The **MA63TAX-R** is a high-precision magnetic rotary encoder manufactured by **Monolithic Power Systems (MPS)**. It belongs to the MagAlpha series, designed to replace traditional optical encoders and potentiometers in industrial and consumer applications. --- ### ## Technical Specifications Below are the primary electronic characteristics of the MA63TAX-R: | Parameter | Specification | | :--- | :--- | | **Sensor Type** | Giant Magnetoresistance (GMR) | | **Resolution** | 12-bit (4096 positions per revolution) | | **Supply Voltage (Vdd)** | 3.3V (Typical) | | **Interface** | SPI (Serial Peripheral Interface) | | **Output Type** | Absolute Angle, PWM, or UVW (for Motor Commutation) | | **Operating Temperature** | -40°C to +125°C | | **Package** | QFN-16 (3mm x 3mm) | --- ### ## Key Features 1. **Side-Shaft Capability:** Unlike standard encoders that require the magnet to be placed directly above the chip (End-of-Shaft), the "TAX" variant is optimized for **Side-Shaft** (off-axis) mounting. This allows the sensor to be placed next to a ring magnet or a cylindrical magnet on a shaft. 2. **Latency and Speed:** It features very low latency (usually in the microsecond range), making it suitable for high-speed motor control loops. 3. **Programmable Settings:** Using the SPI interface, users can program parameters such as: * Zero-point position. * Magnetic field detection thresholds. * Filter settings to balance resolution vs. speed. 4. **UVW Signals:** It can emulate Hall Effect sensor outputs (U, V, W phases), which is essential for commutating Brushless DC (BLDC) motors. --- ### ## Pinout and Connectivity (Typical) The QFN-16 package typically utilizes the following pin groupings: * **Power:** `VDD` (Power supply) and `GND` (Ground). * **Communication (SPI):** `MOSI`, `MISO`, `SCLK`, and `CS` (Chip Select). * **Outputs:** `PWM` (Pulse Width Modulation) or `UVW` pins for motor feedback. * **Analog:** Decoupling capacitor pins for internal regulators. --- ### ## Typical Application Circuit ```cpp // Schematic Logic for SPI Interface [MCU] [MA63TAX-R] SCK --------------> SCK MISO <-------------- MISO MOSI --------------> MOSI CS --------------> CS 3.3V --------------> VDD GND --------------> GND ```