ADA4571R-EBZ [ADI]
Customer supplied 6 V to 12 V bench supply;
| 型号： | ADA4571R-EBZ |
| 厂家： | 
ADI |
| 描述： | Customer supplied 6 V to 12 V bench supply |
| 文件： | 总13页 (文件大小：847K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
GENERAL DESCRIPTION
USB 2.0 interface
The end of shaft evaluation system is composed of a Windows
LabVIEW® GUI software, an ADA4571 motherboard, 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.
Jumper for temperature compensation mode enable
Jumper for power down mode enable
Measurement test points and coaxial connectors
EVALUATION KIT CONTENTS
The motherboard features an on-board 5 V regulator, a
2-channel simultaneous sampling ADC and jumpers for
enabling the temperature 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.
ADA4571 magnetic stimulus:
Dipole magnet
Brushed or brushless dc motor with integrated control
electronics
Evaluation software CD-ROM (Windows® 7 32-bit and 64-bit
compatible GUI)
The daughter board features the ADA4571 mounted above the
magnetic stimulus as well as test points for the three outputs of
the device.
ADDITIONAL EQUIPMENT NEEDED
Customer supplied 6 V to 12 V bench supply
SDP interface board
USB cable (supplied with SDP interface board)
The SDP board is used to control the ADC on the motherboard
and interface with the GUI.
EVALUATION BOARD CONNECTION DIAGRAM
6V TO 12V
SUPPLY
POWER
SUPPLY
PC GUI INTERFACE
EVALUATION
SYSTEM
WITH MAGNETIC
STIMULUS
USB
SDP CONTROL
CARD
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 Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
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
Evaluation Kit Contents................................................................... 1
Additional Equipment Needed....................................................... 1
General Description......................................................................... 1
Evaluation Board Connection Diagram........................................ 1
Revision History ............................................................................... 2
Getting Started.................................................................................. 3
Software Installation Procedures................................................ 3
REVISION HISTORY
10/14—Revision 0: Initial Version
Rev. 0 | Page 2 of 13
ADA4571R-EBZ User Guide
UG-739
GETTING STARTED
SDP Installation
SOFTWARE INSTALLATION PROCEDURES
Next, install the Analog Devices, Inc., SDP driver. This driver
allows the SDP control board to interface with the LabVIEW
GUI.
There are two pieces of software to install: the Windows GUI
and the SDP drivers.
Windows GUI Installation
1. When the SDP drivers setup wizard appears, click Next
Use the following steps to install the GUI.
(see Figure 4).
1. Before connecting the USB cable or powering the board,
insert the ADA4571-EBZ setup CD and from the installer
directory, run the installer Setup.exe.
2. When the Destination Directory screen appears (see
Figure 2), click Next. Optionally, you may change the
destination folder by clicking Browse, selecting a different
destination folder, and clicking Next.
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, selecting a different
destination folder, and clicking Next.
Figure 2. Choose Destination Location
3. When the Start Installation window appears click Next to
continue with the installation (see Figure 3).
Figure 5. Choose Install Location
3. Click Finish to complete the installation of the SDP
drivers.
4. Connect the SDP control card to the motherboard and
plug the SDP control card into the PC with the supplied
USB cable. The computer now recognizes the SDP control
board and the LabVIEW GUI may be opened to continue.
Figure 3. Review Installation
4. Click Next to complete installation of the Windows
LabVIEW GUI.
Rev. 0 | Page 3 of 13
UG-739
ADA4571R-EBZ User Guide
EVALUATION BOARD HARDWARE
The ADA4571 end of shaft demo evaluation system comprises
of two boards (ADA4571 motherboard and ADA4571 daughter
board) and a brushless dc motor.
JUMPER CONFIGURATION
Refer to the ADA4571 motherboard schematic (see Figure 15)
or the configuration panel to understand the purpose of each
jumper.
The ADA4571 evaluation system can be powered directly
from the host PC USB or from an external bench supply. For
maximum performance, it is recommended that an external
bench power supply be used.
Configure the motherboard default jumper as follows (see
Figure 15):
•
•
•
Install the P9 and P10 jumpers 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 enables
the gain control mode of the part. When P3 connects GC
to GND, gain control mode is disabled.
Install the P2 jumper connecting PD to GND. This disables
the power-down mode of the part. When P2 connects PD
to VDD, power-down mode is enabled and the ADA4571
outputs are put into a high impedance state.
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 motherboard by an external bench supply, apply
6 V to 12 V to P7, the red terminal. When supplied by an
external bench 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.
DUT OUTPUTS
The outputs of the ADA4571 may be monitored at the test
points located on the daughter board or the motherboard. The
VSIN, VCOS, and VTEMP pins are all accessible on both of the
boards.
To power the motor by an external bench supply, 3 V to 9 V can
be applied to P6, the blue terminal. The ground 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 provides 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 the
ADA4571. See the Angular Error (Linearity) section for more
information on motor performance.
Rev. 0 | Page 4 of 13
ADA4571R-EBZ User Guide
UG-739
HOW TO USE THE SOFTWARE
Plug the positive supply for the motor into the blue terminal,
STARTING UP THE EVALUATION GUI
P6, on the motherboard. Due to mechanical nonlinearities of
the dc motor, such as cogging during coil commuting, extra
errors are introduced to the system at higher rotational
velocities. For best performance, apply 3 V to Ext Motor
terminal. If the motor supplied is a brushless dc motor; 3 V
results in rotational speeds of approximately 2,000 RPM. Speeds
up to 10,000 RPM are possible with 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.
