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smsc emc1072 datasheet revision 1.39 (10-11-10) datasheet product features emc1072 1c temperature sensor with selectable address general description the emc1072 is a high accuracy, low cost, system management bus (smbus) temperature sensor with pin selectable smbus address. the device provides 1 a ccuracy (max) for external diode temperatures and 2c accuracy (max) for the internal diode temperature. the emc1072 monitors two temperature channels (one external and one internal). applications ? notebook computers ? desktop computers ? industrial ? embedded applications features ? pin compatible with adm1032, max6649, and lm99 ? external temperature monitors 0.25c typ accuracy (20c < t diode < 110c) 0.125c resolution supports 2n3904 and amd diodes ? internal temperature monitor 0.25c typ accuracy (-5c < t a < 100c) ? 3.3v supply voltage ? smbus 2.0 compliant programmable smbus address ? programmable temperature limits for alert and therm ? available in small 8-pin msop lead-free rohs compliant package block diagram internal temp diode switching current analog mux internal temperature register digital mux digital mux limit comparator low limit registers high limit registers conversion rate register interupt masking status registers configuration register smbus interface alert therm/addr smclk smdata dp dn vdd gnd emc1072 external temperature register(s) ? adc therm limit register therm hysteresis register smbus address decode downloaded from: http:///
order number(s): EMC1072-1-ACZL-TR for 8-pin, msop lead-free rohs compliant package emc1072-a-aczl-tr for 8-pin, msop lead-free rohs compliant package note: see table 1.1, "part selection" for smbus addressing options. reel size is 4,000 pieces this product meets the halogen maximum concentration values per iec61249-2-21 for rohs compliance and environmen tal information, please visit www.smsc.com/rohs 1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 2 smsc emc1072 datasheet 80 arkay drive, hauppauge, ny 11788 (631) 435-6000, fax (631) 273-3123 copyright ? 2010 smsc or its subsidiaries. all rights reserved. circuit diagrams and other information relating to smsc produc ts 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 b e accurate, no re sponsibility is assumed for inaccuracies. smsc reserves the right to make changes to specifications and produc t 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 inform ation 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 expr essly 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 applicati on 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 furthe r 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 obtai ned by visiting smscs website at h ttp://www.smsc.com. smsc is a registered trademark of standard microsystems corporat ion (smsc). product names and company na mes are the trademarks of their respective holders. smsc disclaims and excludes any and all warrant ies, including without limi tation any and all implied warranties of merchantabil ity, fitness for a particular purpose, title, a nd 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 liable 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 wa rranty; or otherwise; whether or not any remedy of buyer is h eld 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 temperature sensor with selectable address datasheet smsc emc1072 3 revision 1.39 (10-11-10) datasheet table of contents chapter 1 part selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 chapter 2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 chapter 3 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 smbus electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 chapter 4 system management bus interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 system management bus interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 write byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.3 read byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.4 send byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.5 receive byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.6 alert response address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.7 smbus address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.8 smbus timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 chapter 5 product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.1 modes of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.1.1 conversion rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.1.2 dynamic averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.2 therm output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.2.1 therm pin considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.3 alert output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.3.1 alert pin interrupt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.3.2 alert pin comparator mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.4 programmable external diode ideality factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.5 diode faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.6 consecutive alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.7 digital filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.8 temperature monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.9 temperature measurement results and data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.10 external diode connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 chapter 6 register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6.1 data read interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6.2 temperature data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6.3 status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6.4 configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6.5 conversion rate register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 6.6 limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.7 scratchpad registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.8 one shot register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6.9 therm limit registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6.10 channel mask register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6.11 consecutive alert register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.12 external diode ideality factor registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6.13 filter control register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 6.14 product id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 4 smsc emc1072 datasheet 6.15 smsc id register (feh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 6.16 revision register (ffh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 chapter 7 typical operating curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 chapter 8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 8.1 package markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 chapter 9 datasheet revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 5 revision 1.39 (10-11-10) datasheet list of figures figure 2.1 emc1072 pin diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 4.1 smbus timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 5.1 system diagram for emc1072 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 5.2 isolating therm pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 5.3 temperature filter step response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 5.4 temperature filter impulse response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 5.5 diode configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 8.1 8-pin msop / tssop package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 figure 8.2 emc1072 package markings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 6 smsc emc1072 datasheet list of tables table 1.1 part selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 2.1 emc1072 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 3.2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 3.3 smbus electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 4.1 protocol format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 4.2 write byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 4.3 read byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 4.4 send byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 4.5 receive byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 4.6 alert response address protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 4.7 smbus address decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 5.1 supply current vs. conversion rate for emc1072 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 5.2 emc1072 temperature data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 6.1 register set in hexadecimal order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 table 6.2 temperature data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 6.3 status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 6.4 configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 6.5 conversion rate register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 table 6.6 conversion rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 table 6.7 temperature limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 table 6.8 scratchpad register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 table 6.9 one shot register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 table 6.10 therm limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 table 6.11 channel mask register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 table 6.12 consecutive alert register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 table 6.13 consecutive alert / therm settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 table 6.14 ideality configuration registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 table 6.15 ideality factor look-up table (diode model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 table 6.16 filter configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 6.17 filter settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 6.18 product id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 table 6.19 manufacturer id register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 table 6.20 revision register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 table 9.1 customer revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 7 revision 1.39 (10-11-10) datasheet chapter 1 part selection the emc1072 device configuration is highlighted below. table 1.1 part selection part number smbus address functionality product id external diodes diode 1 default configuration diode 2 default configuration other emc1072 - 1 1001_100xb 1 amd or 3904 n/a software program- mable and mask- able high limits software program- mable therm limits 20h emc1072 - a see table 4.7 downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 8 smsc emc1072 datasheet chapter 2 pin description the pin types are described below. all pi ns labelled with (5v) are 5v tolerant. application note: for the 5v tolerant pins that have a pull-up resistor (smclk, smdata, therm , and alert ), the voltage difference between vdd and the pull-up voltage must never exceed 3.6v. power - these pins are used to supply either vdd or gnd to the device. aio - analog input / output. di - digital input. od - open drain digital output. diod - digital input / open drain output. figure 2.1 emc1072 pin diagram table 2.1 emc1072 pin description pin number name function type 1 vdd power supply power 2 dp external diode positive (anode) connection aio 3 dn external diode negative (cathode) connection aio 4 therm / addr active low critical therm output signal - requires pull-up resistor to set smbus address od (5v) 5 gnd ground power 6 alert active low digital alert output signal - requires pull-up resistor od (5v) 7 smdata smbus data input/output diod (5v) 8 smclk smbus clock input di (5v) smdata smclk alert vdd dp dn therm / addr gnd 1 23 4 5 87 6 downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 9 revision 1.39 (10-11-10) datasheet chapter 3 electrical specifications 3.1 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 of f. 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 3.1 for the 5v tolerant pins that have a pull-up resistor (smclk, smdata, therm , and alert ), the pull-up voltage must not exceed 3.6v when the device is unpowered. table 3.1 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 3.1 )0 t o 3 . 6v 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-8 thermal resistance ( j-a ) 140.8 c/w esd rating, all pins hbm 2000 v downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 10 smsc emc1072 datasheet 3.2 electrical specifications note 3.2 the alert and therm pins will not glitch low upon power up. table 3.2 electri cal 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 430 850 ua 1 conversion / sec, dynamic averaging disabled 930 1200 ua 4 conversions / sec, dynamic averaging enabled 1120 ua > 16 conversions / sec, dynamic averaging enabled standby supply current i dd 170 230 ua device in standby mode, no smbus communications, alert and therm pins not asserted. power up time t pup 10 15 ms temp selection read note 3.2 time to first data available t conv_1 300 ms internal temperature monitor temperature accuracy 0.25 1 c -5c < t a < 100c 2 c -40c < t a < 125c temperature resolution 0.125 c external temperature monitor temperature accuracy 0.25 1 c +20c < t diode < +110c 0c < t a < 100c 0.5 2 c -40c < t diode < 127c temperature resolution 0.125 c conversion time all channels t conv 190 ms emc1072, default settings capacitive filter c filter 2.2 2.5 nf connected across external diode alert and therm pins output low voltage v ol 0.4 v i sink = 8ma leakage current i leak 5 ua alert and therm pins device powered or unpowered t a < 85c pull-up voltage < 3.6v downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 11 revision 1.39 (10-11-10) datasheet 3.3 smbus electrica l characteristics table 3.3 smbus elec trical 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 ta < 85c hysteresis 420 mv 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 0u s 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 capacitive load c load 400 pf per bus line downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 12 smsc emc1072 datasheet chapter 4 system management bus interface protocol 4.1 system management bus interface protocol theemc1072 communicates with a host controller, su ch as an smsc sio, through the smbus. the smbus is a two-wire serial communication prot ocol between a computer host and its peripheral devices. a detailed timing diagram is shown in figure 4.1 . for the first 15ms after power-up the device may not respond to smbus communications. . the emc1072 is smbus 2.0 compatible and support send byte, read byte, write byte, receive byte, and the alert response address as valid protocols as shown below. all of the below protocols use the convention in ta b l e 4.1 . attempting to communicate with t he emc1072 smbus interface with an invalid slave address or invalid protocol will result in no response from the devic e and will not affect its register contents. stretching of the smclk signal is support ed, provided other devices on the smbus control the timing. 4.2 write byte the write byte is used to write one byte of data to the registers as shown below table 4.2 : figure 4.1 smbus timing diagram table 4.1 protocol format data sent to device data sent to the host # of bits sent # of bits sent table 4.2 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 smdta 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 temperature sensor with selectable address datasheet smsc emc1072 13 revision 1.39 (10-11-10) datasheet 4.3 read byte the read byte protocol is used to read one byte of data from the registers as shown in table 4.3 . 4.4 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 4.4 . 4.5 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. se t via send byte). this is used for consecutive reads of the same register as shown in ta b l e 4.5 . 4.6 alert response address the alert output can be used as a proce ssor interrupt or as an smbus alert. when it detects that the alert pin is asserted, the host will send the alert response address (ara) to the general address of 0001_100xb. all devices with active interrupts will respond with their client address as shown in table 4.6 . table 4.3 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 1 xxh 0 1 -> 0 1001_100 1 1 xx 1 0 -> 1 table 4.4 send byte protocol start slave address wr ack register address ack stop 1 -> 0 1001_100 0 0 xxh 0 0 -> 1 table 4.5 receive byte protocol start slave address rd ack register data nack stop 1 -> 0 1001_100 1 0 xxh 1 0 -> 1 table 4.6 alert response address protocol start alert response address rd ack device address nack stop 1 -> 0 0001_100 1 0 1001_1000 1 0 -> 1 downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 14 smsc emc1072 datasheet the emc1072 will respond to the ara in the following way: 1. send slave address and verify that full slav e address was sent (i.e. the smbus communication from the device was not prematurely stopped due to a bus contention event). 2. set the mask bit to clear the alert pin. application note: the ara does not clear the status register and if the mask bit is cleared prior to the status register being cleared, the alert pin will be reasserted. 4.7 smbus address the emc1072-a smbus address is determined by the pull-up resistor on the therm pin as shown in ta b l e 4.7 . the address decode is performed by pulling known cu rrents from vdd through the external resistor causing the pin voltage to drop based on the respective current / resistor relationship. this pin voltage is compared against a threshold that det ermines the value of the pull-up resistor. the emc1072 responds to hard-wired smbus slave address as shown in table 1.1, "part selection" . 4.8 smbus timeout the emc1072 supports smbus timeout. if the clock line is held low for longer than 30ms, the device will reset its smbus protocol. this function can be enabled by setting the timeout bit in the consecutive alert register (see section 6.11 ). table 4.7 smbus address decode pull up resistor on therm pin smbus address 4.7k 1111_100xb 6.8k 1011_100xb 10k 1001_100xb 15k 1101_100xb 22k 0011_100xb 33k 0111_100xb downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 15 revision 1.39 (10-11-10) datasheet chapter 5 product description the emc1072 is an smbus temperature sensor. t he emc1072 monitors one internal diode and one externally connected temperature 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 inte rnal temperature diodes of the emc1072 and using that data to control the speed of one or more fans. the emc1072 has two levels of monitoring. the first provides a maskable alert signal to the host when the measured temperatures ex ceeds user programmable limits. this allows the emc1072 to be used as an independent thermal watchdog to warn the host of temperature hot spots without direct control by the host. the second level of monitoring provides a non maskable interrupt on the therm pin if the measured temperatures meet or exceed a second programmable limit. figure 5.1 shows a system level block diagram of the emc1072. 5.1 modes of operation the emc1072 has 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. 5.1.1 conversion rates the emc1072 may be configured for different c onversion rates based on the system requirements. the conversion rate is configured as described in section 6.5, "conversion rate register" . the default conversion rate is 4 conversions per second. ot her available conversion rates are shown in ta b l e 6.6, "conversion rate" . figure 5.1 system diagram for emc1072 cpu emc1072 host dpdn smdata thermal diode internal diode smclk smbus interface therm alert power control downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 16 smsc emc1072 datasheet 5.1.2 dynamic averaging dynamic averaging causes the emc1072 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 6.4, "config uration register" ). 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 16x longer than the normal 11 bit operation (nominally 21ms per channel) while still maintaining the selected conversion rate. the benefits of dynamic averaging are impr oved noise rejection due to the longer integration time as well as less random variation of the temperature measurement. when enabled, the dynamic averaging 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 5.1 for the emc1072 . 