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revision 1.6 www.austriamicrosystems.com page 1 of 13 1 general description the as5304/as5306 are singlechip ics with integra ted hall elements for measuring linear or rotary motion using multipole magnetic strips or rings. this allows the usage of the as5304/as5306 in applications where the sensor ic cannot be mounted at the end of a rotating device (e.g. at hollow shafts). i nstead, the as5304/as5306 are mounted offaxis underneath a mul ti pole magnetized ring or strip and provides a quadra ture incremental output with 40 pulses per pole period a t speeds of up to 20 meters/sec (as5304) or 12 meters /sec (as5306). a single index pulse is generated once for every po le pair at the index output. using, for example, a 32polepair magnetic ring, th e as5304/as5306 can provide a resolution of 1280 pulses/rev, which is equivalent to 5120 positions/r ev or 12.3bit. the maximum speed at this configuration is 9375 rpm. the pole pair length is 4mm (2mm north pole / 2mm s outh pole) for the as5304, and 2.4mm (1.2mm north pole / 1.2mm south pole) for the as5306. the chip accepts a magnetic field strength down to 5mt (peak). both chips are available with pushpull outputs (as530xa) or with open drain outputs (as530xb) . the as5304/as5306 are available in a small 20pin tssop package and specified for an operating ambien t temperature of 40 to +125c. figure 1: as5304 (as5306) with multipole ring magn et. 2 benefits complete systemonchip high reliability due to noncontact sensing suitable for the use in harsh environments robust against external magnetic stray fields 3 key features high speed, up to 20m/s (as5304) 12m/s (as5306) magnetic pole pair length: 4mm (as5304) or 2.4mm (as5306) resolution: 25m (as5304) or 15m (as5306) 40 pulses / 160 positions per magnetic period. 1 index pulse per pole pair linear movement measurement using multipole magnetic strips circular offaxis movement measurement using multi pole magnetic rings 4.5 to 5.5v operating voltage magnetic field strength indicator, magnetic field a larm for endofstrip or missing magnet 4 applications the as5304/as5306 are ideal for high speed linear m otion and offaxis rotation measurement in applications s uch as electrical motors xystages rotation knobs industrial drives figure 2: as5306 (as5304) with magnetic multipole strip magnet for linear motion measurement as5 3 0 4 / as5306 integrated hall ics for linear and offaxis rotary motion detection preliminary data sheet
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 2 of 13 5 functional description the as5304/as5306 require a multipole magnetic str ip or ring with a pole length of 2mm (4mm pole pair length) on the as5304, and a pole length of 1.2mm (2.4mm pole pair length) on the as5306. the magnetic field strength of the multipole magnet should be in the range of 5 to 60mt at the c hip surface. the hall elements on the as5304/as5306 are arranged in a linear array. by moving the multipole magnet over the hall array , a sinusoidal signal (sin) is generated internally . with proper configuration of the hall elements, a second 90 phase shifted si nusoidal signal (cos) is obtained. using an interpo lation circuit, the length of a pole pair is divided into 160 positions and fu rther decoded into 40 quadrature pulses. an automatic gain control provides a large dynamic input range of the magnetic field. an analog output pin (ao) provides an analog voltag e that changes with the strength of the magnetic fi eld (see chapter 8). figure 3: as5304 / as5306 block diagram 6 sensor placement in package tssop20 / 0.65mm pin pitch 0.22990.100 0.23410.100 0.77010.150 package outline 3.04750.235 3.2000.235 die c/l 1 11 1 . .. . 0 00 0 2 22 2 figure 4: sensor in package die tilt tolerance 1o
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 3 of 13 6.1 pin description pin pin name pin type notes 1 vss s supply ground 2 a do_od incremental quadrature position output a. short cir cuit current limitation 3 vddp s peripheral supply pin, connect to vdd 4 b do_od incremental quadrature position output b. short cir cuit current limitation 5,12,13, 14,17,18,19 test aio test pins, must be left open 6 ao ao agc analogue output. (used to detect low magnetic f ield strength) 7 vdd s positive supply pin 8 index do_od index output, active high. short circuit current li mitation 9,10,11 test aio test pins, must be left open 15 test_gnd s test pin, must be connected to vss 16 vdda hall s hall bias supply support (connected to vdd) 20 zpzmskdis di test input, connect to vss during operation pin types: s supply pin ao analogue output aio analog input / output di digital input do_od digital output push pull or open drain (prog rammable) 6.2 package drawings and markings 20 lead thin shrink small outline package C tssop20
