3901090217 page 1 jun/04 rev. 009 MLX90217 hall-effect cam sensor description the MLX90217 is a self adjusting digital output rotary position gear tooth sensor designed for use in automotive camshaft sensing as well as other speed sensing applications. it is designed to be used with a bias magnet south facing the back (non-marked) side of the ic. the device has an open collector output which is short circuit protected. the MLX90217 is a sophisticated ic featuring an on-chip 10-bit a/d converter and logic that acts as a digital sample and hold circuit. a separate 4- bit a/d converter provides a fixed hysteresis. the 90217 does not have a chopper delay. the 90217 uses a single hall plate which is immune to rotary alignment problems. the bias magnet can be from 50 to 400mt. as the signal is sampled, the logic recognizes an increasing or decreasing flux density. the output will turn on (bop) after the flux has reached its peak and decreased by an amount equal to the hysteresis. similarly the output will turn off (bop ) after the flux has reached its minimum value and increased by an amount equal to the hysteresis . functional diagram pin 1 - v dd (supply) pin 2 - v ss (ground) pin 3 - output amplifier voltage regulator adc adc logic protected output 1 2 3 hall plate 10-bit 4-bit features and benefits n rotary position gear tooth sensor n short circuit protection n on-chip 10 bit a/d converter n self-adjusting magnetic range n high speed operation n no chopper delay n zero speed detection n no rotary orientation concerns applications n camshaft sensor n geartooth sensor n linear encoder n rotary encoder n direction detection* *see applications example ordering information part no. temperature suffix package code MLX90217 l (-40 o c to 150 o c) ua (to-92 flat) note: static sensitive device, please observe esd precautions.
3901090217 page 2 jun/04 rev. 009 MLX90217 hall-effect cam sensor j MLX90217 electrical specifications dc operating parameters t a = -40 o c to 150 o c, v dd = 3.5v to 24v (unless otherwise specified). parameter symbol test conditions min typ max units supply voltage v dd operating 3.5 - 24 v supply current i dd v dd = 12v 1.5 3.0 4.5 ma supply current i dd v dd = 3.5v to 24v 1 - 6 ma leakage current i leak v out = 3.5v to 24v - - 10 m a output current i out operating - - 25 ma output saturation voltage v sat v dd = 12v, i out = 25ma - - 600 mv output short circuit current i fault fault 50 100 150 ma output short circuit shutdown t fault fault 100 - 200 m s clock frequency f clk operating 300 500 800 khz output rise time t r v dd =12v r 1 = 880w c 1 = 20pf - 400 ns output fall time t f v dd =12v r 1 = 880w c 1 = 20pf - 400 ns bandwidth bw operating - - 15 khz thermal resistance r th operating - - 200 o c/watt MLX90217 magnetic specifications dc operating parameters t a = -40 o c to 150 o c, v dd = 3.5v to 24v (unless otherwise specified) parameter symbol test conditions min typ max units back bias range b bias operating -30 - 400 mt linear region v dd = 12v 50 - 500 mt hysteresis b hys v dd = 3.5v to 24v 1.8 3.5 10 mt notes: 1 mt = 10 gauss
3901090217 page 3 jun/04 rev. 009 MLX90217 hall-effect cam sensor performance graphs absolute maximum ratings supply voltage (operating), v dd 30v supply current (fault), i dd 50ma output current (fault), i out 30ma output current (fault), i fault 50ma output voltage, v out 30v power dissipation, p d 100mw operating temperature range, t a - 40c to 150c storage temperature range, t s - 65c to 150c maximun junction temp, t j 175c
3901090217 page 4 jun/04 rev. 009 MLX90217 hall-effect cam sensor j application notes maximum dynamic range is 500 mt. the hysteresis is fixed at 5.0 mt. best angular accuracy will be obtained when the magnetic circuit provides peak magnetic flux at the chip near the high end of the linear range of 500 mt. emc protection using external components are recommended. two possibilities are shown on the following page. normally the south pole faces the unbranded side of the device. a north pole will enable a test sequence used in factory testing. unique features the output is reset to the high state at power on (output driver is off) whatever the field is. the output only changes after the first min is detected . the reset state holds no information about the field. if the supply of the chip is raised slowly, the reset state is not stable. this has been observed at 0 field but it should be the same with small and large fields. gear tooth sensors often need to be adjusted after the module is assembled to align the magnet with differential hall plates or orient with teeth. however the MLX90217 is self adjusting over a wide range of back bias flux eliminating the need for any trimming in the application. the magnet may be glued to the back surface (non branded side) of the ic using a cyanoacrylate adhesive or suitable epoxy.
