Accelerometer - ADXL345 Rev. 0

Accelerometer - ADXL345 Rev. 0 - 3-Axis, 2 g/4 g/8 g/16 g...

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3-Axis, ±2 g /±4 g /±8 g /±16 g Digital Accelerometer ADXL345 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. See the last page for disclaimers. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved. FEATURES Ultralow power: as low as 40 μA in measurement mode and 0.1 μA in standby mode at V S = 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 m g /LSB scale factor in all g ranges ) Embedded, patent pending FIFO technology minimizes host processor load 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 V S SPI (3- and 4-wire) and I 2 C 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 Fitness equipment GENERAL DESCRIPTION The ADXL345 is a small, thin, low 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 a SPI (3- or 4-wire) or I 2 C digital interface. The ADXL345 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 m g /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 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, patent pending 32-level first in, first out (FIFO) buffer can be used to store data to minimize host processor intervention.
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Accelerometer - ADXL345 Rev. 0 - 3-Axis, 2 g/4 g/8 g/16 g...

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