3-Axis, 2 g/4 g/8 g/16 g Digital MEMS Accelerometer Data Sheet ADXL343 FEATURES GENERAL DESCRIPTION Multipurpose accelerometer with 10- to 13-bit resolution for The ADXL343 is a versatile 3-axis, digital-output, low g MEMS use in a wide variety of applications accelerometer. Selectable measurement range and bandwidth, and 2 Digital output accessible via SPI (3- and 4-wire) and I C configurable, built-in motion detection make it suitable for sensing Built-in motion detection features make tap, double-tap, acceleration in a wide variety of applications. Robustness to activity, inactivity, and free-fall detection trivial 10,000 g of shock and a wide temperature range (40C to +85C) User-adjustable thresholds enable use of the accelerometer even in harsh environments. Interrupts independently mappable to two interrupt pins The ADXL343 measures acceleration with high resolution (13-bit) Low power operation down to 23 A and embedded FIFO for measurement at up to 16 g. Digital output data is formatted as reducing overall system power 16-bit twos complement and is accessible through either an SPI Wide supply voltage range: 2.0 V to 3.6 V 2 (3- or 4-wire) or I C digital interface. The ADXL343 can I/O voltage 1.7 V to V S measure the static acceleration of gravity in tilt-sensing appli- Wide operating temperature range (40C to +85C) cations, as well as dynamic acceleration resulting from motion 10,000 g shock survival or shock. Its high resolution (3.9 mg/LSB) enables measurement Small, thin, Pb free, RoHS compliant 3 mm 5 mm 1 mm of inclination changes less than 1.0. LGA package Several special sensing functions are provided. Activity and APPLICATIONS inactivity sensing detect the presence or lack of motion. Tap sensing detects single and double taps in any direction. Free-fall Handsets sensing detects if the device is falling. These functions can be Gaming and pointing devices mapped individually to either of two interrupt output pins. Hard disk drive (HDD) protection An integrated memory management system with a 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. The ADXL343 is supplied in a small, thin, 3 mm 5 mm 1 mm, 14-terminal, plastic package. FUNCTIONAL BLOCK DIAGRAM V V S DD I/O ADXL343 POWER MANAGEMENT INT1 CONTROL SENSE ADC AND DIGITAL ELECTRONICS INTERRUPT FILTER 3-AXIS LOGIC INT2 SENSOR SDA/SDI/SDIO 32 LEVEL SERIAL I/O FIFO SDO/ALT ADDRESS SCL/SCLK GND CS Figure 1. Rev. 0 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. 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All rights reserved. 10627-001ADXL343 Data Sheet TABLE OF CONTENTS Self-Test ....................................................................................... 20 Features .............................................................................................. 1 Register Map ................................................................................... 21 Applications ....................................................................................... 1 Register Definitions ................................................................... 22 General Description ......................................................................... 1 Applications Information .............................................................. 26 Functional Block Diagram .............................................................. 1 Power Supply Decoupling ......................................................... 26 Revision History ............................................................................... 2 Mechanical Considerations for Mounting .............................. 26 Specifications ..................................................................................... 3 Tap Detection .............................................................................. 26 Absolute Maximum Ratings ............................................................ 5 Threshold .................................................................................... 27 Thermal Resistance ...................................................................... 5 Link Mode ................................................................................... 27 Package Information .................................................................... 5 Sleep Mode vs. Low Power Mode............................................. 28 ESD Caution .................................................................................. 5 Offset Calibration ....................................................................... 28 Pin Configuration and Function Descriptions ............................. 6 Using Self-Test ............................................................................ 29 Typical Performance Characteristics ............................................. 7 Data Formatting of Upper Data Rates ..................................... 30 Theory of Operation ...................................................................... 11 Noise Performance ..................................................................... 31 Power Sequencing ...................................................................... 11 Operation at Voltages Other Than 2.5 V ................................ 31 Power Savings.............................................................................. 12 Offset Performance at Lowest Data Rates ............................... 32 Serial Communications ................................................................. 13 Axes of Acceleration Sensitivity ............................................... 33 SPI ................................................................................................. 13 2 Layout and Design Recommendations ................................... 34 I C ................................................................................................. 16 Outline Dimensions ....................................................................... 35 Interrupts ..................................................................................... 18 Ordering Guide .......................................................................... 35 FIFO ............................................................................................. 19 REVISION HISTORY 4/12Revision 0: Initial Version Rev. 0 Page 2 of 36