FEATURES
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 I2
C
Built-in motion detection features make tap, double-tap,
activity, inactivity, and free-fall detection trivial
User-adjustable thresholds
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.
APPLICATIONS
Handsets
Gaming and pointing devices
Hard disk drive (HDD) protection
GENERAL DESCRIPTION
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.
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 I2
C digital interface. The ADXL343 can
measure the static acceleration of gravity in tilt-sensing applications,
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.
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
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