Accel 21 Click Board™

Product Code: MIKROE-5530

How Does The Accel 21 Click Board™ Work? The Accel 21 Click Board™ is based on the MIS2DH, a highly reliable digital triaxial acceleration and temperature sensor from STMicroelectronics. The MIS2DH is highly configurable with a programmable acceleration range of ±2g, ±4g, ±8g, or ±16g, capable of measuring accelerations with output data rates from 1Hz to 5.3kHz. Multiple operating modes (high-resolution, normal, and low-power mode) with various bandwidths and output data resolutions contribute significantly to applications such as activity monitoring and posture detection. The complete measurement chain is composed of a low-noise capacitive amplifier which converts the capacitive unbalance of the MEMS sensor into an analogue voltage that will be available to the user through an analogue-to-digital converter. The acceleration data is accessed through I2C or SPI interface with a maximum frequency of 400kHz 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 MIS2DH allows choosing the least significant bit (LSB) of its I2C slave address using the SMD jumper labelled ADDR SEL. The MIS2DH also possesses two interrupts, IN1 and IN2, routed to the PWM and INT pins on the mikroBUS™ socket, entirely programmed by the user through a serial interface. They signal MCU that an event, such as inertial wake-up/free-fall or the board's position, has been sensed. The Accel 21 Click Board™ can only operate 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 multiple applications such as motion-activated functions, posture and free-fall detection, and more On-board modules MIS2DH - digital triaxial acceleration sensor from STMicroelectronics Key Features High performance, MEMS sensor with on-chip signal processing, low power consumption, programmable interrupts, selectable interface, 6D/4D orientation detection, motion and free-fall detection, 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 21 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 IN1 Interrupt 1 NC 2 RST INT 15 IN2 Interrupt 2 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 ADDR SEL Left I2C Address Selection 0/1: Left position 0, Right position 1 JP2-JP4 COMM SEL Right Communication Interface Selection SPI/I2C: Left position SPI, Right position I2C ACCEL 21 CLICK ELECTRICAL SPECIFICATIONS Description Min Typ Max Unit