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 4 of 13 dimensions mm inch symbol min typ max min typ max a 1. 2 0 0 .0 47 a1 0.05 0.15 0 .002 0 .006 a2 0.8 0 1.00 1.05 0.03 1 0.03 9 0.0 41 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0 .004 0 .008 d 6.40 6.50 6.60 0.252 0.256 0.260 e 6. 4 0 0.252 e1 4.3 0 4.4 0 4. 50 0.169 0.173 0.17 7 e 0.65 0 .0256 k 0 8 0 8 l 0. 45 0.60 0.75 0 .01 8 0 .024 0 .030 6.3 electrical connection the supply pins vdd, vddp and vdda are connected to +5v. pins vss and test_gnd are connected to the su pply ground. a 100nf decoupling capacitor close to the device is r ecommended. figure 5: electrical connection of the as5304/as530 6 marking: aywwizz a: pbfree identifier y: last digit of manufacturing year ww: manufacturing week i: plant identifier zz: traceability code jedec package outline standard: mo-153-ac thermal resistance r th(ja) : 89 k/w in still air, soldered on pcb. ic's marked with a white dot or the letters "es" de note engineering samples
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 5 of 13 7 incremental quadrature ab output the digital output is compatible to optical increme ntal encoder outputs. direction of rotation is encoded i nto two signals a and b that are phaseshifted by 90o. depending on the direction of rotation, a leads b (cw) or b leads a (ccw). 7.1.1 index pulse a single index pulse is generated once for every po le pair. one pole pair is interpolated to 40 quadratur e pulses (160 steps), so one index pulse is generated after every 40 quadrature pulses (see figure 6) the index output is switched to index = high, when a magnet is placed over the hall array as shown in figure 7, top graph: the north pole of the magnet i s placed over the left side of the ic (top view, pin# 1 at bottom left) and the south pole is placed over the right side of the ic. the index output will switch back to index = low, when the magnet is moved by one lsb from position x=0 to x=x1, as shown in figure 7, bottom graph. one lsb is 25m for as5304 and 15m for as5306. note: since the small step size of 1 lsb is hardly recognizable in a correctly scaled graph it is show n as an exaggerated step in the bottom graph of figure 7 . figure 6: quadrature a / b and index output 7.1.2 magnetic field warning indicator the as5304 can also provide a low magnetic field wa rning to indicate a missing magnet or when the end of the magnetic strip has been reached. this condition is indicated by us ing a combination of a, b and index, that does not occur in normal operation: a low magnetic field is indicated with: index = high a=b=low 7.1.3 vertical distance between magnet and ic the recommended vertical distance between magnet an d ic depends on the strength of the magnet and the length of the magnetic pole. typically, the vertical distance between magnet and chip surface should not exceed ? of the pole lengt h. that means for as5304, having a pole length of 2.0m m, the maximum vertical gap should be 1.0mm, for the as5306, having a pole length of 1.2mm, the maximum vertical gap should be 0.6mm these figures refer to the chip surface. given a ty pical distance of 0.2mm between chip surface and ic package surface, the recommended vertical distances between magnet and ic surface are therefore: as 5304: 0.8mm as 5306: 0.4mm n 40 1 2 a 40 1 2 40 1 2 b 40 1 2 index s s n s a 157 b index detail: step # 158 159 0 1 2 3 4 5
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 6 of 13 3.04750.235 4.2200.235 hall array center line magnet drawn at index position x=0 cw magnet movement direction pin 1 chip top view 3.04750.235 4.2200.235 hall array center line magnet drawn at position x1 (exaggerated) cw magnet movement direction pin 1 chip top view x=x1 x=0 x x=0 x 25m (as5304) 15m (as5306) index = high index = low n s n s figure 7: magnet placement for index pulse generati on 7.1.4 soft stop feature for linear movement measurement when using long multipole strips, it may often be necessary to start from a defined home (or zero) po sition and obtain absolute position information by counting the steps from the defined home position. the as5304/as5306 provide a soft stop feature that eliminates the need for a separate electromechanic al home position switch or an optical light barrier switch to indicate the home position. the magnetic field warning indicator (see 7.1.2) to gether with the index pulse can be used to indicate a unique home position on a magnetic strip: 1. first the as5304/as5306 move to the end of the stri p, until a magnetic field warning is displayed (ind ex = high, a=b=low) 2. then, the as5304/as5306 move back towards the strip until the first index position is reached (note: a n index position is generated once for every pole pair, it is indica ted with: index = high, a=b= high). depending on th e polarity of the strip magnet, the first index position may be gener ated when the end of the magnet strip only covers o ne half of the hall array. this position is not recommended as a d efined home position, as the accuracy of the as5304 /as5306 are reduced as long as the multipole strip does not fu lly cover the hall array.
