smsc emc1203/emc1204 datasheet revision 1.1 (06-12-06) datasheet emc1203/emc1204 triple/quad single-wire temp sensor in msop-8 using smsc budgetbus tm sensor interface general description the emc1203 and emc1204 are temperature sensors that communicate with a hos t over a single-wire smsc budgetbus? sensor interf ace. the emc1203 has an internal temperature sensor and monitors up to two remote diodes. an additional remote diode is added with the emc1204 for a total of three remote zones, and both devices are in a small msop-8 package. when used in combination with an smsc super i/o host, such as a keyboard controller, a complete thermal management system is created. a power down mode preserves battery life in portable applications. the internal 11-bit sigma delta temperature-to-d igital converter provides superb linearity, high accuracy and excellent noise immunity. features ? single-wire smsc budgetbus? sensor interface ? low power, 3.0v to 3.6v supply ? < 50ua at 1 conversion per second ? < 2.5ua in standby ? external temperature sensor ? range -63.875 o c to +191.875 o c ? 0.125 o c resolution ? 1 o c accuracy 60 o c to 100 o c ? diode fault reporting ? self contained internal temperature sensor ? range 0 o c to +85 o c ? 0.125 o c resolution ? 3o c accuracy 0o c to 85o c ? msop-8 3x3mm packages; green, lead-free packages also available applications ? desktop computers ? notebook computers ? server applications simplified block diagram part number internal temperature monitor remote temperature monitor emc1203 1 2 emc1204 1 3 emc1203/emc1204 local temp diode switching current temperature registers bbus 11-bit sigma delta adc analog mux dp1 dn1 dp2/dn3 dn2/dp3 bbus interface
order number(s): EMC1203-ACZL-TR in 8 pin msop package (green, lead-free) emc1204-aczl-tr in 8 pin msop package (green, lead-free) reel size is 4,000 pieces. evaluation board available upon request. (evb-kbc1100) 80 arkay drive, hauppauge, ny 11788 (631) 435-6000, fax (631) 273-3123 copyright ? 2006 smsc or its subsidiaries. all rights reserved. circuit diagrams and other info rmation relating to smsc products are included as a means of illustrating typical applications. consequently, complete information sufficient for construction purposes is not necessarily given. although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. smsc reserves the right to make cha nges to specifications and product descriptions at any time withou t notice. contact your local smsc sales office to obtain the latest specifications before plac ing your product order. the prov ision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of smsc or others. a ll sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of smsc's standa rd terms of sale agreement dat ed before the date of you r order (the "terms of sale agreement"). the product may contain d esign defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. anomaly sheets are available upon request. smsc products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. any and all such uses without prio r written approval of an officer of smsc and further testing and/or modification will be fully at the risk of the customer. copie s of this 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. smsc is a registered trademark o f standard microsystems corporation (?smsc ?). product names and company names are the trademarks of their respective holders. smsc disclaims and excludes any and all war ranties, including without li mitation any and all implied warranties of merchantabil ity, fitness for a particular purpose, title, and against infringement and the like, and any and all warranties arising from any cou rse of dealing or usage of trade. in no event shall smsc be liab le for any direct, incidental, i ndirect, 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 w arranty; or otherwise; whether or not any remedy of buyer is h eld to have failed of its essential purpose, and whether or no t smsc has been advised of the possibility of such damages. triple/quad single-wire temp sensor in msop-8 using smsc budgetbus tm sensor interface datasheet revision 1.1 (06-12-06) ii smsc emc1203/emc1204 datasheet
triple/quad single-wire temp sensor in msop-8 using smsc budgetbus tm sensor interface datasheet smsc emc1203/emc1204 1 revision 1.1 (06-12-06) datasheet chapter 1 pin configuration figure 1.1 emc1203 and emc1204 pin configuration 1.1 pin description table 1.1 emc1203 and emc1204 pin description pin pin no. description dp1 1 positive analog connection to external temperature diode 1 dn1 2 negative analog connection to external temperature diode 1 dn2/dp3 3 negative analog connection to external temperature diode 2 positve analog connection to extern al temperature diode 3, emc1204 only dp2/dn3 4 positve analog connection to external temperature diode 2 negative analog connection to extern al temperature diode 3, emc1204 only bbus 5 serial bus interface to bbus host sclk 6 normally gnd, this pin may be configured to source a synchronous clock. gnd 7 ground vdd 8 supply voltage v dd emc1203/ emc1204 top view 8 7 6 5 1 2 3 4 dp1 dn1 dn2/dp3 dp2/dn3 vdd gnd sclk bbus
