9DOF 3 Click Board™

How Does The 9DOF 3 Click Board™ Work?

The 9DOF 3 Click Board™ features the BMX055, an integrated 9-axis sensor for the detection of movements and rotations and magnetic heading. It comprises the full functionality of a triaxial, low-g acceleration sensor, a triaxial angular rate sensor and a triaxial geomagnetic sensor. The BMX055 senses orientation, tilt motion, acceleration, rotation, shock, vibration and heading in cell phones, handhelds, computer peripherals, man-machine interfaces, virtual reality features and game controllers.

The BMX055 allows accurate measurements of angular rate, acceleration and geomagnetic fields in 3 perpendicular axes within one device. The programmable measurement ranges are ±2g, ±4g, ±8g, 16g for accelerometer, ±125°/s, ±250°/s, ±500°/s, ±1000°/s, ±2000°/s for gyroscope and 1300µT (x,y), 2500µT (z) for the magnetometer. The smallest to be distinguished magnitude from the measured value, or short for resolution, is 0.98mg, 0.004°/s and 0.3µT for accelerometer, gyroscope and magnetometer respectively.

There are several power modes configurable for each sensor intended for low-power applications and power saving. The data from sensors are acquired via a selected digital interface either SPI or I2C, by reading the addresses directly. Featured IC possesses a 16bit gyroscope, 12bit accelerometer and a full performance geomagnetic sensor that provides data in 2's complement representation. Measured data compensation and calibration are also included as an on-chip feature, as well as a temperature sensor for the reduction of temperature fluctuations on sensitive components.

The 9DOF 3 Click Board™ supports two serial digital interface protocols for communication as a slave with a host device: SPI and I2C. The active interface is selected by soldering the SMD jumpers to an appropriate position. The slave I2C address can also be configured by an SMD jumper when the Click board™ is operated in the I2C mode. The group of SMD jumpers labelled as ADDR SEL are used to set the I2C address of the BMX055.

The BMX055 module supports four interrupt pins for each sensor: Accel_INT, Gyro_INT, Mag_INT and DRDY. The sensor interrupt is selectable via one cross-shaped jumper selection and routed to the Mikrobus INT pin. There is also a header on top of the click with the breakout of all available sensors interrupt pins.

The 9DOF 3 Click Board™ is designed to be operated only with a 3.3V logic level. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with different logic levels.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout of the 9DOF 3 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	CS3	Chip Select Mag
Chip Select Gyro	CS2	2	RST	INT	15	INT	Interrupt
SPI Select Accel	CS1	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

MAXIMUM RATINGS (LIMITING CONDITIONS)