EMC1043 DATA SHEET (04/14/2008) DOWNLOAD

EMC1043
1°C Triple Temperature
Sensor with Beta
Compensation and
Hotter of Two Zones
PRODUCT FEATURES
Datasheet
General Description
Features
The EMC1043 is a family of System Management Bus
(SMBus) temperature sensors that monitors three
temperature zones, one internal diode and two
externally connected diodes, for PC and embedded
environments. The EMC1043 includes beta
compensation circuitry to correct for variation in the beta
of measurement transistors. Other extended features
include resistance error correction and ideality factor
configuration to eliminate major sources of temperature
measurement error.1
An added feature to the EMC1043 is a function that
automatically compares the two external temperature
zones and reports the hotter of the two temperatures.
Selectable conversion rates and standby mode support
low-power operation. The temperature measurement
ranges support two data ranges (and formats), -64°C to
+127°C and -64°C to +191°C.
„
„
„
Supports two External Temperature Diodes
±1°C Accuracy (40°C to 80°C)
0.125°C Resolution
Ideality Factor Configuration
Accepts 2200pF Cap Across External Diodes for Noise
Suppression
— Optional Resistive Error Correction on External Diode 2
— Resistance Error Correction (up to 100 Ohms)
— Beta Compensation
—
—
—
—
„
Internal Temperature Diode
— ±3°C Accuracy (0°C to 85°C)
— 0.125°C Resolution
„
Low Power Operation
„
„
3.0V to 3.6V Supply
Programmable Conversion Rate
SMBus 2.0 Compliant
„
Reports Hotter of Two Diodes with Dual-core CPU
— 4uA Standby Current
„
— Four SMBus Address Available
Applications
„
„
Desktop and Notebook Computers
Hardware Management
Servers
Embedded Applications
1.Patents pending
Simplified Block Diagram
Switching
Current
Configuration
Register
Analog Mux
and Anti-Alias Filter
DN1
DP2
DN2
Local Temp
Diode
11-bit
delta-sigma
ADC
External Diode
2 Register
Digital Mux
and
Byte Interlock
Internal Diode
Register
SMCLK
Status Register
SMSC EMC1043
DATASHEET
SMBus Interface
External Diode
1 Register
DP1
SMDATA
Revision 1.44 (04-14-08)
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
ORDERING INFORMATION
ORDERING NUMBER
PACKAGE
FEATURES
SMBUS ADDRESS
EMC1043-1-ACZL-TR
1001_100x
EMC1043-2-ACZL-TR
EMC1043-3-ACZL-TR
EMC1043-4-ACZL-TR
8 pinMSOP package
(Lead Free ROHS
compliant)
Two external diodes with
REC and Beta
Compensation and Hottest
Of Comparision
1001_000x
1001_001x
Two external diodes with
REC. Beta Compensation
on External Diode 1 only.
Hottest of Comparision
EMC1043-5-ACZL-TR
1001_101x
1001_100x
Reel size is 4,000 pieces.
Evaluation Boards available upon request. (EVB-EMC1043, EVB-EMC1043C)
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123
Copyright © 2008 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 1.44 (04-14-08)
2
DATASHEET
SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Table of Contents
Chapter 1 Pin Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Chapter 2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1
2.2
2.3
2.4
2.5
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
System Management Bus Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3.1
Write Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3.2
Read Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3.3
Send Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3.4
Receive Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3.5
SMBus Timing Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SMBus Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SMBus Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chapter 3 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
One Shot During Standby Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation During Run Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.1
Conversion Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.2
Dynamic Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Measurement Results and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resistance Error Correction (REC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Beta Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programmable Ideality Factor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diode Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
11
12
12
12
13
14
15
15
16
16
Chapter 4 Register Set and Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
Legacy Temperature Data Registers (00h, 23h, 01h, 10h, F8h, F9h) . . . . . . . . . . . . . . . . . . . . . .
Extended Format Temperature Registers (FAh-FDh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Register - 02h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Register (03h Read, 09h Write) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration 2 Register - (04h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
One Shot Register - (0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ideality Configuration Registers (27h - 28h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Beta Configuration Registers (29h - 2Ah). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product ID Register (EDh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manufacturer ID Register (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision Register (FFh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
19
20
20
21
22
22
24
25
25
25
Chapter 5 Typical Operating Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Chapter 6 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.1
Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
SMSC EMC1043
3
DATASHEET
Revision 1.44 (04-14-08)
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
List of Figures
Figure 1.1
Figure 2.1
Figure 3.1
Figure 3.2
Figure 3.3
Figure 6.1
EMC1043 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
System Management Bus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
EMC1043 System Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Block Diagram of Temperature Monitoring Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
External Diode Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8-Pin MSOP Package Outline - 3x3mm Body 0.65mm Pitch. . . . . . . . . . . . . . . . . . . . . . . . . 28
Revision 1.44 (04-14-08)
4
DATASHEET
SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
List of Tables
Table 1.1 EMC1043 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 2.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 2.2 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 2.3 Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2.4 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2.5 Send Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 2.6 Receive Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 3.1 Supply Current vs. Conversion Rate and ADC Averaging Factor . . . . . . . . . . . . . . . . . . . . . . 12
Table 3.2 EMC1043 Temperature Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 4.1 EMC1043 Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 4.2 Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 4.3 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 4.4 Conversion Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 4.5 Configuration 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 4.6 One Shot Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 4.7 Ideality Configuration Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 4.8 Ideality Factor Look Up Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 4.9 Substrate Diode Ideality Factor Look-Up Table (BJT Model) . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 4.10 Beta Configuration Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 4.11 Beta Configuration Look Up Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 4.12 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 4.13 Manufacturer ID Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 4.14 Revision Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 6.1 8-Pin MSOP Package Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
SMSC EMC1043
5
DATASHEET
Revision 1.44 (04-14-08)
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Chapter 1 Pin Function
DP1
1
DN1
2
8
SMCLK
7
SMDATA
8-MSOP
DP2
3
6
VDD
DN2
4
5
GND
Figure 1.1 EMC1043 Pin Diagram
Table 1.1 EMC1043 Pin Description
PIN
PIN NO.
