground
Lead Temperature Range
Refer to JEDEC Spec. J-STD020
Package Thermal Characteristics for MSOP-10
Thermal Resistance (θj-a)
ESD Rating, All pins HBM
132.2
°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 2.1
2.2
For the 5V tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed
3.6V when the device is unpowered.
Electrical Specifications
Table 2.2 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
Supply Current
SMSC EMC1046/EMC1047
3.0
3.3
3.6
V
IDD
395
450
uA
1 conversion / sec, dynamic
averaging disabled
IDD
700
960
uA
4 conversions / sec, dynamic
averaging enabled
9
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Table 2.2 Electrical Specifications (continued)
VDD = 3.0V to 3.6V, TA = -40°C to 125°C, all typical values at TA = 27°C unless otherwise noted.
CHARACTERISTIC
Standby Supply Current
SYMBOL
MIN
ISTBY
TYP
MAX
200
UNITS
uA
CONDITIONS
RUN / STOP bit set. Monitoring
disabled.
Internal Temperature Monitor
Temperature Accuracy
±0.25
Temperature Resolution
±1
°C
0°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
+40°C < TDIODE < +110°C
0°C < TA < 110°C
±0.5
±2
°C
-40°C < TDIODE < 127°C
0.125
°C
ms
default settings
2.7
nF
Connected across external diode
Conversion Time all
Channels
tCONV
190
Capacitive Filter
CFILTER
2.2
Resistance Error
Correction
RSERIES
100
Ω
In series with DP and DN lines
Leakage Current
ILEAK
±5
uA
powered or unpowered
TA < 85°C
Power Up Timing
First conversion ready
tCONV_f
300
ms
Time after power up before all
channels updated with valid data
SMBus delay
tSMB_d
15
ms
Delay before SMBus
communications should be sent by
host
2.3
SMBus Electrical Characteristics
Table 2.3 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
Revision 0.69 (06-29-09)
420
mV
10
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Table 2.3 SMBus Electrical Specifications (continued)
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
Input Capacitance
CIN
Output Low Sink Current
IOL
MIN
TYP
MAX
5
UNITS
CONDITIONS
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
0.3
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
fSMB > 100kHz
Clock/Data Rise time
tRISE
1000
ns
Min = 20+0.1CLOAD ns
fSMB < 100kHz
Capacitive Load
CLOAD
400
pF
per bus line
SMSC EMC1046/EMC1047
10
400
kHz
50
ns
11
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Chapter 3 System Management Bus Interface Protocol
3.1
System Management Bus Interface Protocol
The EMC1046/EMC1047 communicate 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 3.1.
TLOW
THIGH
THD:STA
TSU:STO
TRISE
SMCLK
THD:STA
TFALL
THD:DAT
TSU:STA
TSU:DAT
SMDATA
TBUF
P
S
S
S - Start Condition
P - Stop Condition P
Figure 3.1 SMBus Timing Diagram
The EMC1046/EMC1047 are SMBus 2.0 compatible and support Send Byte, Read Byte, Write Byte,
and Receive Byte, as valid protocols as shown below.
All of the below protocols use the convention in Table 3.1.
Table 3.1 Protocol Format
DATA SENT
TO DEVICE
DATA SENT TO
THE HOST
Attempting to communicate with the EMC1046/EMC1047 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.
3.2
Write Byte
The Write Byte is used to write one byte of data to the registers as shown below Table 3.2:
Table 3.2 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
Revision 0.69 (06-29-09)
12
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
3.3
Read Byte
The Read Byte protocol is used to read one byte of data from the registers as shown in Table 3.3.
Table 3.3 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
0
XXh
0
0 -> 1
1001_100
1
0
XXh
1
0 -> 1
3.4
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 3.4.
Table 3.4 Send Byte Protocol
START
SLAVE
ADDRESS
WR
ACK
REGISTER
ADDRESS
ACK
STOP
1 -> 0
1001_100
0
0
XXh
0
1 -> 0
3.5
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 3.5.
Table 3.5 Receive Byte Protocol
START
SLAVE
ADDRESS
RD
ACK
REGISTER DATA
NACK
STOP
1 -> 0
1001_100
1
0
XXh
1
1 -> 0
3.6
SMBus Address
The EMC1046/EMC1047-1 devices respond to the 7-bit slave address 1001_100xb.
The EMC1046-6 will respond to the 7-bit slave address 1001_101xb.
The EMC1047-2 will respond to the 7-bit slave address 1001_000xb.
Note: Other addresses are available. Contact SMSC for more information.
3.7
SMBus Timeout
The EMC1046/EMC1047 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 5.9).
SMSC EMC1046/EMC1047
13
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Chapter 4 Product Description
The EMC1046/EMC1047 are SMBus temperature sensors. The EMC1046/EMC1047 monitor up to six
(6) external diodes and one internal 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 EMC1046/EMC1047
and using that data to control the speed of one or more fans.
Because the EMC1046/EMC1047 automatically corrects 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 devices without resistance error
correction. As well, the automatic beta detection feature means that there is no need to program the
device according to which type of diode is present. Therefore, the device can power up ready to
operate for any system configuration including those diodes that require the BJT or transistor model.
Figure 4.1 shows a system level block diagram of the EMC1046/EMC1047.
.
EMC1046/7
CPU
DP1 / DN6 (1047 only)
DN1 / DP6 (1047 only)
VDD
DP2 / DN3
Optional
APD
Host
DN2 / DP3
DP4 / DN5
Optional
APD
SMDATA
SMCLK
SMBus
Interface
DN4 / DP5
Internal
Diode
Figure 4.1 System Diagram for EMC1046/EMC1047
4.1
Modes of Operation
The EMC1046/EMC1047 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.