triple/quad single-wire temp sensor in msop-8 using smsc budgetbus tm sensor interface datasheet revision 1.1 (06-12-06) 2 smsc emc1203/emc1204 datasheet 1.2 absolute maximum ratings note: stresses above those listed could cause damage to the device. this is a stress rating only and functional operation of the device 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 power supplies exhibit voltage spikes on their outputs when the ac power is switched on or off. in addition, voltage transients on the ac power line may appear on the dc output. if this po ssibility exists, it is suggested that a clamp circuit be used. table 1.2 emc1203 and emc1204 maximum ratings description rating unit supply voltage v dd -0.3 to 5.0 v voltage on any other pin -0.3 to v dd +0.3 v operating temperature range 0 to 85 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 power dissipation tbd thermal resistance(at 0 air flow) 109.6 c/w esd rating, all pins human body model 2000 v
triple/quad single-wire temp sensor in msop-8 using smsc budgetbus tm sensor interface datasheet smsc emc1203/emc1204 3 revision 1.1 (06-12-06) datasheet chapter 2 electrical characteristics table 2.1 electrical characteristics v dd =3.0v to 3.6v, t a = 0 c to +85 c, typical values at t a = 27 c unless otherwise noted parameter symbol min typ max units conditions dc power supply voltage v dd 3.0 3.3 3.6 v average operating current i dd 600 650 a active mode (continuous) i pd 1.8 2.5 a standby mode internal temperature measurement accuracy 1 3 c0 c t a 85 c external temperature measurement temperature accuracy remote diode 60 c to 100 c remote diode 0 c to 125 c remote diode 0 c to 125 c 1 3 tbd c c c 15 c t a 70 c 0 c t a 85 c -40 c t a 125 c adc resolution 0.125 c conversion time per sensor 20 ms
triple/quad single-wire temp sensor in msop-8 using smsc budgetbus tm sensor interface datasheet revision 1.1 (06-12-06) 4 smsc emc1203/emc1204 datasheet chapter 3 product description the emc1203 and emc1204 are temperature sens ors with a proprietary single wire smsc budgetbus? sensor interface. te mperature information is commun icated to a host device via the serial bus. all intelligence regarding the interp retation of temperature resides in the host. figure 3.1, "system overview" shows a typical system overview: figure 3.1 system overview in cooperation with the host device, therma l management can be performed as shown in figure 3.1 . thermal management consists of the host acquiring the temperat ure data from the emc1203 and emc1204 controlling the speed of o ne or more fans. the host has the ability to compare measured temperature levels to preset limits and take the a ppropriate action when values are found to be out of limit. the emc1203 and the dp1/dn1 port of the emc1204 are compatible with cpu substrate diodes. two separate temperature zones are monitored using only two pins on the emc1204. this is accomplished using two anti-parallel diodes as shown on the pins dp2/dn3 and dn2/dp3 in figure 3.1 . this technique maintains high accuracy while minimizing pin count and reducing board routing complexity. the anti-parallel diode arch itecture performs very well with diode connected transistors. it is not compatible with substrate transistors (sometimes called thermal diodes or on-chip sense junctions). 3.1 temperature monitors thermal diode temperature measurements are bas ed on the change in forward bias voltage ( v be ) of a diode when operated at two different currents: the change in v be voltage is proportional to absolute temperature t. where: k = boltzmann?s constant t = absolute temperature in kelvin q = electron charge = diode ideality factor emc1203/ emc1204 host (kbc1100) bbus interface dp1 dn1 dp2/dn3 dn2/dp3 bbus ? ? ? ? ? ? ? ? = ? = low high low be high be be i i q kt v v v ln _ _
triple/quad single-wire temp sensor in msop-8 using smsc budgetbus tm sensor interface datasheet smsc emc1203/emc1204 5 revision 1.1 (06-12-06) datasheet figure 3.2 detailed block diagram of temperature monitor architecture figure 3.2 shows a detailed block diagram of the temperature measurement circuit. as shown, the emc1203 and emc1204 incorporates switched capacitor technology that samples the 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 output of the switched capacitor sample and hold circuit interfaces to a single bit delta sigma 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 delta sigma 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 temperature monitor. 3.1.1 emc1203 temper ature monitoring the emc1203, incorporates one internal diode and can monitor two additional temperature zones with two external diodes.an internal analog multiplexer s witches between the internal and external diodes. total conversion time for one internal and two ex ternal temperature readings is about 60ms. the external diodes can be either a cp u substrate diode or a discrete di ode connected transistor like the 2n3904 or 2n3906. external diode connected transistors examples are shown in figure 3.3 : figure 3.3 emc1203 exte rnal diode examples 3.1.2 emc1204 temper ature monitoring the emc1204, incorporates one internal diode and can monitor three external diodes. total conversion time for one internal and three external temperatur e reading is 80ms. an internal multiplexer switches between internal and external diodes. the external thermal diode connected to dp1 and dn1 can delta vbe sample & hold i bias i low i high 1-bit sigma delta modulator digital averaging filter v dd internal or external diod e bias diode 11-bit output local ground to dp typical remote substrate transistor i.e. cpu substrate pnp typical remote discrete pnp transistor i.e. 2n3906 typical remote discrete npn transistor i.e. 2n3904 to dn to dp to dn to dp to dn