DP1
1
External Diode 1 Positive (anode) Connection
DN1
2
External Diode 1 Negative (cathode) Connection
DP2
3
External Diode 2 Positive (anode) Connection
DN2
4
External Diode 2 Negative (cathode) Connection
GND
5
Ground
VDD
6
Supply Voltage
SMDATA
7
System Management Bus Data - bi-directional data, open drain output
SMCLK
8
System Management Bus Clock Input
Revision 1.44 (04-14-08)
DESCRIPTION
6
DATASHEET
SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two 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 5.0
V
Voltage on SMDATA and SMCLK pins
-0.3 to 5.5
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
Lead Temperature Range
Refer to JEDEC
Spec. J-STD-020
Package Thermal Characteristics for MSOP-8
Thermal Resistance TJA(at 0 air flow)
ESD Rating, All Pins Human Body Model
135.9
°C/W
2000
V
Note: Stresses above those listed could cause 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.
2.2
Electrical Specifications
Table 2.2 Electrical Characteristics
VDD=3.0V to 3.6V, TA= -20°C to +85°C, Typical values at TA = 27°C unless otherwise noted
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
CONDITIONS
Supply Voltage
VDD
3.0
3.3
3.6
V
Average Operating Current
IDD
340
400
μA
4 conversions/s
See Table 4.4.
ISTBY
2
4
μA
Standby mode
±1
±3
°C
-20°C≤ TA ≤85°C
± 1.5
°C
0°C < TA ≤ 85°C
DC Power
Internal Temperature Monitor
Temperature Accuracy
Temperature Resolution
SMSC EMC1043
0.125
7
DATASHEET
°C
Revision 1.44 (04-14-08)
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Table 2.2 Electrical Characteristics (continued)
VDD=3.0V to 3.6V, TA= -20°C to +85°C, Typical values at TA = 27°C unless otherwise noted
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
±1
±3
±5
°C
°C
°C
CONDITIONS
External Temperature Monitor
Temperature Accuracy
Remote Diode 40°C to 80°C
Remote Diode -20°C to 125°C
Remote Diode -64°C to 192°C
Temperature Resolution
Filter Capacitor
°C
0.125
CFILTER
15°C≤TA≤70°C
-20°C≤TA≤85°C
-20°C≤TA≤85°C
2.2
nF
5.5
V
Connected across
external diode
Note 2.2
Voltage Tolerance
Voltage at pin ( SMDATA,SMCLK)
VTOL
-0.3
Input High Level
VIH
2.0
Input Low Level
VIL
SMBus Interface (SMDATA,SMCLK)
Input High/Low Current
IIH/IIL
-1
Hysteresis
Input Capacitance
Output Low Sink Current
V
0.8
V
1
μA
500
mV
5
pF
6
mA
SMDATA = 0.6V
SMBus Timing
Clock Frequency
FSMB
10
Spike Suppression
400
kHz
50
ns
TBUF
1.3
μs
Hold time Start
THD:STA
0.6
μs
Setup time Start
TSU:STA
0.6
μs
Setup time Stop
TSU:STO
0.6
μs
Data Hold Time
THD:DAT
0.3
μs
Data Setup Time
TSU:DAT
100
ns
Clock Low Period
TLOW
1.3
μs
Clock High Period
THIGH
0.6
μs
Clock/Data Fall Time
TF
*
300
ns
*Min = 20+0.1Cb ns
Clock/Data Rise Time
TR
*
300
Note
2.1
ns
*Min = 20+0.1Cb ns
Capacitive Load (each bus line)
Cb
0.6
400
pF
Bus free time Start to Stop
Revision 1.44 (04-14-08)
8
DATASHEET
SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
2.3
Note 2.1
300nS rise time max is required for 400kHz bus operation. For lower clock frequencies,
the maximum rise time is (0.1/FSMB)+50nS
Note 2.2
See SMSC Applications for Application Notes and Guidelines when measuring GPU
processor diodes and CPU processor diodes.
System Management Bus Interface Protocol
A host controller, such as an SMSC I/O controller, communicates with the EMC1043 via the two wire
serial interface named SMBus. The SMBus interface is used to read and write registers in the
EMC1043, which is a slave-only device. A detailed timing diagram is shown in Figure 2.1.
TLOW
THIGH
THD:STA
TR
TSU:STO
TF
SMCLK
THD:STA
THD:DAT TSU:DAT
TSU:STA
SMDATA
TBUF
S
P
S
S - Start Condition
P - Stop Condition
P
Figure 2.1 System Management Bus Timing Diagram
The EMC1043 implements a subset of the SMBus specification and supports Write Byte, Read Byte,
Send Byte, and Receive Byte protocols as shown. In the tables that describe the protocol, the “gray”
columns indicate that the slave is driving the bus.
All of the below protocols use the following convention:
DATA SENT
TO DEVICE
DATA SENT TO
THE HOST
# of bits sent
2.3.1
# of bits sent
Write Byte
The Write Byte is used to write one byte of data to the registers as shown in Table 2.3.