Revision 0.69 (06-29-09)
14
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
4.2
Temperature Monitoring
The EMC1046/EMC1047 can monitor the temperature of up to six (6) externally connected diodes as
well as the internal or ambient temperature. Each channel is configured with the following features
enabled or disabled based on user settings and system requirements.
APPLICATION NOTE: When measuring a 45nm CPU diode, the reported temperature has an error of approximately
+1.5C at 100°C. This error is related to non-perfect ideality in the CPU diode.
4.2.1
Resistance Error Correction
The EMC1046/EMC1047 includes active Resistance Error Correction to remove the effect of up to 100
ohms of series resistance. Without this automatic feature, voltage developed across the parasitic
resistance in the remote diode path causes the temperature to read higher than the true temperature
is. The error induced by parasitic resistance is approximately +0.7°C per ohm. Sources of series
resistance include bulk resistance in the remote temperature transistor junctions, series resistance in
the CPU, and resistance in the printed circuit board traces and package leads. Resistance error
correction in the EMC1046/EMC1047 eliminates the need to characterize and compensate for parasitic
resistance in the remote diode path.
4.2.2
Beta Compensation
The forward current gain, or beta, of a transistor is not constant as emitter currents change. As well,
it is not constant over changes in temperature. The variation in beta causes an error in temperature
reading that is proportional to absolute temperature. Compensating for this error is also known as
implementing the BJT or transistor 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 Beta Compensation circuitry in the EMC1046/EMC1047 corrects for this beta variation to eliminate
any error which would normally be induced. It automatically detects the appropriate beta setting to use.
4.2.3
Digital Averaging
To reduce the effect of noise and temperature spikes on the reported temperature, all of the external
diode channels use digital averaging. This averaging acts as a running average using the previous four
measured values.
The default setting is to have digital averaging disabled for all channels. It can be enabled for each
channel individually by the Filter Control Register (see Section 5.18).
4.2.4
“Hottest Of” Comparison
At the end of every measurement cycle, the EMC1046/EMC1047 compares all of the user selectable
External Diode channels to determine which of these channels is reporting the hottest temperature.
The hottest temperature is stored in the Hottest Temperature Registers and the appropriate status bit
in the Hottest Status Register is set. As an optional feature, the EMC1046/EMC1047 can also flag an
event if the hottest temperature channel changes. For example, suppose that External Diode channels
1, 3, and 4 are programmed to be compared in the “Hottest Of” Comparison. If the External Diode 1
channel reports the hottest temperature of the three, its temperature is copied into the Hottest
Temperature Registers (in addition to the External Diode 1 Temperature registers) and it is flagged in
the Hottest Status bit. If, on the next measurement, the External Diode 3 channel temperature has
increased such that it is now the hottest temperature, the EMC1046/EMC1047 can flag this event.
SMSC EMC1046/EMC1047
15
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
4.2.5
Conversion Rates
The EMC1046/EMC1047 may be configured for different conversion rates based on the system
requirements. The conversion rate is configured as described in Section 5.5. The default conversion
rate is 4 conversions per second. Other available conversion rates are shown in Table 5.7.
4.2.6
Dynamic Averaging
Dynamic averaging causes the EMC1046/EMC1047 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 5.5). 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 4x 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 also 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 4.1 for the EMC1046/EMC1047.
Table 4.1 Supply Current vs. Conversion Rate for EMC1046/EMC1047
AVERAGE SUPPLY CURRENT
AVERAGING FACTOR (BASED ON
11-BIT OPERATION)
CONVERSION RATE
ENABLED
(DEFAULT)
DISABLED
ENABLED
(DEFAULT)
DISABLED
1 / sec
605uA
395uA
4x
1x
2 / sec
635uA
465uA
2x
1x
4 / sec (default)
700uA
700uA
1x
1x
Continuous (see Table 5.8)
825uA
825uA
0.5x
0.5x
4.3
Diode Connections
The diode connection for the External Diode 1 channel is determined based on the selected device.
For the EMC1046, this channel can support a diode-connected transistor (such as a 2N3904) or a
substrate transistor (such as those found in an CPU or GPU) as shown in Figure 4.2. Anti-parallel
diodes are not supported on the External Diode 1 channel.
For the EMC1047, all channels support anti-parallel diodes. If this function is enabled for a specific
channel (see Section 5.17), then both the normal and anti-parallel diodes must use diode connected
transistors. Otherwise, they may use a diode connected transistor or a substrate transistor.
Revision 0.69 (06-29-09)
16
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
to
DP
to
DP
to
DP
to
DN
to
DN
to
DN
Local Ground
Typical remote
substrate transistor
i.e. CPU substrate PNP
Typical remote
discrete PNP transistor
i.e. 2N3906
Typical remote
discrete NPN transistor
i.e. 2N3904
Figure 4.2 Diode Connections
4.3.1
Diode Faults
The EMC1046/EMC1047 actively detects an open and short condition on each measurement channel.
When a diode fault is detected, the temperature data MSByte is forced to a value of 80h and the
FAULT bit is set in the Status Register. When an external diode channel is configured to operate in
APD mode, the circuitry will detect independent open fault conditions, however a short condition will
be shared between the APD channels.
SMSC EMC1046/EMC1047
17
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Chapter 5 Register Description
The registers shown in Table 5.1 are accessible through the SMBus. An entry of ‘-’ indicates that the
bit is not used and will always read ‘0’.
