Functional safety magnetic angle sensing for brake pedal sensing

Melexis has put two of its MLX90423 three-axis magnetic flux sensors in the same package along with a magnetic wake-up sensor to detect linear and rotary movement in high-reliability applications such as brake and accelerator pedal position sensing in vehicles

Called MLX90424, it can be powered directly from 12V without a regulator and measures linear displacement up to 30mm without physical contact.

Rotary motion sensing – sensed linear motion would be from top to bottom across the IC in the diagram

The three dies are galvanically isolated, and multi-point programmable linearisation is possible.

“Reaching the state of the art in safety-critical and space-constrained applications like automotive brake systems demands tailored sensors,” according to the company. “MLX90424 offers redundancy through its dual linear position sensing, while the integrated magnetic switch allows the implementation of a power-saving mode.”

Qualification is to AEC-Q100, with position sensing up to ISO 26262 ASIL D and wake-up switching to ASIL B.

Stray magnetic fields up to 5mT (4kA/m) are tolerated in accordance with ISO 11452-8.

Packaging is TSSOP-16

MLX90424 product page

Infineon introduced simple automotive on-off sensors in April 2025 that have functional safety features

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Steve Bush

Steve Bush is the long-standing technology editor for Electronics Weekly, covering electronics developments for more than 25 years. He has a particular interest in the Power and Embedded areas of the industry. He also writes for the Engineer In Wonderland blog, covering 3D printing, CNC machines and miscellaneous other engineering matters.