Table 2.3 Write Byte Protocol
START
SLAVE ADDRESS
WR
ACK
COMMAND
ACK
DATA
ACK
STOP
1
7
1
1
8
1
8
1
1
2.3.2
Read Byte
The Read Byte protocol is used to read one byte of data from the registers as shown in Table 2.4.
Table 2.4 Read Byte Protocol
START
SLAVE
ADDRESS
SMSC EMC1043
WR
ACK
COMMAND
ACK
START
9
DATASHEET
SLAVE
ADDRESS
RD
ACK
DATA
NACK
STOP
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1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Table 2.4 Read Byte Protocol
1
7
2.3.3
1
1
8
1
1
7
1
1
8
1
1
Send Byte
The Send Byte protocol is used to set the Internal Address Register to the correct Address as shown
in Table 2.5. The Send Byte can be followed by the Receive Byte protocol described in Table 2.6 to
read data from the register. The send byte protocol cannot be used to write data - if data is to be
written to a register then the write byte protocol must be used as described in Section 2.3.1.
Table 2.5 Send Byte Protocol
START
SLAVE ADDR
WR
ACK
REG. ADDR
ACK
STOP
1
7
1
1
8
1
1
2.3.4
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 can be used for consecutive
reads of the same register as shown in Table 2.6.
Table 2.6 Receive Byte Protocol
START
SLAVE ADDR
RD
ACK
REG. DATA
NACK
STOP
1
7
1
1
8
1
1
2.3.5
SMBus Timing Diagram
The Timing for the SMBus is shown in Figure 2.1.
2.4
SMBus Addresses
The EMC1043 may be ordered with one of four slave addresses as shown in Ordering Information.
Attempting to communicate with the EMC1043 SMBus interface with an invalid slave address or invalid
protocol results in no response from the device and does not affect its register contents. The EMC1043
supports stretching of the SMCLK signal by other devices on the SMBus but will not perform this
operation itself.
2.5
SMBus Timeout
The EMC1043 includes an SMBus time-out feature. Following a 25 ms period of inactivity on the
SMBus, the device will time-out and reset the SMBus interface.
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SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Chapter 3 Product Description
The EMC1043 is an SMBus sensor that monitors three temperature zones for use in a personal
computer or embedded environment. The part may be used as a companion to one of SMSC’s broad
line of SIO host devices to perform fan control and thermal management.
The EMC1043-1, EMC1043-2, EMC1043-3 and EMC1043-4 are designed specifically to work with a
CPU that implements the thermal diode as a PNP substrate transistor with the collector connected to
GND. A new feature called beta compensation automatically compensates for measurement error
caused by beta variation in CPU thermal diodes as described in Section 3.7.
Because the beta compensation circuit is designed to work with PNP substrate transistors, the
EMC1043-1, EMC1043-2, EMC1043-3 and EMC1043-4 are not typically used with diode-connected
transistors (such as the 2N3904) or CPUs that implement the thermal diode as a two-terminal diode
(such as the AMD processor). However, the beta compensation feature may be disabled by configuring
the appropriate register as described in Section 4.8. For applications that measure a two-terminal
thermal diode, refer to the EMC1063.
A typical system is shown in Figure 3.1
CPU
Thermal
Diode
EMC1043
Host
DP1
DN1
SMBus
Remote diode-connected transistor
SMBus
Interface
DP2
DN2
Internal
Diode
Figure 3.1 EMC1043 System Drawing
3.1
Power Modes
The EMC1043 has two power modes.
3.2
„
Run Mode - In this mode, the temperature monitors are active and converting at the programmed
conversion rate. The average power dissipation will depend on the conversion rate. When the
EMC1043 is not actively converting a channel, it goes into a lower power wait state.
„
Standby Mode (power-up default) - in this mode, the EMC1043 is put into a low power state. In the
standby mode, temperature monitoring is disabled. The device will still respond to SMBus
commands.
One Shot During Standby Mode
The EMC1043 supports a One-Shot command when it is in Standby Mode. Writing to the One-Shot
register will cause the device to power up, perform 1 full set of temperature conversions, then return
to Standby Mode.
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1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
3.3
Operation During Run Mode
When the device is active, there are two modes of operation available.
3.3.1
„
Normal Mode (power-up default) - In this mode of operation, the EMC1043 continuously samples
and updates all of its temperature channels.
„
Hotter of Two Mode - In this mode, the EMC1043 continuously samples and then compares the
two remote zones. The hotter of the two remote zones is loaded into the External Diode 2 Data
Registers. In addition, the HOTTER bit in the Status register is set or cleared to indicate which
external diode zone is hotter. If the two remote zones are exactly equal to each other, then the
HOTTER bit is cleared (set to ‘0’), and the results of the two remote zones are stored in their
respective registers.
Conversion Rates
The EMC1043 may be configured for different conversion rates based on the system requirements.
The available rates are 1 full set of conversions per second to 16 full sets of conversions per second.
The conversion rate is configured as described in Section 4.4. The available conversion rates are
shown in Table 4.4.
3.3.2
Dynamic Averaging
The EMC1043 temperature channels support a new feature that measures the external diode channels
for an extended time based on the selected conversion rate. This functionality can be disabled as
described in Section 4.5 for increased power savings at the lower conversion rates. When Dynamic
Averaging is enabled, the device will automatically adjust the sampling and measurement time for both
external diode channels. This allows the device to average 2x or 4x longer than the normal 11 bit
operation 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 on the
temperature measurement.
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.
The Dynamic Averaging will affect the average supply current based on the chosen conversion rate
as shown in Table 3.1.
