EMC2102 Datasheet, PDF (1/52 Pages) SMSC Corporation – RPM-Based Fan Controller with HW Thermal Shutdown

EMC2102
RPM-Based Fan
Controller with HW
Thermal Shutdown
PRODUCT FEATURES
Datasheet
GENERAL DESCRIPTION
The EMC2102 is an SMBus, closed-loop, RPM-based
fan controller/driver with hardware (HW) thermal
shutdown and reset controller. The EMC2102 is
packaged in a thermally enhanced, compact, 5x5, 28-
pin lead-free RoHS compliant QFN package.
The EMC2102 utilizes Beta Compensation and
Resistance Error Correction (REC) to accurately monitor
three external temperature zones. These features allow
great accuracy for CPU substrate thermal diodes on
multiple process geometries as well as with discrete
diode-connected transistors. Both Beta Compensation
and REC can be disabled on the EMC2102 to maintain
accuracy when monitoring AMD thermal diodes.
The EMC2102 includes a closed-loop RPM based Fan
Control Algorithm that integrates a linear fan driver
capable of sourcing 600mA of current. The fan control
algorithm is designed to work with fans that operate up
to 16,000 RPMs.
The EMC2102 provides a stand-alone HW thermal
shutdown block. The HW thermal shutdown logic can be
configured for a few common configurations based on
the strapping level of the SHDN_SEL pin on the PCB.
The HW thermal shutdown point can be set in 1°C
increments by using a discrete resistor divider
implemented on the TRIP_SET pin.
The EMC2102 also provides 5V supply ‘power good’
function with a threshold of 4.5V. This function is
provided on the RESET# pin.
FEATURES
„ Beta Compensation Allows Accurate Temperature
Measurement on 65nm CPU/GPUs
„ Closed-Loop RPM Based Fan Controller
— Accepts External Clock Source To Achieve 2%
Accuracy
„ Integrated Linear Fan Driver
— 600mA Drive Capability
„ HW Thermal Shutdown (SYS_SHDN#)
— 1°C Incremental Set Points For Thermal Shutdown
— Cannot be disabled by software
„ Provides Reset Function (RESET#) On 5V Supply
„ Three Remote Thermal Zones
— ±1°C Accuracy (60°C to 100°C)
— 1°C Resolution
„ Resistance Error Correction On Thermal ‘Diode’
Channels
— Eliminates Temperature Offset Due To Series
Resistance From PCB Traces And Thermal ‘Diode’
„ Thermally Enhanced, 28-pin, 5x5 QFN Lead-free
RoHS Compliant Package
„ Operates From Single 3.0 - 3.6V Supply
— 5V Supply For Linear Fan Driver
„ Software Configurable ALERT# Signal For Diode
Fault, Fan Stall Or System Warning
APPLICATIONS
„ Notebook Computers
„ Desktop Computers
„ Embedded Applications
SMSC EMC2102
DATASHEET
Revision 1.95 (10-19-06)