5.2 therm output the therm output is asserted independently of the alert output and cannot be masked. whenever any of the measured temperatures exceed the user programmed therm limit values for the programmed number of cons ecutive measurements, the therm output is asserted. once it has been asserted, it will remain asserted until all measured temperatures drop below the therm limit minus the therm hysteresis (also programmable). when the therm pin is asserted, the therm status bits will likewise be set. reading these bits will not clear them until the therm pin is deasserted. once the therm pin is deasserted, the therm status bits will be automatically cleared. table 5.1 supply current vs. conversion rate for emc1072 conversion rate average supply current averaging factor (based on 11-bit operation) enabled (default) disabled enabled (default) disabled 1 / 16 sec 660ua 430ua 16x 1x 1 / 8 sec 660ua 430ua 16x 1x 1 / 4 sec 660ua 430ua 16x 1x 1 / 2 sec 660ua 430ua 16x 1x 1 / sec 660ua 430ua 16x 1x 2 / sec 930ua 475ua 16x 1x 4 / sec (default) 950ua 510ua 8x 1x 8 / sec 1010ua 630ua 4x 1x 16 / sec 1020ua 775ua 2x 1x 32 / sec 1050ua 1050ua 1x 1x 64 / sec 1100ua 1100ua 0.5x 0.5x downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 17 revision 1.39 (10-11-10) datasheet 5.2.1 therm pin considerations because of the decode method used to determine th e smbus address it is important that the pull-up resistance on therm pin be within 10% tolerance. addi tionally, the pull-up resistor on the therm pin must be connected to the same 3. 3v supply that drives the vdd pin. for 15ms after power up, the therm pin must not be pulled low or the smbus address will not be decoded properly. if the system requirement s do not permit these conditions, then the therm pin must be isolated from their respective busses during this time. one method of isolating this pin is shown in figure 5.2 . 5.3 alert output the alert pin is an open drain output and requires a pull-up resistor to v dd and has two modes of operation: interrupt mode and comparator mode. the mode of the alert output is selected via the alert / comp bit in the configuration register (see section 6.4 ). 5.3.1 alert pin interrupt mode when configured to operate in interrupt mode, the alert pin asserts low when an out of limit measurement ( > high limit or < low limit) is detected on any diode or when a di ode fault is detected. the alert pin will remain asserted as long as an out-of -limit condition remains. once the ou t-of-limit condition has been removed, the alert pin will remain asserted until the appropriate status bits are cleared. the alert pin can be masked by sett ing the mask bit. once the alert pin has been masked, it will be de-asserted and remain de -asserted until the mask bit is cleared by the user. any interrupt conditions that occur while the alert pin is masked will update the status register normally. the alert pin is used as an interrupt signal or as an smbus alert signal that allows an smbus slave to communicate an error condition to the master. one or more alert outputs can be hard-wired together. 5.3.2 alert pin comparator mode when the alert pin is configured to operate in comp arator mode it will be asserted if any of the measured temperatures exceeds the respective high limit. the alert pin will remain asserted until all temperatures drop below the corresponding high limit minus the therm hysteresis value. figure 5.2 isolating therm pin emc1072 smdata smclk alert vdd dp1 dn1 therm / addr gnd 1 23 4 8 7 65 +3.3v shared therm 22k 4.7k - 33k +2.5 - 5v downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 18 smsc emc1072 datasheet when the alert pin is asserted in comparator mode, the corresponding high limit status bits will be set. reading these bits will not clear them until the alert pin is deasserted. once the alert pin is deasserted, the status bits will be automatically cleared. the mask bit will not block the alert pin in this mode, however the individual channel masks (see section 6.10 ) will prevent the respective channel from asserting the alert pin. 5.4 programmable extern al diode ideality factor the emc1072 is designed for external diodes with an ideality factor of 1.008. not all external diodes, processor or discrete, will have this exact value. this variation of the ideality factor introduces error in the temperature measurement which must be corrected for. this correction is typically done using programmable offset registers. since an ideality fa ctor mismatch introduces an error that is a function of temperature, this correction is only accurate within a small range of te mperatures. to provide maximum flexibility to the user, the emc1072 provides a 6-bit register for each external diode where the ideality factor of the diode used is progra mmed to eliminate errors across all temperatures. 5.5 diode faults the emc1072 detects an open on the dp and dn pi ns, and a short across the dp and dn pins. for each temperature measurement m ade, the device checks for a diode fault on the external diode channel(s). when a diode fault is detected, the alert pin asserts (unless masked, see section 5.6, "consecutive alerts" ) and the temperature data r eads 00h in the msb and lsb registers (note: the low limit will not be checked). a diode fault is define d as one of the followi ng: an open between dp and dn, a short from v dd to dp, or a short from v dd to dn. if a short occurs across dp and dn or a short occurs from dp to gnd, the low limit status bit is set and the alert pin asserts (unless masked). this c ondition is indistinguishable from a temperature measurement of 0.000degc (-64c in extended range) re sulting in temperature data of 00h in the msb and lsb registers. if a short from dn to gnd occurs (with a diode connected), temperature m easurements will continue as normal with no alerts. 5.6 consecutive alerts the emc1072 contains multiple consecutive alert counters. one set of counters applies to the alert pin and the second set of counters applies to the therm pin. each temperature measurement channel has a separate consecutive alert counter for each of the alert and therm pins. all counters are user programmable and determine the number of consecutive meas urements that a temperature channel(s) must be out-of-limit or reporting a dio de fault before the corresponding pin is asserted. see section 6.11 for more details on the co nsecutive alert function. 