EMC2302 Dual RPM-Based PWM Fan Controller Datasheet PRODUCT FEATURES General Description Features Two Programmable Fan Control circuits (EMC2302) The EMC2302 is an SMBus compliant fan controller with 4-wire fan compatible up to two independently controlled PWM fan drivers. High speed PWM (26 kHz) Each fan driver is controlled by a programmable Low speed PWM (9.5Hz - 2240 Hz) frequency PWM driver and Fan Speed Control algorithm Optional detection of aging fans that operates in either a closed loop fashion or as a Fan Spin Up Control and Ramp Rate Control directly PWM-controlled device. Alert on Fan Stall Watchdog Timer The closed loop Fan Speed Control algorithm (FSC) has RPM-based fan control algorithm the capability to detect aging fans and alert the system. 0.5% accuracy from 500 RPM to 16k RPM (external It will likewise detect stalled or locked fans and trigger crystal oscillator) an interrupt. 1% accuracy from 500 RPM to 16k RPM (internal clock) Additionally, the EMC2302 offers a clock output so that SMBus 2.0 Compliant multiple devices may be chained and slaved to the SMBus Alert compatible same clock source for optimal performance in large CLK Pin can provide a clock source output distributed systems. Available in a 10-pin MSOP Lead-free RoHS Compliant package Applications Servers Projectors Industrial and Networking Equipment Notebook Computers Block Diagram CLK TACH1 Tachometer Tach Limit Measurement Registers TACH2 SMCLK SMBus Slave SMDATA Protocol ALERT PWM1 Fan Speed Control Algorithm PWM Drivers PWM2 Fan Speed Control Algorithm SMSC EMC2302 DATASHEET Revision 1.3 (05-18-11) Dual RPM-Based PWM Fan Controller Datasheet Order Number(s): ORDERING NUMBER PACKAGE FEATURES EMC2302-1-AIZL-TR 10-pin MSOP (Lead-free Two RPM-based fan speed control RoHS compliant) algorithms. SMBus address 0101 110(r/w) EMC2302-2-AIZL-TR 10-pin MSOP (Lead-free Two RPM-based fan speed control RoHS compliant) algorithms. SMBus address 0101 111(r/w) This product meets the halogen maximum concentration values per IEC61249-2-21 For RoHS compliance and environmental information, please visit www.smsc.com/rohs 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000 or 1 (800) 443-SEMI Copyright 2011 SMSC or its subsidiaries. All rights reserved. Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC s standard Terms of Sale Agreement dated before the date of your order (theTerms of Sale Agreemen). The product may contain design defects or errors known as anomalies which may cause the product s functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSCs website at