Table 3.1 Supply Current vs. Conversion Rate and ADC Averaging Factor
ADC AVERAGING FACTOR
4X
(MAX_RES = 1)
(DA_N = 0)
CONVERSION RATE
2X
(MAX_RES = 0)
(DA_N = 0)
1X
(DA_N = 1)
1 / sec
190uA
132uA
105uA
2 / sec
315uA
205uA
150uA
4 / sec
580uA
350uA
235uA
8 / sec
N/A
640uA
405uA
16 / sec
N/A
N/A
750uA
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SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
3.4
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 then proportional to absolute
temperature as shown in the following equation:
where:
ΔVBE = VBE _ HIGH − VBE _ LOW =
ηkT ⎛ I HIGH ⎞
q
⎟⎟
ln⎜⎜
⎝ I LOW ⎠
k = Boltzmann’s constant
T = absolute temperature in Kelvin
[1]
q = electron charge
η = diode ideality factor
IHIGH
ILOW
Substrate
PNP
DP
AntiAliasing
Filter
Resistance
Error
Correction
ΔΣ
ADC
DN
Figure 3.2 Block Diagram of Temperature Monitoring Circuit
Figure 3.2 shows a block diagram of the temperature measurement circuit. The negative terminal for
the remote temperature diode, DN, is internally biased with a forward diode voltage referenced to
ground.
The EMC1043-1, EMC1043-2, EMC1043-3 and EMC1043-4 are designed to work with the PNP
substrate transistor in a CPU. The External Diode 2 channel in the EMC1043-5 has beta compensation
disabled by default.
The external diodes in all versions of the EMC1043 are compatible with a broad range of thermal
diodes that may be connected as shown in Figure 3.3 (see Section 4.8 for programming details when
using diode-connected transistors as the external diodes).
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1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
t
D
o
P
t
D
o
N
Local
Ground
Typical
substrate
remote
i.e. CPU
substrate
transistor
PNP
Typical
remote
discrete PNP transistor
i.e.
2N3906
t
D
o
P
t
D
o
P
t
D
o
N
t
D
o
N
Typical
remote
discrete NPN transistor
i.e.
2N3904
Figure 3.3 External Diode Configurations
3.5
Temperature Measurement Results and Data
Each temperature result for each zone is available in two byte wide data registers. As shown in
Section 4.1, the 11-bit format has the 8 most significant bits stored in the high byte register and the 3
least significant bits stored in the three MSB positions of the low byte register. The delta-sigma ADC
may be operated with more than 11 bits of resolution for improved averaging as described in
Section 4.5, but the temperature result is reported at 11-bit resolution.
The temperature results for the two remote zones are also stored in extended format with a range from
-64°C to +191°C. The data format is a 2’s complement number offset by 64°C as shown in Section 4.2.
The data for each of the remote zones in both legacy and extended format is stored in separate data
registers so that both data formats are always available. Table 3.2 shows the default and extended
range formats.
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SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Table 3.2 EMC1043 Temperature Data Format
RANGE -64°C TO 127°C
RANGE -64°C TO 191°C
BINARY
OFFSET BINARY
TEMPERATURE (°C)
Diode Fault
100 0000 0000
100 0000 0000
<= -64
110 0000 0000
100 0000 0000
-63.875
110 0000 0001
100 0000 0001
-63
110 0000 1000
100 0000 1000
-1
111 1111 1000
101 1111 1000
0
000 0000 0000
110 0000 0000
0.125
000 0000 0001
110 0000 0001
1
000 0000 1000
110 0000 1000
64
010 0000 0000
000 0000 0000
65
010 0000 1000
000 0000 1000
127
011 1111 1000
001 1111 1000
127.875
011 1111 1111
001 1111 1111
128
011 1111 1111
010 0000 0000
191
011 1111 1111
011 1111 1000
>= 191.875
011 1111 1111
011 1111 1111
3.6
Resistance Error Correction (REC)
Resistance error correction is an automatic feature that eliminates the need to characterize and
compensate for series resistance in the external diode lines. The EMC1043 corrects for as much as
100 ohms of series resistance.
When using a temperature sensor that does not include resistance error correction, voltage developed
across the parasitic resistance in the external diode path produces an error in the reported
temperature. The error introduced by this resistance is approximately +0.7°C per ohm. Sources of
series resistance are PCB trace resistance, on die (i.e. on the processor) metal resistance, bulk
resistance in the base and emitter of the temperature transistor.
When monitoring the thermal diode of an AMD K8 processor, the Resistance Error Correction must be
disabled for accurate temperature measurements. This is accomplished by clearing the REC bit in the
configuration 2 register (see Section 4.5). Please see Application note “13.16 - Using the EMC1043
with AMD Processors” for more details.
3.7
Beta Compensation
The Beta Compensation function automatically eliminates temperature errors caused by beta variation
in modern, low beta transistors used for monitoring processor temperatures. Changes in beta as
differing currents are applied to temperature transistors can cause significant temperature errors in
monitoring devices. As modern processor geometries shrink the trend is for transistor betas to
decrease, which exacerbates temperature errors.
SMSC EMC1043
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1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Discrete transistors, with collector connected to base to form a diode, are generally immune to these
temperature errors because of high (>100) betas. A beta variation of 10% from low current to high
current, when beta equals 100, induces approximately 0.12° error at 100°C. However for a low beta
(1.0) substrate transistor used for processor temperature measurement, a beta variation of 10% from
low to high current induces approximately 6.12° error at 100°C.
