Analog Devices IMEMS ADXL345 Manual de usuario

Evaluation Board User Guide

UG-065

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

iMEMS ADXL345/ADXL346 Inertial Sensor Datalogger and Development Board

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. A | Page 1 of 12

FEATURES

Ultralow power ADXL345/ADXL346 accelerometer

Inertial sensor development board

Datalogs onto MicroSD card

Fully programmable via serial interface; firmware examples

provided

Battery-powered for portable applications

REQUIREMENTS

2 AAA batteries

MicroSD card and card reader (for datalogging)

Computer with serial port (for programming)

08658-001

Figure 1. ADXL345 Inertial Sensor Development Board

GENERAL DESCRIPTION

It is often a timesaver in hardware development to make progress

on the firmware and the hardware simultaneously. The challenge is

that it proves difficult to develop firmware before the hardware

exists. The iMEMS® ADXL345/ADXL346 development board

is an easy-to-use tool that facilitates prototyping by providing

a platform that can be duplicated in the final application.

Additionally, the development board can be configured as a

datalogger and can be used to gather data for refining algorithms,

tuning thresholds, and generally familiarizing oneself with

accelerometer data.

Two AAA batteries power the development board, and thus it

integrates seamlessly into portable applications. Communications

and processing are done by an ARM7-based ADuC7024 micro-

controller, and the interface provided is fully reprogrammable.

Moreover, all ADuC7024 pins are broken out into headers to

facilitate design of compatible expansion boards. Data is logged

onto a MicroSD memory card, providing essentially unlimited

memory capacity and operating system versatility. Data is stored in

a text file; therefore, there is no need to install any software to

operate the board or read data. Software is provided to assist

with programming the board.

UG-065 Evaluation Board User Guide

Rev. A | Page 2 of 12

TABLE OF CONTENTS

Features .............................................................................................. 1

Requirements .................................................................................... 1

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

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

Overview............................................................................................ 3

Features.......................................................................................... 3

Using the Board ................................................................................ 4

Getting Started...............................................................................4

Programming the Board...............................................................4

Software Tools................................................................................5

Evaluation Board Schematic and Layout .......................................6

Appendix: Sample Output File ..................................................... 10

REVISION HISTORY

3/11—Rev. 0 to Rev. A

Added ADXL346 Throughout..........................................Universal

Changes to Firmware Section ......................................................... 3

Changes to Figure 7.......................................................................... 8

Changes to Figure 8.......................................................................... 9

Added Appendix............................................................................. 10

6/10—Revision 0: Initial Version

Evaluation Board User Guide UG-065

Rev. A | Page 3 of 12

OVERVIEW

The ADXL345/ADXL346 inertial sensor development board

has the following features:

•A 2-layer printed circuit board (PCB), 1.20 inches ×

2.30 inches form factor

•A two AAA battery power supply

•A 4-pin UART header to connect to an RS-232 interface

cable

•Reset/download push buttons

•Power indicator/general-purpose LEDs

•Access to microcontroller I/Os from the external header

•Demonstration firmware logs 100 Hz acceleration data

FEATURES

Power Supply

A pair of AAA batteries powers the board, and the battery holder is

located on the back of the board. An on/off switch on the lower

left of the front of the board controls power to it. The battery

voltage is not regulated but is decoupled with a 10 μF capacitor

globally and an additional 1 μF capacitor at the device supply

pins to ground.

RS-232 Interface

The ADuC7024 (UC1) P1.1 and P1.0 lines are connected to the

RS-232 interface cable via the connector (UART). The interface

cable generates the required level shifting to allow direct connection

to a PC serial port. Ensure that the supplied cable is connected

to the board correctly; that is, VDD is connected to VDD and

GND is connected to GND.

RESET/PROG Push Buttons

A RESET push button is provided to allow the user to manually

reset the part. When the RESET button is inserted, the RST pin

of the is pulled to GND. Because theADuC7024 RST pin is

Schmitt-triggered internally, there is no need to use an external

Schmitt trigger on this pin.

To enter serial download mode, the user must hold the P0.0/BM

pin low while reset is toggled. On the development board, serial

download mode can be easily initiated by holding down the serial

download push button (PROG) while inserting and releasing

the reset button (RESET), as illustrated in Figure 2.

