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smsc emct03 datasheet revision 2.3 (04-19-05) datasheet emct03 1c triple smbus temperature sensor general description the emct03 is a system management bus (smbus) temperature sensor that is capable of monitoring three temperature zones. the three temperature zones consist of two external a nd one internal temperature diode. the internal 11 bit sigma-delta adc architecture with digital filtering attributes to superb linearity and immunity to interference and noise. an extended temperature format may be se lected for compatibility with a broad range of cpus. selectable conversion rates and standby mode support low-power operation. features low power; 3.0v to 3.6v supply ? programmable conversion rate ? < 1ma at 16 conversions per second ? < 3ua in standby mode smbus 2.0 compliant interface two external temperature monitors: ? range -64 c to +191 c ? 0.125 c resolution ? 1 c accuracy 40 c to 80 c ? diode fault reporting internal temperature monitor ? range 0 c to +85 c ? 0.125 c resolution ? 3 c accuracy 0 c to 85 c programmable conversion rate msop-8 3x3mm package; green, lead-free package also available. simplified block diagram emct03 local temp diode switching current smclk local temp register configuration register status register smbus interface remote temp register 1 remote temp register 2 smdata 11-bit sigma delta adc analog mux dp1 dn1 dp2 dn2 digital mux and byte interlock
order number(s): emct03-aczb for 8-pin msop package emct03-aczb-tr for 8-pin msop package (tape and reel) emct03-aczl for 8-pin msop package (green lead-free) EMCT03-ACZL-TR for 8-pin msop package (green lead-free, tape and reel) evaluation board available upon request. 80 arkay drive hauppauge, ny 11788 (631) 435-6000 fax (631) 273-3123 copyright ? smsc 2005. all rights reserved. circuit diagrams and other information relating to smsc products are included as a means of illustrating typical applications. consequently, complete information sufficient for construction purposes is not necessarily given. although the information has been checked a nd is believed to be accurate, no responsibility is assumed for inaccuracies. smsc reserves the right to make changes to specifications and product d escriptions at any time without notice. contact your local smsc sales office to obtain the latest specifications before placing your product order . the provision of this information does not convey to the purchaser of the described se miconductor devices any licenses under any patent rights or oth er intellectual property rights of smsc or others. all sales are expressly conditional on your agreement to the terms and conditions of the mos t 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 specifica tions. anomaly sheets are available upon request. smsc products are not designed, intended, authorized or warranted for use in any life suppor t or other application where product failure could cause or contribute to personal injury or severe property damage. any and all such uses without prior written approval of an officer of smsc and further testing and/or modification will be fully at the risk of the customer. copies of thi s document or other smsc literature, as well as the terms of sale agreement, may be obtained by visiting smsc?s website at http://www.smsc.com. sms c is a registered trademark of standard microsystems corporation (?smsc?). product names and company names are the trademarks of their respective holders. smsc disclaims and excludes any and all warranties, including without 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 damages; 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. 1c triple smbus temperature sensor datasheet revision 2.3 (04-19-05) 2 smsc emct03 datasheet
1c triple smbus temperature sensor datasheet smsc emct03 3 revision 2.3 (04-19-05) datasheet chapter 1 pin configuration figure 1.1 emct03 pin configuration table 1.1 pin description pin pin no. description dp1 1 positive analog input for external temperature diode 1 dn1 2 negative analog input for external temperature diode 1 dp2 3 positive analog input for external temperature diode 2 dn2 4 negative analog input for external temperature diode 2 gnd 5 ground vdd 6 supply voltage smdata 7 system management bus data input/output, open drain output smclk 8 system management bus clock input table 1.2 absolute maximum ratings description rating unit supply voltage vdd -0.3 to 5.0 v voltage on any other pin -0.3 to vdd+0.3 v operating temperature range 0 to 85 c storage temperature range -55 to 150 c esd rating, all pins human body model 2000 v emct03 top view 8 7 6 5 1 2 3 4 dp1 dn1 dp2 dn2 smclk smdata vdd gnd
