The **MAH14FCG-R** is a high-performance **Magnetic Angle Sensor IC** developed by **MagnaChip**. It is designed to detect the absolute angular position of a permanent magnet rotating over the sensor, typically used in motor control and human-machine interface (HMI) applications. --- ## 1. Technical Specifications The following table highlights the core electrical and physical parameters of the MAH14FCG-R: | Parameter | Specification | | :--- | :--- | | **Technology** | Hall-effect based Magnetic Sensor | | **Resolution** | 14-bit (16,384 positions per revolution) | | **Interface** | SPI (Serial Peripheral Interface) & PWM | | **Supply Voltage (Vcc)** | 3.0V to 3.6V or 4.5V to 5.5V | | **Output Type** | Absolute Angular Position | | **Package** | QFN-16 (Quad Flat No-lead) | | **Operating Temperature** | -40°C to +125°C | --- ## 2. Key Functional Blocks To understand its electronics, it is helpful to look at its internal architecture: 1. **Hall Element Array:** A circular array of Hall plates that detect the orthogonal magnetic field components ($B_x$ and $B_y$) from a rotating magnet. 2. **Analog Front-End (AFE):** Includes low-noise amplifiers and filters to condition the weak signals from the Hall elements. 3. **DSP / CORDIC Engine:** The core "brain" of the chip. It uses the CORDIC (Coordinate Rotation Digital Computer) algorithm to calculate the arctangent of the magnetic field vectors, resulting in a precise angle. 4. **OTP Memory:** One-Time Programmable memory used for factory calibration and user-defined zero-point programming. --- ## 3. Communication Protocols The MAH14FCG-R offers multiple ways to retrieve data: ### SPI Interface The primary digital output. It allows for high-speed data transfer (up to 10MHz) and is used to read the 14-bit angle value, status bits (like magnetic field strength warnings), and parity bits for error checking. ### PWM Output A pulse-width modulated signal where the duty cycle corresponds directly to the absolute angle. This is useful for systems that do not have a dedicated SPI bus. --- ## 4. Typical Application Circuit When integrating this part into a PCB, a basic configuration involves: * **Decoupling Capacitors:** Placing 100nF and 1µF capacitors close to the Vcc/GND pins to filter noise. * **Magnet Placement:** A diametrically magnetized cylindrical magnet must be placed 0.5mm to 3.0mm above the center of the IC. * **Pull-up Resistors:** Required on the SPI lines (MISO, MOSI, SCK, CS) depending on the microcontroller interface. --- ## 5. Main Use Cases * **Robotics:** Joint position sensing and feedback. * **Industrial Automation:** Contactless potentiometers and valve control. * **Automotive:** Electronic throttle control and steering angle sensing. * **Drones:** Gimbal motor positioning.