Power Indicator/General-Purpose LEDs

Two general-purpose LEDs are available on the board. A red

LED (LED1) is connected to P4.5 of the ADuC7024, and a green

LED (LED2) is connected to P4.4. Both LEDs can be repurposed

via firmware.

Breakout Header

Many of the ADuC7024 pins are connected to headers on either

side of the board. The headers come unpopulated but can be

populated using standard 0.1 inch header pins.

The thin form factor of the top of the board allows the design

of an expansion board to connect above the development board,

with the header pins providing both electrical and physical

connections.

Firmware

Sample firmware is provided on the ADXL345 product page

under the Development Board heading. The Firmware

link downloads a Keil project that implements the 100 Hz

datalogging firmware. This project can be modified as needed.

08658-002

RESET PROG

(A) RESE

AND PROG RELEASED

RESET PROG

(E) RELEASE PROG

RESET PROG

(B) PUSH PROG

RESET PROG

(D) RELEASE RESET

PROG

RESET

Figure 2. Entering Serial Download Mode to Reprogram the Board

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USING THE BOARD

GETTING STARTED

The development board comes preprogrammed as a datalogger

at a 100 Hz datarate. To log data, do the following:

1. Insert two AAA batteries into the battery holder.

2. Insert the MicroSD card into the slot. The card should be

formatted with a FAT32 file system; most MicroSD cards

come this way.

3. Push the on/off switch to the on position to power up the

board. The red LED turns on, and the green LED blinks to

indicate that the board is logging data.

4. When logging is completed, slide the on/off switch to the

off position.

5. Remove the card from the slot and insert it into the card

reader.

6. Insert the card reader into the USB port on your computer.

The acceleration log file is written to the path

\XL345\DATA0000.TXT on the MicroSD card. The data in the

text file consists of a set of comma-separated t, x, y, and z values,

where t corresponds to time and x, y, and z correspond to the x-, y-,

and z-axis acceleration data for each time point. Refer to the

Appendix: Sample Output File for an example of a data file.

Acceleration values are logged in LSB, where the nominal scale

factor is 3.9 mg/LSB. To convert an acceleration value from LSB to

mg, simply multiply by 3.9 (nominally, or measure the sensitivity

of the part for a more accurate conversion).

To plot the logged data using Microsoft® Excel, download the

Plotting Tool (XL345DB_DataPlotter.xls) from the ADXL345

product page (under the Development Board heading) and

follow the instructions described in the file. Users are prompted

to browse to their logged data file (DATA0000.TXT), the data is

imported and plotted in a new workbook, and users are then

prompted to save that workbook.

PROGRAMMING THE BOARD

The board can be repurposed with no programming required

using the .hex files provided on the ADXL345 product page. The

.hex files are uploaded onto the board using the ARMWSD program,

which can be downloaded at www.analog.com/static/imported-

files/eval_boards/ARMWSDv1.8.zip. Simply unzip the folder to

a known location and open the ARMWSD.exe file to use the

program. No installation is required.

To reprogram the board, use the cable provided with the board and

follow these instructions:

1. Download the desired .hex file from the ADXL345 product

page to a known location, or locate it on your machine.

2. Open ARMWSD.

3. Click Configure… (see Figure 3) and select the Parts tab,

shown in Figure 4. Make sure the ADuC7024 is selected in

the Select Part pull-down list (see Figure 4). Additionally, in

the Comms tab, make sure the Baudrate is set to 115200,

and the Serial Port is set to COM1, and then click OK.

4. In the ARMWSD window, click Browse… (see encircled in

Figure 3) and navigate to the location of the .hex file to be

loaded onto the board. Select the file and click Open.

08658-003

Figure 3. ARMWSD Window

08658-005

Figure 4. ARMWSD Configure Window: Parts Tab

5. Connect the programming cable to the serial port on the

PC and to the 4-pin header near the on/off switch on

the board, matching up the corresponding pins.

6. In the ARMWSD window, click Start. The Status

frame then prompts users to Press Download and

pulse Reset on Hardware. Follow the illustrations in

Figure 2.

