The MLX90381 is a 3D magnetic resolver IC measuring rotational speeds of 50’000 e-rpm (Electrical at Hall plates). It is optimized for robust motor design: smallest footprint, programmable at module level, cost-effective and ASIL-ready.

The MLX90381, Triaxis® pico-resolver, is a monolithic contactless sensor IC sensitive to the flux density applied in three dimensions (X, Y, Z) to the IC. Two, selectable, axes can be mapped to the two high-speed analog outputs allowing the MLX90381 to be used for on-axis and off-axis (through-shaft) position sensing when paired with a moving permanent magnet.

• Normal or lateral magnetic sensitivity options X (Y) or Z
• Output current up to 100 mA (AMR 200 mA)
• Operating temperature from -40°C to 150°C
• Package RoHS compliant TSOT-6L
• Output isolated from the supply voltage Silicon-on-Insulator (SOI) OUTA/OUTB potentials can be below GND or above VDD
• Programmable magnetic thresholds and threshold temperature coefficient
• Low average supply current – 180μA typical
• Built-in daisy-chain functionality to synchronize multiple ICs
• Programmable magnetic Latch, Unipolar and Omnipolar Switch function
• Typical R_on of 3Ω
• Operating voltage range from 4.5V to 28V
• Under-Voltage Reset protection
• Thermal protection

• Reed switch replacement
• Direct load driving
• Fluid level meter applications 
• Applications for level measuring devices 
• High-Side / Low-Side switch

With a wide operating temperature and magnetic flux density range, the MLX90381 can resolve the angular position of a rotating axis over 360 degrees in many industrial and automotive applications. With a low response time and latency, the MLX90381 can measure rotational speeds of more than 50’000 e-rpm (Electrical at Hall plates). Each axes’ sensitivity and filter bandwidth can be programmed directly on board using I2C protocol through 2 application pins to tailor the output to the ADC input range of the companion MCU. No external programming tool is therefore needed.

The small DFN-6 package (2.0 mm x 2.5 mm x 1.0 mm), requiring only three external capacitors, minimizes PCB board area enabling compact designs. The MLX90381 is RoHS compliant with matte-tin plated, wettable flanks. Typical applications of the MLX90381 resolver are automotive E-valves, Thermovalves, EPS or brake. The MLX90381 improves the low-speed accuracy, noise performance and supports stall detection. It can be used in automotive safety-related systems as it is AEC-Q100 qualified and ASIL-Ready.