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smsc emc1046/emc1047 datasheet revision 0.69 (06-29-09) datasheet product features emc1046/emc1047 1c multiple temperature sensor with beta compensation and hottest of thermal zones general description the emc1046/emc1047are high accuracy, low cost, system management bus (smbus) temperature sensors. advanced features such as resistance error correction (rec), beta compensation (to cpu diodes requiring the bjt or transistor model) and automatic diode type detection combine to provide a robust solution for complex environmental monitoring applications. each device provides 1 accuracy for external diode temperatures and 2c accuracy for the internal diode temperature. the emc1046/emc1047 monitor up to seven temperature channels (up to six external and one internal). applications ? notebook computers ? desktop computers ? industrial ? embedded applications features ? designed to support 45nm, 65nm, and 90nm cpu diodes ? supports diodes requiring the bjt or transistor model ? resistance error correct ion (up to 100 ohms) ? up to six external temperature monitors 1c accuracy (60c < t diode < 100c) 0.125c resolution supports up to 2.2nf filter capacitor anti-parallel diodes for extra diode support and compact design ? internal temperature monitor 2c accuracy ? 3.3v supply voltage ? available in a 10-pin tssop lead-free rohs compliant package block diagram analog mux external temp diodes internal temp diode 11 bit adc temp registers smbus slave protocol dp1 / dn6* dn1 / dp6* smclk smdat a dp2 / dn3 dn2 / dp3 dn4 / dp5 dp4 / dn5 anti- parallel diode * denotes emc1047 only hottest of comparison downloaded from: http:///
order numbers: reel size is 4,000 pieces ordering number package features diode modes supported smbus address emc1046-1-aizl-tr 10-pin tssop (lead-free rohs compliant) up to 5 external diodes. hottest of temperature comparison intel cpu, 3904, amd with setup 1001_100(r/w) EMC1046-6-AIZL-TR 10-pin tssop (lead-free rohs compliant) up to 5 external diodes. hottest of temperature comparison intel cpu, 3904, amd with setup 1001_101(r/w) emc1047-1-aizl-tr 10-pin tssop (lead-free rohs compliant) up to 6 external diodes. hottest of temperature comparison intel cpu, 3904, amd with setup 1001_100(r/w) emc1047-2-aizl-tr 10-pin tssop (lead-free rohs compliant) up to 6 external diodes. hottest of temperature comparison intel cpu, 3904, amd with setup 1001_000(r/w) 1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 2 smsc emc1046/emc1047 datasheet 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 product s are included as a means of illustrating typical applications. consequently, complete information sufficient for construction pur poses is not necessarily given. although the information has been checked and is bel ieved to be accurate, no responsibility is assumed for inaccuracies. smsc reserves t he right to make changes to specifications and product descriptio ns at any time without notice. contact your local smsc sales office to obtain the la test specifications before placing your product order. the provisi on of this information does not convey to the purchaser of the described semiconductor device s any licenses under any patent rights or other intellect ual property rights of smsc or others. all sales are expressly conditional on your agr eement to the terms and conditions of the most recently dated ve rsion of smsc's standard terms of sale agreement dated before the date of your order (the "terms of sale agreement"). the product may contain d esign 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 whe re 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 litera ture, as well as the terms of sale agreement, may be obtained by visiting smscs website at http://www.smsc.com. smsc is a registered trademark of standar d microsystems corporation (smsc). product names and company names are the trademarks of their respective holders. smsc disclaims and excludes any and al l warranties, including wi thout limitation any and all implied warranties of merchantability, fitness for a particular purpose, title, and against infringement and the like, and any and all warranties arising from any course of dealing or usage of trade. in no event shall smsc be liable for any direct, incidental, indirect, special, punitive, or consequential da mages; or for lost data, profits, savings or revenues of any kind; regardless of the form of action, whether based on contract; tort; negligence of smsc or others; strict liability; breach of warranty; or otherwise; whether or not any remedy of buyer is held to have failed of its essential purpose, and whether or not smsc has been advised of the possibility of such damages. downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 3 revision 0.69 (06-29-09) datasheet table of contents chapter 1 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 chapter 2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3 smbus electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 chapter 3 system management bus interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1 system management bus interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.2 write byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.3 read byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.4 send byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.5 receive byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.6 smbus address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.7 smbus timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 chapter 4 product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1 modes of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2 temperature monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.1 resistance error correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.2 beta compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.3 digital averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.4 hottest of comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.5 conversion rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.2.6 dynamic averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.3 diode connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.3.1 diode faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 chapter 5 register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.1 data read interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.2 temperature data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.3 status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.4 configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.5 conversion rate register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.6 limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.7 one shot register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.8 external diode fault register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.9 consecutive alert register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.10 beta configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.11 hottest temperature registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.12 hottest temperature status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.13 high limit status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.14 low limit status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.15 rec configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.16 hottest configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 5.17 channel configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 5.18 filter control register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 5.19 product id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 5.20 manufacturer id register (feh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 5.21 revision register (ffh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 4 smsc emc1046/emc1047 datasheet chapter 6 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.1 emc1046/emc1047 package drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.2 package markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.2.1 emc1046-x-aizl (10-pin tssop) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 chapter 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 7 downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 5 revision 0.69 (06-29-09) datasheet list of figures figure 1.1 emc1046/emc1047 pin diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 3.1 smbus timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 4.1 system diagram for emc1046/emc104 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 4.2 diode connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 6.1 10-pin tssop package drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 6 smsc emc1046/emc1047 datasheet list of tables table 1.1 emc1046/emc1047 pin description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 1.2 pin type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 2.