Digital Accelerometer. ADXL345-EP Datasheet

ADXL345-EP Accelerometer. Datasheet pdf. Equivalent

ADXL345-EP Datasheet
Recommendation ADXL345-EP Datasheet
Part ADXL345-EP
Description Digital Accelerometer
Feature ADXL345-EP; Enhanced Product 3-Axis, ±2 g/±4 g/±8 g/±16 g Digital Accelerometer ADXL345-EP FEATURES GENERAL D.
Manufacture Analog Devices
Datasheet
Download ADXL345-EP Datasheet




Analog Devices ADXL345-EP
Enhanced Product
3-Axis, ±2 g/±4 g/±8 g/±16 g
Digital Accelerometer
ADXL345-EP
FEATURES
GENERAL DESCRIPTION
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 from 10 to 13 bits
4 mg/LSB scale factor in all g ranges
32-sample FIFO minimizes host processor load
Single tap, double tap, and free-fall detection
Activity/inactivity monitoring
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
10,000 g shock survival
Pb free/RoHS compliant
Small and thin: 3 mm × 5 mm × 1 mm LGA package
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC standard)
Extended industrial temperature range (−55°C to +105°C)
Controlled manufacturing baseline
One assembly/test site
One fabrication site
Enhanced product change notification
Qualification data available on request
APPLICATIONS
Industrial equipment
Aerospace equipment
The ADXL345-EP is an extended performance version of
the ADXL345, which 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-EP is well suited for extended temperature range
industrial and aerospace equipment. 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-EP is supplied in a small, thin, 3 mm × 5 mm ×
1 mm, 14-lead, enhanced plastic package.
FUNCTIONAL BLOCK DIAGRAM
VS VDD I/O
ADXL345-EP
POWER
MANAGEMENT
3-AXIS
SENSOR
SENSE
ELECTRONICS
ADC
DIGITAL
FILTER
CONTROL
AND
INTERRUPT
LOGIC
INT1
INT2
32 LEVEL
FIFO
SERIAL I/O
SDA/SDI/SDIO
SDO/ALT
ADDRESS
SCL/SCLK
GND
CS
Figure 1.
Rev. B
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Analog Devices ADXL345-EP
ADXL345-EP
Enhanced Product
TABLE OF CONTENTS
Features .............................................................................................. 1
Enhanced Product Features ............................................................ 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Related Documents .......................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings ............................................................5
Thermal Resistance .......................................................................5
ESD Caution...................................................................................5
Pin Configuration and Function Descriptions..............................6
Typical Performance Characteristics ..............................................7
Outline Dimensions ..........................................................................9
Ordering Guide .............................................................................9
REVISION HISTORY
4/13—Rev. A to Rev. B
Deleted Package Information Section, Figure 2, and Table 4,
Renumbered Sequentially.................................................................5
2/13—Rev. 0 to Rev. A
Changes 354 to 345 in Figure 2....................................................... 5
12/11—Revision 0: Initial Version
RELATED DOCUMENTS
The ADXL345-EP is, by definition, an extended performance variation of the ADXL345 accelerometer. All ADXL345 datasheet
descriptions are applicable and not repeated in this document, so users should refer to it for complete functionality and product
description. Information and data in this ADXL345-EP subset datasheet supersede those in the standard ADXL345 datasheet.
Rev. B | Page 2 of 12



Analog Devices ADXL345-EP
Enhanced Product
ADXL345-EP
SPECIFICATIONS
TA = 25°C, VS = 2.5 V, VDD I/O = 1.8 V, acceleration = 0 g, CS = 10 µF tantalum, CI/O = 0.1 µF, output data rate (ODR) = 800 Hz, unless
otherwise noted. All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed.
Table 1.
Parameter
Test Conditions
Min Typ1
Max Unit
SENSOR INPUT
Each axis
Measurement Range
User selectable
±2, ±4, ±8, ±16
g
Nonlinearity
Percentage of full scale
±0.5 %
Inter-Axis Alignment Error
±0.1 Degrees
Cross-Axis Sensitivity2
±1 %
OUTPUT RESOLUTION
Each axis
All g Ranges
10-bit resolution
10 Bits
±2 g Range
Full resolution
10 Bits
±4 g Range
Full resolution
11 Bits
±8 g Range
Full resolution
12 Bits
±16 g Range
Full resolution
13 Bits
SENSITIVITY
Each axis
Sensitivity at XOUT, YOUT, ZOUT
All g-ranges, full resolution
230 256
282 LSB/g
±2 g, 10-bit resolution
230 256
282 LSB/g
±4 g, 10-bit resolution
115 128
141 LSB/g
±8 g, 10-bit resolution
57 64
71 LSB/g
±16 g, 10-bit resolution
29 32
35 LSB/g
Sensitivity Deviation from Ideal
All g-ranges
±1.0 %
Scale Factor at XOUT, YOUT, ZOUT
All g-ranges, full resolution
3.5 3.9
4.3 mg/LSB
±2 g, 10-bit resolution
3.5 3.9
4.3 mg/LSB
±4 g, 10-bit resolution
7.1 7.8
8.7 mg/LSB
±8 g, 10-bit resolution
14.1 15.6
17.5 mg/LSB
±16 g, 10-bit resolution
28.6 31.2
34.5 mg/LSB
Sensitivity Change Due to Temperature
±0.01
%/°C
0 g OFFSET
Each axis
0 g Output for XOUT, YOUT
−150 0
+150 mg
0 g Output for ZOUT
0 g Output Deviation from Ideal, XOUT, YOUT
0 g Output Deviation from Ideal, ZOUT
0 g Offset vs. Temperature for X-, Y-Axes
−250
0
±35
±40
±0.4
+250
mg
mg
mg
mg/°C
0 g Offset vs. Temperature for Z-Axis
±1.2 mg/°C
NOISE
X-, Y-Axes
ODR = 100 Hz for ±2 g, 10-bit resolution or
all g-ranges, full resolution
0.75
LSB rms
Z-Axis
ODR = 100 Hz for ±2 g, 10-bit resolution or
all g-ranges, full resolution
1.1
LSB rms
OUTPUT DATA RATE AND BANDWIDTH
User selectable
Output Data Rate (ODR)3, 4, 5
0.1 3200 Hz
SELF-TEST6
Output Change in X-Axis
0.20 2.10 g
Output Change in Y-Axis
−2.10
−0.20 g
Output Change in Z-Axis
0.30 3.40 g
POWER SUPPLY
Operating Voltage Range (VS)
Interface Voltage Range (VDD I/O)
2.0 2.5
1.7 1.8
3.6 V
VS V
Supply Current
ODR ≥ 100 Hz
140 µA
ODR < 10 Hz
23 µA
Standby Mode Leakage Current
0.1 µA
Turn-On and Wake-Up Time7
ODR = 3200 Hz
1.4 ms
Rev. B | Page 3 of 12







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