triple/quad single-wire temp sensor in msop-8 using smsc budgetbus tm sensor interface datasheet revision 1.1 (06-12-06) 6 smsc emc1203/emc1204 datasheet either be a cpu substrate diode or a regular the rmal diode-connected transistor. external diodes at dp2/dn3 and dn2/dp3 have to be connected in an an ti-parallel fashion. because of this, one diode will be forward biased while the other is reverse bi ased and therefore it is recommended to connect only discrete thermal diodes to these pins. do not use the anti-parallel interface (dp2/dn3 and dn2/dp3) to connect substrate transistors (sometimes called thermal diodes or on-chip sens e junctions). external diode connected transistors examples are shown in figure 3.4 figure 3.4 emc1204 exte rnal diode examples 3.2 smsc budgetbus? sensor interface the emc1203 and emc1204 series of temperature monitors communicate with a host controller, such as the kbc1100, through the smsc budgetbus? sensor interface. the bbus is a single wire serial communication protocol between the computer host and its peripheral devices. please refer to the smsc budgetbus? sensor interface specification for detailed information about the modes of operation. 3.3 power modes the emc1203 and emc1204 have two basic modes of operation: standby mode: the host can initiate standby mode by actively pul ling the bbus low. when the host places the device in standby mode, the device immediately powers down to draw < 2ua of supply current. it will remain in this state until it is awakened by the host. if the host pulls the bbus line low while temperature data is being clocked out, the device will not enter standby mode until completion of the data transfer. after entering standby mode, the device will remain in this mode until it is forced into active mode by the host. the transition from standby to active mode occurs when the host is no longer pulling the bbus low. active mode: the host initiates active mode by enabling a weak pull up on the bbus. in this mode, the emc1203 and emc1204 continuously convert te mperature data. during the time that the device is actively converting a temperature, the bbus is in tri-state mode, and the host places a weak pull-up on the bus to prevent it from fl oating. after a conversion is completed, the device au tomatically clocks out the data from the most recent conversion to the host. w hen the data packet has been entirely clocked out, the bbus returns to tri-state mode, and the a dc begins converting the next temperature sample. while bbus is in tri-state mode, the host can command the device to standby mode. typical remote discrete pnp transistor i.e. 2n3906 typical remote discrete npn transistor i.e. 2n3904 to dp2/dn3 to dn2/dp3 to dp2/dn3 to dn2/dp3
triple/quad single-wire temp sensor in msop-8 using smsc budgetbus tm sensor interface datasheet smsc emc1203/emc1204 7 revision 1.1 (06-12-06) datasheet 3.4 temperature data format temperature readings are coded in 2?s complement format with a -64oc offset. this format spans from ?63.875oc to +191.875oc with 0.125o c resolution. a temperature measurement outside this range is reported as either ?63.875oc or +191.875oc. the host must add 64oc to calculate the actual temperature. ta b l e 3 . 1 shows example temperature readings and the value that will be reported on the bbus. as shown in ta b l e 3 . 1 , 400h is reserved for diode fault signaling which occurs when open or short conditions are detected between the external dp and dn pins. 3.5 conversion rate the conversion rate can be controlled by the host. this is accomplished by periodically placing the device in standby as described in section 3.3 . table 3.1 temperature data format actual temp. ( o c) 2?s complement of -64 o c offset hex diode fault 100 0000 0000 400 -63.875 100 0000 0001 401 -63.000 100 0000 1000 408 -1.000 101 1111 1000 5f8 0.000 110 0000 0000 600 +0.125 110 0000 0001 601 +1.000 110 0000 1000 608
triple/quad single-wire temp sensor in msop-8 using smsc budgetbus tm sensor interface datasheet revision 1.1 (06-12-06) 8 smsc emc1203/emc1204 datasheet chapter 4 package outline figure 4.1 8-pin msop package ou tline - 3x3mm body 0.65mm pitch 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. table 4.1 8-pin msop package parameters 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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