Table 5.1 Register Set in Hexadecimal Order
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
00h
R
Internal Diode Data
High Byte
Stores the integer data for the
Internal Diode
00h
Page 22
01h
R
External Diode 1
Data High Byte
Stores the integer data for the
External Diode 1
00h
Page 22
02h
R-C
Status
Stores the status bits for the
Internal Diode and External Diodes
00h
Page 23
03h
R/W
Configuration
Controls the general operation of
the device (mirrored at address
09h)
00h
Page 24
04h
R/W
Conversion Rate
Controls the conversion rate for
updating temperature data
(mirrored at address 0Ah)
06h
(4/sec)
Page 24
05h
R/W
Internal Diode High
Limit
Stores the 8-bit high limit for the
Internal Diode (mirrored at address
0Bh)
55h
(85°C)
Page 25
06h
R/W
Internal Diode Low
Limit
Stores the 8-bit low limit for the
Internal Diode (mirrored at address
0Ch)
00h
(0°C)
Page 25
07h
R/W
External Diode 1
High Limit High Byte
Stores the integer portion of the
high limit for the External Diode 1
(mirrored at register 0Dh)
55h
(85°C)
Page 25
08h
R/W
External Diode 1 Low
Limit High Byte
Stores the integer portion of the
low limit for the External Diode 1
(mirrored at register 0Eh)
00h
(0°C)
Page 25
09h
R/W
Configuration
Controls the general operation of
the device (mirrored at address
03h)
00h
Page 24
0Ah
R/W
Conversion Rate
Controls the conversion rate for
updating temperature data
(mirrored at address 04h)
06h
(4/sec)
Page 24
0Bh
R/W
Internal Diode High
Limit
Stores the 8-bit high limit for the
Internal Diode (mirrored at address
05h)
55h
(85°C)
Page 25
0Ch
R/W
Internal Diode Low
Limit
Stores the 8-bit low limit for the
Internal Diode (mirrored at address
06h)
00h
(0°C)
Page 25
0Dh
R/W
External Diode1 High
Limit High Byte
Stores the integer portion of the
high limit for the External Diode 1
(mirrored at register 07h)
55h
(85°C)
Page 25
Revision 0.69 (06-29-09)
18
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Table 5.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
0Eh
R/W
External Diode1 Low
Limit High Byte
Stores the integer portion of the
low limit for the External Diode 1
(mirrored at register 08h)
00h
(0°C)
Page 25
0Fh
W
One shot
A write to this register initiates a
one shot update.
00h
Page 27
10h
R
External Diode 1
Data Low Byte
Stores the fractional data for the
External Diode 1
00h
Page 22
13h
R/W
External Diode 1
High Limit Low Byte
Stores the fractional portion of the
high limit for the External Diode 1
00h
Page 25
14h
R/W
External Diode 1 Low
Limit Low Byte
Stores the fractional portion of the
low limit for the External Diode 1
00h
Page 25
15h
R/W
External Diode 2
High Limit High Byte
Stores the integer portion of the
high limit for External Diode 2
55h
(85°C)
Page 25
16h
R/W
External Diode 2 Low
Limit High Byte
Stores the integer portion of the
low limit for External Diode 2
00h
(0°C)
Page 25
17h
R/W
External Diode 2
High Limit Low Byte
Stores the fractional portion of the
high limit External Diode 2
00h
Page 25
18h
R/W
External Diode 2 Low
Limit Low Byte
Stores the fractional portion of the
low limit for External Diode 2
00h
Page 25
1Bh
R-C
External Diode Fault
Stores status bits indicating which
external diode detected a diode
fault
00h
Page 28
22h
R/W
Consecutive ALERT
Controls the number of out-of-limit
conditions that must occur before
the status bit is asserted
70h
Page 28
23h
R
External Diode 2
Data High Byte
Stores the integer data for External
Diode 2
00h
Page 22
24h
R
External Diode 2
Data Low Byte
Stores the fractional data for
External Diode 2
00h
Page 22
25h
R/W
External Diode 1
Beta Configuration
Stores the Beta Compensation
circuitry settings for External Diode
1
08h
Page 29
26h
R/W
External Diode 2
Beta Configuration
Stores the Beta Compensation
circuitry settings for External Diode
2
08h
Page 29
29h
R
Internal Diode Data
Low Byte
Stores the fractional data for the
Internal Diode
00h
Page 22
2Ah
R
External Diode 3
High Byte
Stores the integer data for External
Diode 3
00h
Page 22
2Bh
R
External Diode 3 Low
Byte
Stores the fractional data for
External Diode 3
00h
Page 22
2Ch
R/W
External Diode 3
High Limit High Byte
Stores the integer portion of the
high limit for External Diode 3
55h
(85°C)
Page 25
SMSC EMC1046/EMC1047
19
DATASHEET
DEFAULT
VALUE
PAGE
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Table 5.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
2Dh
R/W
External Diode 3 Low
Limit High Byte
Stores the integer portion of the
low limit for External Diode 3
00h
(0°C)
Page 25
2Eh
R/W
External Diode 3
High Limit Low Byte
Stores the fractional portion of the
high limit for External Diode 3
00h
Page 25
2Fh
R/W
External Diode 3 Low
Limit Low Byte
Stores the fractional portion of the
low limit for External Diode 3
00h
Page 25
32h
R
Hottest Diode High
Byte
Stores the integer data for the
hottest temperature
00h
Page 30
33h
R
Hottest Diode Low
Byte
