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EMC1184 Datasheet(PDF) 1 Page - SMSC Corporation

Part # EMC1184
Description  Quad Channel 1째C Temperature Sensor with Beta
Download  48 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

EMC1184 Datasheet(HTML) 1 Page - SMSC Corporation

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SMSC EMC1184
Revision 1.0 (07-11-13)
DATASHEET
Datasheet
PRODUCT FEATURES
EMC1184
Quad Channel 1°C Temperature Sensor with Beta
Compensation and 1.8V SMBus Communications
General Description
The EMC1184 is a high accuracy, low cost, 1.8V System
Management Bus (SMBus) compatible temperature sensor.
Advanced features such as Resistance Error Correction (REC),
Beta Compensation (to support CPU diodes requiring the
BJT/transistor model including 65nm and lower geometry
processors) and automatic diode type detection combine to
provide a robust solution for complex environmental monitoring
applications. The ability to communicate at 1.8V SMBus levels
provides compatible I/O for the advanced processors found in
today’s tablet and smartphone applications.
The EMC1184 monitors four temperature (three external and
one internal) channels, providing ±1°C accuracy for both
external and internal diode temperatures.
REC automatically eliminates the temperature error caused by
series resistance allowing greater flexibility in routing thermal
diodes. Frequency hopping* and analog filters ensure remote
diode traces can be as far as eight (8) inches without degrading
the signal. 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 sett ings 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
Programmable SMBus address
Support for diodes requiring the BJT/transistor model
Supports 65nm and lower geometry CPU thermal
diodes
Pin and register compatible with EMC1414
Automatically determines external diode type and
optimal settings
Resistance Error Correction
Frequency hops the remote sample frequency to reject
DC converter and other coherent noise sources*
Consecutive Alert queue to further reduce false Alerts
Up to 3 External Temperature Monitors
25°C typ, ±1°C max accuracy (20°C < TDIODE < 110°C)
0.125°C resolution
Supports up to 2.2nF diode filter capacitor
Anti-parallel diodes for extra diode support
Internal
Temperature Monitor
±1°C accuracy
0.125°C resolution
3.3V Supply Voltage
1.8V SMBus operation
Programmable temperature limits for ALERT/THERM2
(85°C default high limit and 0°C default low limit) and
THERM (85°C default)
Available in small 10-pin 3mm x 3mm DFN RoHS
compliant package
* Technology covered under the US patent 7,193,543.
Internal Temp
Diode
Switching
Current
Analog
Mux
Internal
Temperature
Register
Low Limit Registers
High Limit Registers
Conversion Rate Register
Interupt Masking
Status Registers
Configuration Register
THERM / ADDR
SMCLK
SMDATA
DP1
DN1
VDD
GND
External
Temperature
Register(s)
ΔΣ ADC
THERM Limit Register
THERM Hysteresis Register
SMBus Address Decode
ALERT / THERM2
EMC1184
DP2 / DN3
DN2 / DP3
CPU /
GPU
EMC1184
Host
DP1
DN1
SMDATA
Thermal
Junction
SMCLK
SMBus
Interface
THERM / ADDR
ALERT / THERM2
Power
Control
VDD
GND
VDD =
3.3V
1.8V
DN2 / DP3
DP2 / DN3
Anti-Parallel
Diode
1.8V-3.3V


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