Belgian electronic component vendor Melexis has introduced a two-wire switch that doesn’t need a printed circuit board (PCB) for position detection across automotive and industrial systems such as seatbelt buckles.
Called the MLX92342, the programmable Hall-effect sensor delivers a valid safety signal in less than 100 µs. The electronic component is targeted for automotive OEMs that are moving toward zonal control with sensing functions placed at remote endpoints and processing and intelligence consolidated in central or zonal electronic control units (ECUs).
Melexis said the shift to zonal control is increasing the need for position and latch sensors that are reliable enough to sit close to the mechanical function. Additionally, these sensors must:
- Operate without a local PCB
- Reduce wiring
- Deliver diagnostic and safety performance
The MLX92342 is designed as an ISO 26262 Automotive Safety Integrity Level B (ASIL B) Safety Element out of Context (SEooC), Melexis said.
The MLX92342 sensor enables a connection to an ECU through a two-wire interface to reduce the complexity compared to conventional three-wire offerings. It serves as an option for applications that are currently using mechanical microswitches, reed switches or less advanced magnetic switches. Compared with those options, the sensor adds programmability and diagnostics, and unlike microswitches, it operates without physical contact, Melexis said.
In applications like seatbelt buckle detection, the sensors’ faster output compared to traditional devices helps reduce timing constraints during system checks and production testing while supporting earlier safety responses, the company said.
The sensor has two diagnostic operating modes for different application requirements. A sequential mode supports switch and end-position detection, including seatbelt buckles and:
- Brake fluid level sensing
- Locks
- Flaps
A parallel mode provides faster magnetic updates for latch-based applications such as:
- Motor commutation in window lifters
- Valves
- Gear mechanisms
