Magneto 12 Click Board™

How Does The Magneto 12 Click Board™ Work?

The Magneto 12 Click Board™ as its foundation uses the A31315, a magnetic position sensor from Allegro Microsystems. This sensor integrates vertical and planar Hall-effect elements with precision temperature-compensating circuitry to detect two out of three magnetic field components (X and Y). Using configurable signal processing, linearization, and angle calculation allows the A31315 to accurately resolve the absolute rotary (full 360° and short-stroke <360°) or linear position of a moving magnetic target.

The A31315 features a ratiometric analog interface to output the angle between the two factory-selected axes (X and Y). When using the analog mode of the A31315, the capacitance is provided for the stability of the output. A load resistor R4 also provides a known diagnostic state in a line break or device tri-state event. A series resistor R5 can be placed (default resistor value is 0Ω) before the capacitance C2 to create a low-pass filter for additional filtering and lower noise. However, caution should be taken, as this could also reduce the operating output voltage based on the ratio of the filter resistor and the load resistance.

The Magneto 12 Click Board™ possesses two ways to communicate with the MCU. The analog output signal of the A31315 can be converted to a digital value using MCP3221, a successive approximation A/D converter with a 12-bit resolution from Microchip using a 2-wire I2C compatible interface, or can be sent directly to an analog pin of the mikroBUS™ socket labelled as AN. The MCP3221 provides one single-ended input with low power consumption, a low maximum conversion current, and a Standby current of 250μA and 1μA, respectively. Data can be transferred at rates of up to 100kbit/s in the Standard and 400kbit/s in the Fast Mode. Selection can be performed by onboard SMD jumper labelled as ADC SEL, setting it to an appropriate position marked as AN and ADC.

The Magneto 12 Click Board™ can be operated only with a 5V 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

PINOUT DIAGRAM

This table shows how the pinout of the Magneto 12 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Analog Signal	AN	1	AN	PWM	16	NC
NC	2	RST	INT	15	NC
NC	3	CS	RX	14	NC
NC	4	SCK	TX	13	NC
NC	5	MISO	SCL	12	SCL	I2C Clock
NC	6	MOSI	SDA	11	SDA	I2C Data
NC	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS

MAGNETO 12 CLICK ELECTRICAL SPECIFICATIONS