Datasheet

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodACL™ Reference Manual

Revised April 15, 2016

This manual applies to the PmodACL rev. E

DOC#: 502-097

Other product and company names mentioned may be trademarks of their respective owners.

Page 1 of 3

Overview

The Digilent PmodACL is a 3-axis digital accelerometer module powered by the Analog Devices® ADXL345.

1 Functional Description

The PmodACL utilizes Analog Devices ADXL345 to provide high resolution acceleration changes including

inclination changes of less than 1.0°. With free fall and single/double-tap detection capabilities, the PmodACL can

be configured to take measurements on the user's whim.

2 Interfacing with the Pmod

The PmodACL communicates with the host board via the SPI protocol or the I²C protocol. SPI communication is

enabled when the Chip Select line is driven low; conversely, the I²C protocol is enabled when the Chip Select line is

driven to a logic level high voltage. An interrupt can be triggered whenever a measured axis acceleration data is

over a user-defined threshold limit. A data stream setting the threshold activity to a value of 250 mg and Interrupt

1 to be triggered whenever the X and Y axis exceeds the threshold level through SPI is provided below in Table 1.

The PmodACL.

 3-axis, ±2/4/8/16g accelerometer

 User-selectable resolution

 Activity/inactivity monitoring

 Single/double-tap and free-fall detection

 Small PCB size for flexible designs 1.0 in ×

0.8 in (2.5 cm × 2.0 cm)

 12-pin Pmod port with SPI interface and

2×4-pin I²C interface

 Follows Digilent Pmod Interface

Specification Type 2A

 Library and example code available

in resource center

Features include:

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300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodACL™ Reference Manual Revised April 15, 2016 This manual applies to the PmodACL rev. E Overview The Digilent PmodACL is a 3-axis digital accelerometer module powered by the Analog Devices® ADXL345. Features include:         3-axis, ±2/4/8/16g accelerometer User-selectable resolution Activity/inactivity monitoring Single/double-tap and free-fall detection Small PCB size for flexible designs 1.0 in × 0.8 in (2.5 cm × 2.
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PmodACL™ Reference Manual Read/~Write 0 Multi-byte 6-bit Threshold Activity Address 0 1 0 0 1 0 8 bits of Threshold Activity data (62.
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PmodACL™ Reference Manual 3 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 1 inch long on the sides parallel to the pins on the pin header and 0.8 inches long on the sides perpendicular to the pin header. Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.