Because the Beta Compensation function is designed to be used with substrate PNP transistors only,
this function should be disabled when using a diode-connected transistor (such as the 2N3904) or
CPUs that implement the thermal diode as a two-terminal device. The Beta Compensation function is
disabled by writing 07h to the Beta Configuration register
When measuring an AMD K8 processor, the Beta Compensation circuitry must be disabled. See
Section 4.8. Please see SMSC Application note “13.16 - Using the EMC1043 with AMD Processors”
for more details.
3.8
Programmable Ideality Factor
The EMC1043 default is for a diode ideality factor of 1.008 which is common for a 2N3904 diode and
for many processor transistors. When a diode or transistor is used that has a different ideality factor
value than 1.008 a temperature error is induced that is a linear function of temperature. Previous
solutions for this mismatch in ideality factor has been to supply a programmable offset to the
temperature reading which corrects the error at a single temperature but causes a residual error at all
other temperatures. The EMC1043 ideality factor register corrects this mismatch error at all
temperatures (see Section 4.7).
APPLICATION NOTE: When monitoring a substrate transistor or CPU diode and beta compensation is enabled, the
Ideality Factor should not be adjusted. Beta Compensation automatically corrects for most
ideality errors.
3.9
Diode Faults
The EMC1043 detects a fault if the DP pin is left floating or is shorted to VDD. In the case of a diode
fault, the corresponding status bit will be set and the output data will be set at 400h.
Revision 1.44 (04-14-08)
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DATASHEET
SMSC EMC1043
Revision 1.44 (04-14-08)
The following registers are accessible through the SMBus Interface.
Table 4.1 EMC1043 Register Set
REGISTER
ADDRESS
WRITE
R/W
REGISTER NAME
SYMBOL
B7
B6
B5
00h
N/A
R
Internal Temperature
High Byte - Legacy
Format
INTHBL
Sign
64
32
23h
N/A
R
Internal Temperature
Low Byte - Legacy
Format
INTLBL
0.5
0.25
0.125
01h
N/A
R
External Diode 1 High
Byte - Legacy Format
ET1HBL
Sign
64
32
10h
N/A
R
External Diode 1 Low
Byte - Legacy Format
ET1LBL
0.5
0.25
0.125
F8h
N/A
R
External Diode 2 High
Byte - Legacy Format
ET2HBL
Sign
64
32
F9h
N/A
R
External Diode 2 Low
Byte - Legacy Format
ET2LBL
0.5
0.25
0.125
FAh
N/A
R
External Diode 1 High
Byte - Extended
Format
ET1HBE
128
64
32
FBh
N/A
R
External Diode 1 Low
Byte - Extended
Format
ET1LBE
0.5
0.25
0.125
FCh
N/A
R
External Diode 2 HIgh
Byte - Extended
Format
ET2HBE
128
64
32
B4
16
B3
8
B2
4
B1
2
B0
1
DEFAULT
VALUE
00h
00h
16
8
4
2
1
00h
17
DATASHEET
READ
00h
16
8
4
2
1
00h
00h
16
8
4
2
1
00h
00h
16
8
4
2
1
00h
SMSC EMC1043
Datasheet
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Chapter 4 Register Set and Description
REGISTER
ADDRESS
READ
WRITE
R/W
REGISTER NAME
SYMBOL
FDh
N/A
R
External Diode 2 Low
Byte - Extended
Format
ET2LBE
B7
0.5
B6
0.25
B5
B4
B3
B2
B1
B0
0.125
DEFAULT
VALUE
00h
Status and Control
02h
N/A
R
Status
STS
Busy
-
-
HOTT
ER
-
-
03h
09h
R/W
Configuration
CFG
-
ADC_ST
OP
-
-
-
CR<2:0>
04h
04h
R/W
Configuration 2
CFG2
-
-
-
-
MAX_
RES
DA_n
D2
D1
00h
45h
COMP
REC
09h
18
DATASHEET
One Shot
N/A
0Fh
W
One Shot Conversion
Shot
The data written to this register is irrelevant and will not be stored
00h
Ideality
27h
27h
R/W
External Diode 1
Ideality Correction
Factor
IDCF1
-
-
B5
B4
B3
B2
B1
B0
12h
(1.008)
28h
28h
R/W
External Diode 2
Ideality Correction
Factor
IDCF2
-
-
B5
B4
B3
B2
B1
B0
12h
(1.008)
29h
29h
R/W
External Diode 1 Beta
Configuration
BCF1
-
-
-
-
-
BETA<2:0>
03h
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Revision 1.44 (04-14-08)
Table 4.1 EMC1043 Register Set (continued)
SMSC EMC1043
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
VALUE
READ
WRITE
R/W
REGISTER NAME
SYMBOL
2Ah
2Ah
R/W
External Diode 2 Beta
Configuration
BCF2
-
-
-
-
-
BETA<2:0>
EDh
EDh
R
Product ID
PID
0
0
0
0
1
1
0
0
0Ch (-1)
0
0
0
0
1
1
0
1
0Dh (-2)
0
0
0
0
1
1
1
0
0Eh (-3)
0
0
0
0
1
1
1
1
0Fh (-4)
0
0
1
0
1
1
0
0
2Ch (-5)
03h (07h for
EMC10435)
FEh
FEh
R
Manufacturer ID
SMSC
0
1
0
1
1
1
0
1
5Dh
FFh
FFh
R
Revision Register
REV
-
-
-
-
0
0
0
1
01h
During Power on Reset (POR), the default values are stored in the registers. A POR is initiated when power is first applied to the part and the voltage
on the VDD supply surpasses the POR level as specified in the electrical characteristics. Any reads to undefined registers will return 00h. Writes to
undefined registers will not have an effect.
