Analog Devices ADXRS450 Manual de usuario

Evaluation Board User Guide

ADXRS450 - UG

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

ADXRS450 Sensor Evaluation System

Please see the last page for an important warning and disclaimers. Rev. 0 | Page 1 of 17

FEATURES

Flexible inertial sensor evaluation platform

-Single main board operates with interchangeable

satellite boards

Separates DUT from controller for accurate environmental

testing

500Hz data rate SPI interface

Continuous stream to file data recording

Standard USB cable for power and communications

PC-based graphical user interface (GUI)

Fast, easy installation

Figure 1. Inertial Sensor Evaluation System

GENERAL DESCRIPTION

The ADXRS450 inertial sensor evaluation system

is an easy-to-use evaluation tool targeting bench or desktop

characterization of Analog Devices, Inc., inertial sensor products.

The system consists of the inertial sensor evaluation board (ISEB),

or main board, and a satellite board for any Analog Devices

inertial sensor product. The ISEB connects directly to a PC via

USB cable, with the USB connection providing both power and

communications to the board. The ISEB is connected to the

satellite board through a ribbon cable. This cable allows the

satellite to be easily manipulated for testing or for being separately

placed into an environmental chamber for temperature or

humidity testing. Separating the boards mitigates corruption

of data due to the temperature and humidity effects of other

components.

The ISEB is a universal main board and is intended to be used

with various satellites of Analog Devices inertial sensors, including

analog and digital accelerometers, as well as gyroscopes. The

different products are evaluated by means of separate GUIs that are

customized for performance and characterization measurements

relevant to the inertial sensor being evaluated.

The EVAL-ADXRS450Z-M system contains the ISEB and the

E VA L-ADXRS450Z-S satellite. Also included is a USB A to

Mini-B cable to connect the ISEB to a PC and an 18-inch,

20-pin ribbon cable to connect the ISEB to the satellite. A CD

is included with the necessary drivers and installers to use the

system and to quickly begin evaluating the ADXRS450.

INSTALLATION OVERVIEW

The user must complete the following steps, in the order listed,

in order to be successfully up and running with the ADXRS450

evaluation system.

1. Download all CD-ROM files to the PC Hard Drive

2. Install the USB drivers for the Inertial Sensor

Evaluation System (ISEB)

3. Connect the ISEB hardware to the PC

4. Install the latest Firmware Revision into the ISEB

hardware (included on the CD-ROM)

5. Install the ADXRS450 Evaluation System GUI

6. Configure the ISEB hardware

7. Launch the ADXRS450 Evaluation System GUI and

test devices.

This guide is designed to provide all the detail necessary to both

install and operate the ADXRS450 Evaluation system.

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TABLE OF CONTENTS

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

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

Installation Overview................................................................... 1

Revision History ............................................................................... 2

Inertial Sensor Evaluation System Setup....................................... 3

Software Configuration ............................................................... 3

Hardware Configuration ............................................................. 4

Updating/Repairing the ISEB Firmware ................................... 5

Inertial Sensor Evaluation System Graphical User Interface...... 8

Getting Started.............................................................................. 8

View and Record Data..................................................................9

Temperature Test........................................................................ 10

Noise and Root Allan Variance ................................................ 11

Turn -on Bias Stability ................................................................ 12

Turn -on Bias Settling ................................................................. 13

Sensitivity Check ........................................................................ 14

Alternate External High Voltage Supply ................................. 15

Header Pinout ................................................................................. 16

ESD Caution................................................................................ 16

REVISION HISTORY

4/10 – Rev 1

Minor updates to the installation routine

12/09 – Initial Revision

Evaluation Board User Guide ADXRS450 - UG

Rev. 0 | Page 3 of 17

INERTIAL SENSOR EVALUATION SYSTEM SETUP

DOWNLOAD ALL FILES TO PC

Before proceeding with the installation routine, it is important

to first download all files included on the ADXRS450

installation CD-ROM to a local folder on the host PC. Browse

to a destination directory on the host PC and right click in

order to select New -> Folder. Name this folder, and then copy

the CD-ROM files into this new location. The user is now

ready to begin the installation routine.

ISEB HARDWARE SETUP

Before connecting the ISEB hardware to the PC via the included

USB cable, drivers need to be installed so that the PC will

properly recognize the ISEB main board. The USB drivers for

the ISEB are available in the /ISEB_USB/ folder on the

packaged CD.

Installing the USB Drivers for the ISEB

To install the USB drivers, follow these steps.

