New 3D Magnetic Resolver IC with Triaxis Hall Technology Optimized for Robust Motor Design

Published  July 1, 2022   0
L Lakshita
3D Magnetic Resolver IC

Melexis has revealed the new AEC-Q100/ISO 26262 compliant pico-resolver MLX90381 that combines the advantages of a small outline and reliable analog outputs providing sine and cosine signals. This 3D magnetic pico-resolver with Triaxis Hall technology can be used for absolute rotary position sensing and, leveraging its low latency and fast response, measures rotational speeds of more than 50,000 rpm. This IC improves the low-speed accuracy, noise performance and supporting stall detection and can be used with DC, brushless DC (BLDC) and permanent magnet synchronous motors (PMSM) in applications such as e-valves and e-bike motors.

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. This IC features selectable magnetic field axes (X/Y - X/Z - Z/Y) and can handle on-axis position sensing as well as off-axis through-shaft sensing. 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.

Key Features

  • Smallest footprint DFN-6 package 2 x 2.5 mm2

  • Onboard programming through I2C protocol

  • 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

  • End-of-shaft / through-shaft operation

  • Package, RoHS Compliant: DFN-6 (LW) single die