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mlx90215 position programmable linear hall effect sensor 3901090215 page 1 of 14 rev 008 nov/12 features and benefits programmable linear hall ic quad switched / chopper stabilized ratiometric output for a/d interface adjustable quiescent voltage (v oq ) very low quiescent voltage temperature drift adjustable sensitivity adjustable temperature compensation of sensitivity application examples rotary position sensor linear position sensor current sensing ordering code product code temperature code package code option code packing form code mlx90215 e va aaa-106 bu mlx90215 l va aaa-111 bu legend: temp. code: e for temperature range: -40c to +85c l for temperature range: -40c to +150c package code: va for plastic single in line thickness 1.5mm- 1.6m m packing form code: bu for bulk ordering example: mlx90215eva-aaa-106-bu
mlx90215 position programmable linear hall effect sensor 3901090215 page 2 of 14 rev 008 nov/12 1 functional diagram
mlx90215 position programmable linear hall effect sensor 3901090215 page 3 of 14 rev 008 nov/12 2 description the mlx90215 is a programmable linear hall effect s ensor ic fabricated utilizing silicon-cmos technology. it possesses active error correction circuitry whic h virtually eliminates the offset errors normally a ssociated with analog hall effect devices. all magnetic respo nse functions of the mlx90215 are fully programmabl e for even greater versatility. the voq (vout@ b=0), sensitivity, direction of slope and the magnitude o f sensitivity drift over temperature, are all program mable. the ratiometric output voltage is proportion al to the supply voltage. when using the supply voltage as a reference for an a/d converter, fluctuations of 10 % in supply voltage will not affect accuracy. when progr ammed for a conventional sensitivity (with a positi ve gain), the voltage at the output will increase as a south magnetic field is applied to the branded fac e of the mlx90215. conversely, the voltage output will decrease in the presence of a north magnetic field. the mlx90215 h as a sensitivity drift of less than +1% error, and voq s tability drift of less than +0.4% error, over a bro ad temperature range. 3 electrical specifications dc operating parameters t a = -40 o c to 150 o c, v dd = 5.0v (unless otherwise specified)
mlx90215 position programmable linear hall effect sensor 3901090215 page 4 of 14 rev 008 nov/12 notes: (1) if output current and voltage specifications ar e exceeded, linearity will be degraded. (2) if v oq is programmed beyond these limits, the temperature compensation may become a problem at high temperatures. it is not recommended to program valu es of v oq below 1v or above 4v when sensitivity exceeds 100 mv/mt. temperature instability can occur on some de vices under these conditions. (3) bandwidth is related to the sample rate and rou ghgain. bandwidth is estimated by (sample rate / 30 ) (4) peak to peak noise is a function of roughgain s etting. see page 5, peak to peak noise versus sensi tivity. (5) sensitivity drift is independent of other param eters and does not include individual tolerances ( ? v oq or ? v oq / ? t ). the tolerance for sensitivity 1% of its initial va lue. this does not include tolerance stack-up. (6) if the step input occurs in the middle of a sam ple interval, the small signal response delay will double. for roughgain values less than or equal to 3, response time may be limited by the slew rate. (7) 1 mt = 10 gauss melexis inc. reserves the right to make changes wit hout further notice to any products herein to impro ve reliability, function, or design. melexis does n ot assume any liability arising from the use of any pr oduct or application of any product or circuit desc ribed herein. 4 how does it work? the mlx90215 programming is done through the output pin, by changing supply voltage levels. please note that the v dd is raised to approximately 13v and 18v during progr amming. any connected components must also tolerate this voltage excursion. when the supply voltage is at 4.5v to 5.5v, the out put behaves normally. if the supply voltage is raised to 13v, t he output then behaves as an input, or load mode, allowing the 37-bit word to be clocked in. all data is loaded through a single line, with no dedicated clock signal. clock and data are integrated into one sign al which is initiated with the beginning of the loa d sequence, then clocked with the positive edge of ea ch bit. variables are changed with the pc software and loaded into the temporary register of the device (r am) via the timings of the programmer?s microcontro ller. data can be loaded as many times as desired while i n load mode. once a word is loaded, results are checked by observing the output voltage. this can b e done with an external voltmeter attached directly to pin 4 of the device, or with the internal adc of the pr ogrammer. once the desired program is loaded, the word can be ?zapped? permanently into rom. this is done when the supply voltage rises above 18v, or zap mode, creating enough current to ?zap? 31 ze ner diodes which correspond to the temporary register. the zap function is a one-time function a nd cannot be erased. the above description is only for reference. the voltage levels and data transfer rates are complete ly controlled by the asic programmer. for more info rmation on the programmer hardware, contact melexis and request a datasheet for the sdap programmer. programming the quiescent offset voltage (v oq ) 10 bits, 1024 steps of resolution, are allotted to adjust the quiescent offset voltage (v oq ). by utilizing the halfvdd function, the v oq can be set to one of two ranges. with the halfvdd function disabled, the v oq can be programmed within a range of 10% to 90% v dd with about 5mv per step resolution. with the halfvdd function enabled, the device may be programmed within a 2v to 3v window with less than 1mv per step resolution. programming the sensitivity (gain) the sensitivity is programmed with a roughgain and a finegain adjustment. the roughgain is adjusted by utilizing three bits, or 8 increments. the finegain is programmed with 10 bits or 1024 increments. the sensitivity can be programmed withi n a range of 5mv/mt to 140mv/mt. another 1-bit func tion allows the direction of the sensitivity to be rever sed. the invertslope function, when activated, will cause the voltage output of the mlx90215 to decreas e in the presence of a south magnetic field, and to increase in the presence of a north magnetic field. table 2 expresses examples of sensitivity resultin g from programming rough gain and fine gain codes, with th e invert slope function turned off. note: tables 1 and 2 are examples how various codes affec t the device. output voltage will vary slightly fro m device to device. use these tables for reference only.
mlx90215 position programmable linear hall effect sensor 3901090215 page 5 of 14 rev 008 nov/12 temperature compensation temperature compensation (tc) is defined as thechan ge in sensitivity over temperature. expressed in (parts per million per degree celcius) ppm/ o c. sens t1 = sensitivity measured at temperature 1 (t1) sens t2 = sensitivity measured at temperature 2 (t2) sens 25 = initial sensitivity measured at 25 o c programming the temperature compensation the mlx90215 has a 5-bit (32 step) programmable adj ustment that changes it?s sensitivity drift over a given temperature range. by adjusting the tc code the sen sitivity can be programmed to increase as temperature increases to counteract the decrease in magnetic flux most magnets display over temperatur e. for example a smco (samarium cobalt) magnet has a t emperature coefficient of approximately -300 ppm/ o c. the mlx90215 can be programmed with a tc of 300 ppm / o c to counteract the tc of the magnet and greatly improve linearity in the application over temperatu re.
mlx90215 position programmable linear hall effect sensor 3901090215 page 6 of 14 rev 008 nov/12 table 3 (left) illustrates the way the tc code affects the sensitivity temperature drift. also note in table 3 , the overlap in tc codes. the numbers in the table repre sent typical results and are for reference only. for acc urate results the tc code must be determined experimental ly. this tc code map applies to mlx90215?s with a first line brand showing ?215db? special note the mlx90215 programmed with a zero tc code (default) has a typical tc value between the range of ? 300 to ?600 ppm/ o c. this means sensitivity will decrease slightly as temperature increases. the sli ghtly negative initial tc value allows the mlx90215 to be accurately programmed up to 0 tc. almost all magnet s have a naturally negative tc code. the natural tc o f a magnet added with the initial negative tc value of the mlx90215 could degrade linearity over a large temperature span. using a tc code of 6, 7, or 8 wil l give the mlx90215 a slightly positive tc code. previous revisions of the mlx90215 with second line brand of ?15axx? or ?15dxx? should refer to factory for tc code maps. diagnostic characteristics
mlx90215 position programmable linear hall effect sensor 3901090215 page 7 of 14 rev 008 nov/12 5 mlx90215 performance
mlx90215 position programmable linear hall effect sensor 3901090215 page 8 of 14 rev 008 nov/12 6 melexis programmer melexis offers a programmer (ptc-01) for programmin g the mlx90215. the ptc-01 comes complete with windows based software that makes pro gramming the mlx90215 simple. the programmer communicates with a pc via a rs232 serial interface . the programmer and software allows users to load settings in the mlx90215, take measurements, calibr ate sensors, and program the mlx90215. for more information the ptc-01 goto www.melexis.com, o r contact melexis. left , ptc-01 windows based software. works with any 9 pin serial port equipped pc running windows 9x,w2000 or xp. melexis ptc-01 programmer