Revision 1.44 (04-14-08)
REGISTER
ADDRESS
19
DATASHEET
Datasheet
The EMC1043 uses an interlock mechanism that will update the Low byte of a particular monitor when the High Byte is read. This prevents changes
in register content when the ADC updates between successive reads.
4.1
Legacy Temperature Data Registers (00h, 23h, 01h, 10h, F8h, F9h)
As shown in Table 4.1, each temperature monitor has two data registers. The 11 bit temperature data is stored aligned to the left resulting in the High
Byte containing temperature in 1°C steps and the Low Byte containing fractions of a degree.
4.2
Extended Format Temperature Registers (FAh-FDh)
The Extended Format Temperature Registers store only the external diode temperatures in the extended data format. This is because, due to the
operating range limitations of the EMC1043, the internal temperature could not benefit from the extended temperature range. Like the Legacy data
formatting, the data is stored in two registers per temperature channel.
SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Table 4.1 EMC1043 Register Set (continued)
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
4.3
Status Register - 02h
Table 4.2 Status Register
ADDR
02h
REGISTER
Status
B7
Busy
B6
B5
-
B4
-
B3
HOTTER
-
B2
-
B1
D2
B0
D1
DEFAULT
00h
The Status Register is a read only register and returns the operational status of the part. External diode
faults are indicated by bits 1 and 0. If either bit is set to ‘1’, then a diode fault has occurred. When a
diode fault occurs, the D1 or D2 status bit is set, but otherwise the data remains unchanged.
Bit 7 - Busy - indicates that the ADC is currently converting a temperature.
Bit 4 - HOTTER - during Hotter of Two mode, this bit indicates which of the external diode channels
is hotter. If this bit is ‘0’, then External Diode 1 is hotter or equal to External Diode 2. If this bit is ‘1’,
then External Diode 2 is hotter than External Diode 1. During normal operation, this bit will always read
a ‘0’.
Bit 1 - D2 - indicates that a diode fault has occurred on External Diode 2.
Bit 0 - D1 - indicates that a diode fault has occurred on External Diode 1.
4.4
Configuration Register (03h Read, 09h Write)
Table 4.3 Configuration Register
ADDR
03h Read,
09h Write
REGISTER
Config
B7
-
B6
STANDBY
B5
-
B4
-
B3
-
B2
B1
CR<2:0>
B0
DEFAULT
45h
The Configuration Register controls the basic functionality of the EMC1043. The bits are described
below:
Bit 6 - STANDBY- controls the ADC conversions and power modes of the part.
„
'0' - The device is in the run operating mode. The ADC is converting at the user-programmed
conversion rate.
„
'1' - (default) The device is in the standby operating mode (see Section 3.1).
Bit 2-0 - CR<2:0> - determines the conversion rate for the temperature monitoring per Table 4.4.
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SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Table 4.4 Conversion Rate
CR<2:0>
2
1
CONVERSIONS / SECOND
(CONVERSION TIME)
0
0
0
0
Reserved
0
0
1
Reserved
0
1
0
Reserved
0
1
1
1 Conversion / sec
1
0
0
2 Conversions / sec
1
0
1
4 Conversions / sec (default)
1
1
0
8 Conversions / sec
1
1
1
16 Conversions / sec
4.5
Configuration 2 Register - (04h)
Table 4.5 Configuration 2 Register
ADDR
04h
REGISTER
CFG2
B7
-
B6
-
B5
-
B4
-
B3
MAX_RES
B2
B1
B0
DA_n
COMP
REC
DEFAULT
09h
The Configuration 2 Register controls the basic functionality of the EMC1043 that is NOT compatible
with the EMC1023.
Bit 3 - MAX_RES - controls the external diode conversion time during dynamic averaging. Although
the dynamic averaging may be used to increase the ADC resolution, only 11 bits of data are available
in the temperature registers.
„
‘0’ - the dynamic averaging will set the ADC averaging factor at 1x when the conversion rate is set
at 16 conversions per second and 2x at conversion rates lower than 16 per second.
„
‘1’ (default) - the dynamic averaging will set the ADC averaging factor at 1x when the conversion
rate is set at 16 conversions per second, 2x at 8 conversions / second and 4x at conversion rates
lower than 8 per second.
Bit 2 - DA_n - controls the dynamic digital averaging circuitry. See Section 3.3.2.
„
‘0’ (default) - dynamic averaging is enabled. Depending on the selected conversion rate, the ADC
averaging factor is increased for the external diodes.
„
‘1’ - dynamic averaging is disabled. The ADC averaging factor will remain fixed at 1x for all
conversion rates and will allow increased power savings at the slower conversion rates.
Bit 1 - COMP - configures the device to perform a comparison for the Hotter of Two mode (see Section
3.3, "Operation During Run Mode," on page 12.)
„
‘0’ (default) - the device is in normal mode
„
‘1’ - the device is in Hotter of Two mode. In this mode, the two external diode channels are
measured and compared against each other. The hotter of the two channels has its data loaded
into the External Diode 2 Data Registers. The Internal Diode and External Diode 1 Data Registers
remain unaffected.
SMSC EMC1043
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1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Bit 0 - REC - controls the Resistance Error Correction circuitry
4.6
„
'0' - The Resistance Error Correction circuitry is disabled.
„
'1' (default) - The Resistance Error Correction circuitry is active and will automatically correct for
up to 100 ohms of series resistance in the diode lines for both External Diode 1 and External Diode
2 channels.
