The MLX90427 is an advanced Hall-effect magnetic position sensing integrated circuit that offers improved performance and reduced costs compared to previous-generation Melexis embedded position sensors. Leveraging Melexis' extensive experience in magnetic sensing technology, the MLX90427 is designed for embedded position sensor applications, featuring high-speed communication and 14-bit output resolution.
For industrial applications, the MLX90427 provides an additional layer of safety and reliability with its integrated SFI function, ensuring stable operation even in environments with high magnetic interference. This makes it particularly beneficial for industrial joysticks, steering systems, and selector wheel controls in heavy machinery, medical devices, and automation equipment where safety is paramount. Furthermore, unlike mechanical potentiometers, the contactless design eliminates wear and drift, improving longevity and reducing maintenance costs.
The MLX90427 is ideal for controllers requiring fast response times, high accuracy, and longevity that surpasses alternative solutions based on magnetometers or potentiometers. The embedded Triaxis sensing element detects magnetic flux density in three directions (Bx, By, and Bz), providing precisely calculated angle outputs from the controller's joysticks without the need for extensive external processing. Offering a more cost-effective alternative to previous Melexis embedded position sensors, the MLX90427 is an ideal solution for controlling joysticks and other HMI peripherals where accurate and highly responsive input is critical.
With multiple operating modes, the MLX90427 sensor is suitable for a wide range of deployments, from heavy machinery control to consumer applications. Ideal for HMIs and controllers, the first of two joystick-compatible operating modes provides direct, high-precision measurement of alpha and beta angles using a single MLX90427 IC mounted beneath a joystick.
Alternatively, in environments susceptible to magnetic interference, a dual-sensor configuration (one sensor per axis) operating in rotary mode with SFI is recommended. This configuration provides consistent and accurate performance, which is essential in demanding industrial applications requiring high reliability. Further expanding its versatility, the MLX90427's magnetometer mode offers simple XYZ field measurements for applications such as jog wheels, where simplicity and accuracy are critical.
The MLX90427 provides engineers with easier access to contactless sensor technology, offering improved reliability over mechanical potentiometers by eliminating mechanical wear and drift, while also achieving lower costs than its predecessor, the Melexis magnetic model. For manufacturers of industrial and consumer equipment, the inherent robustness of contactless sensing ultimately enhances device durability and longevity, helping engineers improve reliability and reduce maintenance costs.
The integrated circuit's core sensing functionality is supported by an analog-to-digital converter (ADC), a robust digital signal processor (DSP) for sophisticated signal processing, and an output stage driver for high-speed, full-duplex SPI output for communication with a master microcontroller. Seamless system integration is ensured by the MLX90427's robust functional safety credentials, precise factory calibration, wide operating temperature range (from -40°C to +160°C), and compatibility with both 5V and 3V power supplies.
“The MLX90427 is an excellent example of Melexis’ commitment to advancing the reliability of contactless magnetic sensing technology in new applications,” said Atanas Dikov, marketing director at Melexis. “With its multifunctional capabilities and focus on cost-effectiveness, this sensor will help engineers transform the joystick and HMI application landscape, delivering new levels of accuracy, reliability, and value.”.
