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? semiconductor components industries, llc, 2000 november, 2000 rev. 1 1 publication order number: mc74/d mc74 serial digital temperature sensor the mc74 is a serial digital temperature sensor suited for low cost applications. temperature data is converted from the integrated thermal sensing element and made available as an 8bit serial digital word. communication with the mc74 is accomplished via 2wire smbus/i 2 ccompatible serial port. temperature resolution is 1 c. conversion rate is a nominal 8 samples/sec. power consumption is only 200 m a (5.0 m a standby). features ? temperature range: 40 c to +125 c ? outputs temperature as an 8bit digital word ? simple serial port interface ? solid state temperature sensing: 2 c accuracy from +25 c to +85 c 3 c accuracy from 0 c to +125 c ? 3.3 v and 5.5 v operating range ? low power 200 m a operations 5.0 m a standby mode typical applications ? thermal protection for hard disk drives and other pc peripherals ? lowcost thermostat controls ? power supplies functional block diagram internal sensor (diode) serial port interface sda scl control logic modulator temperature register http://onsemi.com ordering information 1 sot23a* note: *sot23a is equivalent to eiajsc74a pin connections sot23 sn suffix case 1212 1 2 3 4 5 1 5 to220 t suffix case 314d 2 3 5 4 (top view) nc gnd v dd scl sda see detailed ordering and shipping information on page 9 of this data sheet. see general marking information in the device marking section on page 9 of this data sheet. device marking information
mc74 http://onsemi.com 2 pin description for to2205 pin no. symbol type description 1 nc none not connected 2 sda bidirectional smbus serial data 3 gnd power system ground 4 scl input smbus serial clock 5 v dd power power supply input pin description for sot235 pin no. symbol type description 1 nc none not connected 2 gnd power system ground 3 v dd power power supply input 4 scl input smbus serial clock 5 sda bidirectional smbus serial data pin description scl smbus serial clock input. clocks data into and out of the mc74. see system management bus specification, rev. 1.0, for timing diagrams. sda bidirectional input/output. serial data is transferred on the smbus in both directions using this pin. see system management bus specification rev. 1.0 for timing diagrams. v dd power supply input. see electrical specifications. gnd ground return for all mc74 functions. absolute maximum ratings* rating symbol value unit power supply voltage v dd 6.0 v voltage on any pin (gnd 0.3 v) to (v dd +0.3 v) v operating temperature range t a 40 to +125 c storage temperature range t stg 65 to +150 c current on any pin 50 ma package thermal resistance r q ja 330 c/w *maximum ratings are those values beyond which damage to the device may occur. *staticsensitive device. unused devices must be stored in conductive material. protect devices from static discharge and static fields. stresses above those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only and f unctional operation of the device at these or any other conditions above those indicated in the operational sections of the specification s is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability.
mc74 http://onsemi.com 3 dc electrical characteristics (v dd = 3.3 v or 5.0 v (note 5.), 40 c t a 125 c, unless otherwise noted.) characteristic symbol min typ max unit power supply poweron reset threshold (v dd falling edge or rising edge) v por 1.2 2.2 v operating current (v dd = 5.5v, serial port inactive) (note 1.) i dd 200 350 a standby supply current (v dd = 3.3 v, serial port inactive) (note 4.) i ddstandby 5.0 10 a temperaturetobits converter temperature accuracy mc74a +25 c t a +85 c 0 c t a +125 c 40 c t a 0 c t err 2.0 3.0 2.0 +2.0 +3.0 c conversion rate (note 2.) cr 4.0 8.0 sa/sec serial port interface logic input high v ih 0.8 x v dd v logic input low v il 0.2 x v dd v sda output low i ol = 3 ma (note 3.) i ol = 6 ma (note 3.) v ol 0.4 0.6 v input capacitance sda, scl c in 5.0 pf i/o leakage i leak 1.0 0.1 1.0 a serial port ac timing (v dd = 3.3 v or 5.0 v (note 5.), 40 c (t a = t j ) 125 c; c l = 80 pf unless otherwise noted.) characteristic symbol min typ max unit smbus clock frequency f smb 10 100 khz low clock period (10% to 10%) t low 4.7 sec high clock period (90% to 90%) t high 4.0 sec smbus rise time (10% to 90%) t r 1,000 nsec smbus fall time (90% to 10%) t f 300 nsec start condition setup time (90% scl to 10% sda) (for repeated start condition) t su(start) 4.0 sec start condition hold time t h(start) 4.0 sec data in setup time t sudata 1,000 nsec data in hold time t hdata 1,250 nsec stop condition setup time t su(stop) 4.0 sec bus free time prior to new transition t idle 4.7 sec poweron reset delay (v dd v por (rising edge)) t por 500 sec 1. operating current is an average value integrated over multiple conversion cycles. transient current may exceed this specifica tion. 2. maximum guaranteed conversion time after poweron reset (por to data_rdy) is 250 msec. 3. output current should be minimized for best temperature accuracy. power dissipation within the mc74 will cause selfheating a nd temperature drift error. 4. sda and scl must be connected to v dd or gnd. 5. v dd = 3.3 v for mc7433sntr. v dd = 5.0 v for mc7450t. all part types of the mc74 will operate properly over the wider power supply range of 2.7 v to 5.5 v. each part type is tested and specified for rated accuracy at its nominal supply voltage. as v dd varies from the nominal value, accuracy will degrade 1 c/v of v dd change.
