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Melexis — MLX90384 Arcminaxis® Magnetic Position Sensor

 

Melexis — MLX90384 Arcminaxis™ Magnetic Position Sensor

 

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Melexis MLX90384 Magnetic Position Sensor

Perfect for robotic joints among other key applications

Melexis features the MLX90384, a high-precision magnetic position sensor for robotic joints. Featuring Arcminaxis® technology, it comes with a magnet and software to calibrate and operate the system.

The MLX90384 sensor comes as a four-component set:

  1. A sensor chip with two monolithic magnetic position sensor ICs, each consisting of a Triaxis® Hall magnetic front end, analog-to-digital converter, hardware for high-speed signal conditioning, and a 10MHz high-speed SPI interface. The ICs are both configured to be sensitive to a first magnetic flux density component parallel to the chip and to a second component perpendicular to the chip.
  2. A Vernier-type magnet, with two tracks of eight and seven pole pairs. The MLX90384 sensor chip measures the axial and tangential magnetic components of both tracks and transmits this information to a microcontroller which in turn generates the accurate angular position and speed as well as the counted turn out of this information.
  3. A precompiled software package for an STM32 microcontroller to calibrate and operate the system.
  4. A complete reference design to build your encoder solution based on 1), 2) and 3)

Features

  • Resolution up to 18 bits
  • Pitch-independent, one IC fits various magnets
  • High speed with fast SPI interface
  • Arcminaxis® Technology combining Multi-axis sensing with Vernier Technology
  • TSSOP-16 Sensor Package RoHS compliant
  • Reduces the complexity and effort involved in assembling robotic joints
  • Large air gap sensor to magnet (1.5 mm nominal)
  • Generous magnet-sensor placement tolerance of ±0.5 mm
  • Supply 3.3 V
  • Temperature range -20°C to 85°C

Applications

  • Absolute Rotary Position Sensor
  • High Accuracy Encoder
  • Robotic Joint Encoder
  • E-Mobility
  • Industrial Motors

 

Melexis MLX90384 Diagram

 

Arcminaxis® Technology

Arcminaxis® is an advanced position-sensing technology designed for robotic joints, offering high-resolution, cost-effective precision. It leverages multi-axis sensing and Vernier technology for a compact, easy-to-integrate solution. Unlike traditional magnetic encoders, which measure a single magnetic field component, Arcminaxis® uses two sensing areas to capture orthogonal magnetic field components (axial and tangential). Its dual-track magnet design (Master and Nonius tracks) enhances accuracy, reduces sensor placement constraints, and supports larger magnet poles for improved precision.

 Melexis Arcminaxis® Technology

 


Melexis MLX90384 Arcminaxis Magnetic Position Sensor

 

Melexis: Arcminaxis® Position Sensing Technology for Robotic Joints 3