One Shot Register - (0Fh)
Table 4.6 One Shot Registers
ADDR
0Fh
REGISTER
One Shot
Conversion
B7
B6
B5
B4
B3
B2
B1
B0
Writing to this register address initiates the one-shot. The data is not
important and is not stored
DEFAULT
00h
The One Shot Register is an address place holder for the one-shot command. Writing to the address
initiates the command. The data written is not important and is not stored. Reading from the one-shot
registers will always return 00h.
4.7
Ideality Configuration Registers (27h - 28h)
Table 4.7 Ideality Configuration Registers
ADDR
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
27h
Diode 1 Ideality
Correction Factor
-
-
B5
B4
B3
B2
B1
B0
12h
(1.008)
28h
Diode 2 Ideality
Correction Factor
-
-
B5
B4
B3
B2
B1
B0
12h
(1.008)
The Ideality Configuration Registers store the ideality correction factor that is applied to each external
diode.
The table below shows the ideality factor settings for the Ideality Configuration registers. Shading
indicates power-up default. All codes that are not listed are reserved and should not be used.
Beta Compensation and Resistance Error Correction automatically correct for most diode ideality
errors, therefore it is not recommended that these settings be updated without consulting SMSC.
Revision 1.44 (04-14-08)
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DATASHEET
SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Table 4.8 Ideality Factor Look Up Table
SETTING
FACTOR
SETTING
FACTOR
SETTING
FACTOR
001000
0.9951
011000
1.0159
101000
1.0377
001001
0.9964
011001
1.0173
101001
1.0391
001010
0.9976
011010
1.0186
101010
1.0404
001011
0.9989
011011
1.0199
101011
1.0418
001100
1.0002
011100
1.0213
101100
1.0432
001101
1.0015
011101
1.0226
101101
1.0446
001110
1.0028
011110
1.0240
101110
1.0460
001111
1.0041
011111
1.0253
101111
1.0475
010000
1.0054
100000
1.0267
110000
1.0489
010001
1.0067
100001
1.0280
110001
1.0503
010010
1.0080
100010
1.0294
010011
1.0093
100011
1.0308
010100
1.0106
100100
1.0321
010101
1.0119
100101
1.0335
010110
1.0133
100110
1.0349
010111
1.0146
100111
1.0363
For CPU substrate transistors that require the BJT transistor model, the ideality factor behaves slightly
differently than for discrete diode-connected transistors. Refer to Table 4.9 when using a CPU
substrate transistor.
Table 4.9 Substrate Diode Ideality Factor Look-Up Table (BJT Model)
SETTING
FACTOR
SETTING
FACTOR
SETTING
FACTOR
001000
0.9869
011000
1.0079
101000
1.0291
001001
0.9882
011001
1.0092
101001
1.0304
001010
0.9895
011010
1.0105
101010
1.0317
001011
0.9908
011011
1.0120
101011
1.0330
001100
0.9921
011100
1.0132
101100
1.0343
001101
0.9934
011101
1.0146
101101
1.0356
001110
0.9947
011110
1.0159
101110
1.0369
001111
0.9960
011111
1.0173
101111
1.0382
010000
0.9973
100000
1.0187
110000
1.0395
SMSC EMC1043
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DATASHEET
Revision 1.44 (04-14-08)
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Table 4.9 Substrate Diode Ideality Factor Look-Up Table (BJT Model) (continued)
SETTING
FACTOR
SETTING
FACTOR
010001
0.9986
100001
1.0200
010010
1.0000
100010
1.0213
010011
1.0013
100011
1.0226
010100
1.0026
100100
1.0239
010101
1.0039
100101
1.0252
010110
1.0053
100110
1.0265
010111
1.0066
100111
1.0278
SETTING
FACTOR
110001
1.0408
APPLICATION NOTE: When measuring a 65nm Intel CPUs, the Ideality Setting should be the default 12h. When
measuring 45nm Intel CPUs, the Ideality Setting should be 15h.
4.8
Beta Configuration Registers (29h - 2Ah)
Table 4.10 Beta Configuration Registers
ADDR
REGISTER
B7
B6
B5
B4
B3
B2
B1
29h
Diode 1 Beta
Configuration
-
-
-
-
-
BETA<2:0>
2Ah
Diode 2 Beta
Configuration
-
-
-
-
-
BETA<2:0>
B0
DEFAULT
03h
03h
(07h for
EMC10435)
The Beta Configuration Registers have a factory programmed power-on default based on the beta of
the PNP substrate transistor that is being monitored as the external diode. The default value of the
Diode 2 Beta Configuration Register of EMC1043-5 is 07h (disabled).
The beta compensation circuit is able to compensate for beta variation within a given range. The beta
configuration register is configured to the proper range to match the CPU to be monitored. The beta
values should be set so that the minimum expected beta is not below the threshold indicated in
Table 4.11. Beta compensation is activated if the BETA<2:0> bits are set to any value other than 07h.
When using diode-connected transistors (such as the 2N3904) or CPUs that implement the thermal
diode as a two-terminal diode, the Beta Configuration Register should be set to 07h.
Table 4.11 Beta Configuration Look Up Table
BETA<2:0>
2
1
0
MINIMUM BETA
0
0
0
0.11
0
0
1
0.18
0
1
0
0.25
Revision 1.44 (04-14-08)
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DATASHEET
SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Table 4.11 Beta Configuration Look Up Table (continued)
BETA<2:0>
2
1
0
MINIMUM BETA
0
1
1
0.33 (default)
1
0
0
0.43
1
0
1
1.00
1
1
0
2.33
1
1
1
Disabled
4.9
Product ID Register (EDh)
Table 4.12 Product ID Register
ADDR
EDh
REGISTER
B7
PID
B6
0
B5
0
B4
X
0
B3
B2
1
B1
1
B0
X
X
DEFAULT
0Ch
0Dh
0Eh
0Fh
2Ch
(-1)
(-2)
(-3)
(-4)
(-5)
The Product ID Register holds the unique product ID for identifying SMSC EMC products. See
Table 4.1 for a list of the product ID number for each version of the EMC1043.