5.7 digital filter to reduce the effect of noise and temperature spik es on the reported temperat ure, the external diode channel uses a programmable digital filter. this filter can be config ured as level 1, level 2, or disabled. the typical filter performance is shown in figure 5.3, "temperature filter step response" and figure 5.4, "temperature filter impulse response" . downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 19 revision 1.39 (10-11-10) datasheet figure 5.3 temperature filter step response figure 5.4 temperature filter impulse response filter step response 0 10 20 30 40 50 60 70 80 90 024681 01 21 4 sample s temperature (c) disabled level1 level2 filter impulse response 0 10 20 30 40 50 60 70 80 90 0 2 4 6 8 10 12 14 samples temperature (c) disabled level1 level2 downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 20 smsc emc1072 datasheet 5.8 temperature monitors in general, thermal diode temperat ure measurements are based on the change in forward bias voltage of a diode when operated at two different currents. this v be is proportional to absolute temperature as shown in the following equation: 5.9 temperature measur ement results and data the temperature measurement results are stored in the internal and external temperature registers. these are then compared with the values stored in the high and low limit registers. both external and internal temperature measurements ar e stored in 11-bit format with the eight (8) most significant bits stored in a high byte register and the three (3) least significant bits stored in the three (3) msb positions of the low byte regist er. all other bits of the low byte register are set to zero. the emc1072 has two selectable temperature ranges. the default range is from 0c to +127c and the temperature is represented as binary number able to report a temperature from 0c to +127.875c in 0.125c steps. the extended range is an extended temperature ra nge from -64c to +191c. the data format is a binary number offset by 64c. the extended range is used to measure temperature diodes with a large known offset (such as amd processor diodes) wher e the diode temperature plus the offset would be equivalent to a temperature higher than +127c. table 5.2, "emc1072 temperature data format" shows the default and extended range formats. where: k = boltzmanns constant t = absolute temperature in kelvin [1] q = electron charge = diode ideality factor table 5.2 emc1072 temperature data format temperature (c) default range 0c to 127c extended range range -64c to 191c diode fault 000 0000 0000 000 0000 0000 -64 000 0000 0000 000 0000 0000 note 5.2 -1 000 0000 0000 001 1111 1111b 0 000 0000 0000 note 5.1 010 0000 0000 0.125 000 0000 0001 010 0000 0001 1 000 0000 1000 010 0000 1000 64 010 0000 0000 100 0000 0000 65 010 0000 1000 100 0000 1000 127 011 1111 1000 101 1111 1000 127.875 011 1111 1111 101 1111 1111 128 011 1111 1111 note 5.3 110 0000 0000 ? ?? ? ? ?? ? = low high be i i q kt v ln downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 21 revision 1.39 (10-11-10) datasheet note 5.1 in default mode, all temperatures < 0c will be reported as 0c. note 5.2 in the extended range, all temperatur es < -64c will be reported as -64c. note 5.3 for the default range, all temperatures > + 127.875c will be reported as +127.875c. note 5.4 for the extended range, all temperatures > +191.875c wil l be reported as +191.875c. 5.10 external diode connections the emc1072 can be configured to measure a di screte 2n3904 diode-connect ed transistor or an amd processor diode. the diode can be connected as shown in figure 5.5, "diode configurations" . 190 011 1111 1111 111 1111 0000 191 011 1111 1111 111 1111 1000 >= 191.875 011 1111 1111 111 1111 1111 note 5.4 figure 5.5 diode configurations table 5.2 emc1072 temperature data format (continued) temperature (c) default range 0c to 127c extended range range -64c to 191c local ground to dp typical remote substrate transistor e.g. cpu substrate pnp typical remote discrete npn transistor e.g. 2n3904 to dn to dp to dn downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 22 smsc emc1072 datasheet chapter 6 register description the registers shown in ta b l e 6.1 are accessible through the smbus. an entry of - indicates that the bit is not used and will always read 0. table 6.1 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 24 01h r external diode data high byte stores the integer data for the external diode 00h 02h r-c status stores status bits for the internal diode and external diodes 00h page 24 03h r/w configuration controls the general operation of the device (mirrored at address 09h) 18h page 25 04h r/w conversion rate controls the conversion rate for updating temperature data (mirrored at address 0ah) 06h (4/sec) page 26 05h r/w internal diode high limit stores the 8-bit high limit for the internal diode (mirrored at address 0bh) 55h (85c) page 27 06h r/w internal diode low limit stores the 8-bit low limit for the internal diode (mirrored at address 0ch) 00h (0c) 07h r/w external diode high limit high byte stores the integer portion of the high limit for the external diode (mirrored at register 0dh) 55h (85c) 08h r/w external diode low limit high byte stores the integer portion of the low limit for the external diode (mirrored at register 0eh) 00h (0c) 09h r/w configuration controls the general operation of the device (mirrored at address 03h) 00h page 25 0ah r/w conversion rate controls the conversion rate for updating temperature data (mirrored at address 04h) 06h (4/sec) page 26 downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 23 revision 1.39 (10-11-10) datasheet 0bh r/w internal diode high limit stores the 8-bit high limit for the internal diode (mirrored at address 05h) 55h (85c) page 27 0ch r/w internal diode low limit stores the 8-bit low limit for the internal diode (mirrored at address 06h) 00h (0c) 0dh r/w external diode high limit high byte stores the integer portion of the high limit for the external diode (mirrored at register 07h) 55h (85c) 0eh r/w external diode low limit high byte stores the integer portion of the low limit for the external diode (mirrored at register 08h) 00h (0c) 0fh w one shot a write to this register initiates a one shot update. 00h page 28 10h r external diode data low byte stores the fractional data for the external diode 00h page 24 11h r/w scratchpad scratchpad register for software compatibility 00h page 27 12h r/w scratchpad scratchpad register for software compatibility 00h page 27 13h r/w external diode high limit low byte stores the fractional portion of the high limit for the external diode 00h page 27 14h r/w external diode low limit low byte stores the fractional portion of the low limit for the external diode 00h 19h r/w external diode therm limit stores the 8-bit critical temperature limit for the external diode 55h (85c) page 28 1fh r/w channel mask register controls the masking of individual channels 00h page 28 20h r/w internal diode therm limit stores the 8-bit critical temperature limit for the internal diode 55h (85c) page 28 21h r/w therm hysteresis stores the 8-bit hysteresis value that applies to all therm limits 0ah (10c) 22h r/w consecutive alert controls the number of out-of-limit conditions that must occur before an interrupt is asserted 70h page 29 27h r/w external diode 1 ideality factor stores the ideality factor for external diode 1 12h (1.008) page 30 29h r internal diode data low byte stores the fractional data for the internal diode 00h page 24 40h r/w filter control controls the digital filter setting for the external diode channel 00h page 31 fdh r product id stores a fixed value that identifies each product table 6.18 page 32 table 6.1 register set in hexadecimal order (continued) register address r/w register name function default value page downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 24 smsc emc1072 datasheet 6.1 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. 