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The world's first pico-resolver: beyond miniaturisation

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Melexis introduces the AEC-Q100/ISO 26262 compliant 3D magnetic pico-resolver MLX90381, offering ease of use and reliability for industrial and automotive applications.

Its tiny DFN-6 package (2 x 2.5 mm) allows mechatronic miniaturisation with sensors.

This ASIL-ready solution is programmable at module level and is best suited for rotor position detection.

This device combines the advantages of a low profile and reliable analogue outputs providing sine and cosine signals.

UtilisingMelexis' uniqueHall Triaxis technology, the MLX90381 is easy to use for rotor position sensing.

The MLX90381 can be used for absolute rotational position measurement and, taking advantage of its low latency and speed of response, for measuring rotational speeds of over 50,000 rpm.

The pico-resolver improves low-speed accuracy, noise performance and supports stall detection.

It can be used with DC, brushless DC (BLDC) and permanent magnet synchronous motors (PMSM) in applications such as electronic valves and electric bicycle motors.

It is also suitable for automotive safety-related systems as it complies with AEC-Q100 and ISO 26262 (ASIL B SEooC) standards.

The MLX90381 combines easily with Melexis' LIN family of intelligent integrated drivers.

These include the MLX81330/32 (up to 10 W) for direct drive of flaps, valves, fans and single-coil pumps.

In addition, it works with MLX81340/44/46 pre-drivers (up to 2000 W) that are incorporated in fans, engine cooling fans, pumps, window lifters, seat adjusters and sunroofs.

With its selectable magnetic field axes (X/Y - X/Z - Z/Y), the MLX90381 pico-resolver can handle on-axis position sensing and off-axis measurement through the shaft.

Through the device's I2C interface, the sensitivity and filter bandwidth of each axis can be directly programmed.

A dedicated high-sensitivity version of the pico-resolver offers additional robustness against external parasitic magnetic fields.

The MLX90381 is housed in a compact DFN-6 package. It requires only three external capacitors to complete the circuit.

Comments

"The MLX90381 pico-resolver is our most versatile and safe resolver offering the smallest footprint available on the market," says Dieter Verstreken, Global Marketing Manager Position Sensors at Melexis. "When combined with our LIN motor driver family, the result is a convenient Sense & Drive solution for actuation and position sensing. This helps our customers address a wide variety of challenges such as miniaturisation, safety and programmability."

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