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EMC2303 Datasheet(PDF) 1 Page - SMSC Corporation |
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EMC2303 Datasheet(HTML) 1 Page - SMSC Corporation |
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1 / 51 page  SMSC EMC2303 DATASHEET Revision 1.1 (10-12-09) Datasheet PRODUCT FEATURES EMC2303 Multiple RPM-Based PWM Fan Controller General Description The EMC2303 is an SMBus compliant fan controller with up to three independently controlled PWM fan drivers. Each fan driver is controlled by a programmable frequency PWM driver and Fan Speed Control algorithm that operates in either a closed loop fashion or as a directly PWM-controlled device. The closed loop Fan Speed Control algorithm (FSC) has the capability to detect aging fans and alert the system. It will likewise detect stalled or locked fans and trigger an interrupt. Additionally, the EMC2303 offers a clock output so that multiple devices may be chained and slaved to the same clock source for optimal performance in large distributed systems. Applications Servers Projectors Industrial and Networking Equipment Notebook Computers Features Three Programmable Fan Control circuits (EMC2303) — 4-wire fan compatible — High speed PWM (26 kHz) — Low speed PWM (9.5Hz - 2240 Hz) — Optional detection of aging fans — Fan Spin Up Control and Ramp Rate Control — Alert on Fan Stall — Up to 3 Selectable Default Fan Speeds Watchdog Timer RPM-based fan control algorithm — 0.5% accuracy from 500 RPM to 16k RPM (external crystal oscillator) — 1% accuracy from 500 RPM to 16k RPM (internal clock) SMBus 2.0 Compliant — Up to 6 selectable SMBus addresses — SMBus Alert compatible CLK Pin can provide a clock source output Available in a 12-pin 4mm x 4mm QFN Lead-free RoHS Compliant package Block Diagram SMBus Slave Protocol PWM Drivers SMCLK SMDATA Tachometer Limit Registers PWM1 Tach Measurement TACH1 CLK ADDR_SEL ALERT# PWM2 Fan Speed Control Algorithm Fan Speed Control Algorithm Fan Speed Control Algorithm TACH2 PWM3 TACH3 |
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