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PDF EMC1422 Data sheet ( Hoja de datos )
| Número de pieza | EMC1422 | |
| Descripción | Temperature Sensor | |
| Fabricantes | SMSC Corporation | |
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EMC1422
1°C Temperature Sensor with
Hardware Thermal Shutdown
PRODUCT FEATURES
Datasheet
General Description
The EMC1422 is a high accuracy, low cost, System
Management Bus (SMBus) temperature sensor.
Advanced features such as Resistance Error Correction
(REC), Beta Compensation (to support CPU diodes
requiring the BJT/transistor model including 45nm,
65nm and 90nm processors) and automatic diode type
detection combine to provide a robust solution for
complex environmental monitoring applications.
Additionally, the EMC1422 provides a hardware
programmable system shutdown feature that is
programmed at part power-up via two pull-up resistor
values and that cannot be masked or corrupted through
the SMBus.
Each device provides ±1° accuracy for external diode
temperatures and ±2°C accuracy for the internal diode
temperature. The EMC1422 monitors two temperature
channels (one external and one internal).
Resistance Error Correction automatically eliminates the
temperature error caused by series resistance allowing
greater flexibility in routing thermal diodes. Beta
Compensation eliminates temperature errors caused by
low, variable beta transistors common in today's fine
geometry processors. The automatic beta detection
feature monitors the external diode/transistor and
determines the optimum sensor settings for accurate
temperature measurements regardless of processor
technology. This frees the user from providing unique
sensor configurations for each temperature monitoring
application. These advanced features plus ±1°C
measurement accuracy provide a low-cost, highly
flexible and accurate solution for critical temperature
monitoring applications.
Applications
Notebook Computers
Desktop Computers
Industrial
Embedded applications
Features
Hardware Thermal Shutdown
— triggers dedicated SYS_SHDN pin
— hardware configured range 77°C to 112°C in 1°C steps
— cannot be disabled or modified by software
Support for diodes requiring the BJT/transistor model
— supports 45nm, 65nm, and 90nm CPU thermal diodes.
Pin compatible with ADM1032, MAX6649, and LM99
Automatically determines external diode type and
optimal settings
Resistance Error Correction
External Temperature Monitors
— ±1°C Accuracy (60°C < TDIODE < 100°C)
— 0.125°C Resolution
— Supports up to 2.2nF diode filter capacitor
Internal Temperature Monitor
— ±2°C accuracy
3.3V Supply Voltage
Programmable temperature limits for ALERT
Available in Small 8-pin MSOP Lead-free RoHS
Compliant Package
SMSC EMC1422
DATASHEET
Revision 2.0 (08-10-12)
1 page  
1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
List of Figures
Figure 1.1
Figure 2.1
Figure 4.1
Figure 5.1
Figure 5.2
Figure 5.3
Figure 5.4
Figure 5.5
Figure 5.6
Figure 5.7
Figure 8.1
EMC1422 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
EMC1422 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System Diagram for EMC1422 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Block Diagram of Hardware Thermal Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Isolating ALERT and SYS_SHDN Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Temperature Filter Step Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Temperature Filter Impulse Response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Block Diagram of Temperature Monitoring Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Diode Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8-Pin MSOP / TSSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
SMSC EMC1422
5
DATASHEET
Revision 2.0 (08-10-12)
5 Page 
1°C Temperature Sensor with Hardware Thermal Shutdown
Datasheet
3.3 SMBus Electrical Characteristics
Table 3.3 SMBus Electrical Specifications
VDD = 3.0V to 3.6V, TA = -40°C to 125°C, all typical values are at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL MIN TYP MAX UNITS
CONDITIONS
Input High Voltage
Input Low Voltage
Input High/Low Current
VIH
VIL
IIH / IIL
Hysteresis
Input Capacitance
Output Low Sink Current
CIN
IOL
Clock Frequency
Spike Suppression
Bus free time Start to
Stop
Hold Time: Start
Setup Time: Start
Setup Time: Stop
Data Hold Time
Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
Clock/Data Fall time
Clock/Data Rise time
Capacitive Load
fSMB
tSP
tBUF
tHD:STA
tSU:STA
tSU:STP
tHD:DAT
tHD:DAT
tSU:DAT
tLOW
tHIGH
tFALL
tRISE
CLOAD
SMBus Interface
2.0 VDD V
-0.3 0.8 V
±5 uA
420 mV
5 pF
8.2 15 mA
SMBus Timing
10 400 kHz
50 ns
1.3 us
0.6 us
0.6 us
0.6 us
0 us
0.3 us
100 ns
1.3 us
0.6 us
300 ns
300 ns
400 pF
5V Tolerant
5V Tolerant
Powered or unpowered
TA < 85°C
SMDATA = 0.4V
When transmitting to the master
When receiving from the master
Min = 20+0.1CLOAD ns
Min = 20+0.1CLOAD ns
per bus line
SMSC EMC1422
11
DATASHEET
Revision 2.0 (08-10-12)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EMC1422.PDF ] | |
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