EMC1186
Dual Channel 1°C Temperature Sensor with Hardware
Thermal Shutdown and 1.8V SMBus Communications
Datasheet
PRODUCT FEATURES
General Description
Applications
Notebook Computers
Desktop Computers
Industrial
The EMC1186 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
Hardware Thermal Shutdown
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—
—
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 65nm and lower geometry CPU thermal
diodes
The EMC1186 monitors two temperature channels (one
external and one internal), providing ±1°C accuracy for both
external and internal diode temperatures.
Pin and register compatible with EMC1422
Automatically determines external diode type and
optimal settings
Additionally, the EMC1186provides 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.
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 1 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
Internal Temperature Monitor
—
—
±1°C accuracy
0.125°C resolution
3.3V Supply Voltage
1.8V SMBus operation
Programmable temperature limits for ALERT (85°C
default high limit and 0°C default low limit)
Available in small 8-pin 2mm x 3mm TDFN RoHS
compliant package
Switchi
ng
Current
EMC1186
SYS_SHDN Limit
VDD = 3.3V
1.8V
– 3.3V
VDD
EMC1186
DP1
Conversion Rate Register
Host
CPU
Thermal
diode
External
Temperature
Register(s)
Low Limit Registers
High Limit Registers
Analog
Mux
DP1
DN1
SMCLK
ΔΣADC
DN1
Internal
Diode
SMDATA
SMBus
Internal
Temperature
Register
Interface
ALERT
Internal
Temp
Diode
SMCLK
SYS_SHDN
Configuration Register
SMDATA
ALERT
Power Control
Interupt
Masking
Status
Registers
SYS_SHDN
GND
* Technology covered under the US patent 7,193,543.
SMSC EMC1186
Revision 1.0 (07-11-13)
DATASHEET