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 7 of 13 as5306 systematic linearity error caused by pole length deviation 0 20 40 60 80 100 120 140 900 1000 1100 1200 1300 1400 1500 pole length [ m] error [m] error [m] as5304 systematic linearity error caused by pole length deviation 0 20 40 60 80 100 120 140 1500 1700 1900 2100 2300 2500 pole length [ m] error [m] error [m] 3. it is therefore recommended to continue to the next (second) index position from the end of the strip (index = high, a=b= high). this position can now be used as a defi ned home position. 7.2 incremental hysteresis if the magnet is sitting right at the transition po int between two steps, the noise in the system may cause the incremental outpu ts to jitter back and forth between these two steps, especially when the magnetic field is weak. to avoid this unwanted jitter, a hysteresis has bee n implemented. the hysteresis lies between 1 and 2 lsb, depending on d evice scattering. figure 8 shows an example of 1lsb hysteresis: the h orizontal axis is the lateral position of the magnet as it scans across t he ic, the vertical axis is the change of the incremental outputs, as they s tep forward (blue line) with movement in +x direction and backward (red lin e) in Cx direction. note: 1lsb = 25m for as5304, 15m for as5306 figure 8: hysteresis of the incremental output 7.3 integral nonlinearity (inl) the inl (integral nonlinearity) is the deviation b etween indicated position and actual position. it i s better than 1lsb for both as5304 and as5306, assuming an ideal magnet. pole l ength variations and imperfections of the magnet ma terial, which lead to a nonsinusoidal magnetic field will attribute to a dditional linearity errors. 7.3.1 error caused by pole length variations figure 9 and figure 10 show the error caused by a n onideal pole length of the multipole strip or ring. this is less of an issue with strip magnets, as the y can be manufactured exactly to specification using the pro per magnetization tooling. figure 9: additional error caused by pole length va riation: as5304 however, when using a ring magnet (see figure 1) th e pole length differs depending on the measurement radius. for optimum performance it is therefore essential to mo unt the ic such that the hall sensors are exactly underneat h the magnet at the radius where the pole length is 2.0mm (as5304) or 1.2mm (as5306), see also 8.1.2. note that this is an additional error, which must b e added to the intrinsic errors inl (see 7.3) and dnl (see 7.4 ). figure 10: additional error caused by pole length v ariation: as5306 m agnet position h ys teres is: 1 ls b x + 2 i ncrem en tal o ut put mov ement d ir ection: +x m ovem ent direc tion: - x x + 4 x x x + 1 x + 3 x+1 x+2 x+ 3 x+4
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 8 of 13 7.4 dynamic nonlinearity (dnl) the dnl (dynamic nonlinearity) describes the nonl inearity of the incremental outputs from one step t o the next. in an ideal system, every change of the incremental outputs wou ld occur after exactly one lsb (e.g. 25m on as5304 ). in practice however, this step size is not ideal, the output st ate will change after 1lsb +/dnl. the dnl must be <+/ ? lsb to avoid a missing code. consequently, the incremental outputs will change when the magnet movement over the ic i s minimum 0.5 lsb and maximum 1.5 lsbs. 1 1 1 1 lsb lsb lsb lsb + + + + dnl dnl dnl dnl 1 1 1 1 lsb lsb lsb lsb dnl dnl dnl dnl 1 1 1 1 lsb lsb lsb lsb lateral magnet movement lateral magnet movement lateral magnet movement lateral magnet movement i i i i n n n n c c c c r r r r e e e e m m m m e e e e n n n n t t t t a a a a l l l l o o o o u u u u t t t t p p p p u u u u t t t t s s s s t t t t e e e e p p p p s s s s 37 3737 37. .. .5 5 5 5 m mm m 25 25 25 25 m mm m 12 1212 12. .. .5 5 5 5 m mm m as asas as5304 5304 5304 5304: :: : dnl dnl dnl dnl ( (( (dynamic non dynamic non dynamic non dynamic non linearity linearity linearity linearity) )) ) 1 1 1 1 lsb lsb lsb lsb + + + + dnl dnl dnl dnl 1 1 1 1 lsb lsb lsb lsb dnl dnl dnl dnl 1 1 1 1 lsb lsb lsb lsb lateral magnet movement lateral magnet movement lateral magnet movement lateral magnet movement i i i i n n n n c c c c r r r r e e e e m m m m e e e e n n n n t t t t a a a a l l l l o o o o u u u u t t t t p p p