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ada4571r - ebz user guide ug - 739 one technology way ? p. o . box 9106 ? norwood, ma 02062 - 9106, u.s.a. ? tel: 781.329.4700 ? fax: 781.461.3113 ? www.analog.com ada4571 end of shaft evaluation board features usb 2.0 interface jumper for temperature compensation mode enable jumper for power down mode enable measurement test points and coaxial connectors evaluation kit conte nts ad a4571 magnetic stimulus : dipole magnet brushed or b rushless dc motor with integrated control electronics evaluation software cd - rom ( windows ? 7 32 - bit and 64 - bit compatible gui ) additional equipment needed customer supplied 6 v to 12 v bench supply sdp in terface board usb cable (supplied with sdp interface board) general description the end of shaft evaluation syst em is composed of a windows labview? gui software, an ada4571 moth erboard, a magnetic stimulus mounted on top of a brushless dc motor, a daughter board with ada4571 in its soic package , and a usb interface and controller board, the sdp - s. the mot herboard features an on - board 5 v regulator, a 2 - channel simultaneous sampling adc and jumpers for enabling the tem perature compensation and power - down modes within the ada4571 . the motherboard also features test points and unpopulated coaxial connectors for the three outputs of the device. the daughter board features the ada4571 mounted above the magnetic s timulus as well as test points for the three outputs of the device. the sdp board is used to control the adc on the motherboard and interface with the gui. evaluation board con nection diagram usb pc gui inter f ace sd p contro l card e v alu a tion system with magnetic stimulus power supp l y 6v t o 12v supp l y 12526-001 figure 1. ada4571 end of shaft evaluation system please see the last page for an important warning and legal terms and conditions . rev. 0 | page 1 of 13
ug- 739 ada4571r- ebz user gui de table of contents features .............................................................................................. 1 evaluation k it contents ................................................................... 1 additional equipment needed ....................................................... 1 general description ......................................................................... 1 evaluation board connection diagram ........................................ 1 revision history ............................................................................... 2 getting started .................................................................................. 3 software installation procedures ................................................ 3 evaluation board hardware .............................................................4 jumper configuration ..................................................................4 dut outputs .................................................................................4 how to use the software ..................................................................5 starting up the evaluation gui ..................................................5 overview of the main gui window ..........................................6 evaluation board schematics and artwork ................................ 12 related links ................................................................................... 13 revision history 10/1 4 revision 0: initial version rev. 0 | page 2 of 13
ada4571r- ebz user guide ug- 739 getting started s oftware installation procedu res there are two pieces of software t o install: the windows gui and the sdp drivers. windows gui installation use the f ollow ing steps to install the gui. 1. before connecting the usb cable or powering the board, insert the a da4571 - eb z setup cd and from the installer directory , run the installer se tup.exe . 2. when the destination directory screen appears ( see figure 2 ), click next . optionally, you may change the destination folder by clicking browse , select ing a different destination folder, and click ing next . figure 2. choose destination location 3. when the start installation window appears click next to continue with the installation (see figure 3 ) . figure 3. review installation 4. click next to compl ete installation of the windows labview gui. sdp installation next , install th e a nalog d evices, inc., sdp d river . this driver allow s the sdp control board to interface with the labview gui. 1. when the sdp drivers setup wizard appears , click next (see figure 4 ) . figure 4. sdp driver installation 2. when the choose install location screen appears ( see figure 5 ), click next . optionally, you may change the destination folder by clicking browse , select ing a different destination folder, and click ing next . figure 5. choose install location 3. click finish to complete the installation of the sdp drivers. 4. connect the sdp c ontrol car d to the motherboard and plug the sd p control card in to the pc with the supplied usb cable. the computer now recognize s the sdp control board and the labview gui may be opened to continue. rev. 0 | page 3 of 13
