AS5043_09 datasheet(21/37 Pages) AMSCO

tên linh kiện	AS5043

Giải thích chi tiết về linh kiện	Programmable 360 Magnetic Angle Encoder with Absolute SSI and Analog Outputs

PDF	37 Pages

Scroll/Zoom	100%

nhà sản xuất	AMSCO [ams AG]

Trang chủ	http://www.ams.com

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21 / 37 page

AS5043

Data Sheet – Choosing the Proper Magnet

www.austriamicrosystems.com

Revision 1.80

20 – 36

15 Choosing the Proper Magnet

Typically the magnet should be 6mm in diameter and ≥2.5mm in height. Magnetic materials such as rare earth AlNiCo,

SmCo5 or NdFeB are recommended.

The magnet’s field strength perpendicular to the die surface should be verified using a gauss-meter. The magnetic field

Bv at a given distance, along a concentric circle with a radius of 1.1mm (R1), should be in the range of ±45mT…±75mT.

(see Figure 18).

Figure 18: Typical Magnet and Magnetic Field Distribution

Magnet axis

Vertical field

component

(45…75mT)

360

Vertical field

component

R1 concentric circle;

radius 1.1mm

Magnet axis

typ. 6mm diameter

15.1 Physical Placement of the Magnet

The best linearity can be achieved by placing the center of the magnet exactly over the defined center of the IC package

as shown in Figure 19.

Figure 19: Defined IC Center and Magnet Displacement Radius

Defined

center

2.433 mm

3.9 mm

Area of recommended maximum

magnet misalignment

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