3D Hall position sensor offers interference suppression and SPI interface

October 09, 2019 //By Christoph Hammerschmidt
3D Hall position sensor offers interference suppression and SPI interface
TDK expands its Micronas product portfolio with a new position sensor of the masterHAL sensor family HAL 39xy. The new family member HAL 3900 offers simultaneous magnetic field measurement in all three dimensions as well as robust 2D position detection with interference suppression. Application examples are position detection in the gearbox and gear shift or steering angle measurement.

The heart of the HAL 39xy sensors is based on TDK Micronas' 3D HAL pixel cell technology. This enables accurate magnetic field measurement and the detection of all three magnetic field components at a single point. By measuring the components B X, B Y and B Z, the sensor can determine the direction of the magnetic field. At the same time, a highly flexible sensor array consisting of a series of Hall elements enables 2D measurement with interference suppression. The HAL 3900 sensor allows designers to select the optimal operating mode for any measurement task. The HAL 3900 sensors are the only system solutions available on the market that integrate all four modes into a single sensor.

The measurement data is made available via an SPI interface. The sensors meet current and future requirements of the automotive and industrial markets and offer four different measurement modes in a single component: Linear position detection, 360° rotation angle detection and 180° rotation angle detection with interference field compensation including gradient fields, as well as the ability to fully measure 3D magnetic fields (BX, BY, BZ).

The combination of SPI interface and 3D capability makes the HAL 3900 a solution for various sensor applications in vehicles. Examples are gearshift or steering column switches. The interference field concept makes the sensor suitable for applications requiring measurement at the end of a shaft. With an interference field of 4,000 A/m, the angular error can be reduced to less than 0.3°. The HAL 3900 also has a sleep mode that allows customers to reduce the average power consumption, which is becoming increasingly important for electric cars. The sensor was developed as ASIL B ready SEooC (Safety Element out of Context) according to ISO 26262.

Samples are available now; production is scheduled to start in the second quarter of 2020.


More information: https://www.tdk.com/corp/en/worldwide/index.htm

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