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mlx90326 analog 0-5v sensor interface ic 3901090326 page 1 of 13 data sheet rev 002 feb/12 features and benefits analog 0-5v ratiometric output single pin programming (through output) fast response time extended temperature range cost effective ?electronic trimming? second order compensation of offset and gain internal temperature sensor provided application examples pressure transducers, strain gauges, accelerometers, position sensors, etc? industrial sensors automotive after market sensors all resistive bridge sensors ordering code product code temperature code package code op tion code packing form code mlx90326lfr l fr aaa-000 tu mlx90326lfr l fr aaa -000 re legend : temperature code: l for temperature range -40c to 150c package code: fr for ssop 209 mil option code: xxx-000: standard version packing form: re for reel, tu for tube ordering example: mlx90326lfr-aaa-000-tu 1 functional diagram 2 general description the mlx90326 covers the most typical resistive type of wheatstone bridge applications for use in an industrial or automotive after market environment. it is a monolithic silicon analog integrated sensor interface that converts small changes in resistors, configured in a full wheatstone bridge on a sensing element, to large output voltage variations. the signal conditioning includes gain adjustment, offset control and second order temperature compensation in order to accommodate variations of the different resistive sensing elements. compensation values are stored in eeprom and can be reprogrammed with an interface circuit and a provided software. the mlx90326 is programmed with a single wire serial interface through the output pin.
mlx90326 analog 0-5v sensor interface ic 3901090326 page 2 of 13 data sheet rev 002 feb/12 table of contents 1 functional diagram .............................. ................................................... .......................... 1 2 general description ............................. ................................................... .......................... 1 3 absolute maximum ratings ........................ ................................................... ................... 3 4 pin definitions and descriptions ................ ................................................... .................... 4 5 general electrical specifications ............... ................................................... ..................... 5 6 general description ............................. ................................................... .......................... 7 7 unique features ................................. ................................................... ........................... 7 8 application information ......................... ................................................... ......................... 8 8.1 ratio-metric mode with external temperature sen sor. .............................................. ... 8 8.2 ratio-metric mode with no external temperature sensor. ........................................... . 9 8.3 non ratio-metric mode with external temperature sensor. ......................................... 9 8.4 non ratio-metric mode with no external temperat ure sensor. .................................. 10 9 standard information regarding manufacturability of melexis products with different soldering processes ............................... ................................................... ......................... 11 10 esd precautions ................................ ................................................... ........................ 11 11 package information ............................ ................................................... ...................... 12 12 disclaimer ..................................... ................................................... ............................. 13
mlx90326 analog 0-5v sensor interface ic 3901090326 page 3 of 13 data sheet rev 002 feb/12 3 absolute maximum ratings parameter. min max units comments supplyvoltage,v dd v ss 4.5 5.5 v operatingwithinspecifications operatingtemperaturerange,t environment 40 150 oc storagetemperaturerange 50 150 c programmingtemperaturerange 40 125 c packagethermalresistance 130 c/w esdsensitivity 2 kv hbm. cdfaecq100002 table 1: absolute maximum ratings exceeding the absolute maximum ratings may cause pe rmanent damage. exposure to absolute-maximum- rated conditions for extended periods may affect de vice reliability.
