Dual-output position sensor reduces component count

March 20, 2019 //By Christoph Hammerschmidt
Dual-output position sensor reduces component count
Melexis’ Triaxis Hall sensor is now already in the third generation. New is that designers for a range of applications now do not need a second position sensor anymore. The reason: The new MLX90374 offers multiple outputs from a monolithic device.

Based on the Belgian’s microelectronics company’s proprietary 3D Hall sensing technology, the MLX90374 provides the absolute position of a moving magnet, covering 360° rotation and linear displacement. It  achieves this in a single chip solution, through the integration of a magnetic front-end, ADC and DSP, along with a temperature sensor and signal conditioning block for an optional external sensor. The monolithic IC provides two independently configurable output stages, the primary output can encode position data in either SENT protocol or via pulse width modulation (PWM), the second output provides position data encoded as a 12-bit PWM signal. The second output of the MLX90374 ABB can optionally operate as a switch signal with programmable thresholds, while the MLX90374 ABC variant features an additional third output that is also configured as a switch. Each of the outputs is powered by the on-chip DSP and takes either the on-chip magnetic data as its source or an external sensor input. 

With ISO 26262 ASIL C (SEooC) readiness, an ambient operating temperature range of up to +160°C and low thermal drift, the MLX90374 is targeting automotive applications such as Transmission Range Selection (TRS) sensing or inhibitor switches. It can also be used to detect the position of pedals, steering wheel or seat height, as well as in the drivetrain. 

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