Analog Devices iMEMS ADXL345 User Manual
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Analog Devices iMEMS ADXL345 User Manual

Analog Devices iMEMS ADXL345 User Manual

Inertial sensor evaluation system
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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 Inertial Sensor Evaluation System

FEATURES

Ultralow power
ADXL345
accelerometer
Inertial sensor evaluation board
Inertial sensor-specific satellite for evaluation
Standard USB cable for power and communications
PC-based graphical user interface (GUI)
Separates DUT from controller for accurate environmental
testing

GENERAL DESCRIPTION

The iMEMS® ADXL345 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
its USB, where the USB connection provides both power and
communications to the board. The ISEB then connects 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.
Please see the last page for an important warning and disclaimers.
Evaluation Board User Guide
Figure 1. Inertial Sensor Evaluation System
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-ADXL345Z-M system contains the ISEB and the
EVAL-ADXL345Z-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 also included with the necessary drivers and executables to
use the system and to quickly begin evaluating the ADXL345.
Rev. 0 | Page 1 of 12
UG-015

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Summary of Contents for Analog Devices iMEMS ADXL345

  • Page 1: Features

    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 its USB, where the USB connection provides both power and communications to the board.

  • Page 2: Table Of Contents

    UG-015 TABLE OF CONTENTS Features ... 1 General Description ... 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 ... 6 REVISION HISTORY 6/09—Revision 0: Initial Revision Evaluation Board User Guide...

  • Page 3: Inertial Sensor Evaluation System Setup

    Evaluation Board User Guide INERTIAL SENSOR EVALUATION SYSTEM SETUP SOFTWARE CONFIGURATION Software configuration of the inertial sensor evaluation system involves installation of USB drivers for the ISEB and National Instruments LabVIEW® Run-Time and NI-VISA™ Run-Time files. These are available in the /Drivers/ folder on the packaged CD. Installing the USB Drivers for the ISEB To install the USB drivers, follow these steps.

  • Page 4: Hardware Configuration

    ADXL345 SOCKET PIN 1 INDICATOR Figure 6. Location of Pin 1 Indicators for the ADXL345 Accelerometer and Socket The inertial sensor evaluation system should now be set up and ready to use. Rev. 0 | Page 4 of 12...

  • Page 5: Updating/Repairing The Iseb Firmware

    EVAL- ADXL345Z-M system (Version 1.3). 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.

  • Page 6: Inertial Sensor Evaluation System Graphical User Interface

    Clicking the round button above Vs Set causes the supply voltage, V , of the ADXL345 to be updated based on the value in the Desired Vs [V] box. The Current [μA] and Temp [degC] boxes are also updated whenever the Vs Set button is clicked.

  • Page 7: Real-Time Measurement Tab

    Deselecting this checkbox places the part into fixed 10-bit mode. For more information about the operation of the part, refer to the ADXL345 data sheet. The Self Test button toggles the self-test bit of the ADXL345.

  • Page 8: Interrupt Configuration Tab

    The indicators for ACT_INACT_CTL and TAP_AXIS are used to select the axes to include in activity, inactivity, and tap events. For more details, refer to the ADXL345 data sheet. Clicking an indicator causes it to toggle values. A lit indicator causes a value of 1 to be written to that bit, and an unlit indicator causes a value of 0 to be written to that bit.

  • Page 9: Power Consumption Tab

    TIME_INACT [s] box, the accelerometer is placed into a lower data rate as set in the Inactive Data Rate [Hz] menu. Because the power of the ADXL345 is modulated with data rate, an immediate power savings is acheived. When activity is...

  • Page 10: Temperature Tab

    UG-015 TEMPERATURE TAB The Temperature tab is used to examine the performance of the ADXL345 over temperature. By plotting the acceleration vs. temperature while the ADXL345 is not experiencing dynamic acceleration, the offset temperature coefficient can be determined by taking the slope of the best-fit line to the acceleration vs.

  • Page 11: Header Pinout

    Evaluation Board User Guide HEADER PINOUT 3.3V AGND ESD CAUTION SCL1 SDA1 Figure 16. ISEB 20-Pin Header Pinout Rev. 0 | Page 11 of 12 MOSI MISO SCL1 SDA1 MOSI MISO UG-015...
  • Page 12 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Analog Devices reserves the right to change devices or specifications at any time without notice.

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