MLX90381 / Triaxis® Magnetic pico-resolver
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.
MLX90381 / Triaxis® Magnetic pico-resolver
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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. |
MLX90381 Features and benefits
- Triaxis® Hall technology
- Sine and cosine analog outputs
- Output refresh rate 2 μs
- 3.3V operating supply voltage
- Operating temperature range from -40°C to 160°C
- Selectable magnetic field Axis (X/Y - X/Z - Z/Y)
- Programmable sensitivity range
Mid field (10…70mT)
High field (40…160mT) - End-of-Shaft / Through-Shaft operation
- Ratiometric outputs
- ISO26262 ASIL B safety element out of context
- AEC-Q100 qualified
- Onboard programming through I2C protocol
- DFN-6 single die RoHS compliant package
MLX90381 Application Examples:
- Absolute rotary position sensor
- Automotive and industrial applications
- E-valves
- E-bike motors
- Brushless motor control
- Permanent magnet synchronous motor
- Brushless DC motor (BLDC)
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.
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