MR Angle Click Board™

Product Code: MIKROE-4634

How Does The MR Angle Click Board™ Work? the MR Angle Click Board™ as its foundation uses the KMZ60, a high precision sensor for magnetic angle measurement from NXP Semiconductors. The integrated MR sensor element, a sensitive magnetic field sensor, employs the MR effect of thin-film permalloy. The sensor contains two parallel supplied Wheatstone bridges, which enclose a sensitive angle of 45 degrees. A rotating magnetic field in the surface parallel to the chip (x-y plane) will deliver two independent sinusoidal output signals, one following a cosine and the second following a sine function. It also comes with a Power-Down mode to enable or disable the device and a possibility for the temperature coefficient of the sensor amplitude to be compensated. The MR Angle Click Board™ communicates with MCU through the SPI serial interface using the MCP3204, a 12-bit 4-channel A/D converter from Microchip. The output sine and cosine signals from the KMZ60 are wired as pseudo-differential input signals to the MCP3204.

The MCP3204 samples both channels of the sensor simultaneously using an SPI interface, allowing access to both channels on one data line. Besides, it possesses additional functionality routed on two GPIO pins, such as Power-Down mode and temperature compensation. The KMZ60 can be used as specified with temperature compensation of the MR sensor signal. Pin TCE is used to enable the temperature compensation, routed on the RST pin of the mikroBUS™ socket (connected to the ground if no temperature compensation is required). The output signal amplitude will decrease with increasing temperature related to the temperature compensation of the MR sensor. The Power-Down feature labelled as PDN and routed on the PWM pin of the mikroBUS™ socket switches the device into Power-Down mode and sets the sine and cosine outputs in a high impedance state to avoid current consumption. The MR Angle Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to properly use the SPI communication lines. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development. SPECIFICATIONS Type Magnetic Applications Can be used for rotor position detection for BLDC motors and Electronic Power Steering (EPS) applications, steering angle measurement, window wiper position detection, and general contactless angular measurement (e.g., throttle valves or actuators). On-board modules KMZ60 - high precision sensor for magnetic angle measurement from NXP Semiconductors Key Features High precision sensor for magnetic angle measurement, temperature compensated output signal amplitude, Power-Down mode to enable or disable the device, integrated instrumentation amplifier, fully automotive qualified, and more. Interface SPI Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout of the MR Angle 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 PDN Power-Down Mode Temperature Compensation TCE 2 RST INT 15 NC 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 5V Power Supply Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR - Power