Magneto 13 Click Board™

Product Code: MIKROE-5643

How Does The Magneto 13 Click Board™ Work? The Magneto 13 Click Board™ is based on the MA736, a contactless digital angle sensor from Monolithic Power Systems. Its angle encoder has a configurable 8-bit to 12.5-bit absolute resolution and low latency at a constant rotation speed, allowing rotation measurements from 0 to 60.000 RPM. If used in servo motor applications, it is worth knowing that digital filtering is adjustable to optimize the control loop performance. For the best performance, the best mounting method would be to place the sensor on the rotation axis of a permanent magnet, such as a diametrically magnetized cylinder. The Magneto 13 Click Board™ detects the strength of the magnetic field, and for diagnostic purposes, it uses configurable thresholds. The configuration parameters, such as the reference zero-angle and magnetic field detection threshold, are stored in on-chip non-volatile memory (NVM). The values from the NVM are loaded automatically during the Start-up condition and can be restored through the SPI interface.

The sensor detects the magnetic field with the integrated Hall devices, with the angle measured with the SpinAxis method, which digitizes the direction of the field. Doing so, it does not need feedback loop-based circuits or complex arctangent computations. This method generates a sinusoidal signal with a phase representing the magnetic field's angle. The angle is obtained by a time-to-digital converter that measures the time between the zero crossing of the sinusoidal signal and the edge of a constant waveform. To communicate with the host MCU, this Click board™ uses the standard 4-Wire SPI serial interface, supporting SPI mode 0 and mode 3. Modes are detected automatically by the sensor. In addition, error flags with active HIGH are available on ERR pin. The angle changes exceeding the defined threshold are indicated as output interruptions over the IRQ pin. The NVM pin is the output that MA736 uses to indicate whether it is busy accessing the non-volatile memory. Also, two LEDs, MGH and MGL, are visually present if the field strength is above or below the selected threshold. The Magneto 13 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 Type Magnetic Applications It can be used for general-purpose angle measurement, high-resolution angle encoders, automotive positioning sensing, robotics, and more. On-board modules MA736 - contactless digital angle sensor from Monolithic Power Systems Key Features Low power consumption, highest reliability and durability, high-resolution output, operates with wide magnetic range, programmable threshold, non-volatile memory, and more Interface 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 Magneto 13 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes Error Flag ERR 1 AN PWM 16 NVM Non-Volatile Memory Indicator NC 2 RST INT 15 IRQ Angle Interrupt 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 Label Name Default Description LD1 PWR