7. When download is complete, click the Reset button on

the evaluation board. Users can now close the

ARMWSD program.

Evaluation Board User Guide UG-065

Rev. A | Page 5 of 12

SOFTWARE TOOLS

In addition to the ready-to-upload examples provided in the

Firmware link of the Development Board section of the

ADXL345 product page, the development board is fully

modifiable and reprogrammable to allow for easy prototyping and

firmware development. Firmware is written in C, and it is compiled

for the ADuC7024 ARM7 processor.

The firmware examples provided on the ADXL345 product page

were written using Keil Microvision and compiled using the

RealView compiler. A free evaluation version of Keil Microvision

is available online. Additional software suites (Keil, IAR, and

GNU) for writing and compiling code are available.

For instructions on how to install and use the software,

refer to the ADuC702x MicroConverter™ GetStarted Guide.

To reprogram the board, download the ARMWSD program

from the Uploader link in the Development Board section of

the ADXL345 product page.

When Keil Microvision is installed, complete the following steps:

1. Click and download the Sample Project (EVAL-

ADXL345Z-DB Files.zip) file from the ADXL345

Development Board section of the ADXL345 product

page.

2. Unzip the EVAL-ADXL345Z-DB Files.zip file into a

known directory.

3. Navigate into the EVAL-ADXL345Z-DB folder and open

datalogger.uvproj. This Keil Microvision project allows

users to modify and recompile the program.

UG-065 Evaluation Board User Guide

Rev. A | Page 6 of 12

EVALUATION BOARD SCHEMATIC AND LAYOUT

See the appropriate product pages for electronic versions of the layout and schematic files.

08658-004

Figure 5. ADXL345 Development Board Schematic

Evaluation Board User Guide UG-065

Rev. A | Page 7 of 12

08658-006

Figure 6. ADXL345 Development Board Layout

UG-065 Evaluation Board User Guide

Rev. A | Page 8 of 12

08658-008

Figure 7. ADXL346 Development Board Schematic

Evaluation Board User Guide UG-065

Rev. A | Page 9 of 12

08658-008

Figure 8. ADXL346 Development Board Layout

UG-065 Evaluation Board User Guide

Rev. A | Page 10 of 12

APPENDIX: SAMPLE OUTPUT FILE

t,x,y,z

0,60,20,247

50,60,19,259

100,57,17,258

151,58,18,260

201,61,14,252

252,58,10,252

302,63,21,248

353,66,23,255

403,67,21,243

454,53,35,254

504,63,32,251

555,63,31,241

605,65,33,256

656,59,34,254

706,60,34,247

757,55,41,250

807,56,41,252

858,58,43,245

908,60,40,246

959,60,38,246

1009,66,37,249

1060,64,29,252

1110,69,36,251

1161,68,31,253

1211,66,47,233

1262,63,40,246

1312,59,36,246

1363,48,41,244

1413,49,41,248

1464,46,51,252

1514,52,39,264

1565,47,42,260

1576,47,43,254

1585,25,-5,263

1595,26,-2,263

1605,26,-5,257

1615,26,-4,257

1625,28,-3,258

1634,28,-1,261

1644,24,-2,263

1654,24,1,263

1664,25,0,261

1674,27,0,263

1683,24,-2,263

1693,22,-1,265

1703,23,-2,264

1713,22,0,265

1723,22,0,260

1732,22,-1,261

1742,23,0,258

1752,23,-1,259

1762,25,-1,256

1772,26,-1,256

1781,21,-2,257

1791,21,-4,256

1801,20,-4,259

1811,21,-2,260

1821,19,-5,260

1830,17,-4,258

1840,18,-3,260

1850,20,-5,260

1860,20,-2,260

1870,20,-2,261

1870,20,-2,264

1880,25,2,264

1890,23,2,262

1901,25,-1,260

1911,24,0,264

1922,27,1,263

1932,30,0,265

1942,30,2,265

1953,27,2,263

1963,28,1,263

1974,27,1,264

1984,29,0,261

1994,29,0,263

2005,27,0,261

2015,26,0,259

2026,28,-1,257

2036,26,-3,257

2046,27,-2,259

2057,23,-1,262

2067,24,-3,261

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