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monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 1 magalpha ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability key f eatures uv w signals for block c ommutation 1 1 - bit r esolution absolute angle e ncoder 500 khz refresh r ate u ltra - low l atency: 3 s serial interface for data readout and s ettings 10 - b it incremental o utput (a, b, z) built - in linearization for side - s haft m ounting 7.5 ma supply c urrent qfn - 16 3x 3 mm p ackage general description the magalpha ma300 is a magnetic sensor designed to replace the 3 hall switch solutions for 3 - phase block commutation in brushless dc motors. the ic detects the absolute angular position of a permanent magnet, typically a diametrically magnetized cylinder attached to the ro tor. the magalpha is an extremely fast acquisition and processing sensor, allowing accurate angle measurement at speeds from 0 to 120000 rpm away from the axis of rotation (side shaft figure 1 : functional block diagram
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 2 1. specifications table 1 . o perating conditions parameters symbol min typ max unit supply v oltage vdd 3.0 3.3 3.6 v supply c urrent isup 5.7 6.6 8.0 ma supply v oltage for otp f lashing vflash 3.6 3.8 v supply current for otp f lashing (1) iflash 50 100 ma operating t emperature thermal resistor sensor/environment top - 40 40 125 c k/v applied m agnetic f ield b 30 75 150 mt (1) see section 11 for more details about the supply circuit for otp flashing. table 2 . s ensor output specifi cations me asurement conditions: vdd = 3.3v, 50 mt < b < 100 mt, temp = - 40... +125c, unless otherwise noted parameters min typ max unit remark power - up t ime 2 3 ms inl +/ - 0.7 +/ - 1.5 +/ - 2.5 deg output d rift temperature i nduced +/ - 0.005 +/ - 0.008 +/ - 0.05 deg/c magnetic f ield i nduced - 0.005 - 0.01 - 0.025 deg/mt voltage s upply i nduced 0.0007 0.001 0.00 5 deg/mv absolute output - s erial data output l ength 16 16 bit refresh r ate 500 520 550 khz latency 2 3 4 s resolution (3 noise l evel) 10.5 11.0 11.5 bit incremental o utput resolution 256 1024 edge/revol. jitter 10 % of a period hysteresis 0.35 deg digital i/o threshold v oltage high 1.75 v threshold v oltage low 1.05 v ris ing edge slew r ate 0.7 v/ns cl = 50 pf fall ing edge slew r ate maximum sink/source current per pin 0.7 4 v/ns ma cl = 50 pf
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 3 2. timing of the serial interface the data link is a 4 - wire serial bus, co mplying to the serial peripheral interface (spi) usual convention (see t able 3 and table 4 ) .the magalpha sensor operates as slave. during one transmission , a 16 - bit word can be sent simultaneously to the sensor mosi and received from the sensor miso (see fig ure 2) . note that it is possible to receive 24 bits of data (16 bits for the angle and 8 bits for a ti me index). for additional details, refer to the output signals section . figure 2 : spi timing d iagram table 3 . spi specification table 4 . spi standard sclk idle s tate high cpol 1 sclk readout e dge rising cpha 1 cs idle s tate high mode 3 data o rder msb f irst dord 0 table 5 . spi timing parameter description min max unit t idle time between two subsequent transmissions . 20 ns t csl time between cs falling edge and sclk falling edge . 25 ns t sclk sclk period . 40 ns t sclkl low level of sclk signal . 20 ns t sclkh high level of sclk signal . 20 ns t csh time between sclk rising edge and cs rising edge . 25 ns t mosi data input valid to sclk reading edge . 15 ns t miso sclk setting edge to data output valid . 15 ns
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 4 3. registers table 6 . r egister map no register a ddress bit 7 msb bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 lsb hex bin 3 0x3 0011 bct(7:0) 4 0x4 0100 z(11:4) 5 0x5 0101 0 0 ety etx z(3:0) 9 0x9 1001 f7 - f5 f4 f3 - - - table 7 . p rogramming parameter s parameters symbol number of b it s brief d escription see t able bias current trimming bct 8 for side - shaft configuration , reduce the hall device bias current of the x - and/or y - axis. 9 zero s etting z 12 set s the zero position . 1 1 enable trimming x etx 1 when enabled, the x - axis bias current is trimmed by the quantity bct . 1 0 enable trimming y ety 1 when enabled, the y - axis bias current is trimmed by the quantity bct . 1 0 flash r egister n f n 1 flash es the content of register number n .