1c triple smbus temperature sensor datasheet revision 2.3 (04-19-05) 4 smsc emct03 datasheet chapter 2 electrical characteristics vdd=3.3v10%, ambienttemp=0 c to 85 c, except as noted below. characteristic min typ max unit dc power supply voltage vdd 3.0 3.3 3.6 v current consumption from vdd: 16 sets of conversions per second 8 sets of conversions per second 4 full sets of conversions per second 2 full sets of conversions per second 1 full set of conversions per second power down 3 1.75 1 700 500 3 ma ma ma a a a por threshold 2.5 v internal temperature monitor temperature accuracy ambient temp 0 c to 85 c 1 3 c temperature resolution 0.125 c two external temperature monitors temperature accuracy remote diode 40 c to 80 c, ambient temp 15 c to 70 c remote diode 0 c to 125 c 1 3 c c temperature resolution 0.125 c current source low level high level 10 170 a a adc conversion time for all three sensors 60 ms wake-up from stop mode (during one shot command or transition to run mode) 1ms resolution 11 bit differential non linearity 1lsb integral non linearity 1lsb
1c triple smbus temperature sensor datasheet smsc emct03 5 revision 2.3 (04-19-05) datasheet figure 2.1 system management bus timing diagram vdd=3.3v10%, temp=0 c to 85 c, unless otherwise noted. characteristic min typ max unit system management bus timing operating frequency, f smb 10 400 khz spike suppression 50 ns bus free time start to stop, t buf 1.3 s hold time start t hd:sta 0.6 s setup time start t su:sta 0.6 s setup time stop t su:sto 0.6 s data hold time t hd:dat 0.3 0.9 s data setup time t su:dat 100 ns clock low period t low 1.3 s clock high period t high 0.6 s clock/data fall time, tf 300 ns clock/data rise time, tr 300 ns system management bus smclk, smdata input high current 10 a input low current -10 a input capacitance 10 pf low input level 0.8 v high input level 2.0 v hysteresis 500 mv low output level @ 4ma 0.4 v smdata smclk t low t r t high t f 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
1c triple smbus temperature sensor datasheet revision 2.3 (04-19-05) 6 smsc emct03 datasheet chapter 3 product description the emct03 is an smbus sensor that is capabl e of monitoring three temperature zones. the part may be used as a companion to one of smsc?s broad line of sio host circuits, or other devices capable of performing the smbus host function. figure 3.1 system overview in cooperation with the host device, therma l management can be performed as outlined in figure 3.1 above. thermal management consists of the host read ing the temperature data from the remote and internal temperature diodes of the emct03 and cont rolling the speed of one or multiple fans. since the emct03 incorporates one internal and two exte rnal temperature diodes, three separate thermal zones can be monitored and controlled with this application. also, measured temperature levels can quickly be compared to preset limits within the host device which in turn will take the appropriate action when values are found to be out of limit. the emct03 has two basic modes of operation: run mode: in this mode, the emct03 continuou sly converts temperature data and updates its registers. the conversion rate is configured by the lower bits in the configuration register as described in table 3.11, "configuration register, conversion rate," on page 11 . standby mode: in this mode, the emct03 is po wered down, drawing a maximum current of only 3ua. the smbus is still operational and a one-s hot command can be given which will force the circuit to complete one full set of temperature conversions. the emct03 will return to standby mode after the one shot conversion has finished. 3.1 temperature monitors thermal diode temperature measurem ents are based on the change in forward bias voltage of a diode when operated at two different currents: where: k is boltzmann?s constant t is absolute temperature in kelvin q is charge electron n is diode ideality factor the change in forward bias voltage is now proportional to absolute temperature t. emct03 host (smsc sio) smbus interface dp1 dn1 smbus internal diode dp2 dn2 ? ? ? ? ? ? ? ? = ? low high low be high be i i q kt n v v ln _ _ (1)
