PmodACL2™ Digital Accelerometer Reference Manual Revision: November 9, 2012 Note: This document applies to REV A of the board 1300 Henley Court | Pullman, WA 99163 (509) 334 6306 Voice and Fax Overview The PmodACL2 is a 3-axis digital accelerometer module powered by the Analog Devices ADXL362. Features include: • • • • • user-selectable resolution single or double-tap detection activity and inactivity monitoring free fall detection SPI Communication Functional Description The PmodACL2 uses a standard 12-pin connector and can communicate via SPI. While the ADXL362 is in Measurement Mode, it continuously measures and stores acceleration data in the X-data, Y-data, and Zdata registers. Do not exceed 3.3V on the VCC power supply. Exceeding this limit could permanently damage the ADXL362. Interface All communications with the device must specify a register address and a flag that indicate whether the communication is a read or a write. Actual data transfer always follows the register address and communication flag. Perform device configuration by writing to the control registers within the accelerometer. Access accelerometer data by reading the device registers. You may find a full list of registers, their functionality, and communication specifications in the ADXL362 datasheet available at: www.analog.com. Doc: 502-255 Connector J1 – SPI Communications Pin Signal Description 1 ~SS Slave select 2 MOSI SPI master out slave in data 3 MISO SPI master in slave out data 4 SCLK Serial clock 5 GND Power supply ground 6 VCC Power supply (3.3V) 7 INT2 Interrupt two 8 INT1 Interrupt one 9 NC Not connected 10 NC Not connected 11 GND Power supply ground 12 VCC Power supply (3.3V) Table 1. Interface Connector Signal Description The SPI standard uses four signal lines. These are slave select (~SS), master out slave in (MOSI), master in slave out (MISO), and serial clock (SCLK). These four signal lines map to the following signals on the ADXL345: ~SS corresponds to the chip select signal (~CS), MOSI corresponds to serial data input (SDI), MISO corresponds to serial data output (SDO), and SCK corresponds to the serial clock (SCLK). (See Table 1 for signal descriptions.) page 1 of 1 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
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