TDK-Micronas introduces 3D Hall effect position sensor

Not long ago, TDK-MIcroNAS introduced a 3D Hall effect position sensor with stray magnetic field compensation.

Figure 1: New Micronas HAL® 39xy Hall-effect position sensor series with multiple measurement modes with active stray magnetic field compensation

Application field

Q: What is the application area of this new product?

A: The main driving factor is the electrification trend of cars. There are more and more motors and high-current cables in cars that generate stray magnetic fields.

Therefore, it can be said that all applications require more or less stray field immunity, and the specific requirements depend on factors such as accuracy requirements, position in the vehicle, and natural shielding effect.

Q: In which industries are the target customers in China mainly concentrated?

A: TDK's linear Hall effect product line has a strong market position in China. Our goal is to replicate the success of 3D Hall-effect devices in all market segments in China.

2. How to achieve stray magnetic field compensation?

Q: The history of Hall sensors is very long. What innovations can we have?

A: We are still improving the performance (sensitivity, noise, power consumption) and function (3D acquisition, stress immunity) of Hall components. The main innovation of the HAL® 39xy series is the stray field immunity. (Reducing the influence of the external disturbance magnetic field on the measured position/angle related magnetic field).

The principle is to use multiple Hall elements, through intelligent algorithms for information fusion and detection of interference sources, thereby outputting data that is not interfered by external magnetic fields.

All of this depends on the direct integration of Hall elements into CMOS technology, which makes it easy to integrate multiple Hall elements onto a single silicon chip. This is a unique advantage of this technology.

Q: What is the unique advantage of this new product?

A: Very flexible and able to handle many different application scenarios and configurations.

We currently have 10 Hall elements integrated on a single silicon wafer. Depending on the magnet used and the motion to be measured (linear stroke, angle, on-axis, off-axis), DsP will use different combinations of Hall elements to integrate information and detect interference sources through intelligent algorithms, so that the output is not subject to external magnetic fields. Interfering data.

Q: What unique technologies are used in the new products? In addition, stray magnetic fields can affect most position sensors based on Hall effect technology, so will other technologies (such as TMR) be considered?

A: The main innovation of the HAL39 series displayed in this exhibition is the stray field immunity (reducing the influence of external interference magnetic field on the measured position/angle related magnetic field).

The principle is to use multiple Hall elements, through intelligent algorithms for information fusion and detection of interference sources, thereby outputting data that is not interfered by external magnetic fields. We use a patented IP. Product specifications show that the residual interference in the stray field is only < 0.1°.

All of this depends on the direct integration of Hall elements into CMOS technology, which makes it easy to integrate multiple Hall elements onto a single silicon chip. This is a unique advantage of this technology.

TDK is currently working to achieve a TMR (tunnel magnetoresistive) solution that is immune to stray interference.