EMC2105 RPM-Based High Side Fan Controller with Hardware Thermal Shutdown Datasheet PRODUCT FEATURES General Description Features Programmable Fan Control circuit The EMC2105 is an SMBus compliant fan controller with 600mA, 5V, High Side Fan Driver up to five (up to 4 external and 1 internal) temperature Optional detection of aging fans channels. The fan driver can be operated using two RPM based fan control algorithm methods each with two modes. The methods include an 2% accuracy from 500RPM to 16k RPM RPM based Fan Speed Control Algorithm and a direct Temperature Look-Up Table drive setting. The modes include manually programming Allows programmed fan response to temperature the desired settings or using the internal programmable 1 to 4 thermal zones to control fan driver temperature look-up table to select the desired setting Controls fan speed or drive setting based on measured temperature. Allows externally generated temperature data to control fan drivers including two DTS channels The temperature monitors offer 1C accuracy (for Up to Four External Temperature Channels external diodes) with sophisticated features to reduce Designed to support 45nm, 60nm, and 90nm CPUs errors introduced by series resistance and beta variation Automatically detects and supports CPUs requiring the of substrate thermal diode transistors commonly found BJT or Transistor models in processors. Resistance error correction 1C accurate (60C to 100C) The EMC2105 also includes a hardware programmable 0.125C resolution temperature limit and dedicated system shutdown Detects fan aging and variation output for thermal protection of critical circuitry. Up to three thermistor compatible voltage inputs Hardware Programmable Thermal Shutdown Applications Temperature Notebook Computers Cannot be altered by software Embedded Applications 60C to 122C Range or 92C to 154C Range Projectors Programmable High and Low Limits for all channels Industrial and Networking Equipment 3.3V Supply Voltage SMBus 2.0 Compliant SMBus Alert compatible Available in 20-pin QFN Package - Lead Free RoHS compliant (4mm x 4mm) SMSC EMC2105 DATASHEET Revision 1.78 (04-21-09) RPM-Based High Side Fan Controller with Hardware Thermal Shutdown Datasheet ORDER NUMBER: ORDERING NUMBER PACKAGE FEATURES EMC2105-BP 20 pin QFN Lead-Free Single High Side Fan driver, up to 4external RoHS compliant diode measurement channels, one Critical / Thermal Shutdown input REEL SIZE IS 4,000 PIECES 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright 2009 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