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AS5304 Datasheet(PDF) 7 Page - ams AG

Part No. AS5304
Description  Integrated Hall ICs for Linear and Off-Axis Rotary Motion Detection
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Maker  AMSCO [ams AG]
Homepage  http://www.ams.com
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AS5304 Datasheet(HTML) 7 Page - ams AG

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AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection
Revision 1.5
www.austriamicrosystems.com
Page 7 of 13
AS5306 Systematic Linearity Error caused by Pole
Length Deviation
0
20
40
60
80
100
120
140
900
1000
1100
1200
1300
1400
1500
Pole Length [μm]
Error [µm]
AS5304 Systematic Linearity Error caused by Pole
Length Deviation
0
20
40
60
80
100
120
140
1500
1700
1900
2100
2300
2500
Pole Length [μm]
Error [µm]
3.
It is therefore recommended to continue to the next (second) index position from the end of the strip (Index = high,
A=B= high). This position can now be used as a defined home position.
7.2
Incremental Hysteresis
If the magnet is sitting right at the transition point between two steps, the
noise in the system may cause the incremental outputs to jitter back and
forth between these two steps, especially when the magnetic field is
weak.
To avoid this unwanted jitter, a hysteresis has been implemented. The
hysteresis lies between 1 and 2 LSB, depending on device scattering.
Figure 8 shows an example of 1LSB hysteresis: the horizontal axis is the
lateral position of the magnet as it scans across the IC, the vertical axis
is the change of the incremental outputs, as they step forward (blue line)
with movement in +X direction and backward (red line) in –X direction.
Note: 1LSB = 25µm for AS5304, 15µm for AS5306
Figure 8:
Hysteresis of the incremental output
7.3
Integral Non-Linearity (INL)
The INL (integral non-linearity) is the deviation between indicated position and actual position. It is better than 1LSB for both
AS5304 and AS5306, assuming an ideal magnet. Pole length variations and imperfections of the magnet material, which lead to
a non-sinusoidal magnetic field will attribute to additional linearity errors.
7.3.1
Error Caused by Pole Length Variations
Figure 9 and Figure 10 show the error caused by a non-ideal
pole length of the multi-pole strip or ring.
This is less of an issue with strip magnets, as they can be
manufactured exactly to specification using the proper
magnetization tooling.
Figure 9:
Additional error caused by pole length variation: AS5304
However, when using a ring magnet (see Figure 1) the pole
length differs depending on the measurement radius. For
optimum performance it is therefore essential to mount the
IC such that the Hall sensors are exactly underneath the
magnet at the radius where the pole length is 2.0mm
(AS5304) or 1.2mm (AS5306), see also 8.1.2.
Note that this is an additional error, which must be added to
the intrinsic errors INL (see 7.3) and DNL (see 7.4).
Figure 10:
Additional error caused by pole length variation: AS5306
M agnet position
Hys teres is:
1 LSB
X +2
Increm en tal
o utput
Mov ement d ir ection: +X
M ovem ent direc tion: -X
X +4
X
X
X +1
X +3
X+1
X+2
X+ 3
X+4


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