1c triple smbus temperature sensor datasheet smsc emct03 7 revision 2.3 (04-19-05) datasheet figure 3.2 block diagram of temperature measurement circuit figure 3.2 shows a detailed block diagram of the temperature measurement circuit. as shown, the emct03 incorporates switched capacitor technology that samples the external remote temperature diode voltage at two bias currents and holds the difference voltage. the sample frequency is 100khz and the current levels ihigh and ilow are 170ua and 10ua respectively. the negative terminal for the remote temperature diode, dn, is internally bi ased with a forward diode voltage referenced to ground. the output of the switched capacitor sample and hol d circuit interfaces to a single-bit sigma delta analog-to-digital converter. this adc runs at 100khz sample frequency and its output is digitally filtered and averaged over 2048 samples effectively generating 11 bit accuracy. the advantages of this architecture over nyquist rate flash or sar converters are superb linearity and inherent noise immunity. the linearity can be di rectly attributed to the sigma delta adc single-bit comparator while the noise immunity is achieved by the digital averaging filter. the overall effective bandwidth of the system is fs/2048 which transla tes to a 50hz bandwidth at 100khz sample rate. conversion time equals about 20ms per temperatur e monitor which equals 60ms total for three monitors when configured for maximum conversion rate (default). the 11 bit conversion can be displayed in either legacy format or in extended range format. in legacy format, the temperature range covers ?64oc to 127 oc while in extended format, temperature readings span -64oc to 191oc. it should be noted that the latt er range is really meant to cover thermal diodes with a non ideal curvature caused by factor n in equation (1) not being equal to exactly 1.000. in general, it is not recommended to run silicon ba sed thermal diodes at te mperatures above 150oc. 3.2 system management bus interface protocol the emct03 communicates with a host controller, such as an smsc sio, through the smbus. the smbus is a two wire serial communication protocol between a computer host and its peripheral devices. detailed timing diagrams can be found in the electrical characteristics of the smbus. the emct03 is smbus 2.0 compatible and supports write byte and read byte as valid protocols as shown below: fs delta vbe sample & hold i bias i low i high fs 1-bit sigma delta modulator fs digital averaging filter fs/2048 11-bit accurate conversion v dd internal or remote diode bias diode
1c triple smbus temperature sensor datasheet revision 2.3 (04-19-05) 8 smsc emct03 datasheet 3.2.1 write byte the write byte is used to write one byte of data to the registers as shown in table 3.1 below: 3.2.2 read byte the read byte protocol is used to read one byte of data from the registers as shown in ta b l e 3 . 2 below: 3.2.3 smbus address attempting to communicate with th e emct03 smbus interface with an invalid slave address or invalid protocol, results in no response from the part an d will not affect its register content. the emct03 supports stretching of the smclk signal by ot her devices on the smbus but will not perform this operation itself. 3.3 register allocation the following registers are accessible through the smbus: table 3.1 smbus write byte protocol start slave address wr ack register address ack register data ack stop 1711 8 1 8 11 table 3.2 smbus read byte protocol start slave address wr ack register address ack start slave address rd ack register data nack stop 1711 8 11 711811 table 3.3 smbus address condition emct03 address emct03 default address 1001100xb table 3.4 register table register read address register write address register name default value 00h n/a legacy format internal temperature high byte 00h 23h n/a legacy format internal temperature low byte 00h 01h n/a legacy format remote temperature 1 high byte 00h 10h n/a legacy format remote temperature 1 low byte 00h f8h n/a legacy format remote temperature 2 high byte 00h f9h n/a legacy format remote temperature 2 low byte 00h
