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[v1-07] 2016-Sep-09

AS5601 − Application Information

Magnet Requirements

The AS5601 requires a minimum magnetic field component Bz

perpendicular to the sensitive area on the chip. The center of

the sensitive area is in the center of the package.

Along the circumference of the Hall element circle the magnetic

field Bz should be sine-shaped. The magnetic field gradient of

Bz along the radius of the circle should be in the linear range

of the magnet to eliminate displacement error by the

differential measurement principle.

Figure 36:

Magnetic Field Bz and Typical Airgap

The typical airgap is between 0.5 mm and 3 mm, and it depends

on the selected magnet. A larger and stronger magnet allows a

larger airgap. Using the AGC value as a guide, the optimal airgap

can be found by adjusting the distance between the magnet

and the AS5601 so that the AGC value is in the center of its

range. The maximum allowed displacement of the rotational

axis of the reference magnet from the center of the package is

0.25 mm when using a magnet with a diameter of 6mm.

AS5601 Folha de dados(PDF) 34 Page - ams AG