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Analog Devices Semiconductor Electronic Components Datasheet

ADXL346 Datasheet

Digital Accelerometer

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ADXL346 pdf
Preliminary Technical Data
Three-Axis, ±2 g/±4 g/±8 g/±16g
Digital Accelerometer
ADXL346
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Ultralow power: 25 µA to 145 µA at VS = 1.8 V (typ)
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)
32 levels of output data FIFO minimizes host processor load
Tap/double tap detection
Activity/inactivity monitoring
Free-fall detection
4- and 6-position orientation sensing
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—any interrupt 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 × 1 mm LGA package
APPLICATIONS
Handsets
Gaming and pointing devices
Personal navigation devices
Hard disk drive (HDD) protection
Fitness equipment
Digital cameras
GENERAL DESCRIPTION
The ADXL346 is a small, thin, low power, three-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 a 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 as little as 0.25°.
Several special sensing functions are provided. Activity and
inactivity sensing detect the presence or lack of motion and if
the acceleration on any axis exceeds a user-set level. Tap sensing
detects single and double taps. Free-fall sensing detects if the
device is falling. These functions can be mapped to one of two
interrupt output pins. An integrated 32-level first in, first out
(FIFO) buffer can be used to store data to minimize host
processor intervention. Both 4- and 6-position orientation
sensing are available for 2- and 3-D applications.
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 ×
1 mm, 16-lead, plastic package.
FUNCTIONAL BLOCK DIAGRAM
VS VDD I/O
AADDXXL3465
POWER
MANAGEMENT
3-AXIS
SENSOR
SENSE
ELECTRONICS
ADC
DIGITAL
FILTER
CONTROL
AND
INTERRUPT
LOGIC
INT1
INT2
32 LEVEL
FIFO
SERIAL I/O
SDA/SDI/SDIO
SDO/ALT
ADDRESS
SCL/SCLK
GND
CS
Figure 1.
Rev. PrA
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

ADXL346 Datasheet

Digital Accelerometer

No Preview Available !

ADXL346 pdf
ADXL346
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
wwGwe.ndeartaalshDeeestc4rui.pctoiomn ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ........................................................................ 9
Power Sequencing ........................................................................ 9
Power Savings................................................................................ 9
Serial Communications ................................................................. 11
SPI................................................................................................. 11
I2C ................................................................................................. 13
Preliminary Technical Data
Interrupts..................................................................................... 14
FIFO ............................................................................................. 14
Self-Test ....................................................................................... 15
Register Map ................................................................................... 16
Register Definitions ................................................................... 17
Applications Information .............................................................. 22
Power Supply Decoupling ......................................................... 22
Mechanical Considerations for Mounting.............................. 22
Tap Detection.............................................................................. 22
Tap Sign ....................................................................................... 23
Threshold .................................................................................... 23
Link Mode ................................................................................... 24
Orientation Sensing ................................................................... 24
Layout and Design Recommendations ................................... 25
Outline Dimensions ....................................................................... 26
Ordering Guide .......................................................................... 26
Rev. PrA | Page 2 of 26


Part Number ADXL346
Description Digital Accelerometer
Maker Analog Devices
Total Page 26 Pages
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