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 2.2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 2.3 smbus electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 3.1 protocol format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 3.2 write byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 3.3 read byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 3.4 send byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 3.5 receive byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 4.1 supply current vs. conversion rate for emc1046/ emc1047 . . . . . . . . . . . . . . . . . . . . . . . . 16 table 5.1 register set in hexadecimal order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 table 5.2 temperature data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 table 5.3 temperature data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 table 5.4 status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 table 5.5 configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 5.6 conversion rate register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 5.7 conversion rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 5.8 maximum conversion rate per temperature channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 5.9 temperature limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 5.10 one shot register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 table 5.11 external diode fault register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 table 5.12 consecutive alert register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 table 5.13 consecutive alert settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 table 5.14 beta configuration register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 table 5.15 beta compensation look up table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 table 5.16 hottest temperature registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 table 5.17 hottest temperature register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 5.18 high limit status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 5.19 low limit status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 table 5.20 rec configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 table 5.21 hottest configuration register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 table 5.22 channel configuration register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 table 5.23 filter control register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 table 5.24 product id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 table 5.25 manufacturer id register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 table 5.26 revision register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 table 7.1 customer revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 7 revision 0.69 (06-29-09) datasheet chapter 1 pin description figure 1.1 emc1046/emc1047 pin diagram table 1.1 emc1046/emc1047 pin description pin number name function type 1 vdd power supply power 2 dp1 / dn6* dp1 - external diode 1 positive (anode) connection (emc1046) aio dp1 / dn6 - external diode 1 positive (anode) connection and external diode 6 negative (cathode) connection (emc1047) 3 dn1 / dp6* dn1 - external diode 1 negative (cathode) connection (emc1046) aio dn1 / dp6* - external diode 1 negative (cathode) connection and external diode 6 positive (anode) connection (emc1047) 4 dp2 / dn3 external diode 2 positive (anode) connection and external diode 3 negative (cathode) connection aio 5 dn2 / dp3 external diode 2 negative (cathode) connection and external diode 3 positive (anode) connection aio 6 gnd ground connection power 7 dn4 / dp5 external diode 4 negative (cathode) connection and external diode 5 positive (anode) connection aio emc1046 / 7 10 tssop 10 9 8 7 smdata smclk 1 2 3 4 vdd dp1 / dn6* dn1 / dp6* gnd 6 5 dp2 / dn3 dn2 / dp3 dp4 / dn5 dn4 / dp5 * denote emc1047 only downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 8 smsc emc1046/emc1047 datasheet the pin types are described below. all pins labelled (5v) are 5v tolerant. application note: for the 5v tolerant pins that have a pull-up resistor, the voltage difference between vdd and the pull-up voltage must never exceed 3.6v. 8 dp4 / dn5 external diode 4 positive (anode) connection and external diode 5 negative (cathode) connection aio 9 smdata smbus data input/output - requires external pullup resistor diod (5v) 10 smclk smbus clock input - requires external pullup resistor di (5v) table 1.2 pin type pin type function power used to supply either vdd or gnd to the device di 5v tolerant digital input od 5v tolerant open drain digital output. requires a pull-up resistor diod 5v tolerant bi-directional digital input / open-drain output. requires a pull-up resistor. aio analog input / output used for external diodes or analog inputs table 1.1 emc1046/emc1047 pin description (continued) pin number name function type downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 9 revision 0.69 (06-29-09) datasheet chapter 2 electrical specifications 2.1 absolute maximum ratings note: stresses at or above those listed could cause pe rmanent damage to the device. this is a stress rating only and functional operation of the devic e at any other condition above those indicated in the operation sections of this specification is not implied. when powering this device from laboratory or system power supplie s, it is important that the absolute maximum ratings not be exceeded or device failure can result. some po wer supplies exhibit voltage spikes on their outputs when the ac power is switched on or off. in addition, voltage transients on the ac power line may appear on the dc output. if this po ssibility exists, it is suggested that a clamp circuit be used. note 2.1 for the 5v tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed 3.6v when the device is unpowered. 2.2 electrical specifications table 2.1 absolute maximum ratings description rating unit supply voltage (v dd ) -0.3 to 4.0 v voltage on 5v tolerant pins (v 5vt_pin ) -0.3 to 5.5 v voltage on 5v tolerant pins (|v 5vt_pin - v dd |) (see note 2.1 ) -0.3 to 3.6 v voltage on any other pin to ground -0.3 to v dd +0.3 v operating temperature range -40 to +125 c storage temperature range -55 to +150 c lead temperature range refer to jedec spec. j-std- 020 package thermal charac teristics for msop-10 thermal resistance ( j-a ) 132.2 c/w esd rating, all pins hbm 2000 v table 2.2 electrical specifications v dd = 3.0v to 3.6v, t a = -40c to 125c, all typical values at t a = 27c unless otherwise noted. characteristic symbol min typ max units conditions dc power supply voltage v dd 3.0 3.3 3.6 v supply current i dd 395 450 ua 1 conversion / sec, dynamic averaging disabled supply current i dd 700 960 ua 4 conversions / sec, dynamic averaging enabled downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 10 smsc emc1046/emc1047 datasheet 2.3 smbus electrical characteristics standby supply current i stby 200 ua run / stop bit set. monitoring disabled. internal temperature monitor temperature accuracy 0.25 1 c 0c < t a < 100c 2 c -40c < t a < 125c temperature resolution 0.125 c external temperature monitor temperature accuracy 0.25 1 c +40c < t diode < +110c 0c < t a < 110c 0.5 2 c -40c < t diode < 127c temperature resolution 0.125 c conversion time all channels t conv 190 ms default settings capacitive filter c filter 2.2 2.7 nf connected across external diode resistance error correction r series 100 in series with dp and dn lines leakage current i leak 5 ua powered or unpowered t a < 85c power up timing first conversion ready t conv_f 300 ms time after power up before all channels updated with valid data smbus delay t smb_d 15 ms delay before smbus communications should be sent by host table 2.3 smbus elect rical specifications v dd = 3.0v to 3.6v, t a = -40c to 125c, all typical values are at t a = 27c unless otherwise noted. characteristic symbol min typ max units conditions smbus interface input high voltage v ih 2.0 v dd v 5v tolerant input low voltage v il -0.3 0.8 v 5v tolerant input high/low current i ih / i il 5 ua powered or unpowered t a < 85c hysteresis 420 mv table 2.2 electrical specifications (continued) v dd = 3.0v to 3.6v, t a = -40c to 125c, all typical values at t a = 27c unless otherwise noted. characteristic symbol min typ max units conditions downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 11 revision 0.69 (06-29-09) datasheet input capacitance c in 5p f output low sink current i ol 8.2 15 ma smdata = 0.4v smbus timing clock frequency f smb 10 400 khz spike suppression t sp 50 ns bus free time start to stop t buf 1.3 us hold time: start t hd:sta 0.6 us setup time: start t su:sta 0.6 us setup time: stop t su:stp 0.6 us data hold time t hd:dat 0.3 us data setup time t su:dat 100 ns clock low period t low 1.3 us clock high period t high 0.6 us clock/data fall time t fall 300 ns min = 20+0.1c load ns clock/data rise time t rise 300 ns min = 20+0.1c load ns f smb > 100khz clock/data rise time t rise 1000 ns min = 20+0.1c load ns f smb < 100khz capacitive load c load 400 pf per bus line table 2.3 smbus electrical specifications (continued) v dd = 3.0v to 3.6v, t a = -40c to 125c, all typical values are at t a = 27c unless otherwise noted. characteristic symbol min typ max units conditions downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 12 smsc emc1046/emc1047 datasheet chapter 3 system management bus interface protocol 3.1 system management bus interface protocol the emc1046/emc1047 communicate with a host controller, such as an smsc sio, through the smbus. the smbus is a two-wire serial communicat ion protocol between a computer host and its peripheral devices. a detailed timing diagram is shown in figure 3.1 . the emc1046/emc1047 are smbus 2.0 compatible and support send byte, read byte, write byte, and receive byte, as valid protocols as shown below. all of the below protocols use the convention in ta b l e 3 . 1 . attempting to communicate with the emc1046/em c1047 smbus interface with an invalid slave address or invalid protocol will result in no respons e from the device and will not affect its register contents. stretching of the smclk signal is suppo rted, provided other devi ces on the smbus control the timing. 3.2 write byte the write byte is used to write one byte of data to the registers as shown below table 3.2 : figure 3.1 smbus timing diagram table 3.1 protocol format data sent to device data sent to the host table 3.2 write byte protocol start slave address wr ack register address ack register data ack stop 1 -> 0 1001_100 0 0 xxh 0 xxh 0 0 -> 1 smdata smclk t low t rise t high t fall t buf t hd:sta p s s - start condition p - stop condition t hd:dat t su:dat t su:sta t hd:sta p t su:sto s downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 13 revision 0.69 (06-29-09) datasheet 3.3 read byte the read byte protocol is used to read one byte of data from the registers as shown in table 3.3 . 3.4 send byte the send byte protocol is used to set the internal address register pointer to the correct address location. no data is transferred during the send byte protocol as shown in ta b l e 3 . 4 . 3.5 receive byte the receive byte protocol is used to read data from a register when the internal register address pointer is known to be at the right location (e.g. set via send byte). this is used for consecutive reads of the same register as shown in ta b l e 3 . 5 . 3.6 smbus address the emc1046/emc1047-1 devices respond to the 7-bit slave address 1001_100xb. the emc1046-6 will respond to the 7-bit slave address 1001_101xb. the emc1047-2 will respond to the 7-bit slave address 1001_000xb. note: other addresses are available. contact smsc for more information. 3.7 smbus timeout the emc1046/emc1047 support smbus timeout. if the clock line is held low for longer than 30ms, the device will reset its smbus protocol. this functi on can be enabled by setting the timeout bit in the consecutive alert register (see section 5.9 ). table 3.3 read byte protocol start slave address wr ack register address ack start slave address rd ack register data nack stop 1-> 0 1001_100 0 0 xxh 0 0 -> 1 1001_100 1 0 xxh 1 0 -> 1 table 3.4 send byte protocol start slave address wr ack register address ack stop 1 -> 0 1001_100 0 0 xxh 0 1 -> 0 table 3.5 receive byte protocol start slave address rd ack register data nack stop 1 -> 0 1001_100 1 0 xxh 1 1 -> 0 downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 14 smsc emc1046/emc1047 datasheet chapter 4 product description the emc1046/emc1047 are smbus temperature sens ors. the emc1046/emc1047 monitor up to six (6) external diodes and one internal diode. thermal management is performed in cooperation with a host device. this consists of the host reading the temperature data of both the external and internal temperature diodes of the emc1046/emc1047 and using that data to control the speed of one or more fans. because the emc1046/emc1047 automatically corrects for temperature errors due to series resistance in temperature diode lines, there is greate r flexibility in where external diodes are positioned and better measurement accuracy than previously available devices without resistance error correction. as well, the automatic beta detection fe ature means that there is no need to program the device according to which type of diode is present. therefore, the device can power up ready to operate for any system configuration including those diodes that require the bjt or transistor model. figure 4.1 shows a system level block di agram of the emc1046/emc1047. . 4.1 modes of operation the emc1046/emc1047 have two modes of operation. ? active (run) - in this mode of operation, the adc is converting on all temperature channels at the programmed conversion rate. the temperature data is updated at the end of every conversion and the limits are checked. in active mode, writ ing to the one-shot register will do nothing. ? standby (stop) - in this mode of operation, the majority of circuitry is powered down to reduce supply current. the temperature data is not updated and the limits are not checked. in this mode of operation, the smbus is fully active and the pa rt will return requested data. writing to the one- shot register will enable the device to update a ll temperature channels. once all the channels are updated, the device will return to the standby mode. figure 4.1 system diagram for emc1046/emc1047 cpu emc1046/7 host smbus interface dp1 / dn6 (1047 only) dn1 / dp6 (1047 only) internal diode dp2 / dn3 dn2 / dp3 dp4 / dn5 dn4 / dp5 optional apd optional apd vdd smclk smdata downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 15 revision 0.69 (06-29-09) datasheet 4.2 temperature monitoring the emc1046/emc1047 can monitor the temperature of up to six (6) externally connected diodes as well as the internal or ambient temperature. each channel is configured with the following features enabled or disabled based on user settings and syst em requirements. application note: when measuring a 45nm cpu diode, the report ed temperature has an error of approximately +1.5c at 100c. this error is related to non-perfect ideality in the cpu diode. 4.2.1 resistance error correction the emc1046/emc1047 includes active resistance error correction to remove the effect of up to 100 ohms of series resistance. without this automatic feature, voltage developed across the parasitic resistance in the remote diode path causes the temp erature to read higher than the true temperature is. the error induced by parasitic resistance is approximately +0.7c per ohm. sources of series resistance include bulk resistance in the remote temperature transistor junctions, series resistance in the cpu, and resistance in the printed circui t board traces and package leads. resistance error correction in the emc1046/emc1047 eliminates the ne ed to characterize and compensate for parasitic resistance in the remote diode path. 4.2.2 beta compensation the forward current gain, or beta, of a transistor is not constant as emitter currents change. as well, it is not constant over changes in temperature. the variation in beta causes an error in temperature reading that is proportional to absolute temperat ure. compensating for this error is also known as implementing the bjt or transistor model for temperature measurement. for discrete transistors configured with the collect or and base shorted together, the beta is generally sufficiently high such that the percent change in beta variation is very small. for example, a 10% variation in beta for two forced emitter currents with a transistor whose ideal beta is 50 would contribute approximately 0.25c error at 100c. however for s ubstrate transistors where the base-emitter junction is used for temperature measurement and the collector is tied to the substrate, the proportional beta variation will cause large error. for example, a 10% variation in beta for two forced emitter currents with a transistor whose ideal beta is 0.5 would contribute approximately 8.25c error at 10 0c. the beta compensation circuitry in the emc1046/emc 1047 corrects for this beta variation to eliminate any error which would normally be induced. it automati cally detects the appropriate beta setting to use. 4.2.3 digital averaging to reduce the effect of noise and temperature spikes on the reported temperature, all of the external diode channels use digital averaging. this averaging acts as a running avera ge using the previous four measured values. the default setting is to have digital averaging disabled for all channels. it can be enabled for each channel individually by the filter control register (see section 5.18 ). 