mlx90326 analog 0-5v sensor interface ic 3901090326 page 4 of 13 data sheet rev 002 feb/12 4 pin definitions and descriptions package pin nr short name dir type function / description 1 inm in analog bridgesensornegative 2 anagnd gnd analogground 3 inp in analog bridgesensorpositive 4 sub gnd substrateground 5 tmp in temp externaltemperaturesensor(resist ortosupply) 6 diggnd gnd digitalground 7 test nc onmoduletoground. 8 testou t out test testoutput. onmoduletoground 9 testin1 in test testinput1:clkext,test(3l evel) 10 testin2 in test testinput2:datain,scan(3 level) 11 flt out analog filterpin 12 out bi analog analogoutputandcommunication pin 13 test nc onmoduletoground 14 vdd power supply supply table 2: pin definitions and descriptions
mlx90326 analog 0-5v sensor interface ic 3901090326 page 5 of 13 data sheet rev 002 feb/12 5 general electrical specifications dc operating parameters t a = -40 o c to 150 o c, v dd = 5.0v (unless otherwise specified) parameter. symbol comments min typ max units supplyvoltage vdd 4.5 5.5 v supplycurrent idd nooutputload, v dd =5v 10% 4 9 ma output capacitiveload 10 mlx90326 analog 0-5v sensor interface ic 3901090326 page 6 of 13 data sheet rev 002 feb/12 typicalsensor offsetthatcan becompensated 97.2 mv/v supply outputoffset programmable 10 90 %v dd outputoffset resolution 0.1 %v dd overallnon linearity bestfitvalue 0.1 %v dd wakeuptimeat powerup 10 ms outputnoise 47nfflt capacitancewith maximumgain 5 mv rms responsetime setbyan external capacitor 0.1 ms table 3: electrical specifications
mlx90326 analog 0-5v sensor interface ic 3901090326 page 7 of 13 data sheet rev 002 feb/12 6 general description the mlx90326 can be used with almost any type of re sistive bridge sensor without the need of any additional signal conditioning. the differential input signal is offset compensated and amplified to achieve the desired output voltag e. with a coarse gain calibration the mlx90326 can easily acc ommodate sensor output spans in the 1.8mv/v to 63mv/v range to achieve 4 v output span. sensor out put offsets up to 97.2mv/v (depending on the sensor output span and on the desired output offset) can b e compensated with the coarse offset calibration to achieve an output offset in the 0.5v to 4.5v range. 7 unique features offset canceling the offset of amplifier dido is cancelled by using a chopping mechanism. also the amplifier dts and all sample-and-hold circuits make use of an offset canceling mechanism. this means that the contribution of the on-chip offsets and of fset drifts is negligible compared to the external sensor offset and offset drift. coarse and fine second order calibration of the sen sitivity and offset. the mlx90326 can be calibrated to achieve 4v output span for a sensor output span in the 1.8mv/v to 63mv/v and can compensate 0.4mv/v to 97.2mv/v input offset depending on the sensor output span and on the desired mlx90326 output offset voltage. a wide range of sensor sensitivity and offset temperature drift can be compensated with the second order fine gain and offset calibration. eeprom all the calibration data is stored three times on a n eeprom and a majority voting is done when accessi ng data. parity check is used to diagnose data corrupt ion. after all calibrations parameters were success fully written to eeprom, the eeprom can be locked by send ing a ?lock eeprom? command (see paragraph 6). this is strongly recommended to avoid in applicatio n mode data corruption. for reliability reasons, ac tually each calibration bit is stored three times in the e eprom and the circuit uses a hardware majority voti ng system when accessing data.
mlx90326 analog 0-5v sensor interface ic 3901090326 page 8 of 13 data sheet rev 002 feb/12 8 application information 8.1 ratio-metric mode with external temperature sen sor. the external temperature sensor is only needed for applications where the temperature surrounding the customer sensor is different from the temperature s urrounding the mlx90326. in the ratio-metric applic ation mode, to keep the accuracy, the same supply should be used for the customer sensor, the mlx90326 and a n adc that makes the digital conversion of the analog output signal. the c1 capacitor value (output) is typically 47nf. range: 0 ? 100nf. the capacitor c2 on the flt pin is optional. typica l value = 10nf. range: 0 ? 100nf. it is used to dec rease the noise and set the bandwidth of the system. the decoupling capacitors c3 between the supply and the ground and c4 between output and supply have a typi cal value of 47nf. the external resistor r1 is placed between the tmp pin and the supply. it is used as an external tempe rature sensor. the external temperature sensor could be of type panasonic, eras15j103v (r1 = 10k +/- 5%, tcr = 1500ppm/degc +/- 200ppm/degc) for the -40oc to 14 0oc temperature range. typical pull up resistor r2 value is 2.4kohm. vdd
mlx90326 analog 0-5v sensor interface ic 3901090326 page 9 of 13 data sheet rev 002 feb/12 8.2 ratio-metric mode with no external temperature sensor. vdd 12 3 4 5 6 7 14 13 12 11 8 9 10 inm inp vdd out flt c2 c1 c3 r2 c4 c1, c2, c3, c4 and r2 have the same values as for t he ratio-metric application with use of external temperature sensor. the internal temperature sensor can be used when th e temperature surrounding the customer sensor and the mlx90326 is the same. 8.3 non ratio-metric mode with external temperature sensor. vdd 12 3 4 5 6 7 14 13 12 11 8 9 10 inm inp vdd out flt c2 c1 vdd r1 lm7805 vbat c3 c4 r2 with the use of an external voltage regulator to su pply the sensor, the mlx90326 as well as an adc use d for converting the analog output signal, the mlx90326 c an be used in a non ratio-metric mode. an example o f
mlx90326 analog 0-5v sensor interface ic 3901090326 page 10 of 13 data sheet rev 002 feb/12 standard voltage regulator is the lm7805. c1, c2, r 1 and r2 are the same as in the ratio-metric applic ation mode. c4 has a typical value of 330nf and c3 of 100 nf in this application mode. 8.4 non ratio-metric mode with no external temperat ure sensor. vdd 12 3 4 5 6 7 14 13 12 11 8 9 10 inm inp vdd out flt c2 c1 lm7805 vbat c3 c4 r2 in this application mode the lm7805 generates the s upply for the sensor, for the mlx90326 and for an a dc used to convert the analog output signal in a digit al value. c1, c2, c3, c4 and r2 are the same as in the non ratio-metric application mode with external tempera ture sensor.
