KMZ49,118: A High-Precision TMR-Based Angular Position Sensor from NXP

In the realm of advanced sensing technology, precise and reliable angular position measurement is a cornerstone for numerous industrial, automotive, and consumer applications. Addressing this critical need, NXP Semiconductors introduces the KMZ49,118, a state-of-the-art magnetic angular position sensor that leverages the exceptional properties of Tunneling Magnetoresistance (TMR) technology. This device sets a new benchmark for performance, offering system designers a superior solution for demanding environments.

The core innovation of the KMZ49,118 lies in its use of TMR sensor elements. Compared to traditional Hall-effect or Anisotropic Magnetoresistance (AMR) sensors, TMR technology provides a significant leap in performance. It delivers a much higher signal amplitude, resulting in an outstanding signal-to-noise ratio (SNR). This inherent advantage translates directly into higher precision, enabling accurate angle measurement with remarkably low jitter. Furthermore, TMR elements are renowned for their high sensitivity and excellent thermal stability, ensuring consistent operation across a wide temperature range from -40 °C to 150 °C.

The KMZ49,118 is engineered for 360° angular position detection. It integrates two TMR-based Wheatstone bridges, positioned orthogonally (sine and cosine), to measure the in-plane component of a magnetic field. This configuration allows the sensor to calculate the absolute angle of a rotating two-pole magnet. The device outputs two analog signals corresponding to the sine and cosine of the angle, which can be processed by an external microcontroller (MCU) to compute the precise angular position with high resolution.

Key features that make the KMZ49,118 a standout choice include:

High Accuracy and Resolution: The TMR technology enables ultra-low angular error across the full 360° range, which is crucial for applications like robotics and servo motors.

Wide Operating Temperature Range: Its robust performance from -40 °C to 150 °C makes it ideal for harsh automotive applications such as electronic power steering, throttle control, and transmission systems.

Low Power Consumption: The sensor operates from a single 5 V supply and consumes very low current, benefiting power-sensitive designs.

High Resilience to External Stray Fields: The design incorporates strong immunity to external magnetic interference, a common challenge in electrically noisy environments.

Typical applications span across various industries, including industrial automation (encoders, robotic arms), automotive (brake pedals, throttle valves, gearbox position sensing), and consumer products (knobs, dials, and smart home devices).

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In summary, the KMZ49,118 from NXP represents a significant advancement in magnetic sensing. By harnessing the power of Tunneling Magnetoresistance (TMR) technology, it delivers unmatched precision, robustness, and reliability for critical angular position sensing tasks. For engineers seeking a high-performance solution to elevate their system's capabilities, the KMZ49,118 is a premier choice.

Keywords: Tunneling Magnetoresistance (TMR), Angular Position Sensor, High-Precision, NXP, Automotive Applications