Automotive Grade Monolithic Hall Effect Sensor for Three Dimensional Contactless Sensing

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ByDinesh Kumar 0

MLX90395 Automotive Grade Monolithic Hall Effect Sensor

Melexis announces the MLX90395 Triaxis Magnetometer Node, an automotive-grade (AEC-Q100) monolithic Hall effect sensor that provides contactless sensing in three dimensions. The sensor is also available in a dual-die version which provides redundancy for demanding scenarios such as gear level position sensing in automotive applications. The Triaxis technology leads to the development of the smaller and more power-efficient hall effect sensor that has an industry-low power consumption, with an idle current of 1.4 μA and a standby current of 2.4 μA, and supply current of 4 mA or less.

The MLX90395 provides both I2C and SPI interface for simple integration with the automotive and industrial control environment. Both medium-field (50 mT) and high-field (120 mT) versions are available in three package options: SOIC-8, TSSOP-16 (dual-die for redundancy), and QFN-16 (with wettable flanks).

The RoHS compliant MLX90395 operates in an extended temperature range of -40 °C to +125 °C. The MLX90395 has an integrated temperature sensor, a supply voltage monitor, and magnetic field sensors that can measure three fields (Bx, By, Bz). The sensor is designed with three state machines and operates in one of the three modes: single measurement, burst mode, and wake-up on change mode. The sensor’s efficiency can be fine-tuned by selecting which magnetic field is measured and the frequency of measurement. Engineers can also select the filtering and sampling time to optimize noise vs bandwidth.

The I2C or SPI interface can be used to define and select operational modes to allow multiple sensors to form part of a sensor cluster, controlled by a single microcontroller. The bus protocol (SPI or I2C) is also selectable, running at up to 10 MHz for SPI and 1 MHz for I2C.

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