Stores the fractional data for the
hottest temperature
00h
Page 30
34h
R-C
Hottest Status
Status bits indicating which
external diode is hottest
00h
Page 31
35h
R-C
High Limit Status
Status bits for the High Limits
00h
Page 31
36h
R-C
Low Limit Status
Status bits for the Low Limits
00h
Page 32
39h
R/W
REC Configuration
Controls REC for all channels
00h
Page 32
3Ah
R/W
Hottest Config
Controls which external diode
channels are used in the “hottest
of “comparison
00h
Page 33
3Bh
R/W
Channel Config
Controls which channels are
enabled
00h
Page 33
40h
R/W
Filter Control
Controls the digital filter setting for
the External Diode 1 channel
00h
Page 34
41h
R
External Diode 4
Data High Byte
Stores the integer data for the
External Diode 4 channel
00h
Page 22
42h
R
External Diode 4
Data Low Byte
Stores the fractional data for the
External Diode 4 channel
00h
Page 22
43h
R
External Diode 5
Data High Byte
Stores the integer data for the
External Diode 5 channel
00h
Page 22
44h
R
External Diode 5
Data Low Byte
Stores the fractional data for the
External Diode 5 channel
00h
Page 22
45h
R
External Diode 6
Data High Byte
Stores the integer data for the
External Diode 6 channel
00h
Page 22
46h
R
External Diode 6
Data Low Byte
Stores the fractional data for the
External Diode 6 channel
00h
Page 22
50h
R/W
External Diode 4
High Limit High Byte
Stores the integer data for the high
limit for the External Diode 4
channel
55h
(85°C)
Page 25
51h
R/W
External Diode 4 Low
Limit High Byte
Stores the integer data for the low
limit for the External Diode 4
channel
00h
(0°C)
Page 25
Revision 0.69 (06-29-09)
20
DATASHEET
PAGE
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Table 5.1 Register Set in Hexadecimal Order (continued)
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
DEFAULT
VALUE
PAGE
52h
R/W
External Diode 4
HIgh Limit Low Byte
Stores the fractional data for the
low limit for the External Diode 4
channel
00h
Page 25
53h
R/W
External Diode 4 Low
Limit Low Byte
Stores the fractional data for the
low limit for the External Diode 4
channel
00h
Page 25
54h
R/W
External Diode 5
High Limit High Byte
Stores the integer data for the high
limit for the External Diode 5
channel
55h
(85°C)
Page 25
55h
R/W
External Diode 5 Low
Limit High Byte
Stores the integer data for the low
limit for the External Diode 5
channel
00h
(0°C)
Page 25
56h
R/W
External Diode 5
HIgh Limit Low Byte
Stores the fractional data for the
low limit for the External Diode 5
channel
00h
Page 25
57h
R/W
External Diode 5 Low
Limit Low Byte
Stores the fractional data for the
low limit for the External Diode 5
channel
00h
Page 25
58h
R/W
External Diode 6
High Limit High Byte
Stores the integer data for the high
limit for the External Diode 6
channel
55h
(85°C)
Page 25
59h
R/W
External Diode 6 Low
Limit High Byte
Stores the integer data for the low
limit for the External Diode 6
channel
00h
(0°C)
Page 25
5Ah
R/W
External Diode 6
HIgh Limit Low Byte
Stores the fractional data for the
low limit for the External Diode 6
channel
00h
(0°C)
Page 25
5Bh
R/W
External Diode 6 Low
Limit Low Byte
Stores the fractional data for the
low limit for the External Diode 6
channel
00h
(0°C)
Page 25
71h
R/W
External Diode 4
Beta Configuration
Stores the Beta Compensation
circuitry settings for External Diode
4
08h
Page 29
FDh
R
Product ID EMC1046
Stores a fixed value that identifies
each product
1Ah
Page 34
FDh
R
Product ID EMC1047
Stores a fixed value that identifies
each product
1Ch
Page 34
FEh
R
Manufacturer ID
Stores a fixed value that
represents SMSC
5Dh
Page 35
FFh
R
Revision
Stores a fixed value that
represents the revision number
01h
Page 35
SMSC EMC1046/EMC1047
21
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
5.1
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.
5.2
Temperature Data Registers
Table 5.2 Temperature Data Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
00h
R
Internal Diode
High Byte
Sign
64
32
16
8
4
2
1
00h
29h
R
Internal Diode
Low Byte
0.5
0.25
0.125
-
-
-
-
-
00h
01h
R
External
Diode1 High
Byte
Sign
64
32
16
8
4
2
1
00h
10h
R
External Diode
1 Low Byte
0.5
0.25
0.125
-
-
-
-
-
00h
23h
R
External Diode
2 High Byte
Sign
64
32
16
8
4
2
1
00h
24h
R
External Diode
2 Low Byte
0.5
0.25
0.125
-
-
-
-
-
00h
2Ah
R
External Diode
3 High Byte
Sign
64
32
16
8
4
2
1
00h
2Bh
R
External Diode
3 Low Byte
0.5
0.25
0.125
-
-
-
-
-
00h
41h
R
External Diode
4 High Byte
Sign
64
32
16
8
4
2
1
00h
42h
R
External Diode
4 Low Byte
0.5
0.25
0.125
-
-
-
-
-
00h
43h
R
External Diode
5 High Byte
Sign
64
32
16
8
4
2
1
00h
44h
R
External Diode
5 Low Byte
0.5
0.25
0.125
-
-
-
-
-
00h
45h
R
External Diode
6 High Byte
Sign
64
32
16
8
4
2
1
00h
46h
R
External Diode
6 Low Byte
0.5
0.25
0.125
-
-
-
-
-
00h
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. The data format is
standard 2’s complement from -64°C to 127.875°C as shown in Table 5.3.