p u u u u t t t t s s s s t t t t e e e e p p p p s s s s 22 2222 22. .. .5 5 5 5 m mm m 15 15 15 15 m mm m 7 77 7. .. .5 5 5 5 m mm m as asas as5306 5306 5306 5306: :: : dnl dnl dnl dnl ( (( (dynamic non dynamic non dynamic non dynamic non linearity linearity linearity linearity) )) ) figure 11: dnl of as5304 (left) and as5306 (right) 8 the ao output the analog output (ao) provides an analog output vo ltage that represents the automatic gain control (a gc) of the hall sensors signal control loop. this voltage can be used to monitor the magnetic fi eld strength and hence the gap between magnet and c hip surface: short distance between magnet and ic strong magn etic field low loop gain low ao voltage long distance between magnet and ic weak magneti c field high loop gain high ao voltage for ideal operation, the ao voltage should be betwe en 1.0 and 4.0v (typical; see 9.5). figure 12: ao output versus agc, magnetic field str ength, magnettoic gap
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 9 of 13 8.1 resolution and maximum rotating speed when using the as5304/as5306 in an offaxis rotary application, a multipole ring magnet must be used. resolution, diameter and maximum speed depend on the number of pole pair s on the ring. 8.1.1 resolution the angular resolution increases linearly with the number of pole pairs. one pole pair has a resolutio n (= interpolation factor) of 160 steps or 40 quadrature pulses. resolution [steps] = [interpolation factor] x [number of pole pairs] resolution [bit] = log (resolution[steps]) / log (2) example: multipole ring with 22 pole pairs resolution = 160x22 = 3520 steps per revolution = 40x22 = 880 quadrature pulses / revolution = 11.78 bits per revolution = 0.1023 per step 8.1.2 multipole ring diameter the length of a pole pair across the median of the multipole ring must remain fixed at either 4mm (as 5304) or 2.4mm (as5306). hence, with increasing pole pair count, t he diameter increases linearly with the number of p ole pairs on the magnetic ring. magnetic ring diameter = [pole length] * [number of pole pairs] / for as5304: d = 4.0mm * number of pole pairs / for as5306: d = 2.4mm * number of pole pairs / example: same as above: multipole ring with 22 pol e pairs for as5304 ring diameter = 4 * 22 / 3.14 = 28.01mm (this numb er represents the median diameter of the ring, this is where the hall elements of the as5304/as5306 should be placed ; see figure 4) for the as5306, the same ring would have a diameter of: 2.4 * 22 / 3.14 = 16.8mm 8.1.3 maximum rotation speed the as5304/as5306 use a fast interpolation techniqu e allowing an input frequency of 5khz. this means, it can process magnetic field changes in the order of 5000 pole pa irs per second or 300,000 revolutions per minute. h owever, since a magnetic ring consists of more than one pole pair, the above figure must be divided by the number of pole pairs to get the maximum rotation speed: maximum rotation speed = 300,000 rpm / [number of pole pairs] example: same as above: multipole ring with 22 pol e pairs: max. speed = 300,000 / 22 = 13,636 rpm (this is in dependent of the pole length) 8.1.4 maximum linear travelling speed for linear motion sensing, a multipole strip using equally spaced north and south poles is used. the pole length is again fixed at 2.0mm for the as5304 and 1.2mm for the as5306. a s shown in 8.1.3 above, the sensors can process up to 5000 pole pairs per second, so the maximum travelling speed is: maximum linear travelling speed = 5000 * [pole pair length] example: linear multipole strip: max. linear travelling speed = 4mm * 5000 1/sec = 20,000mm/sec = 20m/sec for as5304 max. linear travelling speed = 2.4mm * 5000 1/sec = 12,000mm/sec = 12m/sec for as5306