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 5 4. pin c onfiguration figure 3: qfn - 16 top v iew table 8. p in functions no name function 1 v v (incremental o utput) 2 b b (incremental o utput) 3 z z (incremental o utput) 4 mosi data in (s erial) 5 cs chip select (serial) 6 a a (incremental o utput) 7 miso data out (s erial) 8 gnd ground 9 w w (incremental o utput) 10 n c - 11 n c - 12 sclk clock (s erial) 13 vdd 3.3 v s upply 14 n c - 15 u u (incremental o utput) 16 vflash 3.6 v s upply for otp f lashing
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 6 5. sensor C m agnet m ounting the sensitive volume of the ma300 is con fined in a region less than 100m wide and has multiple , integrated hall d evices. this volume is located both horizontally and vertically (with a precision 50 m in the center of the qfn package) . the sensor detects the angle of th e magnetic field projected in a plane parallel to the upper surface of the package, making the onl y magnetic field that matters, the in - plane component (x a nd y components) in the middle point of the package . figure 4 : end - of - shaft mounting this detectio n mode allows flexibility for t he design of an angular encoder. all the sensor needs is the magnetic vector to lie essentially within the sensor plane with its amplitude between 30 mt and 150 mt. note that the ma300 work s with fields smaller than 30 m t , but the linearity and resolution performance may deviate from the specifications ( see t able 2). the straightforward solution place s the ma300 sensor on the rotation axis of a permanent magnet, i.e., a cylinder diametrically magnetized ( see f ig ure 4) . if the end - of - shaft position is not available, the sensor can be positioned away from the rotation axis of a cylinder or ring magnet (see f igure 5). in this case, the magnetic field angle is no longer directly proportional to the mechanical angle. the ma30 0 can be adjusted to compensate this effect and recover the linear relation between the mechanical angle and the sensor output. with multiple pole pairs, the ma300 indicates multiple rotations for each mechanical turn. f igure 5 : side - shaft mounti n g 6. power s upply d ecoupling for most applications, a single 100 nf bypass capacitor placed close to the supply pins sufficiently decouples t he ma300 from noise from the power supply. if improved decoupling is required, a larger capacitor (10 f) can be added in parallel with the 100 nf capacitor , and/or a resistor (10 ? ) can be added between the supply line and the capacitor node. in any case, make sure that the connection between the ma300 ground and the power su pply ground has low impedance in order to avoid noise transmitted from the ground. vflash must be supplied only when fla shing the memory. otherwise vflash can remain unconnected or grounded (see figure 6) .
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 7 figure 6 : connection for supply d ecoupling 7. sensor f ront - e nd the magnetic field is detected with integrated hal l devices located in the center of the package . the particularity of this sensor is that the angle is measured using the spin axis method , which digitizes directly the direction of the field wit hout any atan computation or a feedback loop based circuit (interpolators, etc.). the spin axis method is base d on phase detection . it requires a sensitive circuitry gene rating a sinusoidal signal with a phase that represents the angle of the magnetic field. the angle is then retrieved by a time - to - digital converter, which counts the time between the zero crossing of the sinusoidal signal and the edge of a constant waveform ( see figure 7). the digitized time is the front - end output . figure 7 : phase d etection m ethod . top : sine w aveform. bottom : clock of time - to - digital c onverter. looking further down the treatment chain, it is crucial that the signal treatment does not add unwanted phase shifts. for this purpose , the magalpha in corporates an architecture that automatically compensates these shifts , resulting in the stability d isplayed in t able 2. in short, the front - end delivers in a straightforward and open - loop manner a digital number proportional to the angle of the ma gnetic field at the rate of 500 khz . side - s haft the default current bi asing of the hall devices is adjus ted by programming to accommodate a low field or compensate non - linearities inherent to side - shaft configurations (see figure 8) .
