EMC2103
RPM-Based Fan
Controller with HW
Thermal Shutdown
PRODUCT FEATURES
The EMC2103 is an SMBus compliant fan controller with
up to up to 3 external and 1 internal temperature
channels. 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 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 EMC2103 also includes a hardware programmable
temperature limit and dedicated system shutdown
output for thermal protection of critical circuitry.
Datasheet
Features
Programmable Fan Control circuit
— 4-wire fan compatible
— High and low frequency PWM
RPM based fan control algorithm
— 2.5% accuracy from 500RPM to 16k RPM
— Detects fan aging and variation
Temperature Look-Up Table
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—
—
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Allows programmed fan response to temperature
Controls fan speed or PWM drive setting
Allows externally set temperature data to drive fan
Supports DTS data from CPU
Up to Three External Temperature Channels
(EMC2103-2 only)
— Supports 45nm, 60nm, and 90nm CPU diodes
— Automatically detects and supports CPUs requiring BJT
or Transistor models
— Resistance error correction
— Supports discrete transistors (i.e. 2N3904)
— 1°C accurate (60°C to 125°C)
— 0.125°C resolution
Applications
Notebook Computers
Projectors
Graphics Cards
Industrial and Networking Equipment
Hardware Programmable Thermal Shutdown
Temperature
— Cannot be altered by software
— 65°C to 127°C Range
Programmable High and Low Limits for all channels
Internal Temperature Monitor
— 2°C accuracy
— 0.125°C resolution
3.3V Supply Voltage
SMBus 2.0 Compliant
— SMBus Alert compatible
Two dedicated GPIOs (EMC2103-2 and EMC2103-4
only)
Available in 12-pin, QFN Lead-Free RoHS Compliant
Package (EMC2103-1 and EMC2103-3) or 16-pin,
QFN Lead-Free RoHS Compliant Package
(EMC2103-2 and EMC2103-4)
SMSC EMC2103
DATASHEET
Revision 0.85 (01-29-08)
SMSC [ SMSC CORPORATION ]
