Analog Devices EVAL-ADA4570SDZ User manual

User Guide | EVAL-ADA4570

UG-2004

Integrated AMR Angle Sensor and Signal Conditioner with Differential Outputs

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | 1 of 17

FEATURES

►Full featured evaluation board for the ADA4570

►PC control in conjunction with the System Demonstration Plat-

form (SDP) (EVAL-SDP-CS1Z, SDP-S or EVAL-SDP-CB1Z,

SDP-B)

►PC software for data measurement and display

EVALUATION KIT CONTENTS

►EVAL-ADA4570SDZ evaluation board

►ADA4570 magnet stimulus

►Dipole magnet

►Hand movable mounting

ADDITIONAL HARDWARE REQUIRED

►The SDP-S or the SDP-B controller board with a USB cable

ADDITIONAL SOFTWARE REQUIRED

►EVAL-ADA4570SDZ Software Installer

GENERAL DESCRIPTION

The ADA4570 is an anisotropic magnetoresistive (AMR) sensor

with integrated signal conditioning amplifiers and analog-to-digital

converter (ADC) drivers. The ADA4570 produces two differential

analog output pairs that indicate the angular position of the sur-

rounding magnetic field.

The EVAL-ADA4570SDZ evaluation board features the ADA4570 in

an end of shaft magnet configuration.

The evaluation kit is composed of the EVAL-ADA4570SDZ and

a magnetic stimulus on a printed circuit board (PCB) mount. To in-

terface to a computer, the EVAL-SDP-CS1Z (SDP-S) or the EVAL-

SDP-CB1Z (SDP-B) is required which must be ordered separately.

An illustration of the ADA4570 evaluation system consisting of

the PC graphic user interface (GUI), the SDP, and the EVAL-

ADA4570SDZ is shown in Figure 1. In this user guide, SDP refers

to either the SDP-S or the SDP-B interface card.

The EVAL-ADA4570SDZ allows a detailed evaluation of the

ADA4570 where the software GUI demonstrates angular measure-

ment and performs system level calibration.

The EVAL-ADA4570SDZ also provides access via a standard

header for power and digital signals to the on-board ADC interface

(AD7266), which allows evaluation of the ADA4570 with a user

preferred microcontroller platform and to start the system software

development. Users can also access the analog output signals

of the ADA4570 to a user preferred ADC with a microcontroller

platform.

The PCB is designed so that the sensor board can be detached

from the SDP interface to provide a smaller form factor. Power

supplies can be sourced from either the USB port via the SDP card

or an external bench supply.

For full details, see the ADA4570 data sheet, which must be

used in conjunction with this user guide when using the EVAL-

ADA4570SDZ.

ADA4570 END OF SHAFT MAGNETIC EVALUATION SYSTEM

Figure 1. ADA4570 End of Shaft Magnetic Evaluation System Consisting of the PC GUI, the SDP, and the EVAL-ADA4570SDZ

User Guide EVAL-ADA4570

TABLE OF CONTENTS

analog.com Rev. 0 | 2 of 17

Features................................................................ 1

Evaluation Kit Contents......................................... 1

Additional Hardware Required...............................1

Additional Software Required................................ 1

General Description...............................................1

ADA4570 End of Shaft Magnetic Evaluation

System.................................................................1

Getting Started...................................................... 3

Quick Start Steps............................................... 3

Evaluation Board Hardware...................................4

Configuration of the EVAL-ADA4570SDZ.......... 4

Evaluation Board Quick Start ............................... 6

Software Installation Procedures........................6

Evaluation Board Software.................................... 8

Starting the Evaluation GUI................................8

Overview of the Main ADA4570 Evaluation

Software GUI Window......................................9

Evaluation Board Schematics and Silkscreen..... 13

Ordering Information ...........................................16

Evaluation Board Bill of Materials.....................16

Notes................................................................17

REVISION HISTORY

7/2021—Revision 0: Initial Version

User Guide EVAL-ADA4570

GETTING STARTED

analog.com Rev. 0 | 3 of 17

QUICK START STEPS

The SDP is the controller board, which is the communication link

between the PC and the EVAL-ADA4570SDZ, and provides the

serial peripheral interface (SPI) required to transfer ADA4570 data

sampled by the ADC directly to the host PC.

Note that the evaluation software and the SDP USB driver must be

installed before connecting the EVAL-ADA4570SDZ board and the

SDP board to the USB port of the PC to ensure that the evaluation

system is correctly recognized when the EVAL-ADA4570SDZ is

connected.