3901090217 page 5 jun/04 rev. 009 MLX90217 hall-effect cam sensor applications examples
3901090217 page 6 jun/04 rev. 009 MLX90217 hall-effect cam sensor j physical characteristics
3901090217 page 7 jun/04 rev. 009 MLX90217 hall-effect cam sensor this melexis device is classified and qualified reg arding soldering technology, solderability and moisture sensitivity level, as defined in this spec ification, according to following test methods: n ipc/jedec j-std-020 moisture/reflow sensitivity classification for nonh ermetic solid state surface mount de- vices (classification reflow profiles accor ding to table 5-2) n eia/jedec jesd22-a113 preconditioning of nonhermetic surface mount device s prior to reliability testing (reflow profiles according to table 2) n cecc00802 standard method for the specification of surface mo unting components (smds) of assessed quality n eia/jedec jesd22-b106 resistance to soldering temperature for through-hol e mounted devices n en60749-15 resistance to soldering temperature for through-hol e mounted devices n mil 883 method 2003 / eia/jedec jesd22-b102 solderability for all soldering technologies deviating from abov e mentioned standard conditions (regarding peak temperature, temperature gradient, temperature profile etc) additional classifica- tion and qualification tests have to be agreed upon with melexis. the application of wave soldering for smds is all owed only after consulting melexis re- garding assurance of adhesive strength between dev ice and board. based on melexis commitment to environmental respo nsibility, european legislation (directive on the restriction of the use of certain hazardous substances, rohs) and customer requests, melexis has installed a roadmap to qualif y their package families for lead free proc- esses also. various lead free generic qualifications are runnin g, current results on request. for more information on manufacturability/solderab ility see quality page at our website: http://www.melexis.com/html/pdf/mlxleadfree-stateme nt.pdf esd procautions electronic semiconductor products are sensitive to electro static discharge (esd). always observe electro static discharge control pro cedures whenever handling semiconductor products. reliability information
3901090217 page 8 jun/04 rev. 009 MLX90217 hall-effect cam sensor j devices sold by melexis are covered by the warranty and patent indemnification provisions appear- ing in its term of sale. melexis makes no warranty, express, statutory, implied, or by description re- garding the information set forth herein or regardi ng the freedom of the described devices from pat- ent infringement. melexis reserves the right to cha nge specifications and prices at any time and with- out notice. therefore, prior to designing this prod uct into a system, it is necessary to check with melexis for current information. this product is in tended for use in normal commercial applications. applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are spec ifi- cally 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 not be liable to recipient or any third party for a ny damages, including but not limited to personal i n- jury, property damage, loss of profits, loss of use , interrupt of business or indirect, special incide ntal or consequential damages, of any kind, in connectio n with or arising out of the furnishing, perform- ance or use of the technical data herein. no obliga tion or liability to recipient or any third party s hall arise or flow out of melexis rendering of technica l or other services. ? 2002 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 and japan: all other locations: phone: +32 13 67 04 95 phone: +1 603 223 2362 e-mail: sales_europe@melexis.com e-mail: sales_usa @melexis.com iso/ts16949 and iso14001 certified disclaimer
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