3-Axis, ± ± g/± ꢀ g/± 8 g/± 16 g
Digital MEMS Accelerometer
Data Sheet
ADXL3ꢀ3
FEATURES
GENERAL DESCRIPTION
Multipurpose accelerometer with 10- to 13-bit resolution for
use in a wide variety of applications
Digital output accessible via SPI (3- and 4-wire) and I2C
Built-in motion detection features make tap, double-tap,
activity, inactivity, and free-fall detection trivial
User-adjustable thresholds
The ADXL343 is a versatile 3-axis, digital-output, low g MEMS
accelerometer. Selectable measurement range and bandwidth, and
configurable, built-in motion detection make it suitable for sensing
acceleration in a wide variety of applications. Robustness to
10,000 g of shock and a wide temperature range (−40°C to +85°C)
enable use of the accelerometer even in harsh environments.
Interrupts independently mappable to two interrupt pins
Low power operation down to 23 µA and embedded FIFO for
reducing overall system power
Wide supply voltage range: 2.0 V to 3.6 V
I/O voltage 1.7 V to VS
Wide operating temperature range (−40°C to +85°C)
10,000 g shock survival
Small, thin, Pb free, RoHS compliant 3 mm × 5 mm × 1 mm
LGA package
The ADXL343 measures acceleration with high resolution (13-bit)
measurement at up to 16 g. Digital output data is formatted as
16-bit twos complement and is accessible through either an SPI
(3- or 4-wire) or I2C digital interface. The ADXL343 can
measure the static acceleration of gravity in tilt-sensing appli-
cations, as well as dynamic acceleration resulting from motion
or shock. Its high resolution (3.9 mg/LSB) enables measurement
of inclination changes less than 1.0°.
Several special sensing functions are provided. Activity and
inactivity sensing detect the presence or lack of motion. Tap
sensing detects single and double taps in any direction. Free-fall
sensing detects if the device is falling. These functions can be
mapped individually to either of two interrupt output pins.
APPLICATIONS
Handsets
Gaming and pointing devices
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
DD I/O
S
ADXL343
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
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