The SDP USB Driver Installer can be found by following the Soft-

ware tab on the EVAL-SDP-CS1Z (SDP-S) or the EVAL-SDP-CB1Z

(SDP-B) product pages.

To begin using the EVAL-ADA4570SDZ, take the following steps:

1. Connect the SDP board to the EVAL-ADA4570SDZ (see

Figure 2).

2. Slide the EVAL-ADA4570SDZ into the magnet mounting brack-

et at the bottom PCB mount side rail. To correctly align

the magnet with the ADA4570 sensor, ensure that the EVAL-

ADA4570SDZ is fully inserted into the magnet PCB mount.

3. Connect the SDP board to the computer using the supplied

USB cable (USB Type A to Mini-B).

4. To launch the EVAL-ADA4570SDZ software, click the Win-

dows® key to open the Windows Start menu and Programs list.

Navigate to Analog Devices and click EVAL-ADA4570SDZ.

Figure 2. Hardware Configuration Showing the Demonstration Magnet Assembly, EVAL-ADA4570SDZ, and the SDP-B

User Guide EVAL-ADA4570

EVALUATION BOARD HARDWARE

analog.com Rev. 0 | 4 of 17

The EVAL-ADA4570SDZ end of shaft evaluation system comprises

a PCB with the ADA4570, an AD7266 ADC, and an external

mountable magnetic stimulus.

CONFIGURATION OF THE EVAL-ADA4570SDZ

The EVAL-ADA4570SDZ was designed to provide flexibility for

users. The following configurations are available:

►SDP and Analog Devices, Inc, software controlled

►Using an external digital interface

►A direct analog interface with the ADA4570 sensor

If an external power supply is connected to supply the EVAL-

ADA4570SDZ, the current limitation of the external power supply

must be set to 100 mA as a precaution.

SDP and Analog Devices Software Controlled

The ADA4570 evaluation system can be powered directly from

the host PC USB by the SDP controller board via the P3 connec-

tor. Use the CON A connector of the SDP controller board to

connect to P3 (see SDP and Analog Devices Software Controlled).

The Connector P3 pinout with the used SDP connections for the

EVAL-ADA4570SDZ is listed in Table 1, which is the recommended

configuration for the user to quickly achieve high performance

measurement.

This configuration uses the SDP to communicate with the AD7266

ADC to sample the sensor output and display the data with the

software provided.

Figure 3. Connector P3 to Interface SDP and EVAL-ADA4570SDZ

Table 1. P3 Socket for the SDP Interface

Pin Number Function Description

3, 4, 6, 11, 23, 28, 36, 40, 46, 52, 58, 63, 69, 75, 81, 86, 93, 98, 104,

109, 115, 117, 118

GND System ground

5 5 V supply 5 V supply from the USB port of the connected PC

43 REF_SESECT Reference voltage select

44 RANGE Input range select

45 SGL/DIFF Differential and single-ended select

56 EEPROM_A0 Address A0 of the board identifier EEPROM

76 GPIO5 SDP general-purpose input and output (GPIO)

77 GPIO3 SDP GPIO

78 GPIO1 SDP GPIO

79 I2C SCL I2C clock

80 I2C SDA I2C data

82 SPI SCL SPI clock

83 SPI SDO SPI slave data out

84 SPI SDI SPI slave data in

85 SPI SPI chip select for the GPIO expander, SDP Chip Select A

116 3.3 V supply Main supply for supporting devices

User Guide EVAL-ADA4570

EVALUATION BOARD HARDWARE

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Using an External Digital Interface

The EVAL-ADA4570SDZ facilitates a configuration option where

the user can connect an external microcontroller or field program-

mable gate array (FPGA) to the on-board AD7266 ADC (see

Figure 4).

Figure 4. Typical Connection Diagram for Using the Digital Interface

Connector P2, shown in Figure 4, provides the required connectivity

to power the AD7266 ADC and the ADA4570 as well as the

interface to the AD7266 ADC. This configuration allows users to

monitor the digitized output of the ADA4570 with a user preferred

embedded hardware platform. The pinout of Connector P2 is listed

in Table 2. The SDP controller board supports a maximum SPI

speed of 10 MHz, which limits the sampling rate of the AD7266

ADC to 625 kSPS. This configuration can be used to facilitate data

acquisition with a faster sampling rate up to 2 MSPS.

Figure 5. Connector P2 for Access to the SPI of the ADC of the EVAL-

ADA4570SDZ

Table 2. Optional Digital Interface Connection of P2

Pin Name Input Type Description

VDD Supply The 5 V input that supplies the evaluation

board.