4.2.4 hottest of comparison at the end of every measuremen t cycle, the emc1046/emc1047 compares all of the user selectable external diode channels to determine which of thes e channels is reporting the hottest temperature. the hottest temperature is stored in the hottest temperature registers and the appropriate status bit in the hottest status register is set. as an optional feature, the emc1046/emc1047 can also flag an event if the hottest temperature channel changes. for example, suppose that external diode channels 1, 3, and 4 are programmed to be compared in the hottest of comparison. if the external diode 1 channel reports the hottest temperature of the three, its temperature is copied into the hottest temperature registers (in addition to the external diode 1 temperature registers) and it is flagged in the hottest status bit. if, on the next measurem ent, the external diode 3 channel temperature has increased such that it is now the hottest temper ature, the emc1046/emc1047 can flag this event. downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 16 smsc emc1046/emc1047 datasheet 4.2.5 conversion rates the emc1046/emc1047 may be configured for different conversion rates based on the system requirements. the conversion rate is configured as described in section 5.5 . the default conversion rate is 4 conversions per second. other available conversion rates are shown in ta b l e 5 . 7 . 4.2.6 dynamic averaging dynamic averaging causes the emc1046/emc1047 to measure the external diode channels for an extended time based on the selected conversion rate . this functionality can be disabled for increased power savings at the lower conversion rates (see section 5.5 ). when dynamic averaging is enabled, the device will automatically adjust the sampling and measurement time for the external diode channels. this allows the device to average 2x or 4x longer than the normal 11 bit operation (nominally 21ms per channel) while still maintaining the sele cted conversion rate. the benefits of dynamic averaging are improved noise rejection due to the longer integration time as well as less random variation of the temperature measurement. when enabled, the dynamic averaging also applies when a one-shot command is issued. the device will perform the desired averaging during the one-shot operation according to the selected conversion rate. when enabled, the dynamic averaging will affect the average supply current based on the chosen conversion rate as shown in ta b l e 4 . 1 for the emc1046/emc1047 . 4.3 diode connections the diode connection for the external diode 1 chan nel is determined bas ed on the selected device. for the emc1046, this channel can support a diod e-connected transistor (such as a 2n3904) or a substrate transistor (such as those found in an cpu or gpu) as shown in figure 4.2 . anti-parallel diodes are not supported on the external diode 1 channel. for the emc1047, all channels support anti-parallel di odes. if this function is enabled for a specific channel (see section 5.17 ), then both the normal and anti-paral lel diodes must use diode connected transistors. otherwise, they may use a diode co nnected transistor or a substrate transistor. table 4.1 supply current vs. conversion rate for emc1046/emc1047 conversion rate average supply current averaging factor (based on 11-bit operation) enabled (default) disabled enabled (default) disabled 1 / sec 605ua 395ua 4x 1x 2 / sec 635ua 465ua 2x 1x 4 / sec (default) 700ua 700ua 1x 1x continuous (see table 5.8 ) 825ua 825ua 0.5x 0.5x downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 17 revision 0.69 (06-29-09) datasheet 4.3.1 diode faults the emc1046/emc1047 actively detects an open and short condition on each measurement channel. when a diode fault is detected, the temperature data msbyte is forced to a value of 80h and the fault bit is set in the status register. when an external diode channel is configured to operate in apd mode, the circuitry will detect independent open fault conditions, however a short condition will be shared between the apd channels. figure 4.2 diode connections local ground to dp typical remote substrate transistor i.e. cpu substrate pnp typical remote discrete pnp transistor i.e. 2n3906 typical remote discrete npn transistor i.e. 2n3904 to dn to dp to dn to dp to dn downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 18 smsc emc1046/emc1047 datasheet chapter 5 register description the registers shown in ta b l e 5 . 1 are accessible through the smbus. an entry of - indicates that the bit is not used and will always read 0. table 5.1 register set in hexadecimal order register address r/w register name function default value page 00h r internal diode data high byte stores the integer data for the internal diode 00h page 22 01h r external diode 1 data high byte stores the integer data for the external diode 1 00h page 22 02h r-c status stores the status bits for the internal diode and external diodes 00h page 23 03h r/w configuration controls the general operation of the device (mirrored at address 09h) 00h page 24 04h r/w conversion rate controls the conversion rate for updating temperature data (mirrored at address 0ah) 06h (4/sec) page 24 05h r/w internal diode high limit stores the 8-bit high limit for the internal diode (mirrored at address 0bh) 55h (85c) page 25 06h r/w internal diode low limit stores the 8-bit low limit for the internal diode (mirrored at address 0ch) 00h (0c) page 25 07h r/w external diode 1 high limit high byte stores the integer portion of the high limit for the external diode 1 (mirrored at register 0dh) 55h (85c) page 25 08h r/w external diode 1 low limit high byte stores the integer portion of the low limit for the external diode 1 (mirrored at register 0eh) 00h (0c) page 25 09h r/w configuration controls the general operation of the device (mirrored at address 03h) 00h page 24 0ah r/w conversion rate controls the conversion rate for updating temperature data (mirrored at address 04h) 06h (4/sec) page 24 0bh r/w internal diode high limit stores the 8-bit high limit for the internal diode (mirrored at address 05h) 55h (85c) page 25 0ch r/w internal diode low limit stores the 8-bit low limit for the internal diode (mirrored at address 06h) 00h (0c) page 25 0dh r/w external diode1 high limit high byte stores the integer portion of the high limit for the external diode 1 (mirrored at register 07h) 55h (85c) page 25 downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 19 revision 0.69 (06-29-09) datasheet 0eh r/w external diode1 low limit high byte stores the integer portion of the low limit for the external diode 1 (mirrored at register 08h) 00h (0c) page 25 0fh w one shot a write to this register initiates a one shot update. 