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ADXL345 Dataheets PDF



Part Number ADXL345
Manufacturers Analog Devices
Logo Analog Devices
Description Digital Accelerometer
Datasheet ADXL345 DatasheetADXL345 Datasheet (PDF)

Data Sheet ADXL345 3-Axis, ±2 g/±4 g/±8 g/±16 g Digital Accelerometer 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 FIFO technology mi.

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Data Sheet ADXL345 3-Axis, ±2 g/±4 g/±8 g/±16 g Digital Accelerometer 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 FIFO technology 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 FUNCTIONAL BLOCK DIAGRAM ► Gaming and pointing devices ► Industrial instrumentation ► Personal navigation devices ► Hard disk drive (HDD) protection GENERAL DESCRIPTION The ADXL345 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 accessible through either a SPI (3- or 4-wire) or I2C digital interface. The ADXL345 is well suited for mobile device applications. It measures 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 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. 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. Low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation. The ADXL345 is supplied in a small, thin, 3 mm × 5 mm × 1 mm, 14-lead, plastic package. Figure 1. Rev. G DOCUMENT FEEDBACK TECHNICAL SUPPORT Information furnished by Analog Devices is believed to be accurate and reliable "as is". 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. Data Sheet TABLE OF CONTENTS Features................................................................ 1 Applications........................................................... 1 General Description...............................................1 Functional Block Diagram......................................1 Specifications........................................................ 3 Absolute Maximum Ratings...................................5 Thermal Resistance........................................... 5 Recommended Soldering Profile........................5 ESD Caution.......................................................5 Pin Configuration and Function Descriptions........ 6 Typical Performance Characteristics..................... 7 Theory of Operation.............................................12 Power Sequencing........................................... 12 Power Savings................................................. 13 Serial Communications........................................14 SPI....................................................................14 I2C.................................................................... 17 Interrupts............................................................. 19 DATA_READY.................................................. 20 SINGLE_TAP................................................... 20 DOUBLE_TAP.................................................. 20 Activity.............................................................. 20 Inactivity........................................................... 20 FREE_FALL..................................................... 20 Watermark........................................................ 20 Overrun.........................................


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