Revision 0.69 (06-29-09)
22
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Table 5.3 Temperature Data Format
BINARY
HEX (AS READ BY
REGISTERS)
Diode Fault
1000_0000_000b
80_00h
-64
1100_0000_000b
C0_00h
-63.875
1100_0000_001b
C0_20h
-1
1111_1111_000b
FF_00h
-0.125
1111_1111_111b
FF_E0h
0
0000_0000_000b
00_00h
0.125
0000_0000_001b
00_20h
1
0000_0001_000b
01_00h
63
0011_1111_000b
3F_00h
64
0100_0000_000b
40_00h
127
0111_1111_000b
7F_00h
127.875
0111_1111_111b
7F_E0h
TEMPERATURE (°C)
5.3
Status Register
Table 5.4 Status Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
02h
R
Status
BUSY
HOT
TEST
-
HIGH
LOW
FAULT
-
-
00h
The Status Register reports general error conditions. To identify specific channels, refer to Section 5.8,
Section 5.13, and Section 5.14. The individual Status Register bits (except HOTTEST) are cleared
when the appropriate High Limit or Low Limit register has been read or cleared.
Bit 7 - BUSY - This bit indicates that the ADC is currently converting.
Bit 6 - HOTTEST - This bit is set if the REM_HOT bit (see Section 5.17) is set and the hottest channel
changes. This bit is cleared when the register is read.
Bit 4 - HIGH - This bit is set when any of the temperature channels meets or exceeds its programmed
high limit. See the High Limit Status Register for specific channel information (Section 5.13).
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 (Section 5.14).
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 (Section 5.8).
SMSC EMC1046/EMC1047
23
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
5.4
Configuration Register
Table 5.5 Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
03h
R/W
Config
-
RUN /
STOP
B4
B3
B2
B1
B0
DEFAULT
-
-
-
DAVG_
DIS
-
00h
09h
The Configuration Register controls the basic operation of the device. This register is fully accessible
at either address.
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 1 - DAVG_DIS - Disables the dynamic averaging feature on all temperature channels (see
Section 4.2.6).
5.5
„
‘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 4.1.
„
‘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 (i.e.
more conversions per second), this averaging factor will be reduced as shown in Table 4.1.
Conversion Rate Register
Table 5.6 Conversion Rate Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
04h
R/W
Conversion
Rate
-
-
-
-
B3
B2
B1
B0
CONV[2:0]
DEFAULT
06h
(4/sec)
0Ah
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 5.7.
Table 5.7 Conversion Rate
CONV[2:0]
2
1
0
CONVERSIONS / SECOND
1
0
0
1
1
0
1
2
1
1
0
4 (default)
Revision 0.69 (06-29-09)
24
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Table 5.7 Conversion Rate (continued)
CONV[2:0]
2
1
0
CONVERSIONS / SECOND
1
1
1
Continuous
All Others
4
The actual conversion rate for Continuous conversions will depend on the number of diode channels
enabled and is shown in Table 5.8.
Table 5.8 Maximum Conversion Rate Per Temperature Channels
NUMBER OF EXTERNAL DIODE CHANNELS
MAX CONVERSION RATE
3
13 / sec
4
12 / sec
5
11 / sec
6 (EMC1047only)
10 / sec
5.6
Limit Registers
Table 5.9 Temperature Limit Registers
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
05h
R/W
Internal Diode
High Limit
Sign
64
32
16
8
4
2
1
55h
(85°C)
R/W
Internal Diode
Low Limit
Sign
64
32
16
8
4
2
1
00h
(0°C)
R/W
External
Diode1 High
Limit High
Byte
Sign
64
32
16
8
4
2
1
55h
(85°C)
13h
R/W
External
Diode 1 High
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
08h
R/W
External
Diode 1 Low
Limit High
Byte
Sign
64
32
16
8
4
2
1
00h
(0°C)
R/W
External
Diode1 Low
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
0Bh
06h
0Ch
07h
0Dh
0Eh
14h
SMSC EMC1046/EMC1047
25
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Table 5.9 Temperature Limit Registers (continued)
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
15h
R/W
External
Diode 2 High
Limit High
Byte
Sign
64
32
16
8
4
2
1
55h
(85°C)
16h
R/W
External
Diode 2 Low
Limit High
Byte
Sign
64
32
16
8
4
2
1
00h
(0°C)
17h
R/W
External
Diode 2 High
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
18h
R/W
External
Diode 2 Low
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
2Ch
R/W
External
Diode 3 High
Limit High
Byte
Sign
64
32
16
8
4
2
1
55h
(85°C)
2Dh
R/W
External
Diode 3 Low
Limit High
Byte
Sign
64
32
16
8
4
2
1
00h
(0°C)
2Eh
R/W
External
Diode 3 High
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
2Fh
R/W
External
Diode 3 Low
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
50h
R/W
External
Diode 4 High
Limit High
Byte
Sign
64
32
16
8
4
2
1
55h
(85°C)
51h
R/W
External
Diode 4 Low
Limit High
Byte
Sign
64
32
16
8
4
2
1
00h
(0°C)
52h
R/W
External
Diode 4 High
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
53h
R/W
External
Diode 4 Low
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
Revision 0.69 (06-29-09)
26
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Table 5.9 Temperature Limit Registers (continued)
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
54h
R/W
External
Diode 5 High
Limit High
Byte
Sign
64
32
16
8
4
2
1
55h
(85°C)
55h
R/W
External
Diode 5 Low
Limit High
Byte
Sign
64
32
16
8
4
2
1
00h
(0°C)
56h
R/W
External
Diode 5 High
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
57h
R/W
External
Diode 5 Low
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
58h
R/W
External
Diode 6 High
Limit High
Byte
Sign
64
32
16
8
4
2
1
55h
(85°C)
59h
R/W
External
Diode 6 Low
Limit High
Byte
Sign
64
32
16
8
4
2
1
00h
(0°C)
5Ah
R/W
External
Diode 6 High
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
5Bh
R/W
External
Diode 6 Low
Limit Low
Byte
0.5
0.25
0.125
-
-
-
-
-
00h
The device contains both high and low limits for all temperature channels. If the measured temperature
meets or exceeds the high limit, then the corresponding status bit is set. Likewise, if the measured
temperature is less than the low limit, the corresponding status bit is set.
