TDK Expands Micronas Family of 3D Magnetic Position Sensors

TDK has expanded its Micronas position sensor portfolio with a new member of its masterHAL sensor family. The new HAL 3900 features real 3D magnetic-field measurement capability and 2D stray-field robust position detection. 

The heart of the sensor is the company’s patented 3D HAL pixel cell technology. It not only helps to measure magnetic fields very accurately, but also enables the measurement of all three magnetic-field components at one single spot. 

The sensor offers four different measurement modes in a single device — linear position detection, rotary 360° angle detection and rotary 180° angle detection with stray field compensation including gradient fields as well as 3D magnetic field measurement. 

By measuring the three dimensions, the sensor can detect the direction of the magnetic field. At the same time, its array of Hall plates offers a 2D stray-field compensation, helping design engineers to select the best operation mode for any given measurement task. It is the only solution available on the market that integrates all four modes in a single device, said TDK when it was introduced in October. Start of production is planned for second quarter 2020. 

Measurement data is delivered via a high-speed SPI interface. Combined with the 3D capability, this makes the sensor particularly suitable for applications like gear shifters or steering column switches. Its magnetic field amplitude ranges from 10 mT to 130 mT, and down to 5 mT with reduced accuracy.

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