00h page 27 10h r external diode 1 data low byte stores the fractional data for the external diode 1 00h page 22 13h r/w external diode 1 high limit low byte stores the fractional portion of the high limit for the external diode 1 00h page 25 14h r/w external diode 1 low limit low byte stores the fractional portion of the low limit for the external diode 1 00h page 25 15h r/w external diode 2 high limit high byte stores the integer portion of the high limit for external diode 2 55h (85c) page 25 16h r/w external diode 2 low limit high byte stores the integer portion of the low limit for external diode 2 00h (0c) page 25 17h r/w external diode 2 high limit low byte stores the fractional portion of the high limit external diode 2 00h page 25 18h r/w external diode 2 low limit low byte stores the fractional portion of the low limit for external diode 2 00h page 25 1bh r-c external diode fault stores status bits indicating which external diode detected a diode fault 00h page 28 22h r/w consecutive alert controls the number of out-of-limit conditions that must occur before the status bit is asserted 70h page 28 23h r external diode 2 data high byte stores the integer data for external diode 2 00h page 22 24h r external diode 2 data low byte stores the fractional data for external diode 2 00h page 22 25h r/w external diode 1 beta configuration stores the beta compensation circuitry settings for external diode 1 08h page 29 26h r/w external diode 2 beta configuration stores the beta compensation circuitry settings for external diode 2 08h page 29 29h r internal diode data low byte stores the fractional data for the internal diode 00h page 22 2ah r external diode 3 high byte stores the integer data for external diode 3 00h page 22 2bh r external diode 3 low byte stores the fractional data for external diode 3 00h page 22 2ch r/w external diode 3 high limit high byte stores the integer portion of the high limit for external diode 3 55h (85c) page 25 table 5.1 register set in hexadecimal order (continued) register address r/w register name function default value page downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 20 smsc emc1046/emc1047 datasheet 2dh r/w external diode 3 low limit high byte stores the integer portion of the low limit for external diode 3 00h (0c) page 25 2eh r/w external diode 3 high limit low byte stores the fractional portion of the high limit for external diode 3 00h page 25 2fh r/w external diode 3 low limit low byte stores the fractional portion of the low limit for external diode 3 00h page 25 32h r hottest diode high byte stores the integer data for the hottest temperature 00h page 30 33h r hottest diode low byte stores the fractional data for the hottest temperature 00h page 30 34h r-c hottest status status bits indicating which external diode is hottest 00h page 31 35h r-c high limit status status bits for the high limits 00h page 31 36h r-c low limit status status bits for the low limits 00h page 32 39h r/w rec configuration controls rec for all channels 00h page 32 3ah r/w hottest config controls which external diode channels are used in the hottest of comparison 00h page 33 3bh r/w channel config controls which channels are enabled 00h page 33 40h r/w filter control controls t he digital filter setting for the external diode 1 channel 00h page 34 41h r external diode 4 data high byte stores the integer data for the external diode 4 channel 00h page 22 42h r external diode 4 data low byte stores the fractional data for the external diode 4 channel 00h page 22 43h r external diode 5 data high byte stores the integer data for the external diode 5 channel 00h page 22 44h r external diode 5 data low byte stores the fractional data for the external diode 5 channel 00h page 22 45h r external diode 6 data high byte stores the integer data for the external diode 6 channel 00h page 22 46h r external diode 6 data low byte stores the fractional data for the external diode 6 channel 00h page 22 50h r/w external diode 4 high limit high byte stores the integer data for the high limit for the external diode 4 channel 55h (85c) page 25 51h r/w external diode 4 low limit high byte stores the integer data for the low limit for the external diode 4 channel 00h (0c) page 25 table 5.1 register set in hexadecimal order (continued) register address r/w register name function default value page downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 21 revision 0.69 (06-29-09) datasheet 52h r/w external diode 4 high limit low byte stores the fractional data for the low limit for the external diode 4 channel 00h page 25 53h r/w external diode 4 low limit low byte stores the fractional data for the low limit for the external diode 4 channel 00h page 25 54h r/w external diode 5 high limit high byte stores the integer data for the high limit for the external diode 5 channel 55h (85c) page 25 55h r/w external diode 5 low limit high byte stores the integer data for the low limit for the external diode 5 channel 00h (0c) page 25 56h r/w external diode 5 high limit low byte stores the fractional data for the low limit for the external diode 5 channel 00h page 25 57h r/w external diode 5 low limit low byte stores the fractional data for the low limit for the external diode 5 channel 00h page 25 58h r/w external diode 6 high limit high byte stores the integer data for the high limit for the external diode 6 channel 55h (85c) page 25 59h r/w external diode 6 low limit high byte stores the integer data for the low limit for the external diode 6 channel 00h (0c) page 25 5ah r/w external diode 6 high limit low byte stores the fractional data for the low limit for the external diode 6 channel 00h (0c) page 25 5bh r/w external diode 6 low limit low byte stores the fractional data for the low limit for the external diode 6 channel 00h (0c) page 25 71h r/w external diode 4 beta configuration stores the beta compensation circuitry settings for external diode 4 08h page 29 fdh r product id - emc1046 stores a fixed value that identifies each product 1ah page 34 fdh r product id - emc1047 stores a fixed value that identifies each product 1ch page 34 feh r manufacturer id stores a fixed value that represents smsc 5dh page 35 ffh r revision stores a fixed value that represents the revision number 01h page 35 table 5.1 register set in hexadecimal order (continued) register address r/w register name function default value page downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 22 smsc emc1046/emc1047 datasheet 5.1 data read interlock when any temperature channel high byte register is read, the corresponding low byte is copied into an internal shadow register. the user is free to r ead the low byte at any time and be guaranteed that it will correspond to the previously read high byte. regardless if the low byte is read or not, reading from the same high byte register again will auto matically refresh this stored low byte data. 5.2 temperature data registers all temperatures are stored as an 11-bit value with the high by te representing the integer value and the low byte representing the fractional value left justified to occupy the msbits. the data format is standard 2s complement from -64c to 127.875c as shown in table 5.3 . table 5.2 temperature data registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 00h r internal diode high byte sign 64 32 16 8 4 2 1 00h 29h r internal diode low byte 0.5 0.25 0.125 - - - - - 00h 01h r external diode1 high byte sign 64 32 16 8 4 2 1 00h 10h r external diode 1 low byte 0.5 0.25 0.125 - - - - - 00h 23h r external diode 2 high byte sign 64 32 16 8 4 2 1 00h 24h r external diode 2 low byte 0.5 0.25 0.125 - - - - - 00h 2ah r external diode 3 high byte sign 64 32 16 8 4 2 1 00h 2bh r external diode 3 low byte 0.5 0.25 0.125 - - - - - 00h 41h r external diode 4 high byte sign 64 32 16 8 4 2 1 00h 42h r external diode 4 low byte 0.5 0.25 0.125 - - - - - 00h 43h r external diode 5 high byte sign 64 32 16 8 4 2 1 00h 44h r external diode 5 low byte 0.5 0.25 0.125 - - - - - 00h 45h r external diode 6 high byte sign 64 32 16 8 4 2 1 00h 46h r external diode 6 low byte 0.5 0.25 0.125 - - - - - 00h downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 23 revision 0.69 (06-29-09) datasheet 5.3 status register the status register reports general error condit ions. to identify specific channels, refer to section 5.8 , section 5.13 , and section 5.14 . the individual status register bi ts (except hottest) are cleared when the appropriate high limit or low limit register has been read or cleared. bit 7 - busy - this bit indicates that the adc is currently converting. bit 6 - hottest - this bit is set if the rem_hot bit (see section 5.17 ) is set and the hottest channel changes. this bit is cleared when the register is read. bit 4 - high - this bit is set when any of the temperature channels meets or exceeds its p rogrammed high limit. see the high limit status re gister for specific channel information ( section 5.13 ). bit 3 - low - this bit is set when any of the temperature channels drops below its programmed low limit. see the low limit status register for specific channel information ( section 5.14 ). bit 2 - fault - this bit is asserted when a diode fault is detected on any of the external diode channels. see the external diode fault regi ster for specific channel information ( section 5.8 ). table 5.3 temperature data format temperature (c) binary hex (as read by registers) diode fault 1000_0000_000b 80_00h -64 1100_0000_000b c0_00h -63.875 1100_0000_001b c0_20h -1 1111_1111_000b ff_00h -0.125 1111_1111_111b ff_e0h 0 0000_0000_000b 00_00h 0.125 0000_0000_001b 00_20h 1 0000_0001_000b 01_00h 63 0011_1111_000b 3f_00h 64 0100_0000_000b 40_00h 127 0111_1111_000b 7f_00h 127.875 0111_1111_111b 7f_e0h table 5.4 status register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 02h r status busy hot test -h i g hl o wf a u l t - - 0 0 h downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 24 smsc emc1046/emc1047 datasheet 5.4 configuration register the configuration register controls the basic operati on of the device. this register is fully accessible at either address. bit 6 - run / stop - controls active/standby modes. ? 