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ADXL345BCCZ1 Datasheet(Arkusz danych) 1 Page - Analog Devices

Numer części ADXL345BCCZ1
Szczegółowy opis  Three-Axis, ±2/4/8/16g Digital Accelerometer
Pobierz  24 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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Three-Axis, ±2/4/8/16g
Digital Accelerometer
Preliminary Technical Data
ADXL345
Rev. PrA
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
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
www.analog.com
Fax: 781.461.3113
©2008 Analog Devices, Inc. All rights reserved.
FEATURES
Ultra low power: 25 to 130 µA at VS = 2.5 V (typ)
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
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
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
APPLICATIONS
Handsets
Gaming and pointing devices
Personal navigation devices
HDD protection
Fitness equipment
Digital cameras
GENERAL DESCRIPTION
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.
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°.
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.
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.
FUNCTIONAL BLOCK DIAGRAM
Figure 1. ADXL345 Simplified Block Diagram
3 AXIS
SENSOR
DIGITAL
FILTER
SENSE
ELECTRONICS
CONTROL
AND
INTERRUPT
LOGIC
SERIAL I/O
POWER
MANAGEMENT
COM
CS
SCL/SCLK
SDO/ALT
ADDRESS
SDA/SDI/SDIO
INT2
V
DD I/O
Vs
INT1
ADXL345
3 AXIS
SENSOR
DIGITAL
FILTER
DIGITAL
FILTER
SENSE
ELECTRONICS
CONTROL
AND
INTERRUPT
LOGIC
CONTROL
AND
INTERRUPT
LOGIC
SERIAL I/O
SERIAL I/O
POWER
MANAGEMENT
POWER
MANAGEMENT
COM
CS
SCL/SCLK
SDO/ALT
ADDRESS
SDA/SDI/SDIO
INT2
V
DD I/O
Vs
INT1
ADXL345




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