The Electronic Enthusiast Network reports (by Wu Zipeng) that position sensors play a critical role in the industrial sector, capable of detecting parameters such as the position, displacement, distance, and angle of objects, thereby enabling automation control, precise positioning, and status monitoring. With continuous technological advancements, the application scenarios for position sensors are becoming increasingly widespread, significantly promoting the development of industrial intelligence.Position sensors come in a variety of types, including photoelectric, contact, ultrasonic, encoders, electromagnetic, as well as visual and image-based sensors. Among them, electromagnetic position sensors can be further divided into inductive proximity sensors, capacitive proximity sensors, Hall effect sensors, and magnetostrictive displacement sensors.The Melexis MLX90427 is an advanced Hall effect magnetic position sensing chip. Compared to previous generations of Melexis embedded position sensors, it not only offers superior performance but also lower costs. Leveraging Melexis’s deep expertise in magnetic sensing technology, the MLX90427 is specifically designed for embedded position sensor applications, supporting high-speed communication and achieving 14-bit resolution output.
Integrated SFI: Enhancing Sensor Interference Immunity
In the field of position sensors, SFI typically refers to Stray Field Immunity, which is a key technical indicator that measures a sensor’s ability to resist external magnetic field interference and maintain high precision detection capabilities in complex electromagnetic environments. The importance of SFI functionality is particularly highlighted in scenarios with strong electromagnetic interference, such as automotive electronics and industrial automation.SFI encompasses several key technical indicators: firstly, interference resistance strength, usually measured in mT (millitesla) or A/m (amperes per meter); a higher value indicates greater reliability of the sensor in complex environments; secondly, temperature stability, with some sensors supporting a wide operating temperature range of -40°C to +160°C, maintaining stable SFI performance across the entire temperature range, suitable for high-temperature environments like engine compartments; thirdly, response speed, where in high-speed scenarios (such as motor control), the sensor must complete signal processing and interference correction within nanoseconds to avoid position lag during dynamic processes.There are various methods to achieve SFI. SFI based on differential sensing technology collects magnetic field signals using multiple symmetrically arranged Hall elements (e.g., North/East/South/West directions) and uses differential calculations to cancel out interference from external stray magnetic fields; SFI with chip-level interference design employs a stacked dual-chip design to enhance interference immunity through physical layout and circuit optimization; SFI achieved through multi-axis magnetic field detection and fusion allows the sensor to simultaneously detect magnetic field components in the Bx, By, and Bz directions, and combines DSP algorithms to separate the target magnetic field from stray fields, thus enabling high-precision linear displacement detection.The SFI of the MLX90427 employs a multi-axis magnetic field detection and fusion approach, making it highly sensitive to the three components of magnetic flux density applied to the chip (BX, BY, and BZ). Coupled with a powerful digital signal processor (DSP) for complex signal processing, it ensures reliable and safe performance, making it an ideal choice for applications such as joysticks, steering wheels, and thumbwheels.
Supports Four Multi-Functional SPI Output Modes, Adapting to Diverse Industrial Needs
According to reports, the MLX90427 integrates a Triaxis® Hall magnetic sensing front end, an analog signal conditioner, a DSP with advanced signal processing capabilities, and an output stage driver chip, making it a highly integrated magnetic position sensor chip designed for modern embedded applications, featuring high safety, electromagnetic compatibility robustness, and stray field immunity.Targeting industrial applications, the MLX90427 enhances system safety and reliability by integrating SFI functionality, ensuring stable operation even in high magnetic interference environments. Thanks to the SFI technology based on multi-axis magnetic field detection and fusion, this product can sense moving magnets in the surrounding environment and decode their positions through signal processing without complex external processing, allowing for precise angle output from the controller joystick.Additionally, the MLX90427 perfectly adapts to controllers that require fast response, high precision, and long lifespan, supporting four multi-functional SPI output modes: rotation, joystick, rotation (anti-stray magnetic field), and raw data mode, providing high flexibility to meet diverse application needs.Moreover, the MLX90427 boasts numerous advantageous features: digital signal processing based on a 16-bit RISC microcontroller, integrated 14-bit output resolution ADC, compatibility with 5V and 3.3V applications, an operating temperature range of -40°C to 160°C, and compliance with ISO 11452-8 standards, demonstrating strong interference immunity against stray fields up to 5mT (or 4kA/m)..Melexis marketing manager Atanas Dikov stated: “The MLX90427 exemplifies Melexis’s commitment to pushing the reliability of non-contact magnetic sensing technology into new applications. With its multifunctional features and focus on cost-effectiveness, this sensor will help engineers reshape the joystick and HMI application landscape, providing unprecedented precision, reliability, and value.”
Disclaimer: This article is originally from the Electronic Enthusiast Network, please indicate the source above when reprinting. For group discussions, please add WeChat elecfans999, for submission of interview requests, please email [email protected].
More Hot Articles to Read
-
Baido and Tencent are competing for market share! Behind the upgrade and open-source of DeepSeek-R1 is the counterattack path of domestic AI
-
The GPU beast is coming! HBM4 and AI servers are completely igniting!
-
The smart glasses track is heating up! What major moves are Qualcomm, Allwinner, ST, and Starshine Technology making?
-
China’s EDA industry autonomy: the road is long and arduous, but progress will be made
-
The EDA ban is about to arrive! The Chinese chip industry faces a desperate battle
Click to Follow and Star Us
Set us as a star to not miss any updates!