mlx90215 position programmable linear hall effect sensor 3901090215 page 9 of 14 rev 008 nov/12 7 absolute maximum ratings
mlx90215 position programmable linear hall effect sensor 3901090215 page 10 of 14 rev 008 nov/12 8 clamping the output voltage bit allocation t able the mlx90215 has a 2-bit clamp feature which allows four output voltage options. the clamp feature is independent of the gain, and will not effect sensitivity of the device. the table below illustrates limits for each of the four options. bit value limits (% v dd ) 0 (default) no clamp 1 5 to 45 2 10 to 90 3 5 to 95 9 application comments the following is a list of recommended operating parameters that will help to ensure the accuracy an d stability of the mlx90215. these are not the absolu te programming limits of the device. 1.) voq is best programmed in the absence of any magnetic influence and to voltages closest to 1/2 v dd , where temperature drift will be +/-0.4% or less. it is not recommended to use v oq values close to 0 volts or v dd when programming extremely high sensitivity (> 100 mv/mt) values. temperature instability may be observed on some devices under these conditions. 2.) best linearity of sensitivity is obtained when v oq i s programmed at 1/2v dd . this is with the 1/2v dd function enabled. 3.) best linearity of sensitivity is obtained when the gain is programmed between 5mv/mt and 100mv/mt. 4.) best temperature stability is realized when the temperature compensation function is programmed to zero ppm/ o c. 5.) the test/readback pin is for diagnostic use onl y. this pin is normally tied to gnd. contact melexis for more details on programming this device. 10 installation comments 1.) avoid mechanical stress on leads or package. stress may cause v oq shift. a.) avoid bending leads at the package interface. b.) support the leads by clamping, when bending. c.) avoid gluing device to another material. this may cause temperature-related stress. 2.) cmos products are static sensitive devices, ple ase observe esd precautions. 3.) observe temperature limits during soldering
mlx90215 position programmable linear hall effect sensor 3901090215 page 11 of 14 rev 008 nov/12 11 physical characteristics
mlx90215 position programmable linear hall effect sensor 3901090215 page 12 of 14 rev 008 nov/12 12 application notes linear precision current sensor the programmable gain, offset, and temperature compensation of mlx90215 allows great flexiblity in the design of a current sensor. current flowing through a conductor can produce a proportional magnet field. the mlx90215 can then produce an output voltage proportional to the curre nt. using the programmable gain and offset function the output of the mlx90215 can be adjusted to sense a wide range of current allowing for a flexible desig n. slotted torroid example assuming infinite permeabilty of the core, the magnetic field through the air gap produced by a single wire turn is given by equation 2 equation 2 where: i = current in amperes b = magnetic field in tesla l g = length of air gap in meters u o = permeability of free space (4 10 -7 h/m) this equation is a close estimate for the field in the air gap, but does not take into account magnetic losses in the core, fringing effects, and mechanical toleranc es of the air gap. the programmable mlx90215 can be adjusted to compensate for these errors simplifying the design. the temperature compensation of mlx90215 can also be adjusted to counteract temperature loss es of core. for sensing a current 100a, with an air gap of 2mm equation 2 yields a magnetic field range of 63mt. the output range of the mlx90215 is 0.5v to 4.5v (4v fu ll scale). equations 3a and 3b yield a sensitivity of 32mv/ mt and a v oq of 2.5v. magnetic suppliers: elna ferrites technologies inc eastern components fair rite products corp equation 3 a) s = 4000mv/ 126mt b) voq = 4v/2 + 0.5v the resulting gain of the current sensor is 20mv/a with an offset of 2.5v. for best results it is recommend that mlx90215 be programmed with a voq of 50% vdd 1/2 vdd bit set.
mlx90215 position programmable linear hall effect sensor 3901090215 page 13 of 14 rev 008 nov/12 13 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 recommends reviewing on our web site the ge neral guidelines soldering recommendation ( http://www.melexis.com/quality_soldering.aspx ) as well as trim&form recommendations (http://www.melexis.com/assets/trim-and-form-recomm endations-5565.aspx). melexis is contributing to global environmental con servation by promoting lead free solutions. for mor e information on qualifications of rohs compliant pro ducts (rohs = european directive on the restriction of the use of certain hazardous substances) please vis it the quality page on our website: http://www.melexis.com/quality.aspx
mlx90215 position programmable linear hall effect sensor 3901090215 page 14 of 14 rev 008 nov/12 14 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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