mc74 http://onsemi.com 4 detailed operating description the mc74 acquires and converts temperature information from its integrated solid state sensor with a basic accuracy of 1 c . it stores the data in an internal register which is read through the serial port. the system interface is a slave smbus. the temperature data can be read at any time through the smbus port. eight smbus addresses are programmable for the mc74, which allows for a multisensor configuration. also, there is lowpower standby mode where temperature acquisition is suspended. standby mode the mc74 allows the host to put it into a low power (i dd = 5.0 m a, typical) standby mode. in this mode, the a/d converter is halted and the temperature data registers are frozen. the smbus port operates normally. standby mode is enabled by setting the shdn bit in the config register. the table below summarizes this operation. standby mode operation shdn bit operating mode 0 normal 1 standby smbus slave address the mc74 is internally programmed to have a default smbus address value of 1001 101b. seven other addresses are available by custom order (contact factory). serial port operation the serial clock input (scl) and bidirectional data port (sda) form a 2wire bidirectional serial port for programming and interrogating the mc74. the following conventions are used in this bus architecture: mc74 serial bus conventions term explanation transmitter the device sending data to the bus. receiver the device receiving data from the bus. master the device which controls the bus: initiating transfers (start), generating the clock, and terminating transfers (stop). slave the device addressed by the master. start a unique condition signaling the beginning of a transfer indicated by sda falling (highlow) while scl is high. stop a unique condition signaling the end of a trans- fer indicated by sda rising (lowhigh) while scl is high. ack a receiver acknowledges the receipt of each byte with this unique condition. the receiver drives sda low during scl high of the ack clockpulse. the master provides the clock pulse for the ack cycle. busy communication is not possible because the bus is in use. not busy when the bus is idle, both sda and scl will remain high. data valid the state of sda must remain stable during the high period of scl in order for a data bit to be considered valid. sda only changes state while scl is low during normal data transfers (see start and stop conditions). all transfers take place under control of a host, usually a cpu or microcontroller, acting as the master which provides the clock signal for all transfers. the mc74 always operates as a slave. the serial protocol is illustrated in figure 1. all data transfers have two phases; all bytes are transferred msb first. accesses are initiated by a start condition (start), followed by a device address byte and one or more data bytes. the device address byte includes a read/write selection bit. each access must be terminated by a stop condition (stop). a convention called acknowledge (ack) confirms receipt of each byte. note that sda can change only during periods when scl is low (sda changes while scl is high are reserved for start and stop conditions).
mc74 http://onsemi.com 5 figure 1. smbus protocols data s address wr ack 7 bits command data p 8 bits ack ack s address wr ack 7 bits command rd nack 8 bits s address 7 bits ack ack 8 bits p data rd nack s address 7 bits ack 8 bits p slave address command byte: selects data byte: data goes which register you are writing to. into the register set by the command byte. slave address command byte: selects which register you are reading from. slave address: repeated due to change in data flow direction. data byte: reads from the register set by the command byte. data byte: reads data from the register commanded by the last read byte or write s = start condition p = stop condition shaded = slave transmission write byte format read byte format receive byte format 8 bits byte transmission. start condition (start) the mc74 continuously monitors the sda and scl lines for a start condition (a high to low transition of sda while scl is high) and will not respond until this condition is met. address byte immediately following the start condition, the host must transmit the address byte to the mc74. the states of a1 and a0 determine the 7bit smbus address for the mc74. the 7bit address transmitted in the serial bit stream must match for the mc74 to respond with an acknowledge (indicating the mc74 is on the bus and ready to accept data). the eighth bit in the address byte is a readwrite bit. this bit is a 1 for a read operation or 0 for a write operation. during the first phase of any transfer this bit will be set = 0 to indicate that the command byte is being written. acknowledge (ack) acknowledge (ack) provides a positive handshake between the host and the mc74. the host releases sda after transmitting eight bits, then generates a ninth clock cycle to allow the mc74 to pull the sda line low to acknowledge that it successfully received the previous eight bits of data or address. data byte after a successful ack of the address byte, the host must transmit the data byte to be written or clock out the data to be read. (see the appropriate timing diagrams. ) ack will be generated after a successful write of a data byte into the mc74. stop condition (stop) communications must be terminated by a stop condition (a low to high transition of sda while scl is high). the stop condition must be communicated by the transmitter to the mc74. note: refer to timing diagrams for serial bus timing (figure 2).
mc74 http://onsemi.com 6 ab c def g hijklm i low i high t sudata t hdata t su(start) t h(start) t su(stop) t idle scl sda a = start condition b = msb of address clocked into slave c = lsb of address clocked into slave d = r/w bit clocked into slave e = slave pulls sda line low f = acknowledge bit clocked into master g = msb of data clocked into slave h = lsb of data clocked into slave i = slave pulls sda line low j = acknowledge clocked into master k = acknowledge clock pulse l = stop condition, data executed by slave m= new start condition ab c def g hi jk i low i high t sudata t su(start) t h(start) t su(stop) t idle scl sda a = start condition b = msb of address clocked into slave c = lsb of address clocked into slave d = r/w bit clocked into slave e = slave pulls sda line low f = acknowledge bit clocked into master g = msb of data clocked into master h = lsb of data clocked into master i = acknowledge clock pulse j = stop condition k = new start condition smbus write timing diagram smbus read timing diagram figure 2. timing diagrams
mc74 http://onsemi.com 7 register set and programmer's model mc74 command set (smbus read_byte and write_byte) command byte description command code function rtr 00h read temperature (temp) rwcr 01h read/write configuration (config) configuration register (config), 8bits, read/write configuration register (config) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] shdn data rdy reserved bit por function type operation d[7] 0 standby switch read/ write 1 = stand- by, 0 = normal d[6] 0 data ready* read only 1 = ready, 0 = not ready d[5]d[0] 0 reserved always returns zero when read. n/a n/a *data_rdy bit reset at powerup and shdn enable (see below). figure 3. data_rdy, shdn operation logic diagram v dd t conv t conv data_rdy shdn temperature register (temp), 8bits, readonly the binary value (2's complement format) in this register represents temperature of the integrated sensor following a conversion cycle. the registers are automatically updated in an alternating manner. temperature register (temp) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] msb x x x x x x lsb in the temperature data registers, each unit value represents one degree (celsius). the value is in 2'scomplement binary format such that a reading of 0000 0000b corresponds to 0 c. examples of this temperature to binary value relationship are shown in the following table. temperaturetodigital value conversion (temp) actual temperature registered temperature binary hex +130.00 c +127 c 0111 1111 +127.00 c +127 c 0111 1111 +126.50 c +127 c 0111 1111 +25.25 c +25 c 0001 1001 +0.50 c +1 c 0000 0001 +0.25 c 0 c 0000 0000 0.00 c 0 c 0000 0000 -0.25 c 0 c 0000 0000 -0.50 c 0 c 0000 0000 -0.75 c -1 c 1111 1111 -1.00 c -1 c 1111 1111 -25.00 c -25 c 1110 0111 -25.25 c -25 c 1110 0110 -54.75 c -55 c 1100 1001 -55.00 c -55 c 1100 1001 -65.00 c -65 c 1011 1111 register set summary the mc74's register set is summarized below. all registers are 8bits wide. name description por state read write temp internal sensor temperature (2's complement) 0000 0000b* config config register 0000 0000b *note: the temp register immediately will be updated by the a/d converter after the data_rdy bit goes high.