1c triple smbus temperature sensor datasheet smsc emct03 9 revision 2.3 (04-19-05) datasheet during power on reset (por), the default values ar e stored in the registers. a por is initiated when power is first applied to the part and the vo ltage on the vdd supply surpasses the por level as specified in the electrical characte ristics. any reads to undefined regist ers will return 00h. writes to any undefined registers will not have an effect. the emct03 uses an interlock mechanism that prev ents changes in register content when fresh readings come in from the adc during successive reads from a host. when the high byte is read, the last conversion value is latched into the high byte and low byte. please note that the interlock mechanism is only effective when reading the high byte first. 3.4 temperature monitor registers as shown in table 3.4 , each temperature monitor has two byte wide data registers. the external monitors are equipped with both legacy and ext ended data format. the 11 bit data temperature is stored aligned to the left resulting in the high byte to contain temperature in 1 c steps and the low byte to contain fractions of c as outlined below: fah n/a extended format remote temperature 1 high byte 00h fbh n/a extended format remote temperature 1 low byte 00h fch n/a extended format remote temperature 2 high byte 00h fdh n/a extended format remote temperature 2 low byte 00h 02h n/a status register 00h 03h 09h configuration register 47h n/a 0fh one shot command -- feh n/a manufacturer identifier 5dh ffh n/a silicon revision identifier 01h 11h, 16h, 4ah, 60h, 61h, 62h, 79h, 7ah 11h, 16h, 4ah, 60h, 61h, 62h, 79h, 7ah reserved registers for production test table 3.5 high byte temperature register register bit 7bit 6bit 5bit 4bit 3bit 2bit 1bit 0 temperature high byte registers 00h, 01h, f8h, fah, fch sign6432168421 table 3.6 low byte temperature register register bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 temperature low byte registers 23h, 10h, f9h, fbh, fdh 0.5000.2500.12500000 table 3.4 register table (continued) register read address register write address register name default value
1c triple smbus temperature sensor datasheet revision 2.3 (04-19-05) 10 smsc emct03 datasheet 3.5 legacy temperature data fo rmat registers 00h, 23h, 01h, 10h, f8h, f9h: for registers displaying legacy temperature data fo rmat, the temperature range spans from ?63.875oc to +127.875oc with 0,125oc resolution. temperatures outside this range are clipped to ?63.875oc and +127.875oc. data is stored in the regist ers in 2?s complement as shown in ta b l e 3 . 7 : 3.6 extended temperature data format registers fah, fbh, fch, fdh for registers displaying extended temperature data format, a value of 64d is subtracted from the legacy format output. this effectively extends the range to cover higher external temperature measurements while still maintaining the 2?s comple ment format. obviously, the host will have to compensate and add 64d to the read temperatur e data. this format spans from ?63.875oc to +191.875oc with 0.125oc resolution. temperatures outside this range are limited to ?63.875oc and +191.875oc. table 3.8 shows example temperature readings and register content for this data format. table 3.7 legacy temperature data format temperature ( c) 2?s complement hex diode fault 1000 0000 0000 0000 8000 = -63.875 1100 0000 0010 0000 c020 -63 1100 0001 0000 0000 c100 -1 1111 1111 0000 0000 ff00 0 0000 0000 0000 0000 0000 +0.125 0000 0000 0010 0000 0020 +1 0000 0001 0000 0000 0100 +127 0111 1111 0000 0000 7f00 +127.875 0111 1111 1110 0000 7fe0 table 3.8 extended temperature data format actual temp. ( c) -64 c offset ( c) 2?s complement of -64 c offset hex diode fault 1000 0000 0000 0000 8000 = -63.875 -127.875 1000 0000 0010 0000 8020 -63 -127 1000 0001 0000 0000 8100 -1 -65 1011 1111 0000 0000 bf00 0 -64 1100 0000 0000 0000 c000 +0.125 -63.875 1100 0000 0010 0000 c020 +1 -63 1100 0001 0000 0000 c100 +63 -1 1111 1111 0000 0000 ff00 +64 0 0000 0000 0000 0000 0000
