Ultralow Power Digital Accelerometer Data Sheet ADXL346 Ultralow Power Digital Accelerometer Data Sheet

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  • 3-Axis, ±2 g/±4 g/±8 g/±16 g Ultralow Power Digital Accelerometer

    Data Sheet ADXL346

    Rev. C Document Feedback 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. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

    One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2010–2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com

    FEATURES Ultralow power: as low as 23 μA in measurement mode and

    0.2 μA in standby mode at VS = 2.6 V (typical) Power consumption scales automatically with bandwidth User-selectable resolution

    Fixed 10-bit resolution Full resolution, where resolution increases with g range,

    up to 13-bit resolution at ±16 g (maintaining 4 mg/LSB scale factor in all g ranges)

    Embedded memory management system with FIFO technology minimizes host processor load

    Single tap/double tap detection Activity/inactivity monitoring Free-fall detection Concurrent four- and six-position orientation detection Supply and I/O voltage range: 1.7 V to 2.75 V SPI (3- and 4-wire) and I2C digital interfaces Flexible interrupt modes mappable to either interrupt pin Measurement ranges selectable via serial command Bandwidth selectable via serial command Wide temperature range (−40°C to +85°C) 10,000 g shock survival Pb free/RoHS compliant Small and thin: 3 mm × 3 mm × 0.95 mm LGA package

    APPLICATIONS Handsets Medical instrumentation Gaming and pointing devices Industrial instrumentation Personal navigation devices Hard disk drive (HDD) protection

    GENERAL DESCRIPTION The ADXL346 is a small, thin, ultralow power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16 g. Digital output data is formatted as 16-bit twos complement and is acces- sible through either an SPI (3- or 4-wire) or I2C digital interface.

    The ADXL346 is well suited for mobile device applications. It measures the static acceleration of gravity in tilt-sensing appli- cations, as well as dynamic acceleration resulting from motion or shock. Its high resolution (4 mg/LSB) enables measurement of inclination changes of less than 1.0°.

    Several special sensing functions are provided. Activity and inactivity sensing detect the presence or lack of motion by comparing the acceleration on any axis with user-set thresholds. Tap sensing detects single and double taps in any direction. Free- fall sensing detects if the device is falling. Orientation detection is capable of concurrent four- and six-position sensing and a user-selectable interrupt on orientation change for 2D or 3D applications. These functions can be mapped individually to either of two interrupt output pins. An integrated memory management system with 32-level first in, first out (FIFO) buffer can be used to store data to minimize host processor activity and lower overall system power consumption.

    Low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation.

    The ADXL346 is supplied in a small, thin, 3 mm × 3 mm × 0.95 mm, 16-lead, plastic package.

    FUNCTIONAL BLOCK DIAGRAM

    3-AXIS SENSOR

    SENSE ELECTRONICS DIGITAL

    FILTER

    ADXL346 POWER MANAGEMENT

    CONTROL AND

    INTERRUPT LOGIC

    SERIAL I/O

    INT1

    VS VDD I/O

    INT2

    SDA/SDI/SDIO SDO/ALT ADDRESS SCL/SCLK

    GND

    ADC

    32-LEVEL FIFO

    CS

    08 16

    7- 00

    1

    Figure 1.

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  • ADXL346 Data Sheet

    TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5

    Thermal Resistance ...................................................................... 5 Package Information .................................................................... 5 ESD Caution .................................................................................. 5

    Pin Configuration and Function Descriptions ............................. 6 Typical Performance Characteristics ............................................. 7 Theory of Operation ...................................................................... 12

    Power Sequencing ...................................................................... 12 Power Savings ............................................................................. 13

    Serial Communications ................................................................. 14 SPI ................................................................................................. 14 I2C ................................................................................................. 17 Interrupts ..................................................................................... 19 FIFO ............................................................................................. 20 Self-Test ........................................................................................ 21

    Register Map .................................................................................... 22

    Register Definitions ................................................................... 23 Applications Information .............................................................. 29

    Power Supply Decoupling ......................................................... 29 Mechanical Considerations for Mounting .............................. 29 Tap Detection .............................................................................. 29 Improved Tap Detection ............................................................ 30 Tap Sign ....................................................................................... 30 Threshold .................................................................................... 31 Link Mode ................................................................................... 31 Sleep Mode vs. Low Power Mode............................................. 31 Offset Calibration ....................................................................... 31 Using Self-Test ............................................................................ 32 Orientation Sensing ................................................................... 32 Data Formatting of Upper Data Rates ..................................... 34 Noise Performance ..................................................................... 35 Operation at Voltages Other Than 2.6 V ................................ 36 Offset Performance at Lowest Data Rates ............................... 36 Axes of Acceleration Sensitivity ............................................... 37 Layout and Design Recommendations ................................... 38

    Outline Dimensions ....................................................................... 39 Ordering Guide .......................................................................... 39

    REVISION HISTORY 6/15—Rev. B to Rev. C Changes to Features Section and General Description Section .......................................................................... 1 Change to Figure 36 ....................................................................... 14 Change to FIFO Section ................................................................ 20

    5/11—Rev. A to Rev. B Added Endnote 7 .............................................................................. 3 Added Preventing Bus Traffic Errors Section ............................. 14 Changes to Figure 37, Figure 38, Figure 39 ................................. 15 Changes to Table 12 ........................................................................ 18 Changes to Using Self-Test Section .............................................. 32 Changes to Axes of Acceleration Sensitivity Section ................. 37

    11/10—Rev. 0 to Rev. A Changes to Ordering Guide .......................................................... 39

    5/10—Revision 0: Initial Version

    Rev. C | Page 2 of 40

  • Data Sheet ADXL346

    Rev. C | Page 3 of 40

    SPECIFICATIONS TA = 25°C, VS = 2.6 V, VDD I/O = 1.8 V, acceleration = 0 g, CS = 10 μF tantalum, CI/O = 0.1 μF, ODR = 800 Hz, unless otherwise noted.

    Table 1. Specifi

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