EMC1184
Quad Channel 1°C Temperature Sensor with Beta
Compensation and 1.8V SMBus Communications
Datasheet
PRODUCT FEATURES
General Description
Applications
Notebook Computers
Desktop Computers
Industrial
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.
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
The EMC1184 monitors four temperature (three external and
one internal) channels, providing ±1°C accuracy for both
external and internal diode temperatures.
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
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 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.
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—
—
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
VDD
VDD =
3.3V
EMC1184
1.8V 1.8V-3.3V
CPU /
GPU
DP1
VDD
Conversion Rate Register
Host
Thermal
Junction
Switching
Current
DN1
Low Limit Registers
High Limit Registers
THERM Limit Register
SMCLK
SMCLK
DP1
DN1
Analog
Mux
SMDATA
EMC1184
DP2 / DN3
SMBus
External
Temperature
Register(s)
SMDATA
Interface
DP2 / DN3
DN2 / DP3
ΔΣ ADC
ALERT / THERM2
THERM Hysteresis Register
Anti-Parallel
Diode
Internal
Temperature
Register
THERM / ADDR
Power
Control
Internal Temp
Diode
DN2 / DP3
GND
Interupt Masking
SMBus Address Decode
Configuration Register
ALERT / THERM2
THERM / ADDR
Status Registers
GND
* Technology covered under the US patent 7,193,543.
SMSC EMC1184
Revision 1.0 (07-11-13)
DATASHEET