The dual-array version of the MLX90395 provides redundancy for demanding scenarios, such as shift lever position detection in automotive applications.
The functionality of the MLX90395 is defined through the system processor, rather than by connecting directly to the device. In terms of its applicability to position detection, it has a virtually unlimited range.
The MLX90395 offers I2C and SPI interfaces, facilitating its integration into an automotive or industrial control environment. The medium-field (50 mT) and high-field (120 mT) versions are available in three package options: SOIC-8, TSSOP-16 (dual array for redundancy), and QFN-16 (with wettable edges). All package options are AEC-Q100 rated, covering an extended temperature range from -40°C to +125°C, and are RoHS compliant.
The selectable digital output provides 16-bit resolution for X, Y, and Z magnetic field measurements, allowing the host processor, DSP, microcontroller, or digital signal controller to decode the absolute position of any magnetic field as it passes the sensor.
The MLX90395 is smaller and more energy-efficient than alternative Hall effect sensors, thanks in large part to Melexis's Triaxis® technology. This innovative, patented technology helps deliver low power consumption in industrial applications, with an idle current of 1.4 μA, a standby current of 2.4 μA, and a supply current of 4 mA or less.
Along with magnetic field sensors for measuring three fields (Bx, By, Bz), the MLX90395 also integrates a temperature sensor and a supply voltage monitor. Functionally, the sensor features three state machines and operates in one of three modes: single measurement, burst mode, and trigger-on-change mode. Engineers can select which magnetic field is measured and the measurement frequency to further fine-tune the sensor's energy efficiency, as well as the filtering and sampling times to optimize noise versus bandwidth.
"The MLX90395 represents a new way to sensing position for the automotive and industrial markets, one that can redefine how a wide range of HMI, top column, center column, and body control applications are designed," commented Nick Czarnecki, Global Marketing Manager for Position Sensors at Melexis. "Its strengths lie in its high sensitivity and versatility, along with its low power consumption and small size. Manufacturers now have access to the best-in-class automotive-grade 3D magnetic node sensing solution.".
Operating modes can be defined and selected at runtime via the I2C or SPI interfaces, allowing multiple sensors to form part of a sensor group controlled by a single microcontroller. The bus protocol (SPI or I2C) is also selectable, operating at up to 10 MHz for SPI and 1 MHz for I2C. Each sensor receives a unique 48-bit identification number during the manufacturing process and includes additional storage space for customer traceability information.
