Both devices consist of a Triaxis Hall magnetic front end, an analog to digital signal conditioner, a DSP for advanced signal processing and an output stage driver. Due to the Integrated Magneto Concentrator (IMC) they are sensitive to magnetic flux in three planes (X, Y & Z). This facilitates the decoding of the absolute rotary or linear position of any moving magnet, enabling the design of non-contact position sensors. The MLX90371 offers analog or PWM output while the MLX90372 offers SENT (SAE J2716 rev Apr 2016) or PWM output.
A key feature of both parts is the robustness against stray fields that are increasingly present due to the electrification of modern vehicles, especially EV and HEV. By measuring a magnetic field gradient, the device is intrinsically insensitive to stray fields up to 4kA/m (or 5mT), which are the levels required by many major automotive manufacturers. Their ability to operate with a reduced magnetic field means that smaller and lower-cost magnets can also be used – ideal for space- and cost-constrained automotive applications.
The MLX90372 device includes an additional input pin that makes it possible to fully integrate other sensors (such as temperature, pressure, or switch inputs) allowing for the additional signal to be transmitted over the SENT output, reducing wire harness size and complexity.
Melexis – www.melexis.com