AS5304 datasheet(13/31 Pages) AMSCO

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ams Datasheet

Page 13

[v2-00] 2017-May-03

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AS5304/AS5306 − Detailed Description

Magnetic Field Warning Indicator

The AS5304 can also provide a low magnetic field warning to

indicate a missing magnet or when the end of the magnetic

strip has been reached. This condition is indicated by using a

combination of A, B and Index, that does not occur in normal

operation:

A low magnetic field is indicated with:

Index = high

A=B=low

Vertical Distance between Magnet and IC

The recommended vertical distance between magnet and IC

depends on the strength of the magnet and the length of the

magnetic pole.

Typically, the vertical distance between magnet and chip

surface should not exceed ½ of the pole length. That means for

AS5304, having a pole length of 2.0mm, the maximum vertical

gap should be 1.0mm. For the AS5306, having a pole length of

1.2mm, the maximum vertical gap should be 0.6mm. These

figures refer to the chip surface. Given a typical distance of

0.2mm between chip surface and IC package surface, the

recommended vertical distances between magnet and IC

surface are therefore:

AS 5304: ≤ 0.8mm

AS 5306: ≤ 0.4mm

AS5304 데이터시트(PDF) 13 Page - ams AG