OUT1, OUT2,

CLK, CS

Digital inputs and

outputs

SPI.

VIO Supply and digital

input for

REF_SELECT of

the AD7266

When used in this configuration, VIO

selects the AD7266 ADC reference

source. If high, it is the external ADC

reference, and if low it is the internal 2.5 V

reference.

A0, A1, A2 Digital inputs Digital inputs to control the input channel

of the ADC. The Ax pins can control which

output configuration is sampled by the on-

board ADC.

GND Ground Ground connection of the EVAL-

ADA4570SDZ.

For full details about the SPI and how to interface the different pins,

refer to the EVAL-ADA4570SDZ schematics (see Figure 27 and

Figure 28) and the AD7266 data sheet.

Direct Analog Interface with the ADA4570

The EVAL-ADA4570SDZ facilitates a configuration option where

the user can connect an external ADC to the ADA4570 output

signals (see Figure 6).

Figure 6. Typical Connection Diagram for Using Direct Access to the

ADA4570 Sensor

Connector P1, shown in Figure 7, provides the required connectivity

to supply the ADA4570 and access to the ADA4570 output signals

for the external ADC. This configuration allows users to sample

the sine and cosine outputs of the ADA4570 with a user preferred

differential ADC. The pinout of Connector P1 is listed in Table 3.

Figure 7. Connector P1 for Direct Access to the Sensor Output

Table 3. Optional Analog Interface Connection of P1

Pin Name Input Type Description

VDD Supply 5 V supply of the EVAL-ADA4570SDZ

VSIN− Analog output Negative analog sine output from the

ADA4570

VSIN+ Analog output Positive analog sine output from the

ADA4570

VCOS− Analog output Negative analog cosine output from the

ADA4570

VCOS+ Analog output Positive analog cosine output from the

ADA4570

VTEMP Analog output Analog output from the ADA4570

NC Ground No connect pin

GND Ground Ground connection of the EVAL-

ADA4570SDZ

For full details about the ADA4570 sensor interface and how to

connect the device, refer to the EVAL-ADA4570SDZ schematics

(see Figure 27 and Figure 28) and the ADA4570 data sheet.

User Guide EVAL-ADA4570

EVALUATION BOARD QUICK START

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The EVAL-ADA4570SDZ evaluation board can be controlled with

the EVAL-ADA4570SDZ Evaluation Board Software. The following

sections provide instructions for installing the supporting software

and an overview for connecting the hardware to the PC.

SOFTWARE INSTALLATION PROCEDURES

Installing the EVAL-ADA4570SDZ Evaluation

Software

To install the EVAL-ADA4570SDZ evaluation software, take to the

following steps:

1. Start the Windows operating system of the PC and download

the ADA4570 Evaluation Board Installer software.

2. Unzip the downloaded file. Run the setup.exe file.

3. Click the setup.exe file to begin installing the evaluation soft-

ware. The software installation window opens as shown in

Figure 8.

Figure 8. EVAL-ADA4570SDZ Evaluation Software Install Window

4. Choose the installation directory and click Next. The default

location is C:\Program Files (x86)\Analog Devices\.

Figure 9. Destination Directory Window

5. Installing the EVAL-ADA4570SDZ Evaluation Software re-

quires users to accept the license agreement shown in

Figure 10. Read the agreement before clicking Next to proceed.

Figure 10. License Agreement Window

6. The window shown in Figure 11 provides a summary of the

software installation. Click Next to install the software listed in

the window.

Figure 11. Start Installation Window

7. A pop-up window then opens and displays a bar showing the

installation progress, as shown in Figure 12.

Figure 12. Overall Progress

The installation then completes, and the next step is to install the

SDP drivers.

User Guide EVAL-ADA4570

EVALUATION BOARD QUICK START

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SDP Installation

To install the SDP drivers, download the SDPDrivers.exe file from

the SDP product page (SDP-S or SDP-B) and complete the follow-

ing steps:

1. To initialize the installation, run the SDPDrivers.exe executable

file.

2. When the SDP drivers setup wizard appears, click Next (see

Figure 13).

Figure 13. SDP Driver Setup Wizard

3. When the Choose Install Location window appears (see

Figure 14), click Install. To select a different destination folder,

click Browse, select a destination, then click Install.

Figure 14. Choose Install Location Window

4. Click Finish to complete the installation of the SDP drivers.

5. When plugging in the SDP controller board via the provided

USB cable, allow the Found New Hardware Wizard to run.

