EV-ADA4571RSDZ User Guide
UG-1169
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
Evaluating the ADA4571 Integrated AMR Angle Sensor and Signal Conditioner
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 9
FEATURES
USB 2.0 interface
Jumper or computer controlled temperature compensation
mode enable
Jumper or computer controlled power-down mode enable
Measurement test points and coaxial connectors
EVALUATION KIT CONTENTS
ADA4571 magnetic stimulus
Dipole magnet
Hand movable mounting
Readback electronics
ADDITIONAL HARDWARE REQUIRED
6 V to 12 V bench supply (optional)
SDP-S controller board
USB cable (supplied with the SDP-S controller board)
ADDITIONAL SOFTWARE REQUIRED
LabVIEW 2015 software downloadable from the
EV-ADA4571RSDZ product page
GENERAL DESCRIPTION
The EV-ADA4571RSDZ evaluation board features the ADA4571
in an end of shaft magnet configuration, as shown in Figure 1.
The evaluation kit is composed of an ADA4571 motherboard, a
magnetic stimulus on a hand turnable mount, a USB interface,
and an SDP-S controller board. The required LabVIEW 2015
graphical user interface (GUI) software for Windows® is available
for download from the EV-ADA4571RSDZ product page.
The EV-ADA4571RSDZ evaluation board features an on-board
5 V regulator; a 4-channel simultaneous sampling, analog-to-
digital converter (ADC); and jumpers for enabling the temperature
compensation and power-down modes within the ADA4571.
The ADA4571 motherboard also features test points and
unpopulated coaxial connectors for the three outputs of the
device.
The SDP-S controller board controls the ADC on the ADA4571
motherboard, reading back the ADA4571 outputs to change the
digital inputs to the ADA4571, interface with the GUI, and supply
power to the evaluation board through the USB connection.
For full details, see the ADA4571 data sheet, which must be used
in conjunction with this user guide when using the evaluation
board.
ADA4571 END OF SHAFT MAGNETIC EVALUATION SYSTEM
USB
PC GUI INTERFACE
SDP CONTROL
CARD
EVALUATION
SYSTEM
WITH MAGNETIC
STIMULUS
POWER
SUPPLY
6V T O 12V
SUPPLY
16135-001
Figure 1.
UG-1169 EV-ADA4571RSDZ User Guide
Rev. 0 | Page 2 of 9
TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Kit Contents ................................................................... 1
Additional Hardware Required ...................................................... 1
Additional Software Required ........................................................ 1
General Description ......................................................................... 1
ADA4571 End of Shaft Magnetic Evaluation System .................. 1
Revision History ............................................................................... 2
Evaluation Board Quick Start Procedures .................................... 3
Software Installation Procedures.................................................3
Evaluation Board Hardware .............................................................4
Jumper Configuration ..................................................................4
Device Under Test (DUT) Outputs.............................................4
Evaluation Board Software ...............................................................5
Starting the Evaluation GUI ........................................................5
Overview of the Main ADA4571 GUI Window .......................5
Motherboard Schematic ...................................................................8
REVISION HISTORY
8/2017—Revision 0: Initial Version
EV-ADA4571RSDZ User Guide UG-1169
Rev. 0 | Page 3 of 9
EVALUATION BOARD QUICK START PROCEDURES
SOFTWARE INSTALLATION PROCEDURES
Install the SDP-S controller board drivers and LabVIEW 2015
runtime engine before using the LabVIEW 2015 GUI.
LabVIEW 2015 Runtime Engine
To install the LabVIEW 2015 runtime engine, follow the
instructions on the National Instruments website.
SDP Installation
To install the SDP drivers, download the SDPDrivers.exe file
from the SDP-S product page and complete the following steps:
1. To initialize the installation, run the SDPDrivers.exe
executable file.
2. When the SDP drivers setup wizard appears, click Next
(see Figure 2).
16135-002
Figure 2. SDP Driver Installation Wizard
3. When the Choose Install Location window appears (see
Figure 3), click Install. To select a different destination
folder, click Browse, select a destination, then click Install.
16135-003
Figure 3. Choose Install Location Window
4. Click Finish to complete the installation of the SDP
drivers.