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 5.4).
5.7
One Shot Register
Table 5.10 One Shot Register
ADDR.
R/W
REGISTER
0Fh
W
One Shot
SMSC EMC1046/EMC1047
B7
B6
B5
B4
B3
B2
B1
B0
Writing to this register initiates a single conversion cycle. Data
is not stored and always reads 00h
27
DATASHEET
DEFAULT
00h
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
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.
5.8
External Diode Fault Register
Table 5.11 External Diode Fault Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
1Bh
R-C
External
Diode Fault
-
E6FLT
E5FLT
E4FLT
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. These bits are cleared when read if the error condition has been removed.
Bit 6 - E6FLT - This bit is set if the External Diode 6 channel reported a diode fault.
Bit 5 - E5FLT - This bit is set if the External Diode 5 channel reported a diode fault.
Bit 4 - E4FLT - This bit is set if the External Diode 4 channel reported a diode fault.
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.
5.9
Consecutive ALERT Register
Table 5.12 Consecutive ALERT Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
22h
R/W
Consecutive
ALERT
TIME
OUT
-
-
-
CAL
RT2
CAL
RT1
CAL
RT0
-
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 interrupt status registers are asserted.
Each out of limit error and diode fault condition has its own counter associated with it. Each counter
is incremented whenever the corresponding channel exceeds the appropriate limit. Additionally, each
counter is reset if the condition has been removed. (i.e. if External Diode 1 exceeds its high limit, it
will increment the high counter. If, on the next measurement, it experiences a diode fault, the high limit
counter will be reset and the diode fault counter will be incremented).
When the consecutive alert counter reaches its programmed value then the STATUS bit(s) for that
channel and the error condition will be set to ‘1’. Measurements will continue normally.
For example, if the CALRT[2:0] bits are set for 4 consecutive alerts on an EMC1046/EMC1047 device,
the high limits are set at 70°C, and none of the channels are masked, then the status bits will be
asserted after the following four measurements:
1. Internal Diode reads 71°C and both external diodes read 69°C. Consecutive alert counter for INT
is incremented to 1.
Revision 0.69 (06-29-09)
28
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
2. Both the Internal Diode and the External Diode 1 read 71°C and External Diode 2 reads 68°C.
Consecutive alert counter for INT is incremented to 2 and for EXT1 is set to 1.
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 HIGH status bit
are set for EXT1. The 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.
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 STATUS bits is asserted. All temperature channels use this
value to set the respective counters. The bits are decoded as shown in Table 5.13. The default setting
is 1 consecutive out of limit conversion.
APPLICATION NOTE: If one of the fault queues is not cleared and the CALRT[2:0] bits are updated, the update
won’t take affect until fault queue is cleared. All the fault queues are independent so those
that are empty will be updated immediately.
Table 5.13 Consecutive Alert Settings
2
1
0
NUMBER OF CONSECUTIVE OUT OF LIMIT
MEASUREMENTS
0
0
0
1 (default for CALRT[2:0])
0
0
1
2
0
1
1
3
1
1
1
4
All Others
5.10
1 (CALRT[2:0]),
Beta Configuration Register
Table 5.14 Beta Configuration Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
25h
R/W
External Diode 1
Beta Configuration
-
-
-
-
AUTO1
BETA1[2:0]
08h
26h
R/W
External Diode 2
Beta Configuration
-
-
-
-
AUTO2
BETA2[2:0]
08h
71h
R/W
External Diode 4
Beta Configuration
-
-
-
-
AUTO4
BETA4[2:0]
08h
SMSC EMC1046/EMC1047
29
DATASHEET
B2
B1
B0
DEFAULT
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
These registers are used to set the Beta Compensation factor that is used for the External Diode
channels.
Bit 3 - AUTOx - Enables the Beta Compensation factor autodetection function.
„
‘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.
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 5.15 Beta Compensation Look Up Table
BETAX[2:0]
5.11
2
1
0
MINIMUM BETA
0
0
0
< 0.08
0
0
1
< 0.111
0
1
0
< 0.176
0
1
1
< 0.29
1
0
0
< 0.48
1
0
1
< 0.9
1
1
0
< 2.33
1
1
1
Disabled
Hottest Temperature Registers
Table 5.16 Hottest Temperature Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
32h
R
Hottest
Temperature
High Byte
Sign
64
32
16
8
4
2
1
80h
33h
R
Hottest
Temperature
Low Byte
0.5
0.25
0.125
-
-
-
-
-
00h
Revision 0.69 (06-29-09)
30
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
The Hottest Temperature Registers store the measured hottest temperature of all the selected external
diode channels (see Section 5.16). If no External diodes are selected then the High Byte Register will
read 80h. The data format is the same as the temperature channels.
5.12
Hottest Temperature Status Register
Table 5.17 Hottest Temperature Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
34h
R
Hottest
Temperature
Status
-
EXT6
EXT5
EXT4
EXT3
EXT2
EXT1
INT
00h
The Hottest Temperature Status Register flags which external diode temperature is hottest. If multiple
temperature channels measure the same temperature and are equal to the hottest temperature, then
hottest status will be based on the measurement order.
Bit 6 - EXT6 - The External Diode 6 channel is the hottest.
Bit 4 - EXT5 - The External Diode 5 channel is the hottest.
Bit 3 - EXT4 - The External Diode 4 channel is the hottest.
Bit 3 - EXT3 - The External Diode 3 channel is the hottest.
Bit 2 - EXT2 - The External Diode 2 channel is the hottest.
Bit 1 - EXT1 - The External Diode 1 channel is the hottest.
Bit 0 - INT - The Internal Diode channel is the hottest.
