3-Axis, ±2 g/±4 g/±8 g/±16 g
Digital Accelerometer Evaluation Board
EVAL-ADXL345Z
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes.
Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or
statutory including, but not limited to, any implied warranty of merchantability or fitness for a
particular purpose. No license is granted by implication or otherwise under any patents or other
intellectual property by application or use of evaluation boards. Information furnished by Analog
Devices is believed to be accurate and reliable. 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. Analog Devices reserves the right to change devices or specifications at any time
without notice. Trademarks and registered trademarks are the property of their respective owners.
Evaluation boards are not authorized to be used in life support devices or systems.
One Technology 62-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved.
ADXL345
TOP VIEW
(Not to Scale)
Way, P.O. Box 9106, Norwood, MA 020
GENERAL DESCRIPTION
The EVAL-ADXL345Z is a simple evaluation board that allows
quick evaluation of the performance of the ADXL345 3-axis
digital accelerometer. The EVAL-ADXL345Z has two sets of
0.1 inch spaced vias, for population of a 4-pin and 5-pin header,
for access to all power and signal lines. The vias or headers
allow the evaluation board to be attached to a prototyping
board (breadboard) or attached to the PCB in an existing
system. Four holes are provided for mechanical attachment of
the EVAL-ADXL345Z to the application. An external host
processor is required for communication to the part.
The dimensions of the EVAL-ADXL345Z are 20 mm × 20 mm
with mounting holes set 15 mm × 15 mm at the corners of the
printed circuit board (PCB).
CIRCUIT DESCRIPTION
The schematic of the EVAL-ADXL345Z is shown in Figure 1.
See the ADXL345 data sheet for configuration of the
accelerometer after it is connected to the application host
processor.
The PCB layout of the EVAL-ADXL345Z is shown in Figure 2.
The EVAL-ADXL345Z has three factory installed capacitors for
bypass: two 100 nF capacitors and a 10 μF capacitor. C1 and C2
are V
S
bypass capacitors to reduce analog supply noise and C3,
located between V
DD I/O
and GND, is provided to reduce digital
clocking noise.
HANDLING CONSIDERATIONS
The EVAL-ADXL345Z is not reverse polarity protected. Reversing
the V
S
or V
DD I/O
supply and GND pins can cause damage to the
ADXL345.
Dropping the EVAL-ADXL345Z on a hard surface can generate
several thousand g’s of acceleration, which may exceed the data
sheet absolute maximum limits. See the ADXL345 data sheet
for more information.
8259-001
SDO/
ALT ADDRESS
V
DD I/O
GND
V
S
13
12
11
10
9
8
1
2
3
4
+x
+y
+z
5
6
14
7
CS
SDA/SDI/SDIO
INT2
INT1
SCL/SCLK
C3
0.1µF
C1
0.1µF
C2
10µF
Figure 1. Schematic
345C
C1
C2
C3
U1
EVAL-ADXL345Z
VIO
GND
CS
VS
J1
J2
345C
C1
C2
C3
U1
EVAL-ADXL345Z
VIO
GND
CS
VS
SCL
SDA
SDO
INT1
INT2
J1
J2
08259-002
Figure 2. Physical Layout