ug- 739 ada4571r- ebz user gui de evaluation board har dware the ada4571 end of shaft demo evaluation system comprises of two boards ( ada4571 motherboard and ada4571 daughter board) and a brushless dc motor. the ada4571 evaluation system can be powered directly from the host pc usb or from an external bench supply. for maximum performance, it i s recommended that an external bench power supply be used. when supplied directly from the host pc usb, the applied voltage is approximately 5 v. however, due to errors in the regulated usb voltage this value will vary and introduce extra errors into the system. to power the motherboar d by an external bench supply, apply 6 v to 12 v to p7, the red terminal. when supplied by an external b ench supply, the applied voltage is regulated to 5 v on the motherboard resulting in a better performance than powering directly from the host pc usb. if the bench supply features current - limiting, it is recommended to set the current limit to 100 ma, as a precaution . to power the motor by an external bench supply, 3 v to 9 v can be applied to p6, the blue terminal. the g round is shared with the ground of the motherboard. the speed of the brushless dc motor providing the magnetic stimulus to the ada4571 is proportional to the voltage applied at this terminal. the attached motor provide s a more constant rotational speed at lower applied voltages. due to the labview gui measuring the linearity of the outputs from the device, a more constant rotational speed is necessary to see the true performance of t he ada4571 . see the angular error (linearity) section for more information on motor performance. jumper c onfiguration refer to the ada4571 motherboard schematic ( see figure 15) or the configuration panel to understand the purpose of each jumper. configure the m otherboard default jumper as fo llows (see figure 15): ? install the p9 and p 10 jumper s in the standard position to connect the motor and board power to the external supply terminals. ? install the p3 jumper connecting gc to vdd . this enable s the ga in control mode of the part. when p3 connects gc to gnd , g ain control mode is disabled. ? install the p2 jumper connecting pd to g nd. this disable s the power - down mode of the part. when p2 connects pd to vdd, power - down mode is enabled and the ada4571 outputs are p ut into a high impedance state. dut o utputs the outputs o f the ada4571 may be monitored at the tes t points located on the daughter board or the motherboard. the vsin , vcos , and vtemp pins are all accessible on both of the boards. rev. 0 | page 4 of 13
ada4571r- ebz user guide ug- 739 how to use the software starting u p the evaluation gui for maximum performance when the evaluation board is first powe red up, control both the motor and the board using an external bench power supply. the jumper settings fo r p9 and p10 should be set for ext motor and ext +5v as indicated on the board. plug t he positive supply for the board into the red terminal, p7, on th e motherboard. this terminal requires 6 v to 12 v which is then regulated to 5 v on the motherboard using the on - board ADP3336 . thi s supply powers both the on - board adc, ad7866 , as well as the daughter board containing the ada4571 . plug t he positive supply for the motor into the blue terminal, p6, on the mot herboard. due to mechanical non linearities of the dc motor, such as cogging durin g coil commuting, extra errors are intro duced to the system at higher rotational vel ocities. for b est performance, apply 3 v to ext motor terminal. if the motor supplied is a brushless dc motor; 3 v result s in rotational speeds of approximately 2 ,000 rpm. speeds up to 10 ,000 rpm are possible wit h a supply voltage of 12 v applied to this terminal. if the motor supplied is a brushed dc motor , 3 v results in rotational speeds of approximately 200 rpm. t he non idealities of the motor result in a higher reported non linearity of the device. this is an artifact of the motor and not the ada4571 . with an ideal magnetic stimulus, the ada4571 has the same angu lar error performance regardless of rotational velocity. rev. 0 | page 5 of 13
ug- 739 ada4571r- ebz user gui de overview of the main gui window figure 6 shows the m ain gui window, as it appears, after launching the gui. when the program is first launched the sdp con troller board must be recognized by the gui before pr oceeding. pressing connect sdp read s the eeprom id of the motherboard to ensure the correct program is being used. if the sdp controller board is not connected or if the drivers are not installed correct ly an error message will be shown. e nsure that the drivers are installed correctly if this occurs. after the sdp control board is properly connected and the program recognizes the motherboard , the instructions tab appears. click the read tab to begin. ini tially all of the figures will be blank. to begin press run (see figure 6 ) . the various output graphs are explained in detail in the following sections . there are two different categories of output waveforms as in dicated by the gui. the waveforms on the top of each tab, indicated as uncorrected plots , are without any post processing to correct for output off set bef ore calculations are done on the raw data. in the case of the bottom waveforms, indicated as offset co rrected plots , the offset of each channel is subtracted from the raw data before completing any further calculations. these differences are discussed in further detail for each waveform in the raw waveforms section . figure 6. ada4571 main window rev. 0 | page 6 of 13
