3-Axis, ± ± g/± ꢀ g/± ꢁ g/± ꢂ1 g
Ultralow Power Digital Accelerometer
ADXL3ꢀ1
FEATURES
GENERAL DESCRIPTION
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
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.
Fixed 10-bit resolution
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°.
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)
Patent pending, embedded memory management system
with FIFO technology minimizes host processor load
Single-tap/double-tap detection
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, patent pending
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.
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
Low power modes enable intelligent motion-based power
management with threshold sensing and active acceleration
measurement at extremely low power dissipation.
APPLICATIONS
Handsets
The ADXL346 is supplied in a small, thin, 3 mm × 3 mm ×
0.95 mm, 16-lead, plastic package.
Medical instrumentation
Gaming and pointing devices
Industrial instrumentation
Personal navigation devices
Hard disk drive (HDD) protection
FUNCTIONAL BLOCK DIAGRAM
V
V
DD I/O
S
ADXL346
POWER
MANAGEMENT
INT1
INT2
CONTROL
AND
INTERRUPT
LOGIC
SENSE
ELECTRONICS
ADC
DIGITAL
FILTER
3-AXIS
SENSOR
SDA/SDI/SDIO
32-LEVEL
FIFO
SERIAL I/O
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
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 registeredtrademarks arethe property of their respective owners.
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
©2010 Analog Devices, Inc. All rights reserved.
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