SMSC EMC2103

PRODUCT PREVIEW

Revision 0.93 (01-08-10)

Data Brief

PRODUCT FEATURES

EMC2103

RPM-Based Fan Controller with

Hardware Thermal Shutdown

General Description

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.

Applications

Notebook Computers

Projectors

Graphics Cards

Industrial and Networking Equipment

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

— 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

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)