EMC2113
RPM-Based Fan Controller with
Multiple Temperature Zones &
Hardware Thermal Shutdown
PRODUCT FEATURES
General Description
The EMC2113 is an SMBus compliant fan controller.
The fan driver can be operated using two methods, each
with two modes. The methods include an RPM-based
Fan Speed Control Algorithm and a direct PWM drive
setting. The modes include manually programming the
desired settings or using the internal programmable
temperature look-up table to select the desired setting
based on measured temperature.
The EMC2113 includes a temperature monitor that
measures up to three (3) external diodes and the
internal diode. The temperature monitors offer 1°C
accuracy (for external diodes) with sophisticated
features to reduce errors introduced by series resistance
and beta variation of substrate thermal diode transistors
commonly found in processors.
The device includes high and low limits for all
temperature channels as well as a hardware set critical
temperature limit. This hardware set limit drives a
dedicated system shutdown pin.
Finally, the device includes an open-drain, active low
interrupt pin to flag temperature or fan control errors.
Datasheet
Features
Programmable Fan Control circuit
— 4-wire fan compatible
— Both Low and High frequency PWM
RPM-based fan control algorithm
— 2% accurate from 500 RPM to 16k RPM
— Automatic Tachometer feedback
Temperature Look-Up Table
— Controls fan speed or PWM drive setting
— Eight steps that incorporate up to four temperature
zones simultaneously (user selectable)
— Supports forced DTS or standard temperature data
— Allows external PWM input (150Hz to 40kHz)
Up to Three External Temperature Channels
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Supports transistor model for 90nm - 45nm Intel CPUs
Resistance Error Correction and Beta Compensation
1°C accurate (60°C to 125°C)
0.125°C resolution
Programmable High and Low limits
Hardware Programmable Thermal Shutdown
Temperature
— Cannot be altered by software
— 65°C to 127°C Range
— Dedicated system shutdown interrupt pin
Applications
Notebook Computers
Projectors
Graphics Cards
Industrial and Networking Equipment
Internal Temperature Monitor
— ±1°C accuracy
— 0.125°C resolution
3.3V Supply Voltage
Open drain interrupt pin
SMBus 2.0 Interface
— SMBus Alert compatible
— Selectable SMBus Address via pull-up resistor and
ADDR_SEL pin
— Block Read and Write
Available in 16-pin 4mm x 4mm QFN Lead-free
RoHS Compliant package
SMSC EMC2113
DATASHEET
Revision 1.2 (10-08-09)
SMSC [ SMSC CORPORATION ]