1. Execute the ADI_ISEB_USB_Drivers.exe file located in

/ISEB_USB/.

2. Follow the on-screen instructions to install the drivers.

3. Click Continue Anyway when prompted that the drivers

are not tested.

Once the above steps have been completed, the user can now

connect the ISEB main board to the computer via the included

USB cable. Once connected, if the previously installed drivers

are not automatically associated with the device, then the user

may need to select the drivers manually. Refer to the following

steps if this action is required.

1. Connect the USB A to Mini-B cable to the PC and then to

the ISEB. The satellite board does not need to be connected

for this step. New hardware is detected upon completion of

this step.

2. If prompted to install drivers again, click Install from a list

or specific location (Advanced), see Figure 2, then click

Next.

Figure 2. Found New Hardware Prompt

3. Select Don’t search. I will choose the driver to install (see

Figure 3) and click Next

4. Select ADI Inertial Sensor Evaluation System from the

model list (see Figure 4) and click Next to complete the

process

The ISEB should be detected automatically in the Device

Manager as the ADI Inertial Sensor Evaluation System under

the Ports (COM & LPT) selection. It is recommended to open

the Device Manager to verify hardware detection and to record the

communication port associated with the ISEB for use in the GUI.

Figure 3. Selection of the Driver to Install

Figure 4. Selection of the ADI Inertial Sensor Evaluation System Drivers

08119-002

08119-003

08119-004

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COM PORT VERIFICATION

Installing the latest Firmware revision, as well as operating the

ADXRS450 Evaluation GUI will require that the user know the

communications port which has been assigned to the ISEB

main board. With the ISEB main board connected to the PC,

the user should perform the following steps to determine the

assigned COM port number:

For Windows Vista:

1. From the start menu, right click on “Computer” and

select “Properties”

a. This should open the window shown in Figure 9

2. Underneath the “Tasks” heading, select “Device

Manager”

a. Windows Vista may request that the user allow

access to this panel, and Administrative privileges

may be required.

b. The window shown in XYZ should now open

3. Expand the “Ports (COM & LTP)” menu item

a. The “ADI Inertial Sensor Evaluation System”

should be listed with an assigned COM port

number in parenthesis.

4. Note this value for future use

Figure 5: Computer Properties

Figure 6: Device Manager, showing the COM Port number

For Windows XP/2000:

1. From the Start Menu, right click on “My Computer”

and select “Properties”.

2. Click on the “Hardware” tab of the “System

Properties” window as shown in Figure 11.

3. Select “Device Manager” to look-up the assigned

COM port of the ISEB hardware

a. The Device Manager window should be

similar to that presented in Figure 10

Figure 7: System Properties

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UPDATING/REPAIRING THE ISEB FIRMWARE

In the event that the ISEB firmware becomes corrupted or must

be updated, the CD contains the necessary programming utility to

flash the ISEB microcontroller. Also available on the CD is the

version of firmware available at the time of release of the EVAL-

ADXRS450Z-M system (Version 2.0). In addition, as new firmware

is made available, it can be downloaded from the Analog Devices

website (www.analog.com).

To flash the ISEB microcontroller, follow these steps.

1. Ensure that the ISEB is connected to and detected by the

PC. The COM port that the device is recognized on must

also be obtained, as mentioned in the previous sections.

2. Run the ARMWSD.exe program located in the

/ISEB_USB/FW/ folder, which displays information about

the downloader, as shown in Figure 10.

Figure 8. ISEB ARMWSD Firmware Downloader

3. Click Browse… and select the ADI_ISEB_FW_2_0.hex

file located in the /ISEB_USB/FW/ folder or the most

recent firmware obtained from the Analog Devices website

(www.analog.com).

4. Click Configure to display the screen shown in Figure 11.

The downloader file should come configured for the ADuC7026

microcontroller on the ISEB. The only option that may need to

be changed is to select the correct COM port from the Serial

Port menu on the Comms tab (see Figure 11). When the COM

port is selected, click OK to accept the changes and go back to

the main screen.

Figure 9. Selecting the Correct COM Port for the Downloader

When the ISEB is connected, the correct firmware is selected,

and the downloader is fully configured, follow these steps to

flash the firmware.

1. Click Start, as shown in Figure 10, to initiate the flashing

process. After clicking Start, the two buttons on the ISEB

shown in Figure 12 must be pressed, in a specific order, to

flash the firmware.

