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PDF EMC1438 Data sheet ( Hoja de datos )
| Número de pieza | EMC1438 | |
| Descripción | Multiple Temperature Sensor | |
| Fabricantes | SMSC | |
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EMC1438
1°C Multiple Temperature Sensor
with Hardware Controlled Standby &
Hottest of Multiple Zones
PRODUCT FEATURES
Datasheet
General Description
The EMC1438 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 hardware controlled STANDBY pin
allows for system level power shutdown to support
energy saving initiatives.
The EMC1438 monitors up to eight temperature
channels (up to seven external and one internal). The
device provides ±1°C accuracy for the internal and
external diode temperatures.
Temperature monitoring includes two tiers of protection:
one that can be masked and causes the ALERT pin to
be asserted, and the other that cannot be masked and
causes the THERM pin to be asserted.
Applications
Notebook Computers
Desktop Computers
Industrial
Embedded Applications
Features
Hardware Set Standby Mode
— 200uA (typical) quiescent current in Standby
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 (40°C < TDIODE < 110°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
— ±1°C Accuracy
— 0.125°C Resolution
Programmable temperature limits for ALERT and
THERM
3.3V Supply Voltage
SMBus 2.0 interface
— Pin-selectable SMBus address
— Block Read and Write
Available in a 16-pin 4mm x 4mm QFN Lead-free
RoHS Compliant package
Block Diagram
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
11 bit Σ Δ
ADC
Voltage to Temp
Conversion
Voltage Register
Temp Registers
Hottest of
Comparison
SMBus
Slave
Protocol
ADDR_SEL
SMCLK
SMDATA
ALERT
THERM
STANDBY
SMSC EMC1438
DATASHEET
Revision 1.0 (04-29-10)
1 page  
1°C Multiple Temperature Sensor with Hardware Controlled Standby & Hottest of Multiple Zones
Datasheet
List of Figures
Figure 2.1
Figure 4.1
Figure 5.1
Figure 5.2
Figure 7.1
Figure 7.2
Figure 7.3
Figure 7.4
EMC1438 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
System Diagram for EMC1438 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Diode Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
16-Pin QFN 4mm x 4mm Package Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
16-Pin QFN 4mm x 4mm PCB Footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
16-Pin QFN 4mm x 4mm Package Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
EMC1438 Package Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
SMSC EMC1438
5
DATASHEET
Revision 1.0 (04-29-10)
5 Page 
1°C Multiple Temperature Sensor with Hardware Controlled Standby & Hottest of Multiple Zones
Datasheet
3.2 Electrical Specifications
Table 3.2 Electrical Specifications
VDD = 3.0V to 3.6V, TA = -40°C to 125°C, all typical values at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL MIN TYP MAX UNITS
CONDITIONS
Supply Voltage
Supply Current
Standby Supply Current
Temperature Accuracy
Temperature Resolution
Temperature Accuracy
Temperature Resolution
Conversion Time all
Channels
Capacitive Filter
Resistance Error
Correction
Output Low Voltage
Leakage Current
Input High Voltage
Input Low Voltage
Input High/Low Current
VDD
IDD
IDD
ISTBY
tCONV
DC Power
3.0 3.3
3.6
395 450
V
uA
700 960
uA
200 uA
Internal Temperature Monitor
±0.25 ±1
°C
±2 °C
0.125
°C
External Temperature Monitor
±0.25 ±1
°C
±0.5
0.125
170
±2
°C
°C
ms
1 conversion / sec, dynamic
averaging disabled
4 conversions / sec, dynamic
averaging enabled
Monitoring disabled.
0°C < TA < 100°C
-40°C < TA < 125°C
+40°C
0°C <
T<AT<DI1O1D0E°C<
+110°C
-40°C < TDIODE < 127°C
default settings
CFILTER
RSERIES
2.2 2.7
nF
100 Ω
Connected across external diode
In series with DP and DN lines
ALERT and THERM pins
VOL
ILEAK
0.4 V
ISINK = 8mA
±5 uA powered or unpowered
TpAull<-u8p5v°Coltage < 3.6V
SMCLK, SMDATA, and STANDBY pins
VIH
VIL
IIH / IIL
2.0
-0.3
VDD
V
0.8 V
±5 uA
5V Tolerant
5V Tolerant
Powered or unpowered
TA < 85°C
SMSC EMC1438
11
DATASHEET
Revision 1.0 (04-29-10)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EMC1438.PDF ] | |
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