Dual-input inductive sensor simplifies design
Melexis introduces the MLX90514, a dual-input inductive sensor IC that simultaneously processes signals from two sets of coils to compute differential or vernier angles on-chip. The inductive sensor targets automotive applications, such as steering torque feedback, steering angle sensing, and steering rack motor control.
Traditionally, designers have combined two single-channel ICs or used magnetic sensors for many applications, Melexis said. However, with the move to electrification, autonomy, and advanced driver-assistance systems (ADAS), vehicle control systems have become more complex particularly in systems such as steering torque feedback, steering rack motor control, including steer-by-wire implementations, which need dual-channel position sensing to deliver accurate torque and angle measurements.
By integrating differential and vernier angle calculations on-chip, the MLX90514 reduces processing demands on the host system, enabling smaller and more streamlined sensor designs. By computing complex position information (such as differential or vernier angles) directly at the sensor it eliminates the need for multiple ICs, which reduces design complexity and component count.
The MLX90514 is Melexis’ first dual inductive application-specific standard product (ASSP). It offers several interface options—including SENT, SPC, and PWM for a standalone module, and SPI for embedded modules—with integrated on-chip processing. The SENT/SPC output accommodates up to a 24-bit payload, enabling high-fidelity transmission of two synchronized 12-bit channels, which is required for high-accuracy torque and angle sensing.
Key features include zero-latency synchronized dual-channel operation, external pulse-width-modulation (PWM) signal integration that allows reading PWM signals from external sources, and the capability to handle small inductive signals, which supports compact coil designs and tighter printed-circuit-board layouts for smaller sensing modules.
The MLX90514 enables ASIL-D-compliant sensing systems, as a Safety Element out of Context (SEooC), for automotive steering torque and angle applications. The inductive interface sensor is available now.
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