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 8 figure 8 : hall devices biasing d iagram if the ma300 is mounted in a side - shaft con figura - tion, the relation ship between the field angle and the mechanical angle is no longer directly linear . th is effect is related in that the tange ntial magnetic field is usually smaller than the radial field. we define the field ratio in equation (1) : (1) where and are the maximum radial, respectively , t angential magnetic field (see figure 9 ). figure 9 : side - shaft f ield the ratio k depends on the magnet geometry and the distance to the sensor. the x - axis or y - axis bias current s can be reduced to recover an equal hall sig nal for all angles and therefore suppress the non - linearity. the current red uction is set by the parameter bias current t rimming , bct (7:0), which is an integer from 0 to 255 (see table 9) . for optimum compensation , the radial axis s hould be reduced by the quantity in equation (2) : (2) table 9 . e xample of optimum bct setting bct(7:0) magnet r atio k 0 1 1 1.00 3 128 1. 50 255 3.00 t he dot printed on the package informs whether the radial field is detected by sensor x or y component s (see f igure 10 ) . figure 10 : package top view with x and y a xes first the user must determine which axis must be reduced (see the qualitative field distribution around a ring in f igure 9). for instance, with the arrangement depicted in figure 8, the x - axis should be reduced. then the parameter etx or ety can be set. note that if both etx and ety a re set to 1 , the current bias will be reduced in both directions the same way, i.e. without side - shaft correction (see table 10) . 8. digital signal conditioning
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 9 table 1 0 . etx and et y etx enable t rimming the x - a xis 0 disabled 1 enabled ety enable t rimming the y - a xis digital filtering ad vanced digital filtering improves the resolution without adding latency. the principle is to measure the rotation speed over the last 512 data points ( in addition to the angular position ) to evaluate of the present position with the best possible accuracy. this principle gives a lag - free position at constant speed . zero s etting the zero position of the magalpha ( ), c an be programmed with 12 - bit reso lution. the angle streamed out ( ) is giv en by equation (3) : (3) where is the raw angle out of the front - end. the parameter z(11:0), which is 0 by default, determines ( see t able 18). this setting is valid for all output formats: spi, abz , and uv . 0 disabled 1 enabled table 1 1 . z ero position z(11:0) zero p osition (deg) 0 0 1 0.088 4095 359.912 rotation d irection looking at the magalpha top, the angle increases when the magnetic field rotates clockwise. the ma300 incorporates 3 programmable registers. each register has an 8 bit of memory. when the ma300 is powered up, each of these 3x 8 bit s are set to zero, unless the registe r was previously stored in the one - time p rogrammable (otp) memory. this means that during start - up, the content of the otp memory is copied to the registers. once flashed , the regist er co ntent can no longer be modified . in order to set the content of a register, the user must send a digital stream composed of the 4 - bit register write command (0010), followed by a 4 - bit register address and the 8 - bit value to be sent to the register. the data stream, sent through the mosi wi re, is therefore 16 - bits long : command reg. address msb value lsb 0 0 1 0 o nce the command is sent, it is immediately effective and affect s the next data sent from the magalpha. 9. programming the ma 3 00
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 10 read back the register c ontent it might be helpful to check the content of a register, for instance to verify that the programming was successful. the user must send the register read command ( 0001 ), then the 4 - b it address of the register being test ed. the last 8 bit s of the stream will be ignored. the user can send for instance 0000 0000 : command reg. address msb value lsb 0 0 0 1 x x x x 0 0 0 0 0 0 0 0 the magalpha response is within the same transmission . in the fi rst byte (simultaneo us to the 4 - bit read command and the 4 - bit address), the magalpha sends the 8 msb of the measured angle a(15:8). the second byte is t he content of the register being test ed . after this transmission , the magalpha continue s delivering the usual 16 - bit angles a(15:0) . example to check the content of regist er 4 (0100), which contains 8 msbs of the zero setting, send the data : c ommand reg. address msb v alue lsb 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 simultaneously the magalpha replies: angle o ut msb v alue lsb a(15:12) a(11:8) z(11:4) 10. output s ignals the bit order of the transmitted data is msb first, lsb last. the timing requirements are indi cated in section 3. every 2s , new data is transferred into the output buffer. the master device connected to the magalpha tri ggers the reading by pulling cs down. when a falling edge of the cs signal occurs, the data remains in the output buffer until the cs signal returns to logic 1. when the cs is