1c triple smbus temperature sensor datasheet smsc emct03 11 revision 2.3 (04-19-05) datasheet table 3.7 and ta b l e 3 . 8 show that temperature data is stored in 2?s complement in both legacy and extended temperature data format. both extended and legacy temperature formats are updated simultaneously after every conversion cycle. code 8000h is reserved for diode fault signaling which occurs when open or short conditions are pr esent between the external dp and dn pins. 3.7 status register the status register is a read only register and return s the operational status of the part. it indicates an external diode fault conditions through bit 0 and 1. when either d1 or d2 is set, a faulty diode connection is detected for external diode 1 or external diode 2 respectively. also, when diode faults are detected, temperature readings for the faulty external diode will return 8000h. the emct03 detects both open and short conditions for the dp1/2 and dn1/2 pins. bit 7 of the status register will be set when the internal adc is busy converting data. 3.8 configuration register bits 0 through bit 2 of the configuration regi ster set the adc conversion rate of the part: +65 1 0000 0001 0000 0000 0100 +191 127 0111 1111 0000 0000 7f00 = +191.875 127.875 0111 1111 1110 0000 7fe0 table 3.9 status register register bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 def status busy - - - - - d2 d1 00h table 3.10 configuration register register bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 def configuration - nrun/stop - - - cr2 cr1 cr0 47h table 3.11 configuration register, conversion rate cr2, cr1, cr0 conversion rate 000 reserved 001 reserved 010 reserved 011 1 conversions per second 100 2 conversions per second 101 4 conversions per second 110 8 conversions per second 111 16 conversions per second table 3.8 extended temperature data format (continued) actual temp. ( c) -64 c offset ( c) 2?s complement of -64 c offset hex
1c triple smbus temperature sensor datasheet revision 2.3 (04-19-05) 12 smsc emct03 datasheet a conversion for all 3 temperature readings take s about 60ms. therefore, the maximum conversion rate, equals 16 conversions per second. bits 6 set of the configuration regist er sets the power mode of the part: in run mode, the emct03 will opera te at the preset conversion ra te. in standby mode, the part is powered down to minimize current consumption. the smbus is fully operational in either mode. in standby mode, a write command to the one shot regi ster will trigger a one time conversion of the 3 temperature monitors. after the part finishes th e conversion, it will go back to standby mode. the host can now read the updated temperature information. table 3.12 configuration registers data format nrun/stop description 0 run mode 1 standby mode
1c triple smbus temperature sensor datasheet smsc emct03 13 revision 2.3 (04-19-05) datasheet chapter 4 application information this chapter provides information on maintaining accuracy when using diodes as remote sensors with smsc environmental monitoring and control devices. it is assumed that the users have some familiarity with hardware design and transistor characteristics. smsc supplies a family environmental monitoring and control (emc) devices that are capable of accurately measuring temperatures. most devices include an internal temperature sensor along with the ability to measure one or more external sensor s. the characteristics of an appropriate diode for use as the external sensor are listed in this chap ter. recommendations for the printed circuit board layout are provided to help reduce error ca used by electical noise or trace resistance. 4.1 maintaining accuracy 4.1.1 physical factors temperature measurement is performed by measuring the change in forward bias voltage of a diode when two different currents are forced through the junction. the circuit board itself can impact the ability to accurately measure thes e small changes in voltage. for example, an excessive amount of series resistance can introduce error in the measurement. 4.1.1.1 layout apply the following guidelines when designing the printed circuit board: 1. route the remote diode traces on the top layer. 2. place a ground guard signal on both sides of the differential pair. this guard band should be connected to the ground plane at least every 0.25 inches. 3. place a ground plane on the layer immediately below the diode traces. 4. keep the diode traces as short as possible. 5. keep the diode traces parallel, and the length of the two traces ident ical within 0.3 inches. 6. use a trace width of 0.01 inches with a 0.01 inch guard band on each side. 7. keep the diode traces away from sources of high frequency noise such as power supply filtering or high speed digital signals. 8. when the diode traces must cross high speed di gital signals, make them cross at a 90 degree angle. 9. avoid joints of copper to solder that can introduce thermocouple effects. these recommendations are illustrated in figure 4.1 routing the diode traces on page 14 .
