3D magnetic position sensors are for cost-conscious automotive use

To measure absolute position accurately and safely in harsh and noisy environments over an extended temperature range, while catering to the cost-conscious customers, Melexis has expanded its portfolio of 3D magnetic position sensing solutions with the introduction of the MLX9042x series. 

The sensors are intended for applications such as powertrain actuators, transmission sensors, pedal position sensors and chassis sensors. In addition to the automotive market, they are also suitable for industrial customers, said Melexis.

The 3D magnetic positioning sensors are based on Melexis’ Triaxis Hall sensor and  feature analogue signal conditioning, data conversion and signal processing, as well as output stage drivers. 

There are five devices in the series. The MLX90421 is for rotary and linear use, with analogue or pulse width modulation (PWM) output. The MLX90422 is for rotary and linear use, with SENT output. The linear stray field immune MLX90423 is available with analogue, PWM or SENT output. The MLX90425 is a rotary 360 degrees stray field immunity model with analogue or PWM output and the MLX90426 is for rotary 360 degree stray field immunity with SENT output.

The MLX90423, MLX90425 and MLX90426 sensors are capable of rejecting stray magnetic fields (up to 5 mT or 4000A/m) in rotary and linear position sensing applications.

To ensure first-time-right EMC testing the MLX9042x requires only one test cycle, which keeps the design progressing quickly and the costs low, said Melexis. The high absolute maximum ratings (AMR), including reverse polarity, reduce the number of quality incidents due to electrical over-stress, the company added.

The devices are ASIL B -ready (per ISO 26262) and enable the design of functionally safe actuators and sensors to ensure safe operation of the vehicle. As well as single die versions, dual die versions are available for applications requiring higher levels of safety and availability.

The sensors support 160 degrees C operating temperatures. The high temperature capability enables position sensing applications in hot environments – such as small engine compartments or where start-stop conditions cause increased heat soaks.

Further devices will be added to the series in the future, confirmed Melexis.

The AEC-Q100-qualified MLX9042x devices can be supplied in SMD packages or in SMP-3 and SMP-4 PCB-less packages (where the sensor and EMC capacitors are integrated into a single mould). 


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