ada4571r- ebz user guide ug- 739 raw waveforms the first figure is labeled raw waveforms (see figure 11) . this figure shows the sampled adc raw data as the motor is spinning. the amplitude is shown in 12 - bit code. the dual channel ad7866 simultaneously samples the sine and cosine channels at 100 ,000 samples per second. the inter nal 2.5 v reference of the ad7866 has been subtracted in hardware as the read out of the adc is in twos comple ment. therefore, the two signals are centered around zero in the raw waveform plo t. the magnetic stimulus is sampled over many rotations and then cropped to three mechanical revolutions or six electrical revolutions. it is important that these two channels are simultaneously sampled or extra errors will be introduced from the phase d elay between the sampling of the individual channels. figure 7. raw sine and cosine waveform there are two different figures shown depicting these sine and cosine waveforms. the uncorrected figure has not had any post processing applied and shows the absolute raw data from the sensor. for the offset corrected figure, the full three mechanical revolutions are averaged independently for both the sine and cosine channels giving the offset for the channel. these offset values are the n subtracted from their respective channel to give the end waveform centered perfectly about zero. note that w hen powering the board through a usb instead of by an external power supply there will be some variation in the supply voltage of the ada4571 . due to the r eadout of the ad7866 being in two s comple ment form with respect to the internal 2.5 v reference, the offse t of these waveforms will be higher than the inherent offset of the ada4571 . arc tangent2 (magnetic angle) the second set of figures are labeled arctangent ( magnetic angle ) (see figure 8 ) . these figures depict the calculated electrical angle of the ada4571 . this calculation is performed by the following equation: angle = arc tangent2 ( v sin / v cos ) because the two amr bridges are deposited at a 45 relative angle, the sine and cosine outputs are 90 out of phase. this constant 90 phase difference results in the calculated angle over a constant rotary speed as a straight line. n ormally the arctangent function will have a range of ( ? 90 to + 90 ). however, if quadrant information is kept and cor - rected for after the calculation the second and third quadrant can be distinguished from the first and fourth. the function arctangent2 h as this quadrant information and there fore the range is extended to ( ? 180 to + 180 ) . the program then zeros this waveform and therefore shows the angle between (0 and 360 ). figure 8 . arctangent calculation plot the electrical angle period will repeat for every sinusoidal period of the sine and cosine outputs from the ada4571 . just like the raw waveform data, three mechanical revolutions or six electrica l revolutions are used for calculations. this results in six periods of angle information shown. the uncorrected arctangent (magnetic angle) plot will have a slight bowed shape to it due to the sensor offset in the raw waveform. the offset corrected arct angent (magnetic angle) plot shows the angle information after the offset is nulled from each individual channel. this offset correction to the raw waveforms before the arctangent calculation result s in a much more linear output plot. rev. 0 | page 7 of 13
ug- 739 ada4571r- ebz user gui de angular error ( linearity) there are two different motors that may be supplied with your demo board: a brushless dc motor or a brushed dc motor . the brushed dc motor will introduce extra errors into the system due to coggin g of the motor during rotation. to fully evaluate the performance of the sensor, an externally applied magnetic stimulus that has a smoother rotational velocity should be used with the supplied labview gui. the third set of figures are labeled angular error (degrees) (see figure 6 ) . this figure shows the linearity of the arctangent plot discussed in the arc tangent2 (magnetic angle) section. there is no encoder attached to the magnetic stimulus on the board and therefore the program cannot compare the c alculated angle to the actual position of the magnet. therefore, this plot is calculating the linearity of both the ada4571 and the brushless dc motor providing the magnetic stimulu s. due to the nonidealities of the brushless dc motor providing the magnetic stimulus, the reported angular error will always be higher than the actual error of the ada4571 . the motor provides a more constant rate