0 (default) - the device is in acti ve mode and converting on all channels. ? 1 -the device is in standby mode and not converting. bit 1 - davg_dis - disables the dynamic averaging feature on all temperature channels (see section 4.2.6 ). ? 0 (default) - the dynamic averaging feature is enabled. all temperature c hannels will be converted with an averaging factor that is based on the conversion rate as shown in ta b l e 4 . 1 . ? 1 - the dynamic averaging featur e is disabled. all temperature channels will be converted with a maximum averaging factor of 1x (e quivalent to 11-bit conversion). for higher conversion rates (i.e. more conversions per second), this aver aging factor will be reduced as shown in ta b l e 4 . 1 . 5.5 conversion rate register the conversion rate register controls how ofte n the temperature measurement channels are updated and compared against the limits. this register is fully accessible at either address. bits 3-0 - conv[3:0] - determines the conversion rate as shown in ta b l e 5 . 7 . table 5.5 configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 03h r/w config - run / stop - - -d a v g _ dis - 00h 09h table 5.6 conversion rate register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 04h r/w conversion rate - - - - conv[2:0] 06h (4/sec) 0ah table 5.7 conversion rate conv[2:0] conversions / second 210 100 1 101 2 1 1 0 4 (default) downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 25 revision 0.69 (06-29-09) datasheet the actual conversion rate for continuous conver sions will depend on the number of diode channels enabled and is shown in table 5.8 . 5.6 limit registers 1 1 1 continuous all others 4 table 5.8 maximum conversion rate per temperature channels number of external diode channels max conversion rate 3 13 / sec 4 12 / sec 5 11 / sec 6 (emc1047only) 10 / sec table 5.9 temperature limit registers addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 05h r/w internal diode high limit sign 64 32 16 8 4 2 1 55h (85c) 0bh 06h r/w internal diode low limit sign 64 32 16 8 4 2 1 00h (0c) 0ch 07h r/w external diode1 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 0dh 13h r/w external diode 1 high limit low byte 0.5 0.25 0.125 - - - - - 00h 08h r/w external diode 1 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 0eh 14h r/w external diode1 low limit low byte 0.5 0.25 0.125 - - - - - 00h table 5.7 conversion rate (continued) conv[2:0] conversions / second 210 downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 26 smsc emc1046/emc1047 datasheet 15h r/w external diode 2 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 16h r/w external diode 2 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 17h r/w external diode 2 high limit low byte 0.5 0.25 0.125 - - - - - 00h 18h r/w external diode 2 low limit low byte 0.5 0.25 0.125 - - - - - 00h 2ch r/w external diode 3 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 2dh r/w external diode 3 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 2eh r/w external diode 3 high limit low byte 0.5 0.25 0.125 - - - - - 00h 2fh r/w external diode 3 low limit low byte 0.5 0.25 0.125 - - - - - 00h 50h r/w external diode 4 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 51h r/w external diode 4 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 52h r/w external diode 4 high limit low byte 0.5 0.25 0.125 - - - - - 00h 53h r/w external diode 4 low limit low byte 0.5 0.25 0.125 - - - - - 00h table 5.9 temperature limit registers (continued) addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 27 revision 0.69 (06-29-09) datasheet the device contains both high and low limits for al l temperature channels. if the measured temperature meets or exceeds the high limit, then the correspo nding status bit is set. likewise, if the measured temperature is less than the low limit, the corresponding status bit is set. the limit registers with multiple addresses are fully accessible at either address. when the device is in standby mode, updating the limit registers will have no affect until the next conversion cycle occurs. this can be initiated via a write to the one shot register or by clearing the run / stop bit in the configuration register (see section 5.4 ). 5.7 one shot register 54h r/w external diode 5 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 55h r/w external diode 5 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 56h r/w external diode 5 high limit low byte 0.5 0.25 0.125 - - - - - 00h 57h r/w external diode 5 low limit low byte 0.5 0.25 0.125 - - - - - 00h 58h r/w external diode 6 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 59h r/w external diode 6 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 5ah r/w external diode 6 high limit low byte 0.5 0.25 0.125 - - - - - 00h 5bh r/w external diode 6 low limit low byte 0.5 0.25 0.125 - - - - - 00h table 5.10 one shot register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 0fh w one shot writing to this register initiates a single conversion cycle. data is not stored and always reads 00h 00h table 5.9 temperature limit registers (continued) addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 28 smsc emc1046/emc1047 datasheet the one shot register is used to initiate a one shot command. writing to the one shot register, when the device is in standby mode and busy bit (in status register) is 0, will immediately cause the adc to update all temperature me asurements. writing to the one shot register while the device is in active mode will have no affect. 5.8 external diode fault register the external diode fault register indicates which of the external diodes caused the fault bit in the status register to be set. these bits are cleared when read if the error condition has been removed. bit 6 - e6flt - this bit is set if the external diode 6 channel reported a diode fault. bit 5 - e5flt - this bit is set if the external diode 5 channel reported a diode fault. bit 4 - e4flt - this bit is set if the external diode 4 channel reported a diode fault. bit 3 - e3flt - this bit is set if the external diode 3 channel reported a diode fault. bit 2 - e2flt - this bit is set if the external diode 2 channel reported a diode fault. bit 1 - e1flt - this bit is set if the external diode 1 channel reported a diode fault. 5.9 consecutive alert register the consecutive alert register determines how many times an out-of-limit error or diode fault must be detected in consecutive meas urements before the interrupt status registers are asserted. each out of limit error and diode fault condition has its own counter associated with it. each counter is incremented whenever the corresponding channe l exceeds the appropriate limit. additionally, each counter is reset if the condition has been removed. (i.e. if external diode 1 exceeds its high limit, it will increment the high counter. if, on the next measurement, it experiences a diode fault, the high limit counter will be reset and the diode fault counter will be incremented). when the consecutive alert counter reaches its programmed value then the status bit(s) for that channel and the error condition will be set to 1. measurements will continue normally. for example, if the calr t[2:0] bits are set for 4 consecutiv e alerts on an emc1046/emc1047 device, the high limits are set at 70c, and none of the channels are masked, then the status bits will be asserted after the following four measurements: 1. internal diode reads 71c and both external dio des read 69c. consecutive alert counter for int is incremented to 1. table 5.11 external diode fault register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 1bh r-c external diode fault - e6flt e5flt e4flt e3flt e2flt e1flt - 00h table 5.12 consecutive alert register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 22h r/w consecutive alert time out ---c a l rt2 cal rt1 cal rt0 - 70h downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 29 revision 0.69 (06-29-09) datasheet 2. both the internal diode and the external diode 1 read 71c and external diode 2 reads 68c. consecutive alert counter for int is incremented to 2 and for ext1 is set to 1. 