Micronas dual output Hall sensor combined with multi-dimensional measurement and redundancy

Photocoupler

Micronas has recently expanded its direct angle sensor product line with the introduction of the dual-output HAR37xy. This new sensor integrates two fully automotive-compliant, high-precision outputs for both direct-angle and linear position measurement within a compact SOIC8 package. It is designed to meet the strict requirements of demanding automotive and industrial applications, offering support for ISO 26262-compliant safety-critical systems and true redundancy in a small footprint.

The HAR37xy is well-suited for use in automotive and industrial environments where operating temperatures range from –40°C to 170°C. It is ideal for applications such as clutch position detection in transmissions, body height modules, engine gas management (like EGR systems), throttle position sensing, and turbocharger actuators. The device features non-volatile memory that remains stable across a wide temperature range, ensuring reliable performance under harsh conditions.

Each HAR37xy consists of two Hall elements that are glued together and feature an electrical contact compensation design, known as stacking. These outputs operate independently both mechanically and electronically, with their placement at opposite ends of the package to prevent short circuits. The stacked configuration ensures that both Hall elements detect nearly identical magnetic fields, resulting in synchronized output signals for accurate measurements.

The compact redundancy design not only reduces system costs but also enhances overall stability by minimizing PCB size and solder joints. Customers have the flexibility to choose between single or dual output configurations during assembly. Both the dual-output HAR37xy and the single-channel HAL37xy come in SOIC8 packages, making it easy for users who have already adopted the single-channel version to transition without significant redesign. They can continue using the same magnetic circuits and modules, accelerating time-to-market. Additionally, the dual Hall element layout allows for the use of smaller magnets than competitors, improving efficiency and reducing material costs.

A standout feature of the HAR37xy is its “virtual compensation” parameter, which helps customers further reduce magnet costs. This function enables magnets up to 10 mm in length to measure linear displacement of up to 40 mm, effectively reducing magnet size by approximately 30% without compromising performance. High-precision measurements of small magnets become more achievable, making the sensor versatile for various applications.

For accurate angular measurement, the HAR37xy utilizes a unique pixel chip that includes one horizontal (BZ) slice and two vertical (BX, BY) slices. The horizontal slice captures the magnetic field perpendicular to the chip's surface, while the vertical slices detect the field in the plane of the chip. This multi-directional sensing capability ensures precise and consistent angular readings, even in complex environments.

Micronas is now offering samples of the HAR37xy, along with user-friendly LabViewâ„¢ software and comprehensive application notes to assist even novice system designers in speeding up their development process. The product is scheduled for mass production starting in early 2016, marking a significant step forward in precision sensing technology for automotive and industrial markets.