mc74 http://onsemi.com 8 taping form pin 1 user direction of feed component taping orientation for 5l sot23 devices standard reel component orientation for tr suffix device (mark right side up) device marking 5l sot23a package tape width (w) pitch (p) part per full reel diameter 8 mm 4 mm 3000 7 inches tape & reel specifications table
mc74 http://onsemi.com 9 ordering information and device markings device marking (xx) package voltage address shipping mc74a03.3sntr v0 1001 000 mc74a13.3sntr v1 1001 001 mc74a23.3sntr v2 1001 010 mc74a33.3sntr v3 sot 23a 5 33vv 1001 011 3000 units / tape & reel mc74a43.3sntr v4 sot23a5 3.3 v v dd 1001 100 3000 units / ta e & reel mc74a53.3sntr* v5 1001 101 mc74a63.3sntr v6 1001 110 mc74a73.3sntr v7 1001 111 mc74a05.0sntr u0 1001 000 mc74a15.0sntr u1 1001 001 mc74a25.0sntr u2 1001 010 mc74a35.0sntr u3 sot 23a 5 50vv 1001 011 3000 units / ta p e & reel mc74a45.0sntr u4 sot23a5 5.0 v v dd 1001 100 3000 units / tape & reel mc74a55.0sntr* u5 1001 101 mc74a65.0sntr u6 1001 110 mc74a75.0sntr u7 1001 111 mc74a03.3t v0 1001 000 mc74a13.3t v1 1001 001 mc74a23.3t v2 1001 010 mc74a33.3t v3 to 220 5 33vv 1001 011 3000 units / ta p e & reel mc74a43.3t v4 to2205 3.3 v v dd 1001 100 3000 units / tape & reel mc74a53.3t v5 1001 101 mc74a63.3t v6 1001 110 mc74a73.3t v7 1001 111 mc74a05.0t u0 1001 000 mc74a15.0t u1 1001 001 mc74a25.0t u2 1001 010 mc74a35.0t u3 to 220 5 50vv 1001 011 3000 units / ta p e & reel mc74a45.0t u4 to2205 5.0 v v dd 1001 100 3000 units / tape & reel mc74a55.0t* u5 1001 101 mc74a65.0t u6 1001 110 mc74a75.0t u7 1001 111 *default voltages and addresses: contact your on semiconductor sales representative for other voltage and address options. 1 5 xxyw mc74xx?? awlyww 15 xx = specific device code a = assembly location wl, l = wafer lot y = year ww = work week sot23 sn suffix case 1212 to220 t suffix case 314d
mc74 http://onsemi.com 10 package dimensions to220 t suffix case 314d04 issue e q 12345 u k d g a b 5 pl j h l e c m q m 0.356 (0.014) t seating plane t dim min max min max millimeters inches a 0.572 0.613 14.529 15.570 b 0.390 0.415 9.906 10.541 c 0.170 0.180 4.318 4.572 d 0.025 0.038 0.635 0.965 e 0.048 0.055 1.219 1.397 g 0.067 bsc 1.702 bsc h 0.087 0.112 2.210 2.845 j 0.015 0.025 0.381 0.635 k 0.990 1.045 25.146 26.543 l 0.320 0.365 8.128 9.271 q 0.140 0.153 3.556 3.886 u 0.105 0.117 2.667 2.972 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 3. dimension d does not include interconnect bar (dambar) protrusion. dimension d including protrusion shall not exceed 10.92 (0.043) maximum. sot23 sn suffix case 121201 issue o dim min max millimeters a1 0.00 0.10 a2 1.00 1.30 b 0.30 0.50 c 0.10 0.25 d 2.80 3.00 e 2.50 3.10 e1 1.50 1.80 e 0.95 bsc e1 1.90 bsc l l1 0.45 0.75 notes: 1. dimensions are in millimeters. 2. interpret dimensions and tolerances per asme y14.5m, 1994. 3. datum c is a seating plane. a 1 5 23 4 d e1 b l1 e e e1 c m 0.10 c s b s a b 5x a2 a1 s 0.05 c l 0.20 ---
mc74 http://onsemi.com 11 notes
mc74 http://onsemi.com 12 on semiconductor and are trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. atypicalo parameters which may be provided in scill c data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthori zed use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. publication ordering information central/south america: spanish phone : 3033087143 (monfri 8:00am to 5:00pm mst) email : onlitspanish@hibbertco.com tollfree from mexico: dial 018002882872 for access then dial 8662979322 asia/pacific : ldc for on semiconductor asia support phone : 3036752121 (tuefri 9:00am to 1:00pm, hong kong time) toll free from hong kong & singapore: 00180044223781 email : onlitasia@hibbertco.com japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. mc74/d north america literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com fax response line: 3036752167 or 8003443810 toll free usa/canada n. american technical support : 8002829855 toll free usa/canada europe: ldc for on semiconductor european support german phone : (+1) 3033087140 (monfri 2:30pm to 7:00pm cet) email : onlitgerman@hibbertco.com french phone : (+1) 3033087141 (monfri 2:00pm to 7:00pm cet) email : onlitfrench@hibbertco.com english phone : (+1) 3033087142 (monfri 12:00pm to 5:00pm gmt) email : onlit@hibbertco.com european tollfree access*: 0080044223781 *available from germany, france, italy, uk, ireland

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