6.2 temperature data registers as shown in ta b l e 6.2 , all temperatures are stored as an 11-bit value with the high byte representing the integer value and the low byte representing the fr actional value left justified to occupy the msbits. 6.3 status register the status register reports the operating status of the internal diode and external diode 1 channels. when any of the bits are set (excluding the busy bit) either the alert or therm pin is being asserted. the alert and therm pins are controlled by the respecti ve consecutive alert counters (see section 6.11 ) and will not be asserted until the programmed consecutive alert count has been reached. the status bits (except etherm and itherm) will remain set until read unless the alert pin is configured as a second therm output (see section 5.3.2 ). feh r smsc id stores a fixed value that represents smsc 5dh page 32 ffh r revision stores a fixed value that represents the revision number 03h page 32 table 6.2 temperature data registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 00h r internal diode high byte 128 64 32 16 8 4 2 1 00h 29h r internal diode low byte 0.5 0.25 0.125 - - - - - 00h 01h r external diode high byte 128 64 32 16 8 4 2 1 00h 10h r external diode low byte 0.5 0.25 0.125 - - - - - 00h table 6.3 status register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 02h r-c status busy ihigh ilow ehigh elow fault etherm itherm 00h table 6.1 register set in hexadecimal order (continued) register address r/w register name function default value page downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 25 revision 1.39 (10-11-10) datasheet bit 7 - busy - this bit indicates that the adc is cu rrently converting. this bi t does not cause either the alert or therm pins to be asserted. bit 6 - ihigh - this bit is set when the intern al diode channel exceeds its programmed high limit. when set, this bit will assert the alert pin. bit 5 - ilow - this bit is set when the internal diode channel drops below its programmed low limit. when set, this bit will assert the alert pin. bit 4 - ehigh - this bit is set when the external diode channel exceeds its programmed high limit. when set, this bit will assert the alert pin. bit 3 - elow - this bit is set when the external diode channel drops below its programmed low limit. when set, this bit will assert the alert pin. bit 2 - fault - this bit is asserted when a diode fault is detected. when set, this bit will assert the alert pin. bit 1 - etherm - this bit is set when the external diode channel exceeds the programmed therm limit. when set, this bit will assert the therm pin. this bit will remain set until the therm pin is released at which point it will be automatically cleared. bit 0 - itherm - this bit is set when the internal diode channel exceeds the programmed therm limit. when set, this bit will assert the therm pin. this bit will remain set until the therm pin is released at which point it will be automatically cleared. 6.4 configuration register the configuration register controls the basic operati on of the device. this register is fully accessible at either address. bit 7 - mask_all - masks the alert pin from asserting. ? 0 (default) - the alert pin is not masked. if any of the appropriate status bits are set the alert pin will be asserted. ? 1 - the alert pin is masked. it will not be asserted for any interrupt condition unless it is configured as a secondary therm pin. the status register will be updated normally. 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 5 - alert/comp - controls the operation of the alert pin. ? 0 (default) - the alert pin acts in interrupt mode as described in section 5.3.1, "alert pin interrupt mode" . ? 1 - the alert pin acts in comparator mode as described in section 5.3.2, "alert pin comparator mode" . in this mode the mask_all bit is ignored. bit 2 - range - configures the measurement range and data format of the temperature channels. ? 0 (default) - the temperature measurement range is 0c to +127.875c and the data format is binary. ? 1 -the temperature measuremen t range is -64c to +191.875c and the data format is offset binary (see table 5.2, "emc1072 temperature data format" ). table 6.4 configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 03h r/w configuration mask_ all run / stop alert/ comp 11r a n g e davg_ dis - 18h 09h downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 26 smsc emc1072 datasheet bit 1 - davg_dis - disables the dynamic av eraging feature on all temperature channels. ? 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 table 5.1, "supply current vs. conversion rate for emc1072" . ? 1 - the dynamic averaging featur e is disabled. all temperature channels will be converted with a maximum averaging factor of 1x (equivalent to 11-bit conversion). for higher conversion rates, this averaging factor will be reduced as shown in table 5.1 . 6.5 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 6.6, "conversion rate" . table 6.5 conversion rate register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 04h r/w conversion rate - - - - conv[3:0] 06h (4/sec) 0ah table 6.6 conversion rate conv[3:0] conversions / second hex 3 2 1 0 0h 0 0 0 0 1 / 16 1h 0 0 0 1 1 / 8 2h 0 0 1 0 1 / 4 3h 0 0 1 1 1 / 2 4h 0 1 0 0 1 5h 0 1 0 1 2 6h 0 1 1 0 4 (default) 7h 0 1 1 1 8 8h 1 0 0 0 16 9h 1 0 0 1 32 ah 1 0 1 0 64 bh - fh all others 1 downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 27 revision 1.39 (10-11-10) datasheet 6.6 limit registers the device contains both high and low limits for al l temperature channels. if the measured temperature exceeds the high limit, then the corr esponding status bit is set and the alert pin is asserted. likewise, if the measured temperature is less than or equal to the low limit, the corresponding status bit is set and the alert pin is asserted. the data format for the limits must match the select ed data format for the temp erature so that if the extended temperature range is used, the limits mu st be programmed in the extended data format. the limit registers with multiple addresses are fully accessible at either address. when the device is in standby mode, updating the li mit 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 6.4 ). 6.7 scratchpad registers the scratchpad registers are read write registers that are used for place holders to be software compatible with legacy programs. reading from th e registers will return what is written to them. table 6.7 temperature limit registers addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 05h r/w internal diode high limit 1 2 86 43 21 6 8 42 1 55h (85c) 0bh 06h r/w internal diode low limit 1 2 86 43 21 6 8 42 1 00h (0c) 0ch 07h r/w external diode high limit high byte 1 2 86 43 21 6 8 42 1 55h (85c) 0dh 13h r/w external diode high limit low byte 0.5 0.25 0.125 - - - - - 00h 08h r/w external diode low limit high byte 1 2 86 43 21 6 8 42 1 00h (0c) 0eh 14h r/w external diode low limit low byte 0.5 0.25 0.125 - - - - - 00h table 6.8 scratchpad register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 11h r/w scratchpad 7 6 5 4 3 2 1 0 00h 12h r/w scratchpad 7 6 5 4 3 2 1 0 00h downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 28 smsc emc1072 datasheet 6.8 one shot register the one shot register is used to initiate a one shot command. writ ing 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. 