1c triple smbus temperature sensor datasheet revision 2.3 (04-19-05) 14 smsc emct03 datasheet figure 4.1 routing the diode traces 4.1.1.2 bypass capacitors accurate temperature measurements require a clean, stable power supply. locate a 0.1f capacitor as close as possible to the power pin with a good ground. a low esr capacitor (such as a 10f ceramic) should be placed across the power source. add additional power supply filtering in systems that have a noisy power supply. a capacitor may be placed across th e dp/dn pair at the remote sensor in noisy environments. do not exceed a value of 100 pf if this capacitor is installed. 4.1.1.3 manufacturing circuit board assembly processes may leave a residue on the board. this residue can result in unexpected leakage currents that may introduce errors if the circuit board is not clean. for example, processes that use water-soluble soldering fluxes have been known to cause problems if the board is not kept clean. 4.1.1.4 thermal considerations keep the sensor in good thermal contact with the co mponent to be measured. the temperature of the leads of a discrete diode will greatly impact the temperatur e of the diode junction. make use of the printed circuit board to disperse any self-heating that may occur. 4.1.1.5 remote sensors connected by cables when connecting remote diodes with a cable (instead of traces on the pcb) use shielded twisted pair cable. the shield should be attached to ground ne ar the emct03, and should be left unconnected at the sensor end. belden 8451 cable is a good choice for this application. 4.1.2 sensor characteristics the characteristics of the diode junction used for temperature sensing will affect the accuracy of the measurement. 4.1.2.1 selecting a sensor a diode connected small signal transistor is reco mmended. silicon diodes are not a good choice for remote sensors. small signal transistors such as the 2n3904 or the 2n3906 are recommended. desired characteristics for the sensor include the following: 1. constant value of h fe in the range of 7.5 to 130 microamps. variation in h fe from one device to another or one manufacturer to another cancels out of the te mperature equations. copper trace copper trace .01 wide min. .01 gap min. .01 wide min. gnd plane .01 gap min. gnd plane .01 gap min. copper plane (to shield from noise) board material recommend via stictching at .25 inch intervals. dp or dn dp or dn
1c triple smbus temperature sensor datasheet smsc emct03 15 revision 2.3 (04-19-05) datasheet 2. the lowest emitter and base resistance values will also be helpful as a matter of series input resistance 4.1.2.2 compensating for ideality of the diode the remote diode may have an ideality factor based on the manufacturing proce ss. inaccuracy in the temperature measurement resulting from this idealit y factor may be eliminated by calibrating the remote diode with the temperature sensor. the emct 03 is trimmed to an id eality factor of 1.008. 4.1.2.3 circuit connections the more negative terminal for the remote temperatur e diode, dn, is internal ly biased with a forward diode voltage. terminal dn is not referenced to ground. remote temperature diodes can be constructed as shown in figure 4.2 remote temperature diode examples on page 15 . figure 4.2 remote temperature diode examples environmental monitoring and control (emc) dev ices supplied by smsc are designed to make accurate temperature measurements. careful design of the printed circuit board and proper selection of the remote sensing diode will help to maintain the accuracy. to dp to dn local ground typical remote parasitic substrate transistor e.g. cpu substrate pnp to dp to dn to dp to dn typical remote discrete pnp transistor e.g 2n3906 typical remote discrete npn transistor e.g. 2n3904
1c triple smbus temperature sensor datasheet revision 2.3 (04-19-05) 16 smsc emct03 datasheet chapter 5 package outline figure 5.1 8-pin msop package outline - 3x3mm body 0.65mm pitch table 5.1 8-pin msop package parameters notes: 1. controlling unit: millimeters. 2. tolerance on the true position of the leads is 0.065 mm maximum. 3. package body dimensions d and e1 do not includ e mold protrusion or flash. dimensions d and e1 to be determined at datum plane h. maximum mo ld protrusion or flash is 0.15mm (0.006 inches) per end, and 0.15mm (0.006 inches) per side. 4. dimension for foot length l measured at the gauge plane 0.25 mm ab ove the seating plane. 5. details of pin 1 identifier are optional but must be located within the zone indicated. min nominal max remarks a 0.80 ~ 1.10 overall package height a1 0.05 ~ 0.15 standoff a2 0.75 0.85 0.95 body thickness d 2.80 3.00 3.20 x body size e 4.65 4.90 5.15 y span e1 2.80 ~ 3.20 y body size h 0.08 ~ 0.23 lead foot thickness l 0.40 ~ 0.80 lead foot length l1 0.95 ref lead length e 0.65 bsc lead pitch 0 o ~8 o lead foot angle w 0.22 ~ 0.38 lead width ccc ~ ~ 0.10 coplanarity

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