ADXL345-EP Datasheet by Analog Devices Inc.

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3-Axis, ±2 g/±4 g/±8 g/±16 g
Digital Accelerometer
Enhanced Product
ADXL345-EP
Rev. B Document Feedback
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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
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Tel: 781.329.4700 ©20092013 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
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 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
GENERAL DESCRIPTION
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
3-AXIS
SENSOR
SENSE
ELECTRONICS DIGITAL
FILTER
ADXL345-EP
POWER
MANAGEMENT
CONTROL
AND
INTERRUPT
LOGIC
SERIAL I/O
INT1
VSVDD I/O
INT2
SDA/SDI/SDIO
SDO/ALT
ADDRESS
SCL/SCLK
GND
ADC
32 LEVEL
FIFO
CS
10413-001
Figure 1.
ADXL345-EP Enhanced Product
Rev. B | Page 2 of 12
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
4/13Rev. 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
12/11Revision 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.
SELFVTEST“ POWER SUPPLY
Enhanced Product ADXL345-EP
Rev. B | Page 3 of 12
SPECIFICATIONS
TA = 25°C, VS = 2.5 V, V DD 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
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
%
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
34.5
mg/LSB
Sensitivity Change Due to Temperature
%/°C
0 g OFFSET Each axis
0 g Output for XOUT, YOUT 150 0 +150 mg
0 g Output for ZOUT 250 0 +250 mg
0 g Output Deviation from Ideal, X
OUT
, Y
OUT
mg
0 g Output Deviation from Ideal, Z
OUT
mg
0 g Offset vs. Temperature for X-, Y-Axes
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) 2.0 2.5 3.6 V
Interface Voltage Range (VDD I/O) 1.7 1.8 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
ADXL345-EP Enhanced Product
Rev. B | Page 4 of 12
Parameter Test Conditions Min Typ1 Max Unit
TEMPERATURE
Operating Temperature Range 55 +105 °C
WEIGHT
Device Weight 30 mg
1 The typical specifications shown are for at least 68% of the population of parts and are based on the worst case of mean ±1 σ, except for 0 g output and sensitivity,
which represents the target value. For 0 g output and sensitivity, the deviation from the ideal describes the worst case of mean ±1 σ.
2 Cross-axis sensitivity is defined as coupling between any two axes.
3 Bandwidth is the −3 dB frequency and is defined as half the output data rate, bandwidth = ODR/2.
4 The output format for the 3200 Hz and 1600 Hz ODRs is different from the output format for the remaining ODRs. This difference is described in the ADXL345 data
sheet.
5 Output data rates below 6.25 Hz exhibit additional offset shift with increased temperature, depending on selected output data rate. Refer to the ADXL345 data sheet
for details.
6 Self-test change is defined as the output (g) when the SELF_TEST bit = 1 (in the DATA_FORMAT register, Address 0x31) minus the output (g) when the SELF_TEST
bit = 0. Due to device filtering, the output reaches its final value after 4 × τ when enabling or disabling self-test, where τ = 1/(data rate). The part must be in normal
power operation (LOW_POWER bit = 0 in the BW_RATE register, Address 0x2C) for self-test to operate correctly.
7 Turn-on and wake-up times are determined by the user-defined bandwidth. At a 100 Hz data rate, the turn-on and wake-up times are each approximately 11.1 ms. For
other data rates, the turn-on and wake-up times are each approximately τ + 1.1 in milliseconds, where τ = 1/(data rate).
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Enhanced Product ADXL345-EP
Rev. B | Page 5 of 12
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Acceleration
Any Axis, Unpowered
10,000
g
Any Axis, Powered 10,000 g
VS 0.3 V to +3.9 V
VDD I/O 0.3 V to +3.9 V
Digital Pins 0.3 V to VDD I/O + 0.3 V or 3.9 V,
whichever is less
All Other Pins
0.3 V to +3.9 V
Output Short-Circuit Duration
(Any Pin to Ground)
Indefinite
Temperature Range
Powered 55°C to +105°C
Storage −65°C to +150°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
Table 3. Package Characteristics
Package Type θJA θJC Device Weight
14-Terminal LGA 150°C/W 85°C/W 30 mg
ESD CAUTION
ADXL345-EP Enhanced Product
Rev. B | Page 6 of 12
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
10413-002
CS
SDA/SDI/SDIO
SDO/ALT ADDRESS
RESERVED
NC
INT2
INT1
V
DD I/O
GND
RESERVED
GND
GND
V
S
13
12
11
10
9
8
1
2
3
4
+x
+y +z
5
6
14
7
SCL/SCLK
A
DXL345-EP
TOP VIEW
(Not to Scale)
Figure 2. Pin Configuration (Top View)
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1 VDD I/O Digital Interface Supply Voltage.
