Preliminary Technical Data
Three-Axis, ±2 g/±4 g/±8 g/±16g
Ultralow power: 25 µA to 145 µA at VS = 1.8 V (typ)
Power consumption scales automatically with bandwidth
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
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
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
Gaming and pointing devices
Personal navigation devices
Hard disk drive (HDD) protection
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
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