New TDK Sensor Exhibits Real 3D Measurement

DK Corporation has introduced HAL 3900 as a new member of the masterHAL® sensor family HAL® 39xy, thus expanding its Micronas position sensor portfolio. The new HAL 3900 features real 3D magnetic-field measurement capability and 2D stray-field robust position detection. Measurement data is delivered via a high-speed Serial Peripheral interface (SPI). The sensors meet present and future needs of automotive and industrial markets, and offer 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 the capability for real 3D magnetic field measurement (BX, BY, BZ).

HAL 3900 sensor from the HAL®39xy masterHAL® family
HAL 3900 sensor from the HAL®39xy masterHAL® family
Embeds Four Sensor Modes
The heart of the HAL 3900 sensor is the patented 3D HAL® pixel cell tech-nology. It not only helps to measure magnetic fields very accurately, but also enables the measurement of all three magnetic-field components at one sin-gle spot. By measuring the BX, BY, and BZ components, the sensor is able to de-tect the direction of the magnetic field. At the same time, the unique concept of an array of Hall plates offers a 2D strayfield compensation. The highly flexible sensor array of the HAL 3900 sensor helps design engineers to select the best operation mode for any given measure-ment task. HAL 3900 is the only solu-tion available on the market that inte-grates all four modes in a single device.

The combination of SPI and 3D capability makes the HAL 3900 a perfect solution for applications, like gear shifters or steering column switches. The unique stray-field concept makes the sensor fit for applications requiring a stray-field robust off-axis measurement. The angular error due to stray fields can be reduced to less than 0.3° in the presence of a stray field of 4000A/m. HAL 3900 also features a sleep mode, helping customers reduce the average current consumption, which is increasingly important for electric cars. The device is developed as an ASIL B-ready Safety Element out of Context (SEooC) according to ISO 26262.