Accel 28 Click Board™

Product Code: MIKROE-5737

How Does The Accel 28 Click Board™ Work? The Accel 28 Click Board™ is based on the LIS2HH12TR, an ultra-low-power high-performance three-axis accelerometer from STMicroelectronics. The sensing element is made of a suspended silicone structure anchored in a few points and free to move toward the sensed acceleration. If there is an acceleration, the proof mass is displaced from its normal position and causes an imbalance in the capacitive half-bridge, which is measured. The whole measurements are on the values of internal capacitors. The values are outputted as 16-bit data. The sensor features extreme robustness with 10000g of high shock survivability. It also has an embedded temperature sensor for temperature compensation and a self-test. The self-test capability allows the user to check the functioning of the sensor in the final application. The sensor is already factory calibrated. The FIFO buffer of the LIS2HH12TR sensor works in several modes. Bypass mode bypasses the FIFO and is used to reset the FIFO when in FIFO mode.

In FIFO mode, the sensor stores data from all three channels in the FIFO buffer. Stream mode provides continuous FIFO updates; the older data is discarded as new data arrives. There are additional modes Stream-to-FIFO, Bypass-to-Stream, Bypass-to-FIFO, Retrieving data from FIFO, and Burst. The Burst mode allows multiple reads to be performed. The Accel 28 Click Board™ allows using both I2C and SPI interfaces with a maximum frequency of 400KHz for I2C and 10MHz for SPI communication. The selection can be made by positioning SMD jumpers labelled as 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 LIS2DTW12 allows choosing the least significant bit (LSB) of its I2C slave address using the SMD jumper labelled ADDR SEL. The Accel 28 Click Board™ also possesses two interrupt pins, both routed to the INT pin on the mikroBUS™ socket over the INT SEL jumper (default INT1). These interrupt pins signal MCU that an event has been sensed entirely programmed by the user through the I2C/SPI interface. This 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 various applications such as motion-activated functions and user interfaces, tap-double-tap recognition, free-fall detection, tracking, and many more On-board modules LIS2HH12TR - ultra-low-power high-performance three-axis accelerometer from STMicroelectronics Key Features Low power consumption, high performance and resolution, high reliability, FIFO storage, integrated interrupt features, selectable serial interface, embedded temperature sensor, embedded self-test, and more Interface I2C,SPI Compatibility mikroBUS Click board size S (28.6 x 25.4 mm) Input Voltage 3.3V PINOUT DIAGRAM This table shows how the pinout of the Accel 28 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 NC NC 2 RST INT 15 INT Interrupt 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 D