Complete brake pedal position sensor with wake-up function

The Melexis MLX90424 is a cost-effective solution for simplifying automotive brake pedal sensing. It incorporates two position-sensing ICs and a wake-up switch, all isolated in one package for functional safety purposes. The solution can be powered directly by 12V and handles precise linear displacement measurements up to 30mm.

Reaching the state of the art in safety-critical and space-constrained applications like automotive brake systems demands tailored sensors. The device delivers redundancy through its dual linear position sensing, while the integrated magnetic switch permits the implementation of a power-saving mode. Compared to a current brake pedal module, which includes separated position sensors and switches, the fully integrated device ensures that the position sensing and switching elements are placed together at the ideal location. This helps to reduce design and packaging considerations, simplifying assemblies and Bill of Material (BOM) component count. Also, the device offers supply flexibility, allowing it to be powered directly from the 12V battery without a regulator.

The device measures linear displacement up to 30mm and uses Melexis Triaxis Hall technology to supply stray field robustness. The combined sensor is AEC-Q100 qualified, with the position sensing function giving up to ASIL D system integration and the switch function supporting up to ASIL B in accordance with ISO 26262. It supplies reliable and highly integrated operation for safety critical braking operations and is robust against magnetic stray fields up to 5mT (4kA/m) – in accordance with ISO 11452-8.

“As an application-specific solution, the MLX90424 is a perfect demonstration of how Melexis contributes to brake pedal sensor technology and why it is the trusted market leader,” said Klaus Wilczek, Global Marketing Manager for Position Sensors at Melexis. “With this new solution, our team has developed a product that enables engineers to create simpler and more integrated designs.”