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PDF EMC1428 Data sheet ( Hoja de datos )
| Número de pieza | EMC1428 | |
| Descripción | Multiple Temperature Sensor | |
| Fabricantes | SMSC Corporation | |
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EMC1428
1°C Multiple Temperature
Sensor with HW Thermal
Shutdown & Hottest of
Thermal Zones
PRODUCT FEATURES
Datasheet
General Description
The EMC1428 is a high accuracy, low cost, System
Management Bus (SMBus) temperature sensor.
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.
Additionally, the EMC1428 provides a hardware
programmable system shutdown feature that is
programmed at part power-up via a single TRIP_SET
voltage channel 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 EMC1428 monitors up to eight
temperature channels (up to seven external and one
internal).
Applications
Notebook Computers
Desktop Computers
Industrial
Embedded Applications
Features
Hardware Thermal Shutdown
— triggers dedicated SYS_SHDN pin
— hardware configured range 65°C to 127°C in 1°C steps
— cannot be disabled or modified by software
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 seven 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
— ±2°C accuracy
3.3V Supply Voltage
Available in a 16 pin 4mm x 4mm QFN lead-free
RoHS Compliant package
Programmable temperature limits for ALERT
Block Diagram
TRIP_SET
SYS_SHDN
DP1
DN1
DP2 / DN3
DN2 / DP3
DP4 / DN5
DN4 / DP5
DP6 / DN7
DN6 / DP7
External
Temp
Diode
Inputs
Anti-
parallel
diode
Analog
Mux
Internal
Temp
Diode
Critical / Thermal
Shutdown Logic
11 bit Σ Δ
ADC
Voltage to Temp
conversion
Voltage Register
Temp Registers
Hottest of Comparison
SMBus
Slave
Protocol
SMCLK
SMDATA
ALERT
SMSC EMC1428
DATASHEET
Revision 0.62 (03-05-08)
1 page  
1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones
Datasheet
List of Figures
Figure 1.1
Figure 3.1
Figure 4.1
Figure 4.2
Figure 4.3
Figure 4.4
Figure 6.1
Figure 6.2
Figure 6.3
EMC1428 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System Diagram for EMC1428 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Block Diagram of Hardware Thermal Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Vset Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Diode Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
16 pin QFN 4mm x 4mm Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
16 pin QFN 4mm x 4mm Package Drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
16 pin QFN 4mm x 4mm PCB Footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
SMSC EMC1428
5
DATASHEET
Revision 0.62 (03-05-08)
5 Page 
1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones
Datasheet
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
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 Setup Time
Clock Low Period
Clock High Period
Clock/Data Fall time
Clock/Data Rise time
Clock/Data Rise time
Capacitive Load
fSMB
tSP
tBUF
tHD:STA
tSU:STA
tSU:STP
tHD:DAT
tSU:DAT
tLOW
tHIGH
tFALL
tRISE
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
0.3 us
100 ns
1.3 us
0.6 us
300 ns
300 ns
1000 ns
400 pF
5V Tolerant
5V Tolerant
Powered or unpowered
TA < 85°C
SMDATA = 0.4V
Min = 20+0.1CLOAD ns
Min = 20+0.1CLOAD ns
fSMB > 100kHz
Min = 20+0.1CLOAD ns
fSMB < 100kHz
per bus line
SMSC EMC1428
11
DATASHEET
Revision 0.62 (03-05-08)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EMC1428.PDF ] | |
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