What if one sensor could replace several switches inside a vehicle? A new approach to position detection could reduce wiring, save space, and simplify vehicle designs.
Automotive designers may soon be able to replace multiple mechanical switches with a single sensor for position detection. Melexis has developed the MLX92344, a 2-wire Hall-effect switch capable of detecting up to four positions while remaining compatible with existing vehicle electronic control units (ECUs) and wiring architectures.
The device is designed for automotive body electronics applications including seat-track position monitoring, e-frunk and trunk latches, charging ports, control buttons, and soft-closing doors. By providing multiple position outputs from a single contactless sensor, it can reduce wiring, free up installation space, and simplify system design compared with conventional microswitch-based solutions.
A key feature of the switch is its ability to generate up to four programmable output states. Engineers can assign different current levels to magnetic operating and release points, allowing the sensor to emulate traditional microswitch interfaces without requiring hardware changes. Position information can be read through standard digital inputs or analog-to-digital converters, requiring only software adjustments in many systems.
To support different vehicle designs, key parameters such as switching thresholds, output currents, diagnostic functions, and the number of output states are stored in on-chip non-volatile memory. End-of-line programming also allows manufacturers to compensate for mechanical tolerances during production.
Some of the key specifications of the MLX92344 include:
- Operating voltage range: 2.7 V to 28 V
- 32 V absolute maximum rating for truck applications
- Operating temperature range: -40°C to +150°C
- Qualified to AEC-Q100 automotive standards
- Developed as an ASIL B Safety Element out of Context (SEooC)
- Available in TSOT23-3L surface-mount and TO92-3L through-hole packages
- ESD protection up to 8 kV Human Body Model (HBM)
- System-level ESD protection up to 15 kV
“With this programmable architecture, we give automotive engineers a smarter way to replace multiple microswitches while improving on safety requirements,” said Minko Daskalov, Product Line Director at Melexis. “By combining configurable current outputs linked to magnetic switching thresholds, the MLX92344 enables engineers to design smaller, safer, and more flexible body electronics systems.”
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