5. Before running the LabVIEW GUI, Connect the SDP-S
controller board to the motherboard and plug the SDP-S
controller board into the PC with the supplied USB cable.
The computer now recognizes the SDP-S controller board,
and the LabVIEW 2015 GUI can be opened.
Running the LabVIEW GUI
To run the GUI, download the LabVIEW GUI software from
the ADA4751 product page and complete the following steps:
1. Place the downloaded executable file and supporting files
in a convenient location for use (see Figure 4). It is
recommended to place these files on the root C drive of the
PC. Do not separate the executable file from the other files
that are downloaded or the executable file cannot run.
16135-004
Figure 4. Place Downloaded Files on the PC
2. Double click the ADA4571_EVB.exe file to launch the
LabVIEW GUI.
UG-1169 EV-ADA4571RSDZ User Guide
Rev. 0 | Page 4 of 9
EVALUATION BOARD HARDWARE
The EV-ADA4571RSDZ end of shaft evaluation system comprises
of a printed circuit board (PCB) with the AD7866 ADC and an
external mountable magnetic stimulus.
The ADA4571 evaluation system can be powered directly from
the host PC USB, from an external bench supply, or through the
on-board 5 V regulator (ADP3336).
To power the motherboard through an on-board 5 V reference,
apply 6 V to 12 V across the P7 to P8 connectors and configure
the jumpers accordingly. If the bench supply features current
limiting, it is recommended to set the current limit to 100 mA as
a precaution.
JUMPER CONFIGURATION
Refer to the ADA4571 motherboard schematic (see Figure 13) to
understand the purpose of each jumper.
Configure the P10 motherboard default jumper as follows:
•Install a jumper on P10 between the USB_VBUS supply
and the +5V_ANALOG supply to power the evaluation
board through the USB connection at the PC.
•Alternatively, install a jumper on P10 between +5V_REG
supply and the +5V_ANALOG supply to power the
evaluation board through the external bench supply
DEVICE UNDER TEST (DUT) OUTPUTS
The outputs of the ADA4571 can be monitored at the test points
located on the evaluation board.
All outputs from the ADA4571 are also sampled by the on-board
ADC and are available in the LabVIEW GUI.
EV-ADA4571RSDZ User Guide UG-1169
Rev. 0 | Page 5 of 9
EVALUATION BOARD SOFTWARE
STARTING THE EVALUATION GUI
To power the evaluation board using the ADP3336 on-board
5 V supply, install a jumper on P10, connecting the +5V_REG
supply and the +5V_ANALOG supply. Using an external power
supply, plug the positive supply for the evaluation board into the
red terminal, P7, and plug the negative terminal into P8 on the
ADA4571 motherboard. The evaluation board requires between
6 V and 12 V, which is then regulated to 5 V on the ADA4571
motherboard using the on-board ADP3336. This supply powers
both the on-board ADC (AD7866) as well as the ADA4571.
To use the EV-ADA4571RSDZ evaluation board with full
USB power, install a jumper on P10, connecting the USB_VBUS
supply and the +5V_ANALOG supply. The 5 V USB power
supplies the ADA4571.
OVERVIEW OF THE MAIN ADA4571 GUI WINDOW
Figure 5 shows the main ADA4571 GUI window after
launching it.
When launching the GUI, the SDP-S controller board must be
recognized by the GUI before proceeding. Click the Connect
SDP button to read the EEPROM identification of the mother-
board and ensure that the correct program is in use. If the SDP-S
controller board is not connected, or if the drivers are not
installed correctly, an error message appears. Ensure that the
drivers are installed correctly, and that the PC recognizes the
SDP-S controller board, if this occurs.
When the SDP-S controller board is properly connected, and the
program recognizes the motherboard, the status bar reads SDP
Board Ready and the yellow LED turns green (see Figure 5).
Initially, all figures are blank. Click Start Sampling to begin
sampling the ADA4571.
16135-005
Figure 5. ADA4571 Evaluation Board Software Main Window
UG-1169 EV-ADA4571RSDZ User Guide
Rev. 0 | Page 6 of 9
VSIN, VCOS, and VTEMP Raw Outputs
The Vsin, Vcos and VTEMP Raw Outputs graph shows the
three outputs from the ADA4571 magnetic angle sensor (see
Figure 6).
