Accel 27 Click Board™

Product Code: MIKROE-5528

How Does The Accel 27 Click Board™ Work? The Accel 27 Click Board™ is based on the ADXL373, a complete three-axis ±400g acceleration measurement system from Analog Devices, operating at extremely low power levels. Built-in digital logic enables autonomous operation and implements functions that enhance system-level power savings. It offers 12-bit output data at 200mg/LSB scale factor, where acceleration is reported digitally through a configurable and selectable serial interface. The ADXL373 has three operating modes. Measurement mode is used for continuous, broad bandwidth sensing. The wake-up mode is used for limited bandwidth low g activity detection, and the instant-on mode is used for low power impact detection. Measurement can be suspended entirely by placing the ADXL373 in Standby mode. As mentioned, the acceleration data is accessed through I2C or SPI interface with a maximum frequency of 3.4MHz for I2C and 10MHz for SPI communication. The selection is made by positioning SMD jumpers labelled COMM SEL in an appropriate position.

Note that all the jumpers' positions must be on the same side, or the Click board™ may become unresponsive. While the I2C interface is selected, the ADXL373 allows choosing the least significant bit (LSB) of its I2C slave address using the SMD jumper labelled ADDR SEL. This board also possesses two interrupts, IT1 and IT2, routed to, where by default, the INT and AN pins stand on the mikroBUS™ socket, entirely programmed by the user through a serial interface. They signal MCU that a motion event has been sensed. The Accel 27 Click Board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development. SPECIFICATIONS Type Motion Applications It can be used for motion-activated functions, impact, and shock detection, medical IoT applications, and more On-board modules ADXL373 - three-axis MEMS accelerometer from Analog Devices Key Features ±400g measurement range, user-selectable bandwidth with 4-pole antialiasing filter, selectable oversampling ratio, low power consumption, built-in features for system power savings, selectable interface, event monitoring, and more Interface I2C,SPI Compatibility mikroBUS Input Voltage 3.3V PINOUT DIAGRAM This table shows how the pinout of the Accel 27 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes Interrupt 2 IT2 1 AN PWM 16 NC NC 2 RST INT 15 IT1 Interrupt 1 SPI Chip Select CS 3 CS RX 14 NC SPI Clock SCK 4 SCK TX 13 NC SPI Data OUT SDO 5 MISO SCL 12 SCL I2C Clock SPI Data IN SDI 6 MOSI SDA 11 SDA I2C Data Power Supply 3.3V 7 3.3V 5V 10 NC Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR - Power LED Indicator JP1-JP4 COMM SEL Right Communication Interface Selection SPI/I2C: Left position SPI, Right position I2C JP5 ADDR SEL Left I2C Address Selection 0/1: Left position 0, Right position 1 ACCEL 27 CLICK ELECTRICAL SPECIFICATIONS Description Min Typ Max Unit Supply Voltage - 3.3 - V