Image ADXL345
型号: ADXL345
厂商: Analog Devices Inc Analog Devices Inc
标准:
分类: 传感器,变送器
描述: three-axis, ??2/4/8/16g digital accelerometer
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Three-Axis, ±2/4/8/16g  
Digital Accelerometer  
ADXL345  
Preliminary Technical Data  
FEATURES  
GENERAL DESCRIPTION  
Ultra low power: 25 to 130 µA at VS = 2.5 V (typ)  
The ADXL345 is a small, thin, low power, three-axis  
accelerometer with high resolution (13-bit) measurement 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.  
Power consumption scales automatically with bandwidth  
User selectable fixed 10-bit resolution or 4mg/LSB scale  
factor in all g-ranges, up to 13-bit resolution at ±16 g  
32 level output data FIFO minimizes host processor load  
Built in motion detection functions  
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 (4mg/LSB) enables  
resolution of inclination changes of as little as 0.25°.  
Tap/Double Tap detection  
Activity/Inactivity monitoring  
Free-Fall detection  
Supply and I/O voltage range: 1.8 V to 3.6 V  
SPI (3 and 4 wire) and I2C digital interfaces  
Flexible interrupt modes – Any interrupt mappable to either  
interrupt pin  
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 interrupt  
output pins. An integrated 32 level FIFO can be used to store  
data to minimize host processor intervention.  
Measurement ranges selectable via serial command  
Bandwidth selectable via serial command  
Wide temperature range (-40 to +85°C)  
10,000 g shock survival  
Pb free/RoHS compliant  
Small and thin: 3 × 5 × 1 mm LGA package  
Low power modes enable intelligent motion-based power  
management with threshold sensing and active acceleration  
measurement at extremely low power dissipation.  
APPLICATIONS  
Handsets  
Gaming and pointing devices  
Personal navigation devices  
HDD protection  
The ADXL345 is supplied in a small, thin 3 mm × 5 mm ×  
1 mm, 14-lead, plastic package.  
Fitness equipment  
Digital cameras  
FUNCTIONAL BLOCK DIAGRAM  
Vs  
VDD I/O  
POWER  
MANAGEMENT  
INT1  
INT2  
CONTROL  
AND  
INTERRUPT  
LOGIC  
SENSE  
DIGITAL  
FILTER  
ELECTRONICS  
3 AXIS  
SENSOR  
SDA/SDI/SDIO  
SERIAL I/O  
ADXL345  
SDO/ALT  
ADDRESS  
SCL/SCLK  
COM  
CS  
Figure 1. ADXL345 Simplified Block Diagram  
Rev. PrA  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother  
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2008 Analog Devices, Inc. All rights reserved.  

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