For maximum performance when the evaluation board is first
powered up, control both the motor and the board using an
external bench power supply. The jumper settings for P9 and
P10 should be set for Ext Motor and Ext +5V as indicated on
the board.
Plug the positive supply for the board into the red terminal, P7,
on the motherboard. This terminal requires 6 V to 12 V which
is then regulated to 5 V on the motherboard using the on-board
ADP3336. This supply powers both the on-board ADC, AD7866,
as well as the daughter board containing the ADA4571.
The nonidealities of the motor result in a higher reported
nonlinearity of the device. This is an artifact of the motor
and not the ADA4571. With an ideal magnetic stimulus, the
ADA4571 has the same angular error performance regardless
of rotational velocity.
Rev. 0 | Page 5 of 13
UG-739
ADA4571R-EBZ User Guide
Initially 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.
OVERVIEW OF THE MAIN GUI WINDOW
Figure 6 shows the main GUI window, as it appears, after
launching the GUI.
There are two different categories of output waveforms as
indicated by the GUI. The waveforms on the top of each tab,
indicated as Uncorrected Plots, are without any post processing
to correct for output offset before calculations are done on the
raw data. In the case of the bottom waveforms, indicated as
Offset Corrected 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.
When the program is first launched the SDP controller board
must be recognized by the GUI before proceeding. Pressing
Connect SDP reads 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
correctly an error message will be shown. Ensure 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.
Figure 6. ADA4571 Main Window
Rev. 0 | Page 6 of 13
ADA4571R-EBZ User Guide
UG-739
Raw Waveforms
Arc Tangent2 (Magnetic Angle)
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 internal 2.5 V
reference of the AD7866 has been subtracted in hardware as
the readout of the ADC is in twos complement. Therefore, the
two signals are centered around zero in the raw waveform plot.
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 delay between the sampling of the individual
channels.
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 = ArcTangent2(VSIN/VCOS
)
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.
Normally 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 has this quadrant information and therefore the
range is extended to (−180° to +180°). The program then zeros
this waveform and therefore shows the angle between (0° and
360°).
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 then subtracted from their respective channel to give
the end waveform centered perfectly about zero.
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
electrical revolutions are used for calculations. This results in
six periods of angle information shown.
Note that when 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 readout of the
AD7866 being in twos complement form with respect to the
internal 2.5 V reference, the offset of these waveforms will
be higher than the inherent offset of the ADA4571.
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 ArcTangent (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 results
in a much more linear output plot.
Rev. 0 | Page 7 of 13
UG-739
ADA4571R-EBZ User Guide
Angular Error (Linearity)
Figure 10 shows the Offset Corrected Error (Degrees) plot.
Large spikes appear in this plot 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
error at these points. The sensor measures the position of the
magnetic stimulus and so these kicks 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, these spikes will not
appear in the error plot.
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 cogging 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 calculated
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 stimulus.
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 10. Offset Corrected Linearity Error Plot
Figure 9 shows the Uncorrected Angular Error (Degrees) plot.
When powered by the host PC USB supply this waveform
reports higher 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. When 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
Rev. 0 | Page 8 of 13
ADA4571R-EBZ User Guide
UG-739
Fourier Transform
Radius Plot
The fourth set of figures are labeled Fourier Transform. These
figures show the spectral analysis of the two independent
output signals. The fundamental frequency corresponds 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), magnitude in 12-bit code of that specific frequency.
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 magnetic stimulus. The exact radius of this plot is
inversely proportional to the temperature of the ADA4571. At
lower device temperatures, the radius increases while at higher
device temperatures the radius decreases; when held at a
constant temperature the radius will also be constant.
The x-axis is shown in 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 Hz fundamental electrical frequency
is shown as,
100 Hz × (1 electrical cycle)/(2 mechanical 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.
Figure 12. Radius Plot of Output Waveforms
The temperature dependent variation in output amplitude of
the AMR bridge is due 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 temperature compensation mode of the ADA4571,
this regulated supply voltage varies with temperature. At higher
temperatures, the regulator provides a higher bridge supply
voltage, thus increasing 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.
Spectral analysis of the sensor can be useful for debuging
purposes. Even harmonics appear in this plot when there is
gross misalignment between the center of the AMR sensor
and the magnetic stimulus.
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
temperature 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 Guide
Figure 13. ADA4571 Part Diagnostics 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 Guide
EVALUATION BOARD SCHEMATIC
Figure 15. ADA4571 Evaluation Motherboard Schematic
Rev. 0 | Page 12 of 13
ADA4571R-EBZ User Guide
UG-739
RELATED LINKS
Resource
ADA4571
ADP3336
AD7866
Description
Product Page, ADA4571 Integrated AMR Angle Sensor and Signal Conditioner
Product Page, High Accuracy Ultralow IQ, 500 mA anyCAP® Adjustable Low Dropout Regulator
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 avoid performance degradation or loss of functionality.
Legal Terms and Conditions
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 purchased 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 of 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 conditions 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 Evaluation 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 license 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-house 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 confidential 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 of 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 engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS 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 BOARD 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, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, 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 DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF
THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY 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 Agreement 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 federal courts having jurisdiction 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 International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
©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
相关型号：
©2020 ICPDF网 联系我们和版权申明