Figure 10. ISEB Switch Locations for Flashing the Microcontroller

2. Press and hold down SW1.

3. With SW1 held down, press and release SW2.

4. Release SW1.

The download then begins and is automatically verified by

the downloader. If the downloading process fails, which will be

indicated in the Monitor Status box (see Figure 10), attempt the

download again by clicking Start and then the appropriate switch

combination. It may take a few attempts to reprogram the board

successfully.

After the download is completed successfully, click Run, as shown

in Figure 10, to reset the ISEB and to begin running the new firm-

ware. When this step is complete, the board is updated correctly.

Updating the firmware may require that a new evaluation GUI

be obtained. If the firmware on the CD is used to flash the ISEB,

the evaluation GUI on the corresponding CD is sufficient. If the

firmware used is obtained from the Analog Devices website

(www.analog.com), the most recent version of the evaluation

GUI, which is also located on the website, should be used.

08119-107

08119-108

08119-109

ADuC7026

CONNECTOR

SW1 SW2

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Installing the ADXRS450 Software Evaluation GUI

The software GUI installation has been created to include any

required National Instruments drivers and run-time engines

which are necessary for proper operation. In order to run the

software GUI installation routine, double click on the

“setup.exe” file located in the /ADXRS450 Evaluation

Software/ folder on the included CD. The user will be greeted

with the following screen:

Figure 11: ADXRS450 evaluation software installation welcome screen

From this point, the following steps should be completed in

order to successfully install the evaluation software.

1. Select the destination directory. The installer will auto-

populate the directory names where it would like to store

the software GUI and required National Instruments

products (Figure 6). These directories can be changed by

the user, if desired, however most installations can proceed

with the default values. Click Next.

2. License Agreement.Once the installation directories have

been chosen, the user will be prompted with the National

Instruments Software License Agreement. It is highly

recommended that the user read this agreement before

accepting, and clicking the Next button.

3. Start Installation. The installer will then list the required

components which need to be installed on the user’s PC

(Figure 7). Click Next.

4. Installation Complete.The installer will now complete

the installation of the software evaluation GUI and all

required National Instruments drivers and run-time

engines. After the installation is complete, the user will see

the screen shown in Figure 8. Click Finish to complete the

installation.

Figure 12: Destination Directory Selection

Figure 13: Start Installation screen (Note: depending on the requirements of

each PC, the components listed above may be different)

Figure 14: Installation Complete!

Evaluation Board User Guide ADXRS450 - UG

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HARDWARE CONFIGURATION

To configure the hardware, follow these steps:

1. If not already connected, plug the USB A to Mini-B cable

into the PC.

2. Connect the ISEB to the USB cable.

If prompted to install the device, see the Software

Configuration section for details on how to install and

select the correct driver.

3. Ensure that the jumpers on the ADXRS450 satellite are in

their default configuration, as shown in Figure 9. This will

setup the board to use the on-board boost converter to

generate the device’s required high voltage supply. For

more information on using alternate high voltage supplies,

refer to the ADXRS450 datasheet as well as the Alternate

External High Voltage Supply section of this document.

Figure 15: Default Jumper Positions

4. Connect the ISEB to the ADXRS450 satellite using the

18-inch, 20-pin ribbon cable. This cable is keyed to prevent

inserting it backwards and causing damage to the system.

5. Connect the ADXRS450 satellite to the opposite end of the

ribbon cable.

The inertial sensor evaluation system should now be set up and

ready to use, and should resemble the setup shown in Figure 9.

Figure 16: Fully assembled evaluation Kit

Analog Devices

ADXRS800Satellite

Connector

Default

Jumper

Positions

ADXRS450 - UG Evaluation Board User Guide

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INERTIAL SENSOR EVALUATION SYSTEM GRAPHICAL USER INTERFACE

GETTING STARTED

Figure 17: ADXRS450 Evaluation GUI Startup Screen

Before running the software evaluation GUI, it is a good idea to

reset the ISEB by pressing the SW2 button described in the

previous section. This will remove any errors which could be

lingering due to an improper shutdown or disconnection from

the PC.

After the completion of the Software GUI installation routine, a

shortcut to launch the executable will be added to the PC’s start

menu. To launch the evaluation GUI, simply click on Start >

All Programs > ADXRS450 Evaluation Software > ADXRS450

Eval. The user should then be shown a similar screen as that

presented in Figure 14.

