MLX90423 is cost-effective for space-limited ADAS, says Melexis

The latest 3D magnetic position sensor in the MLX9042x series by Melexis is the MLX90423. It blends high accuracy for long strokes (up to 30mm), stray field immunity (SFI) and ISO26262 (supports up to ASIL D system integration). It is, said Melexis, a cost-effective solution for automotive ADAS applications with space constraints such as braking systems (brake rod).

The MLX09423 incorporates the company’s Triaxis Hall technology for linear displacement (absolute linear) up to 30mm where stray field rejection is needed. The sensor is a single die ASIL C (ISO 26262) model while dual die option is also available to support up to ASIL D system integration. In common with other members of the series, it has EMC characteristics and improved accuracy over the full thermal range.

The monolithic magnetic position processor IC consists of a Triaxis Hall-based magnetic front end, an analogue to digital signal conditioner, a DSP and a programmable output stage driver. By sensing the three components of the magnetic flux density applied to the ICs (Bx, By and Bz), the MLX90423 decodes the absolute position of a magnet moving linearly. This enables engineers to control applications such as brake rod travel, pedal position or park lock actuators. 

The MLX90423 provides ratiometric analogue output, PWM output or SENT (single edge nibble transmission) frames encoded according to a secure sensor format. In accordance with ISO 11452-8, it is robust against magnetic stray field up to 5mT (4kA per metre).

In common with other sensors in the series, the MLX90423 aims to ensure first-time-pass EMC testing for efficient design processes. The high absolute maximum ratings (AMR), including reverse polarity, reduce the number of quality incidents due to electrical overstress, added Melexis.

All MLX9042x devices are designed for operational temperatures up to 160 degrees C and are AEC-Q100 qualified. They can be supplied in SMD packages or in SMP-3 PCB-less packages which integrate the sensor and EMC capacitors in a single mould. 

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