mlx90326 analog 0-5v sensor interface ic 3901090326 page 11 of 13 data sheet rev 002 feb/12 9 standard information regarding manufacturability of melexis products with different soldering processes our products are classified and qualified regarding soldering technology, solderability and moisture s ensitivity level according to following test methods: reflow soldering smd?s (s urface m ount d evices) ? ipc/jedec j-std-020 moisture/reflow sensitivity classification for nonh ermetic solid state surface mount devices (classification reflow profiles according to table 5-2) ? eia/jedec jesd22-a113 preconditioning of nonhermetic surface mount device s prior to reliability testing (reflow profiles according to table 2) wave soldering smd?s (s urface m ount d evices) and thd?s (t hrough h ole d evices) ? en60749-20 resistance of plastic- encapsulated smd?s to combin ed effect of moisture and soldering heat ? eia/jedec jesd22-b106 and en60749-15 resistance to soldering temperature for through-hol e mounted devices iron soldering thd?s (t hrough h ole d evices) ? en60749-15 resistance to soldering temperature for through-hol e mounted devices solderability smd?s (s urface m ount d evices) and thd?s (t hrough h ole d evices) ? eia/jedec jesd22-b102 and en60749-21 solderability for all soldering technologies deviating from above mentioned standard conditions (regarding peak temperature, temperature gradient, temperature prof ile etc) additional classification and qualificatio n tests have to be agreed upon with melexis. the application of wave soldering for smd?s is allo wed only after consulting melexis regarding assuran ce of adhesive strength between device and board. melexis is contributing to global environmental con servation by promoting lead free solutions. for more information on qualifications of rohs compliant products (rohs = european directive on t he restriction of the use of certain hazardous substances) please vis it the quality page on our website: http://www.melexis.com/quality.aspx 10 esd precautions electronic semiconductor products are sensitive to electro static discharge (esd). always observe electro static discharge control pro cedures whenever handling semiconductor products.
mlx90326 analog 0-5v sensor interface ic 3901090326 page 12 of 13 data sheet rev 002 feb/12 11 package information
mlx90326 analog 0-5v sensor interface ic 3901090326 page 13 of 13 data sheet rev 002 feb/12 12 disclaimer devices sold by melexis are covered by the warranty and patent indemnification provisions appearing in its term of sale. melexis makes no warranty, express, s tatutory, implied, or by description regarding the information set forth herein or regarding the freed om of the described devices from patent infringemen t. melexis reserves the right to change specifications and prices at any time and without notice. therefo re, prior to designing this product into a system, it is nece ssary to check with melexis for current information . this product is intended for use in normal commercial ap plications. applications requiring extended tempera ture range, unusual environmental requirements, or high reliability applications, such as military, medical life- support or life-sustaining equipment are specifical ly not recommended without additional processing by melexis for each application. the information furnished by melexis is believed to be correct and accurate. however, melexis shall no t be liable to recipient or any third party for any dama ges, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequ ential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the t echnical data herein. no obligation or liability to recipien t or any third party shall arise or flow out of mel exis? rendering of technical or other services. ? 2012 melexis nv. all rights reserved. for the latest version of this document, go to our website at www.melexis.com or for additional information contact melexis direc t: europe, africa, asia: america: phone: +32 1367 0495 phone: +1 248 306 5400 e-mail: sales_europe@melexis.com e-mail: sales_usa @melexis.com iso/ts 16949 and iso14001 certified

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