low, the master can read the data by sending clock pulses with a maximum frequency of 25mhz. there is no min imum frequency or timeout. se e figure 11 for a simple reading of 16 - bit data. figure 1 1 : timing diagram for simple spi r eadout a full reading requires 16 clock pulses. the ma300 delivers: msb lsb a(15:8) a(7:0) if the user needs less resolution ( since the msb is sent first ) , t he y can read the angle by sending less than 16 pulses. for instance , by sending only 8 pulses, the magalpha provides an 8 - bit angle without ambiguity over 360 deg: msb lsb a(15:8) if the master triggers the reading faster than the refresh rate , the magalpha may send the same data point several times . in some applications , it is helpful to kno w how many data updates occur between two successive readout s or if the same data points were read more t han once. for this purpose , the user can read an 8 - bit index attached to the data . this keeps track of the precise time of measurement without the need of precisely controlling the readout time. this index runs from 0 to 255 and is incremented by 1 each ti me the output buffer is
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 11 refreshed. using the index , the user can detect a double reading of the same data (same index), or the user can see how many data points were skipped (see fig ure 12). for reading the 8 - bit index , the master has to send 16 + 8 = 24 clock pulses. figure 12 : timing diagram for spi angle + index r eadout incremental - abz with the abz output , the ma300 emulates a 10 - bit incremental encoder, such as an optical encoder, providing logic pulses in quadrature ( see f igure 13). compared to signal s ignal b is shifted by a quarter of the pulse period. over one revolutio n , s ignal a pulses 256 times; i t makes 256 - 1 024 edges per revolution. s ignal z (zero or index) raises only once per turn, at the zero angle position. figure 1 3 : abz output during r otation block c ommutation - uvw the uvw output emulates the three hall switches usually used for the block commutation of the 3 - phase electric motor. the three logic signals have a du ty cycle of ? and are shifted 60 deg relative to each other (see f igure 14). figure 14 . uvw o utput during r otation
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 12 the one - time programmable (otp) memory permanently store s the content of the programmable registers. the otp memory is made of poly - silicon fuses. by activating the flash command , the conten t of the entire register is stored in the otp memory. the flash command consi sts in setting some bits ( f n , where n is the register number) in register 9. when the bit f n is set, the register n is stored permanently. important: the user ca n flash only one register at a time. it is possible to operate the magalpha without flashing the registers (see fig. 15) . figure 1 5 . circuit for f lashing the burning of the fuses during the flash process is irreversible: o nce a register is flashed , the default values at power up will always be the same. after flashing , the registers content can no longer be modified . flashing p rocedure prior to flashing, it is recommended to test the magalpha with the new settings and verify the performance of the sensor. once satisfied, the use r can proceed with the flashing. flashing: 1. send the parameter to the register, and read back for verification. 2. tie vflash to 3.6 v. note: i t is possible to supply both v dd and vflash with the same 3.6 v source. 3. in register 9, set the bit so it correspondes to the register be ing flashed. 4. untie vflash. then switch off and on and check by reading back the register content. example: s et & flash the zero position at 50 deg note: p ermanently storin g the zero position requires burn ing two registers (4 and 5 ) . permanently storing the zero position : 1. convert into bi nary (within a resolution of 12 bits ). 50 deg is the binary number , 001000111000 ( ? 49.92 deg). 2. store the 8 msb (001 00011) of the zero position in register 4: command reg. address msb value lsb 0 0 1 0 0 1 0 0 0 0 1 0 0 0 1 1 3. read back register 4 : command reg. address msb value lsb 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 if the programming was correct , the magalpha replies with the register 4 content: angle out msb value lsb a(15:12) a(11:8) 0 0 1 0 0 0 1 1 4. s tore the 4 lsb (1000) of the zero position into the 4 lsb of register 5: command reg. address msb value lsb 0 0 1 0 0 1 0 1 0 0 0 0 1 0 0 0 11. otp programming
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 13 5. read back register 5: command reg. address msb value lsb 0 0 0 1 0 1 0 1 0 0 0 0 0 0 0 0 the magalpha returns: angle out msb value lsb a(15:12) a(11:8) 0 0 0 0 1 0 0 0 complete flashing: 1. connect vflash to 3.6 v . 2. flash register 4: command reg. address msb value lsb 0 0 1 0 1 0 0 1 0 0 0 1 0 0 0 0 3. flash register 5: command reg. address msb value lsb 0 0 1 0 1 0 0 1 0 0 1 0 0 0 0 0 4. disconnect vflash from 3.6v . 5. turn the magalpha off and on and read back registers 4 and 5 to verify that the flashing was successfully accomplished (steps 3 & 5 in the permanently storing the zero position section).