16135-006
Figure 6. Vsin, Vcos, and VTEMP Raw Outputs Graph
In Figure 6, the blue and red waveforms indicate the VSIN channel
and VCOS channel outputs, respectively, and the green waveform
indicates the VTEMP channel output. As the magnet rotates
above the ADA4571, the VSIN and VCOS outputs change while
staying 90° out of phase. These two channels ,VCOS and VSIN,
report similar results that differ by the relative rotation of the
sensor die and the voltage offset differences for the sine and
cosine channels.
Figure 6 shows the output waveforms sampled by the AD7866
ADC. The waveforms are plotted in 12-bit code. The AD7866
simultaneously samples VSIN and VCOS. An internal reference of
2.5 V is subtracted in the hardware because the readout of the ADC
is in twos complement. Therefore, the two signals center around
0 in the raw waveform plot. In a real application, it is important
that these two channels are simultaneously sampled because
extra errors can be introduced from the phase delay between
the sampling of the individual channels. For every 50 samples of
the VSIN and VCOS, the AD7866 samples the VTEMP channel.
When powering the EV-ADA4571RSDZ evaluation board through
the USB connector attached to the SDP-S controller board, some
variation appears in the supply voltage of the ADA4571.
Because the readout of the AD7866 is in twos complement
format, with respect to the internal 2.5 V reference, the offset of
these waveforms is higher than the inherent offset of the
ADA4571. After offset correction of the sine and cosine signals,
which is recommended for the end use of the sensor, the offsets
due to the ADC reference, as well as the sensor offset, are
removed.
Graphing Options
When the EV-ADA4571RSDZ evaluation board is operating, it
constantly samples the VSIN channel and VCOS channel, and it
samples the VTEMP channel after every 50 samples of the VSIN
and the VCOS channels.
To choose the interval between samples, enter different values
in the ms between samples text box (see Figure 7). The default
interval is 10 ms. This delay is set after information is transferred
from the AD7866.
The # samples to Graph field sets the number of samples to
save and display in the graphs. The default number of samples
saved and displayed is 200 samples.
16135-007
Figure 7. Graphing Options Pane
Outputs and Calculated Values
The values shown in the Output and calculated values pane
show the ADA4571 output information in number format (see
Figure 8). Again, the VSIN, VCOS, and VTEMP outputs are in
12-bit, twos complement format with respect to the 2.5 V
internal reference of the AD7866 ADC.
16135-008
Figure 8. Outputs and calculated values Pane
A calculated angle value is also shown in Figure 8, given by the
Arctangent2 (Angle) function field, and a calculated radius,
given by the square root of the sum of squares for VSIN channel
and VCOS channel in the Radius (Code) field.
Electrical Angle
The electrical angle plot gives the calculated Arctangent2 (Angle)
value in a visual format, as shown in Figure 9. As the magnetic
field angle changes at the anisotropic magneto resistive (AMR)
sensors, the electrical angle changes.
16135-009
Figure 9. Electrical Angle Plot
EV-ADA4571RSDZ User Guide UG-1169
Rev. 0 | Page 7 of 9
Vsin vs. Vcos Plot
The Vsin vs Vcos graph shows the electrical angle from the
ADA4571. However, there is more information shown in
Figure 10, such as the radius of the output values that can give
further diagnostic information to system. As long as the sensor
is fully saturated, or the applied magnetic field strength exceeds
25 kA/m, the radius value remains unchanged at a constant
temperature. As the AMR effect is smaller at high temperatures,
the radius value changes with respect to temperature. See the
ADA4571 data sheet for the temperature coefficient values for
the output amplitude for the VSIN and the VCOS channels.
16135-010
Figure 10. Vsin vs Vcos Graph
Digital Inputs
To toggle two digital inputs on the ADA4571, click the buttons
in the Digital Inputs pane (see Figure 11).
The Power Down Disabled button puts the ADA4571 in a low
power state by disabling the internal circuitry and placing the
outputs in a high impedance state. See the ADA4571 data sheet
for full details on the power-down current of the device.