2 GND This pin must be connected to ground.
3 RESERVED Reserved. This pin must be connected to VS or left open.
4 GND This pin must be connected to ground.
5 GND This pin must be connected to ground.
6 VS Supply Voltage.
7 CS Chip Select.
8 INT1 Interrupt 1 Output.
9 INT2 Interrupt 2 Output.
10 NC Not Internally Connected.
11 RESERVED Reserved. This pin must be connected to ground or left open.
12 SDO/ALT ADDRESS Serial Data Output (SPI 4-Wire)/Alternate I2C Address Select (I2C).
13 SDA/SDI/SDIO Serial Data (I2C)/Serial Data Input (SPI 4-Wire)/Serial Data Input and Output (SPI 3-Wire).
14 SCL/SCLK Serial Communications Clock. SCL is the clock for I2C, and SCLK is the clock for SPI.
Enhanced Product ADXL345-EP
Rev. B | Page 7 of 12
TYPICAL PERFORMANCE CHARACTERISTICS
150
100
50
0
–50
–100
–150
–60 –40 –20 020 40 60 80 100
TEMPERATURE (°C)
OUTPUT (mg)
10413-004
Figure 3. X-Axis Zero g Offset vs. Temperature
Eight Parts in Sockets, VS = 3.6 V
150
100
50
0
–50
–100
–150
–60 –40 –20 020 40 60 80 100
TEMPERATURE (°C)
OUTPUT (mg)
10413-005
Figure 4. Y-Axis Zero g Offset vs. Temperature
Eight Parts in Sockets, VS = VDD I/O = 3.6 V
250
200
150
100
50
0
–50
–60 –40 –20 020 40 60 80 100
TEMPERATURE (°C)
OUTPUT (mg)
10413-011
Figure 5. Z-Axis Zero g Offset vs. Temperature
Eight Parts in Sockets, VS = VDD I/O = 3.6 V
150
100
50
0
–50
–100
–150
–60 –40 –20 020 40 60 80 100
TEMPERATURE (°C)
OUTPUT (mg)
10413-007
Figure 6. X-Axis Zero g Offset vs. Temperature
Eight Parts in Sockets, VS = 2.5 V
150
100
50
0
–50
–100
–150
–60 –40 –20 020 40 60 80 100
TEMPERATURE (°C)
OUTPUT (mg)
10413-008
Figure 7. Y-Axis Zero g Offset vs. Temperature
Eight Parts Soldered to PCB, VS = VDD I/O = 2.5 V
100
0
150
250
200
50
–50
–60 –40 –20 020 40 60 80 100
TEMPERATURE (°C)
OUTPUT (mg)
10413-012
Figure 8. Z-Axis Zero g Offset vs. Temperature
Eight Parts Soldered to PCB, VS = VDD I/O = 2.5 V
ADXL345-EP Enhanced Product
Rev. B | Page 8 of 12
256
258
260
254
252
248
246
244
242
250
–60 –40 –20 020 40 60 80 100 120
TEMPERATURE (°C)
SENSITIVITY (LSB/g)
10413-006
Figure 9. X-Axis Sensitivity vs. Temperature
Eight Parts in Sockets, VS = VDD I/O = 2.5 V
258
260
256
254
252
250
248
246
244
242
–60 –40 –20 020 40 60 80 100 120
TEMPERATURE (°C)
SENSITIVITY (LSB/g)
10413-010
Figure 10. Z-Axis Sensitivity vs. Temperature
Eight Parts in Sockets, VS = VDD I/O = 2.5 V
258
260
256
254
252
248
246
244
242
250
–60 –40 –20 020 40 60 80 100 120
TEMPERATURE (°C)
SENSITIVITY (LSB/g)
10413-009
Figure 11. Y-Axis Sensitivity vs. Temperature
Eight Parts in Sockets, VS = VDD I/O = 2.5 V
w E W EDDDDD EDBBD I: ORDERING GUIDE O L
Enhanced Product ADXL345-EP
Rev. B | Page 9 of 12
OUTLINE DIMENSIONS
BOTTOM VIEW
TOP VIEW
END VI
EW
SEATING
PLANE
1.00
0.95
0.85
5.00
BSC
3.00
BSC
PAD A1
CORNER
0.79
0.74
0.69
1
6
7
8
14
13
0.80
BSC
1.01
1.50
0.49
0.50
0.49 0.813 × 0.50
03-16-2010-A
Figure 12. 14-Terminal Land Grid Array [LGA]
(CC-14-1)
Solder Terminations Finish Is Au over Ni
Dimensions shown in millimeters
ORDERING GUIDE
Model1
Measurement
Range (g)
Specified
Voltage (V)
Temperature
Range Package Description
Package
Option
ADXL345TCCZ-EP ±2, ±4, ±8, ±16 2.5 55°C to +105°C 14-Terminal Land Grid Array [LGA] CC-14-1
ADXL345TCCZ-EP-RL7 ±2, ±4, ±8, ±16 2.5 55°C to +105°C 14-Terminal Land Grid Array [LGA] CC-14-1
ADXL345TCCZ-EP-RL ±2, ±4, ±8, ±16 2.5 55°C to +105°C 14-Terminal Land Grid Array [LGA] CC-14-1
1 Z = RoHS Compliant Part.
ADXL345-EP Enhanced Product
Rev. B | Page 10 of 12
NOTES
Enhanced Product ADXL345-EP
Rev. B | Page 11 of 12
NOTES
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ADXL345-EP Enhanced Product
Rev. B | Page 12 of 12
NOTES
Analog Devices offers specific products designated for automotive applications; please consult your local Analog Devices sales representative for details. Standard products sold by
Analog Devices are not designed, intended, or approved for use in life support, implantable medical
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resulting from such unintended use.
©20092013 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D10413-0-4/13(B)