Magnetic pico-resolver IC (Sin/Cos)
MLX90381 Melexis
The MLX90381 is a 3D magnetic resolver IC measuring rotational speeds of 50’000 e-rpm. It is optimized for robust motor design: smallest footprint, programmable at module level, cost-effective and ASIL-ready.
Top features
- Smallest footprint DFN-6 package 2 x 2.5 mm2
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Onboard programming through I2C protocol
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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
- Operating temperature from -40 °C to 160 °C
- Selectable magnetic field axis (X/Y - X/Z - Z/Y)
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Programmable sensitivity range
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mid field (10…70mT)
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high field (40…160mT)
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- End-of-shaft / through-shaft operation
- Package, RoHS Compliant: DFN-6 (LW) single die
Product description
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.
With its 3.3V 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.
Applications:
- 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-Ready.
An EVB90381 is available to get started.
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
- 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
Documents and tools
Datasheet(s)
Product flyer(s)
Selection guide(s)
IC handling and assembly
Magnet suppliers
Related tech talks
Videos
Magnetic pico-resolver IC (Sin/Cos)
The MLX90381 is a 3D magnetic resolver IC measuring rotational speeds of 50’000 e-rpm. It is optimized for robust motor design: smallest footprint, programmable at module level, cost-effective and ASIL-ready.
Fast pre-programmed magnetic resolver IC
With an update frequency of 4us, the MLX90380 is the fastest magnetic resolver IC based on Triaxis® technology. Additionally, this product gives mechanical designers a lot of design flexibility. It supports end-of-shaft applications. You can position the IC even parallel to the shaft. And you can position the IC next to the shaft, the so-called off axis.
