EMC1187 Triple Channel 1C Temperature Sensor with Hardware Thermal Shutdown and 1.8V SMBus Communications Datasheet PRODUCT FEATURES General Description Applications Notebook Computers The EMC1187 is a high accuracy, low cost, 1.8V System Desktop Computers Management Bus (SMBus) compatible temperature sensor. Industrial Advanced features such as Resistance Error Correction (REC), Embedded applications Beta Compensation (to support CPU diodes requiring the BJT/transistor model including 65nm and lower geometry Features processors) and automatic diode type detection combine to Hardware Thermal Shutdown provide a robust solution for complex environmental monitoring triggers dedicated SYS SHDN pin applications. The ability to communicate at 1.8V SMBus levels hardware configured range 77C to 112C in 1C steps provides compatible I/O for the advanced processors found in cannot be disabled or modified by software todays tablet and smartphone applications. Support for diodes requiring the BJT/transistor model Supports 65nm and lower geometry CPU thermal The EMC1187 monitors three temperature channels (two diodes external and one internal), providing 1C accuracy for both external and internal diode temperatures. Pin and register compatible with EMC1423 Automatically determines external diode type and Additionally, the EMC1187provides a hardware programmable optimal settings system shutdown feature that is programmed at part power-up Resistance Error Correction via two pull-up resistor values and that cannot be masked or Frequency hops the remote sample frequency to reject corrupted through the SMBus. DC converter and other coherent noise sources* Consecutive Alert queue to further reduce false Alerts REC automatically eliminates the temperature error caused by Up to 2 External Temperature Monitor series resistance allowing greater flexibility in routing thermal 25C typ, 1C max accuracy (20C < T < 110C) DIODE diodes. Frequency hopping* and analog filters ensure remote 0.125C resolution diode traces can be as far as eight (8) inches without degrading Supports up to 2.2nF diode filter capacitor the signal. Beta Compensation eliminates temperature errors Internal Temperature Monitor caused by low, variable beta transistors common in today s fine 1C accuracy geometry processors. The automatic beta detection feature 0.125C resolution monitors the external diode/transistor and determines the 3.3V Supply Voltage optimum sensor settings for accurate temperature 1.8V SMBus operation measurements regardless of processor technology. This frees Programmable temperature limits for ALERT (85C the user from providing unique sensor configurations for each default high limit and 0C default low limit) temperature monitoring application. These advanced features Available in small 10-pin 3mm x 3mm DFN RoHS compliant package plus 1C measurement accuracy provide a low-cost, highly flexible and accurate solution for critical temperature monitoring applications. VDD Switching EMC1187 SYS SHDN Limit Current VDD = 3.3V 1.8V 3.3V Conversion Rate Register DP1 VDD Host CPU EMC1187 DN1 External DP1 Thermal Low Limit Registers Analog Temperature SMCLK DP2 ADC diode Mux Register(s) DN1 High Limit Registers SMDATA SMBus DN2 Internal Internal Interface Temperature Diode ALERT Register DP2 SYS SHDN Power SMCLK DN2 Control Internal Temp Diode Configuration Register SMDATA Status Registers Interupt Masking ALERT SYS SHDN GND * Technology covered under the US patent 7,193,543. SMSC EMC1187 Revision 1.0 (07-11-13) DATASHEET Digital Mux Limit Comparator Digital Mux SMBus InterfaceTriple Channel 1C Temperature Sensor with Hardware Thermal Shutdown and 1.8V SMBus Communications Datasheet Ordering Information: SMBUS ORDERING NUMBER PACKAGE FEATURES ADDRESS EMC1187-1-AIA-TR 10-pin DFN 3mm x 3mm Up to three temperature sensors, hardware 1001 1100(r/w) (RoHS compliant) set system shutdown, ALERT and SYS SHDN pins, fixed SMBus address This product meets the halogen maximum concentration values per IEC61249-2-21 For RoHS compliance and environmental information, please visit www.smsc.com/rohs Please contact your SMSC sales representative for additional documentation related to this product such as application notes, anomaly sheets, and design guidelines. Copyright 2013 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