Accel 14 Click Board™

Product Code: MIKROE-4185

How Does The Accel 14 Click Board™ Work? The Accel 14 Click Board™ uses the IIS3DWB IC, an ultra-wide bandwidth, low-noise, 3-axis digital vibration sensor from STMicroelectronics. The wide bandwidth, low noise, very stable and repeatable sensitivity, together with the capability of operating over an extended temperature range, makes this device particularly suitable for vibration monitoring in industrial applications. The IIS3DWB has a selectable full-scale acceleration range of ±2/±4/±8/±16 g and is capable of measuring accelerations with a bandwidth up to 6 kHz with an output data rate of 26.7 kHz. A 3 kB first-in, first-out (FIFO) buffer is integrated into the device to avoid any data loss and to limit the intervention of the host processor. The Accel 14 Click Board™ offers two possible operating configurations: Power-Down and Normal Mode. IIS3DWB has a voltage supply range from 2.1V to 3.6V. To avoid potential conflicts, during the power-on sequence, it is recommended to set the lines connected to the device IO pins to high-impedance state on the host side.

Furthermore, to guarantee the proper power-off of the device, it is recommended to maintain the duration of the VDD line to GND for at least 100 μs. After the power supply is applied, the IIS3DWB performs a 10 ms boot procedure to load the trimming parameters. After the boot is completed, the accelerometer is automatically configured in Power-Down mode. When the sensor is in Power-Down mode, almost all internal blocks of the device are switched off. The SPI digital interface remains active to allow communication with the device. The content of the configuration registers is preserved and the output data registers are not updated, keeping the last data sampled in memory before going into Power-Down mode. When Accel 14 Click is set in Normal Mode, all three axes (X, Y, Z) are simultaneously active and acceleration data can be read from the sensor concurrently for the 3-axis and the sensor provides acceleration data at an output data rate of 26.667kHz. The IIS3DWB has been specifically designed to provide a wide bandwidth with very flat frequency response in the passband and very high attenuation in the stopband so to virtually eliminate any frequency aliasing. The functionality of the device and the measured acceleration data is accessible through the SPI interface. And also functions such as the threshold and the timing of the two interrupt pins can be completely programmed by the user through the SPI digital interface. The Accel 14 Click Board™ is designed to be operated only with 3.3V logic levels. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with logic levels of 5V. More information about the IIS3DWB can be found in the attached datasheet. However, the Click board™ comes equipped with a library that contains easy to use functions and a usage example that may be used as a reference for the development. SPECIFICATIONS Type Motion Applications It has many features that make it attractive for various applications such as vibration and condition monitoring, test and measurements, predictive maintenance, and more. On-board modules IIS3DWB Key Features Ultra-wide bandwidth, ultra-low noise density, high stability, low power consumption, thermal readings. Interface GPIO,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 on Accel 14 Click 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 Interrupt 2 I2 2 RST INT 15 I1 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 NC SPI Data IN SDI 6 MOSI SDA 11 NC Power Supply 3.3V