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 14 12. typical characteristics measurement conditions: vdd = 3.3 v, temp = 25c, unless otherwise noted . figure 16 : error curve at different magnetic fields. the inl is the maximum value of this c urve figure 1 7 : resolution in b its (3 - s igma) vs . magnetic f ield
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 15 13. package dimensions package : plastic quad flatpack no - lead qfn - 16 3 x3 mm note s : 1. all dimensions are in mm . 2. package dimensions do no t include mold flash, prot r usions, burrs , or metal smearing . 3. coplanarity shall be 0.08 . 4. compliant with jedec mo - 220 .
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 16 14. ordering information part number package free air temperature ( t a ) ma 3 00gq qfn 3 mm x3mm - 40 to 125 * for tape & reel, add suffix C z ( e. g. ma 3 00gq C z).
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 17 appendix a: d efinitions resolution (3 the smallest angle increment distinguishable from the noise. here the resolution is defined as 3 times , the standard deviation in degrees, taken over 1000 data points at a constant position. the resolution in bits is obtained with: . refresh rate rate at which new data points are stored in the output buffer. latency the time between when the data is ready at the output , and the instant at which the shaft passes that position. the lag in degrees is , where is the angular velocity in deg/s. power - up t ime starting at power - up, the time until the sensor delivers valid data. integral non - linearity (inl) maximum deviation between the sensor output and the best line fit (see figure a1) . figure a 1 : absolute angle e rrors jitter for the incremental output maximum fluctuation of the angular position of the raising edges. overall r eproducibility maximum variation between two readings, successive or not, of the same shaft position at a fixed magnetic field over the complete temperature range. 0 50 100 150 200 250 300 350 400 0 100 200 300 400 500 600 700 sensor out (deg) rotor position (deg) resolution ( 3 ? ) ideal sensor output inl lag sensor out best straight fit
ma 3 00 angular sensor for 3 - phase brushless motor commutation and position control with side - shaft positioning capability monolithic power systems, inc. | gland, switzerland | tel: +41 22 364 63 50 | euroinfo@monolithicpower.com | www.sensimatech.com mps proprietary information. unauthorized photocopy and duplication prohibited. ? 2014 monolithic power systems . all rights reserved. ma700 rev 1.0 september 2014 18 monolithic power systems, inc. switzerland www.sensimatech.com euroinfo@monolithicpower.com ? +41 22 364 63 50 the information provided by monolithic power systems, inc. in this document is believed to be cor rect. however mps reserves the right, without further notice, (i) to change the product specification and/or the information in this document and (ii) to improve reliability, functions , and design of the product and (iii) to discontinue or limit production or distribution of any product version. monolithic power systems, inc. does not assume any liability arising out of any application or use of any produc t or information, including without limitation consequential or incidental damages. all operating parameters must be validated for each custome r's application by customer's technical experts. recommended parameters can and do vary in different applications . dev ices sold by mps are covered by patents and patent applications. by thi s publication mps does not assume responsibility for patent infringements or other rights of third parties which may result from its use.

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