4.10
Manufacturer ID Register (FEh)
Table 4.13 Manufacturer ID Register
ADDR
FEh
REGISTER
SMSC
B7
0
B6
1
B5
0
B4
1
B3
1
B2
1
B1
0
B0
1
DEFAULT
5Dh
The Manufacturer ID register contains an 8 bit word that identifies the manufacturer of the EMC1043
(SMSC = 5Dh).
4.11
Revision Register (FFh)
Table 4.14 Revision Register
ADDR
FFh
REGISTER
REV
B7
-
B6
-
B5
-
B4
-
B3
0
B2
0
B1
0
B0
1
DEFAULT
01h
The Revision register contains a 4 bit word that identifies the die revision.
SMSC EMC1043
25
DATASHEET
Revision 1.44 (04-14-08)
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Chapter 5 Typical Operating Curves
Tem perature Error vs. Filter Capacitor
(2N3904, TA = 27°C, TDIODE = 27°C, VDD = 3.3V)
Supply Curre nt vs . Conve rs ion Rate
(TA = 27°C, V DD = 3.3V )
800
0.5
Temperature Error (°C)
Supply Current (uA)
700
600
500
400
300
200
100
0.3
0.0
-0.3
-0.5
-0.8
-1.0
0
0
1
2
4
8
16
1000
2000
3000
4000
Filter Capacitor (pF)
Conve rs ion Rate (conv / s e c)
2.0
Tem perature Error vs. External Diode Tem perature
(2N3904, TA=42.5°C, VDD = 3.3V)
2.0
1.5
1.5
Temperature Error (°C)
Temperature Error (°C)
Tem perature Error vs. Am bient Tem perature
(2N3904, TDIODE = 27°C, VDD = 3.3V)
1.0
0.5
0.0
-0.5
-1.0
-1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.0
0
15
30
45
60
Am bient Tem perature (°C)
Revision 1.44 (04-14-08)
75
90
0
26
DATASHEET
25
50
75
100
External Diode Tem perature (°C)
125
SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Te m pe r ature Err or vs . Le ak age Re s is tance
(2N3904, TA = T DIODE = 27°C, V DD = 3.3V )
30.0
Standby Current vs. Supply Voltage
(TA = 27°C)
3.0
DP to GND
Standby Current (uA)
Temperature Error(°C)
20.0
10.0
0.0
-10.0
-20.0
-30.0
DP to VDD
2.5
2.0
1.5
1.0
0.5
0.0
-40.0
1
10
2.9
100
3.1
Le ak age Re s is tance (M Ω )
45
0.5
30
0.3
REC Active
0.0
0
20
40
60
80
15
Temperature Error (°C)
60
REC Disabled
4
Beta Compensation Disabled
3
2
1
Beta Compensation Enabled
0
-1
0
100
20
30
40
50
60
70
80
90
100
CPU Temperature (°C)
Series Resitance (Ω)
SMSC EMC1043
3.7
5
Temperature Error
(°C) REC Disabled
Temperature Error
(°C) REC Active
75
0.8
3.5
Temperature Error vs. CPU Temperature
Typical 65nm CPU from major vendor
(TA = 27°C, VDD = 3.3V, BETA = 011, CFILTER = 0pF)
Temperature Error vs. Series Resistance
2N3904, TA = TDIODE = 27°C, VDD = 3.3V
1.0
3.3
Supply Voltage (V)
27
DATASHEET
Revision 1.44 (04-14-08)
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Chapter 6 Package Outline
Figure 6.1 8-Pin MSOP Package Outline - 3x3mm Body 0.65mm Pitch
Table 6.1 8-Pin MSOP Package Parameters
MIN
NOMINAL
MAX
REMARKS
A
0.80
~
1.10
Overall Package Height
A1
0.05
~
0.15
Standoff
A2
0.75
0.85
0.95
Body Thickness
D
2.80
3.00
3.20
X Body Size
E
4.65
4.90
5.15
Y Span
E1
2.80
~
3.20
Y body Size
H
0.08
~
0.23
Lead Foot Thickness
L
0.40
~
0.80
Lead Foot Length
L1
0.95 REF
e
Lead Length
0.65 BSC
Lead Pitch
θ
0o
W
0.22
~
0.38
Lead Width
ccc
~
~
0.10
Coplanarity
~
8o
Lead Foot Angle
Notes:
1. Controlling Unit: millimeters.
2. Tolerance on the true position of the leads is ± 0.065 mm maximum.
3. Package body dimensions D and E1 do not include mold protrusion or flash. Dimensions D and
E1 to be determined at datum plane H. Maximum mold protrusion or flash is 0.15mm (0.006 inches)
per end, and 0.15mm (0.006 inches) per side.
4. Dimension for foot length L measured at the gauge plane 0.25 mm above the seating plane.
5. Details of pin 1 identifier are optional but must be located within the zone indicated.
Revision 1.44 (04-14-08)
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DATASHEET
SMSC EMC1043
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
6.1
Package Markings
All devices will be marked on the first line of the top side with “1043”. On the second line, they will be
marked with the appropriate -X number (-1, -2, etc), the Functional Revision “B” and Country Code
(CC) .
SMSC EMC1043
29
DATASHEET
Revision 1.44 (04-14-08)
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