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 10 of 13 9 general device specifications 9.1 absolute maximum ratings (non operating) stresses beyond those listed under absolute maximu m ratings may cause permanent damage to the device . parameter symbol min max unit note supply vdd 0.3 7 v input pin voltage v in vss0.5 vdd+0.5 v input current (latchup immunity) i scr 100 100 ma norm: jesd78 esd +/2 kv norm: mil 883 e method 3015 package thermal resistance ja 114.5 c /w still air / single layer pcb storage temperature t strg 55 150 c soldering conditions t body 260 c norm: ipc/jedec jstd020c humidity noncondensing 5 85 % 9.2 operating conditions parameter symbol min typ max unit note positive supply voltage avdd digital supply voltage dvdd 4.5 5.0 5.5 v negative supply voltage vss 0.0 0.0 0.0 v power supply current, as5304 25 35 power supply current, as5306 idd 20 30 ma a/b/index, ao unloaded! ambient temperature t amb 40 125 c junction temperature t j 40 150 c 25 as5304 resolution lsb 15 m as5306 integral nonlinearity inl 1 lsb ideal input signal (errmax errmin) / 2 differential nonlinearity dnl 0.5 lsb no missing pulses. optimum alignment hysteresis hyst 1 1.5 2 lsb 9.3 system parameters parameter symbol min max unit note power up time t pwrup 500 s amplitude within valid range / interpolator locked, a b index enabled propagation delay t prop 20 s time between change of input signal to output signal
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 11 of 13 9.4 a / b / c push/pull or open drain output push pull mode is set for as530xa, open drain mode is set for as530xb versions. parameter symbol min typ max unit note high level output voltage v oh 0.8 vdd v push/pull mode low level output voltage v ol 0.4 + vss v current source capability i loh 12 14 ma push/pull mode current sink capability i lol 13 15 ma short circuit limitation current i short 25 39 ma reduces maximum operating temperature capacitive load c l 20 pf see figure 13 load resistance r l 820 see figure 13 rise time t r 1.2 s push/pull mode fall time t f 1.2 s r l = 820 ttl 74ls00 c l = 20pf a/b/index from as5304/6 vdd = 5v figure 13: typical digital load 9.5 cao analogue output buffer parameter symbol min typ max unit note minimum output voltage v outrange 0.5 1 1.2 v strong field, min. agc maximum output voltage v outrange 3.45 4 4.3 v weak field, max. agc offset v offs 10 mv current sink / source capability i l 5 ma average short circuit current i short 6 40 ma reduces maximum operating temperature capacitive load c l 10 pf bandwidth bw 5 khz
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 12 of 13 9.6 magnetic input parameter symbol min typ max unit note 2.0 as5304 magnetic pole length l p_fp 1.2 mm as5306 4.0 as5304 magnetic pole pair length t fp 2.4 mm as5306 magnetic amplitude a mag 5 60 mt operating dynamic input range 1:12 1:24 magnetic offset off mag 0.5 mt magnetic temperature drift t dmag 0.2 %/k input frequency f mag 0 5 khz table 1: as5304 ordering guide device resolution magnet pole length digital outputs as5304a 25m 2mm push pull as5304b 25m 2mm open drain table 2: as5306 ordering guide device resolution magnet pole length digital outputs AS5306A 15m 1.2mm push pull as5306b 15m 1.2mm open drain
as5304/as5306 integrated hall ic for linear and off axis rotary motion detection revision 1.6 www.austriamicrosystems.com page 13 of 13 contact headquarters austriamicrosystems ag a 8141 schloss premst?tten, austria phone: +43 3136 500 0 fax: +43 3136 525 01 www.austriamicrosystems.com copyright devices sold by austriamicrosystems are covered by the warranty and patent indemnification provisions appearing in its term of sale. austriamicrosystems makes no warranty, expres s, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described de vices from patent infringement. austriamicrosystems reserves the right to change specifications and prices at any time and wi thout notice. therefore, prior to designing this pr oduct into a system, it is necessary to check with austriamicrosystems for cur rent information. this product is intended for use in normal commercial applications. copyright ? 2008 austriamicrosystems. trademarks re gistered ?. all rights reserved. the material herei n may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copy right owner. to the best of its knowledge, austriamicrosystems asserts that the information contained in this publication is accur ate and correct. however, austriamicrosystems shall not be liable to recipien t or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of u se, interruption of business or indirect, special, incidental or consequential 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 recipient or any third p arty shall arise or flow out of austriamicrosystems rendering of technical or other services.

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