🚀 3D Position Sensing Solution for Compact Motor Systems!

[Elif Özaksu]

🚗 Revolutionizing Next-Generation Motor Control: Melexis MLX90381 5V​

Melexis has introduced the MLX90381 5V, a compact magnetic pico-resolver designed for automotive and robotic applications requiring high-speed rotor feedback in confined spaces. This 5V analog resolver optimizes motor control even in restricted mechanisms thanks to flexible sensor placement.

⚙️ Seamless Integration Even in Tight Spaces​

Traditional sensor mounting can be challenging in applications such as electronic valves, seat mechanisms, and brake and steering motors. The MLX90381 5V overcomes this by measuring magnetic flux density in three dimensions using Triaxis Hall technology. It offers the flexibility to choose between X/Y, X/Z, or Z/Y magnetic axis pairs, allowing the sensor to be mounted adjacent to or beneath the magnetic tracker. This eliminates the need for additional lateral clearance and simplifies PCB geometry in dense mechanical assemblies.

⚡ High-Speed Performance and Precise Signal Processing​

This sensor generates high-speed sine and cosine analog signals to provide continuous, real-time position data to the system. Operating on a standard 5V supply, the resolver can accurately measure rotational speeds exceeding 50,000 RPM with a low latency of 2 microseconds. An integrated I²C communication interface for production line calibration allows for optimization of accuracy and filter bandwidth.

🌡️ Thermal Reliability and Automotive Qualification​

Available in a standard DFN-6 package measuring 2.0 mm x 2.5 mm x 1.0 mm, the MLX90381 5V operates stably across a wide temperature range from -40°C to 160°C. Equipped with internal diagnostic capabilities to meet safety-critical automotive requirements, the product is AEC-Q100 qualified and ASIL B Safety Element out of Context (SEooC) ready. This compact design eliminates integration bottlenecks associated with standard solid-state sensing components.

💡 Why 3D Hall-Effect Sensors?​

While traditional TMR position sensors offer high angular accuracy, they are typically limited to planar (X/Y) field measurement. This requires precise alignment of the sensor to the shaft end or parallel to the dipole magnet. 3D Hall-effect technology, such as the Triaxis mechanism in the MLX90381, offers the ability to calculate position from out-of-plane magnetic fields (X/Z or Y/Z). This prioritizes mechanical packaging flexibility, especially in applications where axial alignment is physically obstructed, such as e-bike drive systems and compact robotic joints.