Analog Devices EV-ADA4571RSDZ Manuel utilisateur

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 TO 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 themain 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

Rev. 0 | Page 8 of 9

MOTHERBOARD SCHEMATIC

16135-013

DNI

49.9

571-0100

1N5818

10UF

49.9

571-0500

DNI

210K

49.9 49.9

MOLEX22-03-2031

0.1UF

49.9

64.9K

FX8-120S-SV(21)

0.1UF

FX8-120S-SV(21)

MOLEX22-03-2031

DNI

AD7866ARUZ

0.1UF

DNI

10000PF

0.1UF

DNI

.47UF

ADP3336ARMZ

1UF

10UF

.47UF

0.1UF

100K

1UF

M24C64-WMN6TP

R13

R12

R11

TP7

C14 C13

R10

C11

P10

C10

TP2

SNS1

C15

1P 1P

JP3

JP1

C1 R1

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 VTEMP

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

SCL_0_BUF

USB_VBUS

EEPROM_A0

SDA_0_BUF

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

REF_SELECT

CS_N

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

VSS

SCL

SDA

WC_N

E0VCC

OUT2

IN1

OUT

OUT1

GNDSD_N

22NF

ADA4571ARZ

C12

TP6

+5V ANALOG

DUT PDDUT TC

COS_OUT

DUT VTEMPSIN_OUT 54

72 8

VDD

GND

VTEMPVSIN

GND

VCOS

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

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.

registered trademarks are the property of their respective owners.

UG16135-0-8/17(0)

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