GENERAL DESCRIPTION：

The ADXL345 is a small, thin, ultralow power, 3-axis accelerometerwith high resolution (13-bit) measurement at up to ±16 g. Digitaloutput data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4-wire) or I2C digital interface.The ADXL345 is well suited for mobile device applications. Itmeasures the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motionor shock. Its high resolution (3.9 mg/LSB) enables measurementof inclination changes less than 1.0°.Several special sensing functions are provided. Activity andinactivity sensing detect the presence or lack of motion bycomparing the acceleration on any axis with user-set thresholds.Tap sensing detects single and double taps in any direction. Freefall sensing detects if the device is falling. These functions canbe 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 hostprocessor activity and lower overall system power consumption.Low power modes enable intelligent motion-based powermanagement with threshold sensing and active accelerationmeasurement at extremely low power dissipation.The ADXL345 is supplied in a small, thin, 3 mm × 5 mm × 1 mm,14-lead, plastic package. 

FEATURES：

Ultralow power: as low as 23 µA in measurement mode and

0.1 µA in standby mode at VS = 2.5 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 FIFOtechnology minimizes host processor load

Single tap/double tap detection

Activity/inactivity monitoring

Free-fall detection

Supply voltage range: 2.0 V to 3.6 V

I/O voltage range: 1.7 V to VS

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 × 5 mm × 1 mm LGA package

APPLICATIONS：

Handsets

Medical instrumentation

Gaming and pointing devices

Industrial instrumentation

Personal navigation devices

Hard disk drive (HDD) protection