Check that the SDP drivers are installed and that the SDP

controller board are connected properly by checking the Device

Manager of the PC. If the drivers and board are connected

properly, the Analog Devices System Demonstration Plat-

form SDP appears under ADI Development Tools

(see Figure 15).

Figure 15. Device Manager Menu

6. The computer now recognizes the SDP controller board, and

the EVAL-ADA4570SDZ Evaluation Software can be opened.

Uninstalling the Software

To uninstall the EVAL-ADA4570SDZ Evaluation Software, take the

following steps:

1. Launch the Uninstall Wizard by navigating to Start > Control

Panel > Programs and Features > EVAL-ADA4570SDZ to

open a window with the Uninstall button.

2. Click Uninstall.

3. Click Yes in the confirmation window that appears.

To uninstall the SDP drivers, adhere to the following steps:

1. Launch the Uninstall Wizard by navigating to Start > Control

Panel > Programs and Features > ADI SDP Drivers to open

a window with the Uninstall button.

2. Click Uninstall.

3. Click Yes in the confirmation window that appears.

User Guide EVAL-ADA4570

EVALUATION BOARD SOFTWARE

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STARTING THE EVALUATION GUI

To use the EVAL-ADA4570SDZ with the SDP controller board, start

by connecting the two boards together with the CON A connector of

the SDP.

When launching the GUI, the SDP controller board must be

recognized by the GUI before proceeding. The GUI automatically

searches for the SDP controller board and tries to read the EE-

PROM identification of the EVAL-ADA4570SDZ and to ensure that

the correct program is in use.

If the SDP controller board is not connected, or if the drivers are not

installed correctly, a Hardware Select window appears (see

Figure 16). If this occurs, ensure that the drivers are installed

correctly and that the PC recognizes the SDP controller board. Figure 16. Hardware Select Window

The Hardware Select window also appears when the EVAL-

ADA4570SDZ is not recognized or is not connected to the SDP

controller board. When the EVAL-ADA4570SDZ is detected, the

board appears preselected in the Hardware Select window. Click

Select to continue.

User Guide EVAL-ADA4570

EVALUATION BOARD SOFTWARE

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OVERVIEW OF THE MAIN ADA4570

EVALUATION SOFTWARE GUI WINDOW

Figure 17 shows the main EVAL-ADA4570SDZ GUI window when

starting the ADA4570 Evaluation Board Software.

Initially, all plots are blank, and the data capture is preset for data

acquisition of the differential VSIN and VCOS signals data capture.

Click Start to begin the data acquisition, and the Captured Data

window of the GUI displays the selected signals.

Figure 17. ADA4570 Evaluation Board Software (EVAL-ADA4570SDZ) Main Window

User Guide EVAL-ADA4570

EVALUATION BOARD SOFTWARE

analog.com Rev. 0 | 10 of 17

VSIN and VCOS Raw Outputs

The Captured Data graph shows measurement result in volts of

the selected outputs from the ADA4570 magnetic angle sensor (see

Figure 18).

Figure 18. Captured Data Graph

The red and blue waveforms in Figure 18 indicate the differential

signals of the selected VSIN channel and VCOS channel outputs

as the magnet rotates over the ADA4570. The VSIN and VCOS

differential signals output data is used to calculate the angle and

radius.

In the application, it is important that these two channels are

simultaneously sampled to avoid the introduction of errors resulting

in a phase delay between the sampling of the individual channels.

GUI Settings and Capture Modes

The GUI allows the user to change some settings that are accessed

via the system icon, Configure (see Figure 19).

Figure 19. Configure Icon

When the Configure icon is activated, the GUI opens a window

that allows the user to modify the captured data display settings,

data accusation and update rate settings, and the method the data

is captured. Figure 20 shows the GUI default settings.

Figure 20. Configure Window

The GUI provides two capture modes, Continuous and Burst.

When the EVAL-ADA4570SDZ operates in continuous capture

mode, the GUI constantly samples the VSIN channel and VCOS

channel. The number of samples displayed is set with the Chart

Length field and, by default, is set to 500 samples. The GUI

allows the user to set delays between sample reads via the Time

Between Bursts (s) field. The default delay is set to 10 ms.

After every sample read by the GUI, the Captured Data graph, the

angle, the radius, and the temperature values are updated.

When the EVAL-ADA4570SDZ operates in burst read mode, the

GUI samples a burst of samples, defined in the Samples to

Capture field, without updating the display. After the burst read has

finished, the GUI updates the display values with the collected data.

By default, the sampling frequency is set to 100,000 SPS.

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