The Gain Control Disabled button puts the device in gain control
mode (see Figure 11). This mode alters the bridge supply voltage
based on the internal temperature value of the ADA4571.
Through gain control mode, the output amplitude temperature
coefficient of the ADA4571 reduces. See the ADA4571 data sheet
for full details on output amplitude vs. temperature with the gain
control mode enabled and disabled.
16135-011
Figure 11. Digital Inputs Pane
Offset Calibration
An offset calibration is required to maximize the accuracy of
the ADA4571. The VSIN and VCOS channels have inherent voltage
offsets due to a resistor mismatch within the AMR sensor bridges.
See the ADA4571 data sheet for full details on the offset voltage
ranges for the outputs.
There are a few methods that can null the offsets for the outputs.
The ADA4571 GUI uses a maximum/minimum value to calculate
these offsets. To run an offset calibration, click Run Cal (see
Figure 12). When Run Cal is clicked, rotate the magnetic stimulus
slowly through an entire mechanical rotation. This slow rotation
ensures that the maximum and minimum output voltages are
found for each channel.
The offset of each channel is calculated as the midpoint between
the maximum and mid values captured during the calibration
cycle. During normal operation, the offset value for each channel is
subtracted from the current value before calculating the magnetic
angle.
16135-012
Figure 12. Offset Calibration Pane
UG-1169 EV-ADA4571RSDZ User Guide
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MOTHERBOARD SCHEMATIC
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DNI
49.9
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571-0100
1N5818
10UF
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MOLEX22-03-2031
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FX8-120S-SV(21)
0.1UF
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MOLEX22-03-2031
DNI
AD7866ARUZ
0.1UF
5K
DNI
10000PF
10000PF
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5K
.47UF
ADP3336ARMZ
1UF
10UF
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100K
1UF
M24C64-WMN6TP
R13
R12
R11
TP7
C14 C13
R9
R6
R10
R8
C11
R7
P10
C10
C6
C5
TP2
SNS1
C15
D1
1P 1P
U3
C9
JP3
JP1
R5
C8
C7
R4
P2
P3
C4
C2
C3
R2
U2
R3
U1
C1 R1
P7
P8
A0_7866
SCL_0_BUF
+ SUPPLY
SIN_OUT
DUT PD
+5V ANALOG
USB_VBUS
DUT TC
DUT PD
MISO_BUF
SEL_A_BUF
EEPROM_A0
SDA_0
SCL_0 SDA_0_BUF
A0_7866
+5V_REG
+5V ANALOG
DUT VTEM P
DUT TC
+5V ANALOG
SIN_OUT
MISO_BUF
COS_OUT
+5V ANALOG
+5V ANALOGCLK_BUF
SEL_A_BUF
+3V ANALOG
COS_OUT
CLK_BUF
+ SUPPLY
+5V_REG
SPI_MISO
SPI_SEL_A
SPI_CLK
+3V ANALOG
+3V ANALOG
SCL_0_BUF
USB_VBUS
EEPROM_A0
SDA_0_BUF
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A0
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SCLK
VDRIVE
DOUTB
DOUTA
DGND
DVDDAVDD
RANGE
VREF
DCAPA
AGND
VA1
VA2
VB1
VB2
AGND
DCAPB
131-3701-261 131-3701-261DNIDNI
TP5TP4 J2J1 COS_OUTSIN_OUT 11 1
5432 5432
1
VSS
SCL
SDA
WC_N
E2
E1
E0VCC
OUT2
IN
IN1
OUT
OUT1
FB
GNDSD_N
22NF
ADA4571ARZ
C12
U4
TP6
+5V ANALOG
DUT PDDUT TC
COS_OUT
DUT VTEM PSIN_OUT 54
72 8
63
1
1
PD
VDD
GND
VTEMPVSIN
GND
VCOS
GC
Figure 13. ADA4571 Evaluation Motherboard Schematic
EV-ADA4571RSDZ User Guide UG-1169
Rev. 0 | Page 9 of 9
NOTES
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
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©2017 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG16135-0-8/17(0)