6.9 therm limit registers the therm limit registers are used to determine w hether a critical thermal event has occurred. if the measured temperature exceeds the therm limit, then the therm pin is asserted. the limit setting must match the chosen data forma t of the temperature reading registers. unlike the alert pin, the therm pin cannot be masked. additionally, the therm pin will be released once the temperature drops below the corresp onding threshold minus the therm hysteresis. 6.10 channel mask register the channel mask register controls individual channel masking. when a channel is masked, the alert pin will not be asserted when the masked channel reads a diode fault or out of limit error. the channel mask does not mask the therm pin. bit 1 - emask - masks the alert pin from asserting when the exte rnal diode channel is out of limit or reports a diode fault. ? 0 (default) - the external diode channel will cause the alert pin to be asserted if it is out of limit or reports a diode fault. table 6.9 one shot register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 0fh w one shot writing to this register initia tes a single conversion cycle. data is not stored and always reads 00h 00h table 6.10 therm limit registers addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 19h r/w external diode therm limit 128 64 32 16 8 4 2 1 55h (85c) 20h r/w internal diode therm limit 128 64 32 16 8 4 2 1 55h (85c) 21h r/w therm hysteresis 128 64 32 16 8 4 2 1 0ah (10c) table 6.11 channel mask register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 1fh r/w channel mask - - - - - - e mask int mask 00h downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 29 revision 1.39 (10-11-10) datasheet ? 1 - the external diode channel will not cause the alert pin to be asserted if it is out of limit or reports a diode fault. bit 0 - intmask - masks the alert pin from asserting when the internal diode temperature is out of limit. ? 0 (default) - the internal diode channel will cause the alert pin to be asserted if it is out of limit. ? 1 - the internal diode channel will not cause the alert pin to be asserted if it is out of limit. 6.11 consecutive alert register the consecutive alert register determines how many times an out-of-limit error or diode fault must be detected in consecutive measurements before the alert or therm pin is asserted. additionally, the consecutive alert register contro ls the smbus timeout functionality. an out-of-limit condition (i.e. hi gh, low, or fault) occurring on the same temperature channel in consecutive measurements will increment the consecutive alert counter. the counters will also be reset if no out-of-limit condition or diode fault condition occurs in a consecutive reading. when the alert pin is configured as an interrupt, when the consecutive alert counter reaches its programmed value, the following will occur: the status bit(s) for that channel and the last error condition(s) (i.e. ehigh) will be set to 1, the alert pin will be asserted, the consecutive alert counter will be cleared, and measurements will continue. when the alert pin is configured as a comparator, the consecutive alert counter will ignore diode fault and low limit errors and only increment if the measured temperature exceeds the high limit. additionally, once the consecutive alert counter reaches the pr ogrammed limit, the alert pin will be asserted, but the counter will not be reset. it will re main set until the temperature drops below the high limit minus the therm hysteresis value. for example, if the calrt[ 2:0] bits are set for 4 consecutive al erts, the high limits are set at 70c, and none of the channels are masked, then the alert pin will be asserted after the following four measurements: 1. internal diode reads 71c and the external diode reads 69c. consecutive alert counter for int is incremented to 1. 2. both the internal diode and the external diode read 71c. consecutive alert counter for int is incremented to 2 and for ext is set to 1. 3. the external diode reads 71c and the internal diode reads 69c. consecutive alert counter for int is cleared and ext is incremented to 2. 4. the internal diode reads 71c and the external diode reads 71c. consecutive alert counter for int is set to 1 and ext is incremented to 3. 5. the internal diode reads 71c and the external diode reads 71c. consecutive alert counter for int is incremented to 2 and ext is incremented to 4. the appropriate status bits are set for ext and the alert pin is asserted. ext counter is reset to 0 and 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. table 6.12 consecutive alert register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 22h r/w consecutive alert time out cthrm[2:0] calrt[2:0] - 70h downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 30 smsc emc1072 datasheet bits 6-4 - cthrm[2:0] - determines the number of consecutive measurements that must exceed the corresponding therm limit before the therm pin is asserted. all temperature channels use this value to set the respective counters. the consec utive therm counter is incremented whenever any measurement exceed the corresponding therm limit. if the temperature drops below the therm limit, then the counter is reset. if a number of consecutive measurements above the therm limit occurs, then the therm pin is asserted low. once the therm pin has been asserted, the consecutive therm counter will not reset until the corresponding temperature drops below the therm limit minus the therm hysteresis value. the bits are decoded as shown in table 6.13 . the default setting is 4 consecutive out of limit conversions. bits 3-1 - calrt[2:0] - determine the number of consecutiv e measurements that must have an out of limit condition or diode fault before the alert pin is asserted. all temperature channels use this value to set the respective counters. the bits are decoded as shown in ta b l e 6.13 . the default setting is 1 consecutive out of limit conversion. 