3. the external diode 1 reads 71c and both the internal diode and external diode 2 read 69c. consecutive alert counter for int and ext2 are cleared and ext1 is incremented to 2. 4. the internal diode reads 71c and both external diodes read 71c. consecutive alert counter for int is set to 1, ext2 is set to 1, and ext1 is incremented to 3. 5. the internal diode reads 71c and both the exte rnal diodes read 71c. consecutive alert counter for int is incremented to 2, ext2 is set to 2, and ext1 is incremented to 4. the high status bit are set for ext1. the ext1 counter is reset to 0 an d all other counters hold the last value until the next temperature measurement. bit 7 - timeout - determines whether the smbus timeout function is enabled. ? 0 (default) - the smbus timeout feature is disabled. the smclk line can be held low indefinitely without the device resetting its smbus protocol. ? 1 - the smbus timeout feature is enabled. if the smclk line is held low for more than 30ms, then the device will reset the smbus protocol. bits 3-1 - calrt[2:0] - determine the number of c onsecutive measurements that must have an out of limit condition or diode fault before the status bi ts is asserted. all temperature channels use this value to set the respecti ve counters. the bits are decoded as shown in table 5.13 . the default setting is 1 consecutive out of limit conversion. application note: if one of the fault queues is not cleared and the calrt[2:0] bits are updated, the update wont take affect until fault queue is cleared. all the fault queues are independent so those that are empty will be updated immediately. 5.10 beta configuration register table 5.13 consecutive alert settings 210 number of consecutive out of limit measurements 0 0 0 1 (default for calrt[2:0]) 001 2 011 3 111 4 all others 1 (calrt[2:0]), table 5.14 beta configuration register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 25h r/w external diode 1 beta configuration - - - - auto1 beta1[2:0] 08h 26h r/w external diode 2 beta configuration - - - - auto2 beta2[2:0] 08h 71h r/w external diode 4 beta configuration - - - - auto4 beta4[2:0] 08h downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 30 smsc emc1046/emc1047 datasheet these registers are used to set t he beta compensation factor that is used for the external diode channels. bit 3 - autox - enables the beta compen sation factor autodetection function. ? 0 - the beta compensation factor autodetection circuitry is disabled. the external diode will always use the beta compensation factor set by the betax[2:0] bits. ? 1 (default) - the beta compensat ion factor autodetection circuitr y is enabled. at the beginning of every conversion, the optimal beta compensatio n factor setting will be determined and applied. the betax[2:0] bits will be automatically updated to indicate the current setting. bit 2-0 - betax[2:0] - these bits always reflect the current beta configuration settings. if autodetection circuitry is enabled, then these bits will be updated aut omatically and writing to these bits will have no effect. if the autodetection circuitry is disabled, then these bits will determine the beta configuration setting that is used for their respective channels. care should be taken when setting the betax[2:0] bits when the autodetection circuitry is disabled. if the beta compensation factor is set at a beta valu e that is higher than the transistor beta, then the circuit may introduce measurement errors. when measuring a discrete thermal diode (such as 2n3904) or a cpu diode that functions like a di screte thermal diode (suc h as an amd processor diode), then the betax[2:0] bits should be set to 111b. 5.11 hottest temperature registers table 5.15 beta compensation look up table betax[2:0] minimum beta 210 000 < 0.08 001 < 0.111 010 < 0.176 011 < 0.29 100 < 0.48 101 < 0.9 110 < 2.33 1 1 1 disabled table 5.16 hottest temperature registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 32h r hottest temperature high byte sign 64 32 16 8 4 2 1 80h 33h r hottest temperature low byte 0.5 0.25 0.125 - - - - - 00h downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 31 revision 0.69 (06-29-09) datasheet the hottest temperature registers store the measur ed hottest temperature of all the selected external diode channels (see section 5.16 ). if no external diodes are selected then the high byte register will read 80h. the data format is the sa me as the temperature channels. 5.12 hottest temperature status register the hottest temperature status register flags which external diode temperature is hottest. if multiple temperature channels measure the same temperature and are equal to the hottest te mperature, then hottest status will be based on the measurement order. bit 6 - ext6 - the external diode 6 channel is the hottest. bit 4 - ext5 - the external diode 5 channel is the hottest. bit 3 - ext4 - the external diode 4 channel is the hottest. bit 3 - ext3 - the external diode 3 channel is the hottest. bit 2 - ext2 - the external diode 2 channel is the hottest. bit 1 - ext1 - the external diode 1 channel is the hottest. bit 0 - int - the internal diode channel is the hottest. 5.13 high limit status register the high limit status register contains the status bits that are set when a temperature channel high limit is exceeded for a number of consecutive r eadings as set by the consecutive alert counts (see section 5.9 ). if any of these bits are set, then the high status bit in the status register is set. reading from the high limit status register will clear all bi ts if the error condition has been removed. reading from the register will also clear the high status bit in the status register. bit 6 - e6high - this bit is set when the external diode 6 channel meets or exceeds its programmed high limit. bit 5 - e5high - this bit is set when the external diode 5 channel meets or exceeds its programmed high limit. bit 4 - e4high - this bit is set when the external diode 4 channel meets or exceeds its programmed high limit. bit 3 - e3high - this bit is set when the external diode 3 channel meets or exceeds its programmed high limit. table 5.17 hottest temperature register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 34h r hottest temperature status - ext6 ext5 ext4 ext3 ext2 ext1 int 00h table 5.18 high limit status register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 35h r-c high limit status -e 6 high e5 high e4 high e3 high e2 high e1 high i high 00h downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 32 smsc emc1046/emc1047 datasheet bit 2 - e2high - this bit is set when the external diode 2 channel meets or exceeds its programmed high limit. bit 1 - e1high - this bit is set when the external diode 1 channel meets or exceeds its programmed high limit. bit 0 - ihigh - this bit is set when the internal diode channel meets or exceeds its programmed high limit. 5.14 low limit status register the low limit status register contains the status bits that are set when a temperature channel drops below the low limit for a number of consecutive read ings as set by the consecutive alert counts (see section 5.9 ). if any of these bits are set, then the low st atus bit in the status register is set. reading from the low limit status register will clear all bi ts if the error condition has been removed. reading from the register will also clear the low status bit in the status register. bit 6 - e6low - this bit is set when the external diode 6 channel drops below its programmed low limit. bit 5- e5low - this bit is set when the external diode 5 channel drops below its programmed low limit. bit 4 - e4low - this bit is set when the external diode 4 channel drops below its programmed low limit. bit 3 - e3low - this bit is set when the external diode 3 channel drops below its programmed low limit. bit 2 - e2low - this bit is set when the external diode 2 channel drops below its programmed low limit. bit 1 - e1low - this bit is set when the external diode 1 channel drops below its programmed low limit. bit 0 - ilow - this bit is set when the internal diode channel drops below its programmed low limit. 