smsc emc2105 product preview revision 1.78 (04-21-09) data brief product features emc2105 rpm-based high side fan controller with hardware thermal shutdown general description the emc2105 is an smbus co mpliant fan controller with up to five (up to 4 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 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 1c 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 emc2105 also includes a hardware programmable temperature limit and de dicated system shutdown output for thermal protection of critical circuitry. applications ? notebook computers ? embedded applications ? projectors ? industrial and networking equipment features ? programmable fan control circuit ? 600ma, 5v, high side fan driver ? optional detection of aging fans ? rpm based fan control algorithm ? 2% accuracy from 500rpm to 16k rpm ? temperature look-up table ? allows programmed fan response to temperature ? 1 to 4 thermal zones to control fan driver ? controls fan speed or drive setting ? allows externally generated temperature data to control fan drivers including two dts channels ? up to four external temperature channels ? designed to support 45nm, 60nm, and 90nm cpus ? automatically detects and s upports cpus requiring the bjt or transistor models ? resistance error correction ? 1c accurate (60c to 100c) ? 0.125c resolution ? detects fan aging and variation ? up to three thermistor compatible voltage inputs ? hardware programmable thermal shutdown temperature ? cannot be altered by software ? 60c to 122c range or 92c to 154c range ? programmable high and low limits for all channels ? 3.3v supply voltage ? smbus 2.0 compliant ? smbus alert compatible ? available in 20-pin qfn package - lead free rohs compliant (4mm x 4mm)
order number: 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 relati ng 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 re sponsibility is assumed for inaccuracies. smsc reserves the right to make changes to specifications and product descriptions at any time without notice. contact your local sm sc 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 semicond uctor 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 te rms and conditions of the most recently dated version of smsc's standard terms of sale agreement dated before the date of your order (the "terms of sale agreement"). the pro duct may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. anomaly sheets are availab le 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 smsc?s website at h ttp://www.smsc.com. smsc is a registered trademark of standard microsystems corporation (?smsc?). produc t names and company names are th e trademarks of their respective holders. smsc disclaims and excludes any and all warranties, including without limitation an y and all implied warranties of merchantabil ity, fitness for a particular purpose, title, and against infringement and the like, and any and all warranties arising from any cou rse of dealing or usage of trade. in no event shall smsc be liabl e for any direct, incidental, indi rect, special, punitive, or cons equential damages; or for lost data, profits, savings or revenues of any kind; regardless of the form of action, whether based on contrac t; tort; negligence of smsc or others; strict liability; breach of warranty; or otherwise; whether or not any remedy of buyer is h eld to have failed of its essential purpose, and whether or no t smsc has been advised of the possibility of such damages. ordering number package features emc2105-bp 20 pin qfn (lead-free rohs compliant) single high side fan driver, up to 4 external diode measurement channels, one critical / thermal shutdown input rpm-based high side fan controller with hardware thermal shutdown revision 1.78 (04-21-09) 2 smsc emc2105 product preview
rpm-based high side fan controller with hardware thermal shutdown smsc emc2105 3 revision 1.78 (04-21-09) product preview block diagram figure 1 emc2105 block diagram analog mux external temp diodes internal temp diode 11 bit adc temp registers smbus slave protocol fan driver configuration dp1 dn1 smclk smdata temp limit registers dp2 dn2 alert# thermal shutdown logic sys_shdn# tachs tach1 lookup table / rpm control clk_in* shdn_sel trip_set* vdd gnd vin1* * denotes multiple pin functions vdd_5v fan_out reference vref* dn4 / dp3* dp4 / dn3* vin2* gpio gpio1* anti- parallel diode
rpm-based high side fan controller with hardware thermal shutdown revision 1.78 (04-21-09) 4 smsc emc2105 product preview package outline qfn 20-pin 4mm x 4mm figure 2 emc2105 20-pin 4x4mm qfn package outline and parameters
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