6.12 external diode ideality factor registers these registers store the i deality factors that are applied to the external diodes. ta b l e 6.15 defines each setting and the corresponding ideality factor. table 6.13 consecutive alert / therm settings 210 number of consecutive out of limit measurements 000 1 (default for calrt[2:0]) 001 2 011 3 111 4 (default for cthrm[2:0]) table 6.14 ideality configuration registers addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 27h r/w external diode 1 ideality factor - - ideality[5:0] 12h table 6.15 ideality factor look-up table (diode model) setting factor setting factor setting factor 08h 0.9949 18h 1.0159 28h 1.0371 09h 0.9962 19h 1.0172 29h 1.0384 0ah 0.9975 1ah 1.0185 2ah 1.0397 0bh 0.9988 1bh 1.0200 2bh 1.0410 downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 31 revision 1.39 (10-11-10) datasheet 6.13 filter control register the filter configuration register controls the digital filter on the external diode channel. bits 1-0 - filter[1:0] - control the level of digital filtering that is applied to the external diode temperature measurements. see figure 5.3, "temperature filter step response" and figure 5.4, "temperature filter impulse response" for examples on the filter behavior. 0ch 1.0001 1ch 1.0212 2ch 1.0423 0dh 1.0014 1dh 1.0226 2dh 1.0436 0eh 1.0027 1eh 1.0239 2eh 1.0449 0fh 1.0040 1fh 1.0253 2fh 1.0462 10h 1.0053 20h 1.0267 30h 1.0475 11h 1.0066 21h 1.0280 31h 1.0488 12h 1.0080 22h 1.0293 32h 1.0501 13h 1.0093 23h 1.0306 33h 1.0514 14h 1.0106 24h 1.0319 34h 1.0527 15h 1.0119 25h 1.0332 35h 1.0540 16h 1.0133 26h 1.0345 36h 1.0553 17h 1.0146 27h 1.0358 37h 1.0566 table 6.16 filter configuration register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 40h r/w filter control - - - - - - filter[1:0] 00h table 6.17 filter settings filter[1:0] averaging 10 0 0 disabled (default) 0 1 level 1 10 l e v e l 1 11 l e v e l 2 table 6.15 ideality factor look-up table (diode model) (continued) setting factor setting factor setting factor downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 32 smsc emc1072 datasheet 6.14 product id register the product id register holds a unique value that identifies the device. 6.15 smsc id register (feh) the manufacturer id register contains an 8 bit word that identifies the smsc as the manufacturer of the emc1072. 6.16 revision register (ffh) the revision register contains an 8 bit word that identifies the die revision. table 6.18 product id register a d d rr / wr e g i s t e rb 7b 6b 5b 4b 3b 2b 1b 0d e f a u l t fdh r product id emc1072 00100000 2 0 h table 6.19 manufacturer id register a d d r .r / wr e g i s t e rb 7b 6b 5b 4b 3b 2b 1b 0d e f a u l t f e hrs m s c i d01011101 5 d h table 6.20 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 n00000011 0 3 h downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 33 revision 1.39 (10-11-10) datasheet chapter 7 typical operating curves tem perature error vs. filter capacitor (2n3904, ta = 27c, t diode = 27c, vdd = 3.3v) -1.0 -0.8 -0.5 -0.3 0.0 0.3 0.5 0.8 1.0 0 1000 2000 3000 4000 filter capacitor (pf) temperature error (c) temperature error vs. ambient temperature (2n3904, t diode = 42.5c, vdd = 3.3v) -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 ambient temperature (c) temperature error (c) temperature error vs. external diode temperature (2n3904, ta = 42.5c, vdd = 3.3v) -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 external diode temperature (c) temperature error (c) supply current vs. conversion rate 200 300 400 500 600 700 800 900 1000 1100 1200 1/16 1 /8 1 / 4 1/2 1 2 4 8 1 6 32 64 conversion rate supply current (u a dy namic averaging en a b le d dy namic averaging dis abled downloaded from: http:///
smsc emc1072 34 revision 1.39 (10-11-10) datasheet 1c temperature sensor with selectable address datasheet chapter 8 package information figure 8.1 8-pin msop / tssop package - see spec front page for revision history -- c see detail "a" e d e1 e pin 1 identifier area (d/2 x e1/2) 8x b l l1 0.25 0 - 8 dim and tol per asme y 14. 5m - 1994 finish material decimal x.x x.xx x.xxx 80 arkay drive haup pauge, ny 11788 usa angular print with "scale to fit" do not scale drawing checked approved name drawn dwg number scale title date std compliance unless otherwise specified dime nsions are in millime ters and tolerances are: third angle projection rev sheet revision description revision history released by date package outline 8 pin tssop, 3x3 mm body, 0.65 mm pitch 1 - - 0.1 0.05 0.025 s.k.iliev s.k.iliev s.k.iliev 7/07/04 7/05/04 1:1 7/05/04 mo-8-tssop-3x3 jedec: mo-187 / d 1 of 1 d c seating plane 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" scale: 3/1 not es: 1. all dimensions are in millimeter. 2. tolerance on the true position of the leads is 0.065mm maxi mum. 3. package body dimensions "d" and "e1" do not include mold pr otrusions or flash. maximum mold protrusions or flash is 0.15 mm (0.006 inc hes) per end and side. dimensions "d" and "e1" are determined at datum plane "h". 4. dimension for foot length "l" is measured at the gauge pla ne 0.25mm above the seating plane. 5. details of pin 1 identifier are optional, but must be locate d within the zone indicated. downloaded from: http:///
1c temperature sensor with selectable address datasheet smsc emc1072 35 revision 1.39 (10-11-10) datasheet 8.1 package markings figure 8.2 emc1072 package markings bottom line: 1-t C device number line: 2-t version, revision, country code (vrcc) all top lines center horizontal alignment pb-free/green symbol (matte sn) 2x 1.5pt top e3 pin 1 line: 1-b C date code (yyww) line: 2-b C first 3 digits of lot number 3x 1.5pt pin 1 line: 3-b C last 4 digits of lot number 10 72 xr cc yyww 123 456a downloaded from: http:///
1c temperature sensor with selectable address datasheet revision 1.39 (10-11-10) 36 smsc emc1072 datasheet chapter 9 datasheet revision history table 9.1 customer revision history revision level & date secti on/figure/entry correction revision 1.39 (10-11-10) cover updated temperature accuracy information to match table 3.2, "electrical specifications" . revision 1.38 (03-25-10) table 3.2, "electrical specifications" changed data hold time to 0. note following electrical specifications table changed from: during the power up time, smbus communication is permitted, however the therm pin must be pulled low. to: the alert and therm pins will not glitch low upon power up. figure 5.1, "system diagram for emc1072" changed figure to remove 2-port diode and replace with transistor diode. section 5.10, "external diode connections" updated diode connections text. figure 5.5, "diode configurations" updated diode figure. rev. 1.37 (12-22-09) section 6.16, "revision register (ffh)" changed default from 01h to 03h to match the actual value. rev. 1.36 (10-21-09) table 6.17, "filter settings" added table for bit decode. rev. 1.35 (06-12-09) table 2.1, "emc1072 pin description" identified 5v tolerant pi ns. added the following application note below table: for the 5v tolerant pins that have a pull-up resistor (smclk, smdata, therm , alert ), the voltage difference between vdd and the pull-up voltage must never exceed 3.6v. table 3.1, "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 (smclk, smdata, therm , alert ), the pull-up voltage must not exceed 3.6v when the device is unpowered. table 3.2, "electrical specifications" added leakage current. rev. 1.34 (12-02-08) initial release downloaded from: http:///

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