5.15 rec configuration register the rec control register controls the resistance error correction circuitry for each of the external diode channels. bits 6 - 0 - ex_rec_n (emc1047 only) - disables the resistance error correction (rec) for the external diode x channel. note that e6_rec_n can only be written for the emc1047 only table 5.19 low limit status register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 36h r-c low limit status -e 6 low e5 low e4 low e3 low e2 low e1 low ilow 00h table 5.20 rec configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 39h r/w rec config - e6_ rec_n e5_ rec_n e4_ rec_n e3_ rec_n e2_ rec_n e1_ rec_n -0 0 h downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 33 revision 0.69 (06-29-09) datasheet ? 0 (default) - rec is enabled. ? 1 - rec is disabled. 5.16 hottest configuration register the hottest configuration register determines wh ich external diode channels (if any) are compared during the hottest of comparison that is automa tically performed at the end of every conversion cycle. bits 6 - 0 - exhot - controls whether the external diode x temperature data is compared during the hottest of comparison. ? 0 (default) - the external diode x channel is not compared during the hottest of comparison. ? 1 - the external diode x channel temperature da ta is compared to all other indicated channels during the hottest of comparison. bit 0 - ihot - controls whether the internal diode temperature da ta is compared during the hottest of comparison. ? 0 (default) - the internal diode channel is not compared during the hottest of comparison. ? 1 - the internal diode channel temperature data is compared to all other indicated channels during the hottest of comparison. 5.17 channel configuration register the channel configuration register determines which external diode channels are active in the device. bit 7 - rem_hot - enables circuitry that will re member the last temper ature channel that was determined to be the hottest and flag an erro r if the hottest temperature channel changes. ? 0 (default) - the hottest status bit will not be asserted if the hottest temperature channel changes. ? 1 - if the hottest temperature channel changes, then the hottest status bit will be asserted. bit 2 - ext4_apd - enables the dp4 / dn5 and dn4 / dp5 pins to support two anti-parallel diode connections versus a single diode connection. ? 0 (default) - the dp4 / dn5 and dn4 / dp5 pins do not support two anti-parallel diode connections. the pins will only monitor a single external diode (external diode 4). ? 1 - the dp4 / dn5 and dn4 / dp5 pins support two anti-parallel diode connections (external diode 4 and external diode 5). table 5.21 hottest configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 3ah r/w hottest config - e6hot e5hot e4hot e3hot e2hot e1hot ihot 00h table 5.22 channel configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 3bh r/w channel config rem_ hot - - - - ext4_ apd ext2_ apd ext1_ apd 00h downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 34 smsc emc1046/emc1047 datasheet bit 1 - ext2_apd- enables the dp2 / dn3 and dn2 / dp3 pins to support two anti-parallel diode connections versus a single diode connection. ? 0 (default) - the dp2 / dn3 and dn2 / dp3 pins do not support two anti-parallel diode connections. the pins will only monitor a single external diode (external diode 2). ? 1 - the dp2 / dn3 and dn2 / dp3 pins support two anti-parallel diode connections (external diode 2 and external diode 3). bit 0 - ext1_apd (emc1047 only)- enables the dp1 / dn6 and dn1 / dp6 pins to support two anti- parallel diode connections versus a single diode connection. ? 0 (default) - the dp1 / dn6 and dn1 / dp6 pins do not support two anti-parallel diode connections. the pins will only monitor a single external diode (external diode 1). ? 1 - the dp1 / dn6 and dn1 / dp6 pins support two anti-parallel diode connections (external diode 1 and external diode 6. 5.18 filter control register the filter configuration register controls the digital filter on the external diode channels. bits 6 - 0 - avgx_en- control the digital averaging th at is applied to the external diode x temperature measurements. ? 0 (default) - digital averaging is disabled. ? 1 - digital averaging is enabled as a 4x running average for the external diode x channel. 5.19 product id register the product id register holds a unique value that identifies the device. table 5.23 filter control register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 40h r/w filter control - avg6_ en avg5_ en avg4_ en avg3_ en avg2_ en avg1_ en - 00h table 5.24 product id register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default fdh r product id 0 0 0 1 1 0 1 0 1ah emc1046 000111 0 0 1 c h emc1047 downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 35 revision 0.69 (06-29-09) datasheet 5.20 manufacturer id register (feh) the manufacturer id register holds an 8-bit word that identifies smsc. 5.21 revision register (ffh) the revision register contains an 8 bit word that identifies the die revision. table 5.25 manufacturer id register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default feh r manufacturer id 01011101 5 d h table 5.26 revision register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default f f h r r e v i s i o n00000001 0 1 h downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet revision 0.69 (06-29-09) 36 smsc emc1046/emc1047 datasheet chapter 6 package information 6.1 emc1046/emc1047 package drawing 6.2 package markings 6.2.1 emc1046-x-aizl (10-pin tssop) all devices will be marked on the first line of the t op side with 1046 or 1047. on the second line, they will be marked with the appropriate -x numb er (-1, -2, etc), the func tional revision b and country code (cc) . figure 6.1 10-pin tssop package drawing a a2 a1 seating plane side view ccc c gauge plane h 3-d view top view c 3 2 end view 4 3 5 detail "a" n ot es: 1. all dimensions are in millimeter. 2. tolerance on the true position of each lead is 0.04 mm at ma ximum material condition. 3. package body dimensions "d" and "e1" do not include mold/interle ad protrusions or flash. maximum mold protrusions or flash is 0.15 mm (0. 006 inches) per end and side. dimensions "d" and "e1" are determined at the outermost e xtremes of the plastic body, including any mismatch between top and bottom p lastic body. they are determined at datum plane "h". 4. dimensions "b" and "c" apply to the flat section of the lead be tween 0.08 mm and 0.15 mm from the lead tip. 5. details of the pin 1 identifier are optional, but must be located within the zone indicated. a initial release 3/29/05 s.k.iliev c see detail "a" e d e1 e pin 1 identifier area (d/2 x e1/2) 10x b l (0.95) 0.25 0 - 8 dim and tol per asm e y14.5m - 1994 finish material decimal x.x x.xx x.xxx 80 arkay drive hauppauge, ny 11788 usa angular print w ith "scale to fit" do not scale drawing c hecked appr oved name drawn d wg number scale title date std compliance unless otherwise specified dimensions are in millimeters and tolerances are: third angle projection rev sheet revision description revision history released by date package outline 10 pin tssop, 3x3 mm body, 0.50 mm pitch 1 - - 0.1 0.05 0.025 s.k.iliev s.k.iliev s.k.iliev 3/29/05 3/29/05 1:1 3/29/05 mo-10-tssop-3x3 jedec: mo-187 1 of 1 a c seating plane 4 downloaded from: http:///
1c multiple temperature sensor with beta compensation and hottest of thermal zones datasheet smsc emc1046/emc1047 37 revision 0.69 (06-29-09) datasheet chapter 7 revision history table 7.1 customer revision history revision level and date section/figure/entry correction rev. 0.69 (06-29-09) table 1.1, "emc1046/emc1047 pin description" added requires external pullup resistor to smdata and smclk in function column table 1.1, "emc1046/emc1047 pin description" added the following application note below table: for the 5v tolerant pins that have a pull-up resistor, the voltage difference between vdd and the pull- up voltage must never exceed 3.6v. table 2.1, "absolute maximum ratings" updated voltage limits for 5v tolerant pins with pull-up resistors. added the following note below table: for the 5v tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed 3.6v when the device is unpowered. downloaded from: http:///

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