EMC1423_12 Datasheet, PDF (1/51 Pages) SMSC Corporation – 1°C Temperature Sensor with Hardware Thermal Shutdown

EMC1423/EMC1424
1°C Temperature Sensor with
Hardware Thermal Shutdown
PRODUCT FEATURES
Datasheet
General Description
The EMC1423 and EMC1424 are high accuracy, low
cost, System Management Bus (SMBus) temperature
sensors. Advanced features such as Resistance Error
Correction (REC), Beta Compensation (to support CPU
diodes requiring the BJT/transistor model including
45nm, 65nm and 90nm processors) and automatic
diode type detection combine to provide a robust
solution for complex environmental monitoring
applications.
Additionally, the EMC1423 and EMC1424 provide 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.
Each device provides ±1° accuracy for external diode
temperatures and ±2°C accuracy for the internal diode
temperature. The EMC1423 monitors three temperature
channels (two external and one internal). The EMC1424
monitors four temperature channels (three external and
one internal).
Resistance Error Correction automatically eliminates the
temperature error caused by series resistance allowing
greater flexibility in routing thermal diodes. Beta
Compensation eliminates temperature errors caused by
low, variable beta transistors common in today's fine
geometry processors. The automatic beta detection
feature monitors each 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.
Applications
„ Notebook Computers
„ Desktop Computers
„ Industrial
„ Embedded applications
Features
„ Hardware Thermal Shutdown
— 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 45nm, 65nm, and 90nm CPU thermal diodes.
„ Automatically determines external diode type and
optimal settings
„ Resistance Error Correction
„ External Temperature Monitors
— ±1°C Accuracy (60°C < T_DIODE < 100°C)
— 0.125°C Resolution
— Supports up to 2.2nF diode filter capacitor
— Anti-parallel diodes for extra diode support
„ Internal Temperature Monitor
— ±2°C accuracy
„ 3.3V Supply Voltage
„ Programmable temperature limits for ALERT
„ Available in Small 10-pin MSOP Lead-free RoHS
Compliant Package
SMSC EMC1423/EMC1424
DATASHEET
Revision 2.0 (08-10-12)