Magneto 14 Click

NOTE: Rotary Magnetic Holder does not come in the same package as this Click board™, but you can find it in our shop.

How does it work?

Magneto 14 Click is based on the MA735, a contactless angle sensor with ABZ and PWM output from Monolithic Power Systems. It can detect an absolute angular position of a permanent magnet, typically a diametrically magnetized cylinder on a rotating shaft. The adjustable digital filtering can optimize control loop performance when used in servo applications. In addition, the sensor features magnetic field strength detection with a programmable threshold and on-chip non-volatile memory. This memory can store configuration parameters, including magnetic field detection thresholds, ABZ encoder settings, and reference zero-angle positions. The frequency of the PWM output of the sensor is up to 1090Hz with a 14-bit resolution.

The MA735 uses integrated Hall devices to detect the magnetic field, while the angle is measured using MPS’s proprietary Spinaxis™ method. This method is based on phase detection and digitizes the direction of the field directly, generating a sinusoidal signal with a phase that represents the angle of the field. The angle is obtained from a signal by a time-to-digital converter, and the digital number proportional to the magnetic field is delivered at a rate of 1MHz.

Two headers on this Click board™ allow additional functionalities. The SSI header with SSD and SCK pins is a 2-Wire synchronous serial interface for data reading only and can be used for angle reading operation. The INC OUT header is an incremental output encoder with A, B, and Z pins. The ABZ encoder emulates a 12-bit incremental encoder (like an optical encoder), providing logic pulses per turn from 1 to 1024 in quadrature.

A unique addition to this board is a position for a Rotary Magnet Holder designed to be used alongside a magnetic contactless angle sensor allowing fast prototyping and quick measurements during development. Rotary Magnetic Holder does not come in the same package as this Click board™, but you can find it in our shop.

The Magneto 14 Click uses a standard 4-Wire SPI serial interface with a maximum supported clock rate of 25MHz. The PWM absolute output provides a logic signal with a duty cycle proportional to the angle of the magnetic field on the pin PWM of the mikroBUS™ socket. This sensor has two thresholds, MGL and MGH, for low and high magnetic fields. The magnetic field high threshold (MFHT) is indicated over the MGH interrupt pin, together with an additional MGH red LED.

This Click board™ can only be operated 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

Pinout diagram

This table shows how the pinout on Magneto 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	PWM	PWM Output
	NC	2	RST	INT	15	MGH	Magnetic Field High Threshold
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	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Magneto 14 Click electrical specifications

Software Support

We provide a library for the Magneto 14 Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Magneto 14 Click driver.

Key functions

• magneto14_get_angle Magneto 14 gets the angular position function.

• magneto14_get_field_strength Magneto 14 gets the magnetic field strength function.

• magneto14_get_mgh Magneto 14 gets the MGH function.

Example Description

This library contains API for the Magneto 14 Click driver. The demo application reads and displays the magnet’s angular position in degrees.

void application_task ( void ) 
 { 
     static uint8_t field_strength = 0; 
     static float angle = 0; 
     if ( MAGNETO14_OK == magneto14_get_field_strength( &magneto14, &field_strength ) ) 
     { 
         if ( ( MAGNETO14_FLD_ST_OK == field_strength ) &&  
              ( MAGNETO14_MGH_ST_OK == magneto14_get_mgh( &magneto14 ) ) &&  
              ( MAGNETO14_OK == magneto14_get_angle( &magneto14, &angle ) ) ) 
         { 
             log_printf( &logger, " Angle: %.2f [deg]rn", angle ); 
             log_printf( &logger, " -------------------- rn" ); 
             Delay_ms( 1000 ); 
         } 
     } 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Magneto14

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK – MIKROE Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.