ADXL346ACCZ-R2 datasheet(1/40 Pages) AD

部品番号	ADXL346ACCZ-R2

部品情報	3-Axis, ±2 g/±4 g/±8 g/±16 g Ultralow Power Digital Accelerometer

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3-Axis, ±2 g/±4 g/±8 g/±16 g

Ultralow Power Digital Accelerometer

Data Sheet

ADXL346

Rev. C

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FEATURES

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

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)

Embedded memory management system with FIFO

technology minimizes host processor load

Single tap/double tap detection

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

APPLICATIONS

Handsets

Medical instrumentation

Gaming and pointing devices

Industrial instrumentation

Personal navigation devices

Hard disk drive (HDD) protection

GENERAL DESCRIPTION

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.

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°.

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 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.

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 ×

0.95 mm, 16-lead, plastic package.

FUNCTIONAL BLOCK DIAGRAM

3-AXIS

SENSOR

SENSE

ELECTRONICS

DIGITAL

FILTER

ADXL346

POWER

MANAGEMENT

CONTROL

AND

INTERRUPT

LOGIC

SERIAL I/O

INT1

VS

VDD I/O

INT2

SDA/SDI/SDIO

SDO/ALT

ADDRESS

SCL/SCLK

GND

ADC

32-LEVEL

FIFO

CS

Figure 1.

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