MLX90381 / Magnetic pico-resolver IC (Sin/Cos)
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
- Smallest footprint DFN-6 package 2 x 2.5 mm2
- Onboard programming through I2C protocol
- Programmable at module level
- ISO 26262 ASIL B SEooC (Safety Element out of Context)
- AEC-Q100 Qualified
- Triaxis® Hall technology
- Sine and Cosine analog outputs
- Output refresh rate 2 µs
- Measure rotational speeds of more than 50’000 e-rpm (Electrical at Hall plates)
- Ratiometric outputs
- Operating supply voltage 3.3 V or 5 V
- Operating temperature 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
- Package, RoHS Compliant: DFN-6 (LW) single die
MLX90381 Application Examples:
- Absolute Rotary Position Sensor
- Brushless Motor Control
- Permanent Magnet Synchronous Motor
- Brushless DC Motor (BLDC)
- Field-Oriented Motor Control
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 B.
With its 3.3V or 5V supply, high speed, small size, and flexible configuration the MLX90381 is ideal for use in motor control applications when paired with a suitable microcontroller. 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.
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