At this point the functionality of the GUI is completely

deactivated. Before testing any devices, the user must associate

the software GUI with the previously installed hardware

through the COM port. Refer to the PC’s Device Manager,

under the Ports (COM & LTP) submenu in order to determine

which COM port has been assigned to the ADI Inertial Sensor

Evaluation System. Select this COM port from the drop down

menu, and click “Confirm COM” to begin using the GUI.

Once the COM port is confirmed, the full functionality of the

software evaluation GUI will become available to the user. The

following sections will detail the intent of each panel of the

GUI. The user can exit the GUI at any time by pressing the

Quit Program button located in the lower right of the window.

Important Note: Do not press the reset button (SW2) while the

GUI is running. This will result in the ISEB and the Software

GUI losing sync, and the evaluation system will no longer

function properly. Additionally, if for any reason the ISEB board

and the software evaluation GUI do not appear to be properly

communicating, the following reset routine should be performed:

1. Close the software GUI by pressing the “QUIT

PROGRAM” button or by selecting File -> Exit.

2. With the Software GUI closed, reset the ISEB evaluation

board by pressing the reset button (SW2).

3. Restart the software GUI

Evaluation Board User Guide ADXRS450 - UG

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VIEW AND RECORD DATA

Figure 18: View and Record Data Panel

The View and Record Data panel is the primary panel for

interacting with the device. The pull down menu, located

beneath the graph, contains three options

1. Do Nothing (the default option)

2. View Gyro Signals

3. Record Gyro Signals

View Gyro Signals will obtain the Rateout, Filtered Self Test,

UnFiltered Self Test, and Quadrature information from the

device, and plot all four signals simultaneously. As indicated by

the GUI, the data rate at which this information is obtained is

500Hz ±5%. The data rate is hardware controlled so as to

remain constant regardless of the priority and processor load

assigned to the software GUI by the operating system.For

more information on the significance of the plotted signals,

refer to the ADXRS450 Datasheet.

Record Gyro Signals performs the same basic function as View

Gyro Signals, however it allows the user to continuously stream

the data to a *.txt file. This is useful for recording the response

of the part during short term events less than ~2 minutes. This

ensures that the resulting data file is manageable across most

data analysis software packages. However, the record

functionality can be performed indefinitely if desired by the

user.

Secondary information which is transmitted along with the

plotted signals is graphically represented to the user. This

includes the fault register, sequence bits, status bits and sensor

module bits. This information is described in detail in the

ADXRS450 datasheet. This information is also recorded

alongside the plotted signals when the user selects Record Gyro

Signals.

Additional functionality on this panel includes the ability to

change the supply voltage, read the device ID and serial

number, read the individual memory registers, and perform

offset adjustments in order to zero out any residual offset. This

encompasses the majority of the functionality of the ADXRS450

gyroscope.

Adjusting the Supply Voltage

The ADXRS450 has been designed to operate over the full

voltage range of 3.3V to 5V (±5%). The device has been

designed to offer equivalent performance, regardless of the

voltage level available in the application. The numeric control

allows the customer to adjust the voltage to reflect the voltage

level available in their application. Clicking the “Set” button

will update the voltage supplied to the ADXRS450 satellite

board. The Voltage Readback field accurately displays the

satellite supply voltage, as it could be slightly different than the

value in the numeric control.

ADXRS450 - UG Evaluation Board User Guide

Rev. 0 | Page 10 of 17

TEMPERATURE TEST

Figure 19: Temperature Test Panel

The next panel is designed to let the user easily perform long

term testing at a reduced bandwidth and data rate. The panel is

specifically designed for temperature testing, with the on board

temperature sensor output plotted alongside the device’s

RateOut, Filtered Self Test and Quadrature. Each data point is

comprised of an average of 250samples, gathered at a 500Hz

data rate, resulting in a 2Hz data rate from the device. The user

is able to both view and record this information, in much the

same way as the “View and Record” panel allowed. Data is

again streamed to a file, to allow for an indefinite length for data

recording.

Before recording the data on this panel, if the user wishes to

adjust for any null offset components, then this option is again

made available to the user. Note that any offset correction made

to the ADXRS450 is stored in the device’s EEPROM indefinitely,

or until over written with a subsequent correction value. In this

sense, any null offset corrections made on the View and Record

Data panel will persist throughout the remainder of the

evaluation GUI, even as the device is power cycled.

Supplemental information, including the fault register, sequence

bits, and status bits are all graphically indicated to the user, and

are recorded in addition to the plotted information when the

user opts to record the data.

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