of speed at lower rotational velocities and therefore the reported linearity will be lower at slower speeds. these extra errors are not indicative of the bandwidth of the ada4571 as the part can handle motor rotational speeds as high as 50 ,000 rpm. figure 9 shows the uncorrected angular error (degrees) plot. when powered by the host pc usb supply this waveform report s hi gher error than when powered by an external supply. this increased error is because the internal 2.5 v reference is subtracted in hardware from each adc channel resulting in a higher inherent offset of the sensor if the supply voltage is not exactly 5 v. w hen powered by an external power source the ada4571 supply is regulated to 5 v and, therefore, the adc introduces no extra offset or errors to the system. figure 9. uncorrected linearity error plot figure 10 sh ows the offset corrected error (degrees) p lot. large spikes appear in this plo t due to the nonidealities of the magnetic stimulus. when the motor commutes, there is a kick from the excitation coils resulting in a higher reported linearity erro r at these points. the sensor measur es the position of the magnetic stimulus and so these k icks during commuting will show up as an error from an ideal linear plot. this nonideality from the magnetic stimulus is more prevalent at higher speeds but is not a result of the sensor. the included motor is very smooth at lower speeds and, therefore, th ese spikes will not appear in the error plot. figure 10 . offset corrected linearity error plot rev. 0 | page 8 of 13
ada4571r- ebz user guide ug- 739 fourier transform the fourth set of figures are labeled fourier transform . these figures show the spectral analysis of the two indep endent output signals. the fundamental frequency correspond s to the motor speed. harmonics from the sensor are also depicted in this plot. the y - axis of this plot shows the magnitude of the frequency components. this value is the root mean squared (rms) , m agnitude in 12 - bit code of that specific frequency. the x - axis is shown i n hertz . the fundamental frequency shown depicts the electrical frequency. this will be two times the mechanical frequency. an example calculation for motor speed in rpm from a 100 h z fundamental electrical frequency is shown as, 100 hz (1 electrical cycle)/(2 me chanical cycles) (60 seconds)/(1 minute) = 3 ,000 rpm figure 11 . spectral output for sine and cosine channels due to the layout of the amr bridge odd harmonics which are usually present in the output of sensors, such as third and fifth , are suppressed. spectral analysis of the sensor can be useful for debug ing purposes. even harmonics appear in this plot when there is gross misalignment between th e center of the amr sensor and the magnetic stimulus. radius plot the fifth set of figures are labeled radius check (see figure 12) . this figure plots the sine channel on the y - axis and the cosine channel on the x - axis. both axes are shown in 12 - bit codes. due to the sinusoidal nature of the two channels and the 90 phase delay between the sine and cosine channels the plot is circular in nature. the radius of this plot is constant throughout the entire rotation of the m agnetic stimulus. the exact radius of this plot is inversely proportional to the temperature of the ada4571 . at lower device temperatures, the radius increase s while at higher devic e temperatures the radius decrease s; when held at a constant temperature the radius will also be constant. figure 12 . radius plot of output waveforms the temperature dependent variation in output amplitude of the amr bridge is d ue to the reduced change in resistance of the amr film at higher temperatures. the ada4571 provides an internal regulated voltage to the amr bridge supply. by enabling the temperatu re compensation mode of the ada4571 , this regulated supply voltage var ies with temperature. at higher temperatures , the regulator provide s a higher bridge supply voltage, thus incre asing the output amplitude of the device. using this mode , the output amplitude and , therefore , radius in this plot will be more consistent over the wide temperature range of ? 40 c to 150 c. this mode is enabled by default by an internal pull - up resistor on the gc pin. moving jumper p3 to the correct position as outlined in figure 14 and figure 15 will disable the temper - ature compensation mode of the device. there is an internal temperat ure sensor on the ada4571 that is used to adjust the bridge supply voltage. the internal temperature sensor voltage is available to the end user and can be monitored on the daughter board or the motherboard as outlined in figure 14 and figure 15. rev. 0 | page 9 of 13
ug- 739 ada4571r- ebz user gui de figure 13 . ada4571 part diagnostic s tab rev. 0 | page 10 of 13
ada4571r- ebz user guide ug- 739 figure 14 . ada4571 board configuration tab rev. 0 | page 11 of 13
ug- 739 ada4571r- ebz user gui de evaluation board sch ematic figure 15 . ada4571 evaluation motherboard schematic rev. 0 | page 12 of 13