5.13
High Limit Status Register
Table 5.18 High Limit Status Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
35h
R-C
High Limit
Status
-
E6
HIGH
E5
HIGH
E4
HIGH
E3
HIGH
E2
HIGH
E1
HIGH
I
HIGH
00h
The High Limit Status Register contains the status bits that are set when a temperature channel high
limit is exceeded for a number of consecutive readings as set by the consecutive alert counts (see
Section 5.9). 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 the error condition has been removed. Reading
from the register will also clear the HIGH status bit in the Status Register.
Bit 6 - E6HIGH - This bit is set when the External Diode 6 channel meets or exceeds its programmed
high limit.
Bit 5 - E5HIGH - This bit is set when the External Diode 5 channel meets or exceeds its programmed
high limit.
Bit 4 - E4HIGH - This bit is set when the External Diode 4 channel meets or exceeds its programmed
high limit.
Bit 3 - E3HIGH - This bit is set when the External Diode 3 channel meets or exceeds its programmed
high limit.
SMSC EMC1046/EMC1047
31
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Bit 2 - E2HIGH - This bit is set when the External Diode 2 channel meets or exceeds its programmed
high limit.
Bit 1 - E1HIGH - This bit is set when the External Diode 1 channel meets or exceeds its programmed
high limit.
Bit 0 - IHIGH - This bit is set when the Internal Diode channel meets or exceeds its programmed high
limit.
5.14
Low Limit Status Register
Table 5.19 Low Limit Status Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
36h
R-C
Low Limit
Status
-
E6
LOW
E5
LOW
E4
LOW
E3
LOW
E2
LOW
E1
LOW
ILOW
00h
The Low Limit Status Register contains the status bits that are set when a temperature channel drops
below the low limit for a number of consecutive readings as set by the consecutive alert counts (see
Section 5.9). If any of these bits are set, then the LOW status bit in the Status Register is set. Reading
from the Low Limit Status Register will clear all bits if the error condition has been removed. Reading
from the register will also clear the LOW status bit in the Status Register.
Bit 6 - E6LOW - This bit is set when the External Diode 6 channel drops below its programmed low
limit.
Bit 5- E5LOW - This bit is set when the External Diode 5 channel drops below its programmed low limit.
Bit 4 - E4LOW - This bit is set when the External Diode 4 channel drops below its programmed low
limit.
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.
5.15
REC Configuration Register
Table 5.20 REC Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
39h
R/W
REC Config
-
E6_
REC_n
E5_
REC_n
E4_
REC_n
E3_
REC_n
E2_
REC_n
E1_
REC_n
-
00h
The REC Control Register controls the Resistance Error Correction circuitry for each of the external
diode channels.
Bits 6 - 0 - Ex_REC_n (EMC1047 only) - Disables the Resistance Error Correction (REC) for the
External Diode X channel. Note that E6_REC_n can only be written for the EMC1047 only
Revision 0.69 (06-29-09)
32
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
5.16
„
‘0’ (default) - REC is enabled.
„
‘1’ - REC is disabled.
Hottest Configuration Register
Table 5.21 Hottest Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
3Ah
R/W
Hottest
Config
-
E6HOT
E5HOT
E4HOT
E3HOT
E2HOT
E1HOT
IHOT
00h
The Hottest Configuration Register determines which External Diode Channels (if any) are compared
during the “Hottest Of” comparison that is automatically performed at the end of every conversion
cycle.
Bits 6 - 0 - ExHOT - Controls whether the External Diode X temperature data is compared during the
“Hottest Of” comparison.
„
‘0’ (default) - The External Diode X channel is not compared during the “Hottest Of” Comparison.
„
‘1’ - The External Diode X channel temperature data is compared to all other indicated channels
during the “Hottest Of” Comparison.
Bit 0 - IHOT - Controls whether the Internal Diode temperature data is compared during the “Hottest
Of” comparison.
5.17
„
‘0’ (default) - The Internal Diode channel is not compared during the “Hottest Of” Comparison.
„
‘1’ - The Internal Diode channel temperature data is compared to all other indicated channels during
the “Hottest Of” Comparison.
Channel Configuration Register
Table 5.22 Channel Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
3Bh
R/W
Channel
Config
REM_
HOT
-
-
-
-
EXT4_
APD
EXT2_
APD
EXT1_
APD
00h
The Channel Configuration Register determines which external diode channels are active in the device.
Bit 7 - REM_HOT - Enables circuitry that will remember the last temperature channel that was
determined to be the Hottest and flag an error if the hottest temperature channel changes.
„
‘0’ (default) - The HOTTEST status bit will not be asserted if the hottest temperature channel
changes.
„
‘1’ - If the hottest temperature channel changes, then the HOTTEST status bit will be asserted.
Bit 2 - EXT4_APD - Enables the DP4 / DN5 and DN4 / DP5 pins to support two anti-parallel diode
connections versus a single diode connection.
„
‘0’ (default) - The DP4 / DN5 and DN4 / DP5 pins do not support two anti-parallel diode
connections. The pins will only monitor a single external diode (External Diode 4).
„
‘1’ - The DP4 / DN5 and DN4 / DP5 pins support two anti-parallel diode connections (External
Diode 4 and External Diode 5).
SMSC EMC1046/EMC1047
33
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Bit 1 - EXT2_APD- Enables the DP2 / DN3 and DN2 / DP3 pins to support two anti-parallel diode
connections versus a single diode connection.
„
‘0’ (default) - The DP2 / DN3 and DN2 / DP3 pins do not support two anti-parallel diode
connections. The pins will only monitor a single external diode (External Diode 2).
„
‘1’ - The DP2 / DN3 and DN2 / DP3 pins support two anti-parallel diode connections (External
Diode 2 and External Diode 3).