ada4571r- ebz user guide ug- 739 related links resource description ada4571 product page , a da4571 integrated amr angle sensor and signal conditioner ADP3336 product page , high accuracy ultralow i q , 500 ma anycap? adjustable low dropout regulator ad7866 product page , dual 1 msps, 12 - bit, 2 - channel sar adc with serial interface esd caution esd (electrostatic discharge) sensitive device . charged devices and circuit boards can discharge without detection. although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy esd. therefore, proper esd precautions should be taken to avo id performance degradation or loss of functionality. legal terms and condition s by using the evaluation board discussed herein (together with any tools, components documentation or support materials, the evaluation board), you are agreeing to be bound by the terms and conditions set forth below (agreement) unless you have purcha sed the evaluation board, in which case the analog devices standard terms and conditions of sale shall govern. do not use the evaluation board until you have read and agreed to the agreement. your use of the evaluation board shall signify your acceptance o f the agreement. this agreement is made by and between you (customer) and analog devices, inc. (adi), with its principal place of business at one technology way, norwood, ma 02062, usa. subject to the terms and conditi ons of the agreement, adi hereby grants to customer a free, limited, personal, temporary, non - exclusive, non - sublicensable, non - transferable license to use the evaluation board for evaluation purposes only. customer understands and agrees that the evalu ation board is provided for the sole and exclusive purpose referenced above, and agrees not to use the evaluation board for any other purpose. furthermore, the li cense granted is expressly made subject to the following additional limitations: customer shall not (i) rent, lease, display, sell , transfer, assign, sublicense, or distribute the evaluation board; and (ii) permit any third party to access the evaluation board. as used herein, the term third party includes any entity other than adi, customer, their employees, affiliates and in - hous e consultants. the evaluation board is not sold to customer; all rights not expressly granted herein, including ownership of the evaluation board, are reserved by adi. confidentiality. this agreement and the evaluation board shall all be considered the con fidential and proprietary information of adi. customer may not disclose or transfer any portion of the evaluation board to any other party for any reason. upon discontinuation of use o f the evaluation board or termination of this agreement, customer agrees to promptly return the evaluation board to adi. additional restrictions. customer may not disassemble, decompile or reverse engi neer chips on the evaluation board. customer shall inform adi of any occurred damages or any modifications or alterations it ma kes to the evaluation board, including but not limited to soldering or any other activity that affects the material content o f the evaluation board. modifications to the evaluation board must comply with applicable law, including but not limited to the roh s directive. termination. adi may terminate this agreement at any time upon giving written notice to customer. customer agrees to return to adi the evaluation board at that time. limitation of liability. the evaluation boar d provided hereunder is provided as is and adi makes no warranties or representations of any kind with respect to it. adi specifically disclaims any representations, endorsements, g uarantees, or warranties, express or implied, related to the evaluation board including, but not limited t o, the implied warranty of merchantability, title, fitness for a particular purpose or noninfringement of intellectual property rights. in no event will adi and its licensors be liable for any incidental, special, indirect, or consequential dam ages resulti ng from customers possession or use of the evaluation board, including but not limited to lost profits, delay costs, labor costs or loss of goodwill. adis total li ability from any and all causes shall be limited to the amount of one hundred us dollars ($ 100.00). export. customer agrees that it will not directly or indirectly export the evaluation board to another country, and that it will comply with all applicable united states federal laws and regulations relating to exports. governing law. this agreem ent shall be governed by and construed in accordance with the substantive laws of the commonwealth of massachusetts (excluding conflict of law rules). any legal action regarding this agreement will be heard in the state or fede ral courts having jurisdictio n in suffolk county, massachusetts, and customer hereby submits to the personal jurisdiction and venue of such courts. the united nations convention on contracts for the internation al sale of goods shall not apply to this agreement and is expressly disclai med. ? 2014 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. ug12526 - 0- 10/14(0) rev. 0 | page 13 of 13

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