Bit 0 - EXT1_APD (EMC1047 only)- Enables the DP1 / DN6 and DN1 / DP6 pins to support two antiparallel diode connections versus a single diode connection.
5.18
„
‘0’ (default) - The DP1 / DN6 and DN1 / DP6 pins do not support two anti-parallel diode
connections. The pins will only monitor a single external diode (External Diode 1).
„
‘1’ - The DP1 / DN6 and DN1 / DP6 pins support two anti-parallel diode connections (External
Diode 1 and External Diode 6.
Filter Control Register
Table 5.23 Filter Control Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
40h
R/W
Filter Control
-
AVG6_
EN
AVG5_
EN
AVG4_
EN
AVG3_
EN
AVG2_
EN
AVG1_
EN
-
00h
The Filter Configuration Register controls the digital filter on the external diode channels.
Bits 6 - 0 - AVGx_EN- Control the digital averaging that is applied to the External Diode X temperature
measurements.
5.19
„
‘0’ (default) - Digital Averaging is disabled.
„
‘1’ - Digital averaging is enabled as a 4x running average for the External Diode X channel.
Product ID Register
Table 5.24 Product ID Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
FDh
R
Product ID
0
0
0
1
1
0
1
0
1Ah
EMC1046
0
0
0
1
1
1
0
0
1Ch
EMC1047
The Product ID Register holds a unique value that identifies the device.
Revision 0.69 (06-29-09)
34
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
5.20
Manufacturer ID Register (FEh)
Table 5.25 Manufacturer ID Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
FEh
R
Manufacturer
ID
0
1
0
1
1
1
0
1
5Dh
The Manufacturer ID Register holds an 8-bit word that identifies SMSC.
5.21
Revision Register (FFh)
Table 5.26 Revision Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
FFh
R
Revision
0
0
0
0
0
0
0
1
01h
The Revision register contains an 8 bit word that identifies the die revision.
SMSC EMC1046/EMC1047
35
DATASHEET
Revision 0.69 (06-29-09)
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Chapter 6 Package Information
6.1
EMC1046/EMC1047 Package Drawing
REVISION HISTORY
REVISION
A
D
PIN 1 IDENTIFIER
AREA (D/2 X E1/2)
e
E1
3
4
2
DESCRIPTION
DATE
RELEASED BY
3/29/05
S.K.ILIEV
5
3
c
INITIAL RELEASE
4
E
SEE DETAIL "A"
10X b
END VIEW
TOP VIEW
A2
A
C
SEATING PLANE
A1
ccc C
3-D VIEW
SIDE VIEW
H
C
GAUGE PLANE
0.25
NOTES:
1. ALL DIMENSIONS ARE IN MILLIMETER.
2. TOLERANCE ON THE TRUE POSITION OF EACH LEAD IS ± 0.04 mm AT MAXIMUM MATERIAL
CONDITION.
3. PACKAGE BODY DIMENSIONS "D" AND "E1" DO NOT INCLUDE MOLD/INTERLEAD 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 THE OUTERMOST EXTREMES OF THE
PLASTIC BODY, INCLUDING ANY MISMATCH BETWEEN TOP AND BOTTOM PLASTIC BODY. THEY
ARE DETERMINED AT DATUM PLANE "H".
4. DIMENSIONS "b" AND "c" APPLY TO THE FLAT SECTION OF THE LEAD BETWEEN 0.08 mm AND
0.15 mm FROM THE LEAD TIP.
5. DETAILS OF THE PIN 1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE
INDICATED.
SEATING PLANE
0° - 8°
L
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN MILLIMETERS
AND TOLERANCES ARE:
(0.95)
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
NAME
DATE
S.K.ILIEV
3/29/05
DIM AND TOL PER ASME Y14.5M - 1994
DETAIL "A"
MATERIAL
FINISH
-
CHECKED
S.K.ILIEV
S.K.ILIEV
REV
DWG NUMBER
MO-10-TSSOP-3x3
3/29/05
APPROVED
PRINT WITH "SCALE TO FIT"
DO NOT SCALE DRAWING
PACKAGE OUTLINE
10 PIN TSSOP, 3x3 MM BODY, 0.50 MM PITCH
DRAWN
STD COMPLIANCE
SCALE
3/29/05
1:1
JEDEC: MO-187
A
SHEET
1 OF 1
Figure 6.1 10-Pin TSSOP Package Drawing
6.2
Package Markings
6.2.1
EMC1046-X-AIZL (10-Pin TSSOP)
All devices will be marked on the first line of the top side with “1046” or “1047”. On the second line,
they will be marked with the appropriate -X number (-1, -2, etc), the Functional Revision “B” and
Country Code (CC) .
Revision 0.69 (06-29-09)
36
DATASHEET
SMSC EMC1046/EMC1047
1°C Multiple Temperature Sensor with Beta Compensation and Hottest of Thermal Zones
Datasheet
Chapter 7 Revision History
Table 7.1 Customer Revision History
REVISION LEVEL AND
DATE
Rev. 0.69 (06-29-09)
SECTION/FIGURE/ENTRY
CORRECTION
Table 1.1, "EMC1046/EMC1047 Pin
Description"
Added “requires external pullup
resistor” to SMDATA and SMCLK in
function column
Table 1.1, "EMC1046/EMC1047 Pin
Description"
Added the following application note
below table: “For the 5V tolerant pins
that have a pull-up resistor, the voltage
difference between VDD and the pullup voltage must never exceed 3.6V.”
Table 2.1, "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, the pull-up voltage
must not exceed 3.6V when the device
is unpowered.”
SMSC EMC1046/EMC1047
37
DATASHEET
Revision 0.69 (06-29-09)
Similar pages