AS5035-T Просмотр технического описания (PDF) - austriamicrosystems AG
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AS5035-T Datasheet PDF : 18 Pages
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AS5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER
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 10).
N
S
Die surface
Package surface
z
0.576mm ± 0.1mm
1.282mm ± 0.15mm
9.1 Physical Placement of the Magnet
The best linearity can be achieved by placing the center
lid of the magnet exactly over the defined center of the IC
package as shown in Figure 11:
3.9 mm
a 1
3.9 mm
ill v 2.433 mm
AG t st 2.433mm
Defined
center
Rd
Area of recommended maximum
magnet misalignment
ms ten Figure 11: Defined IC center and magnet displacement radius
a n Magnet Placement:
o The magnet’s center axis should be aligned within a
displacement radius Rd of 0.25mm from the defined
c center of the IC with reference to the edge of pin #1 (see
l Figure 11). This radius includes the placement tolerance
of the chip within the SSOP-16 package (+/- 0.235mm).
a The displacement radius Rd is 0.485mm with reference to
the center of the chip
ic The vertical distance should be chosen such that the
magnetic field on the die surface is within the specified
n limits (see Figure 10). The typical distance “z” between
the magnet and the package surface is 0.5mm to 1.8mm
h with the recommended magnet (6mm x 3mm). Larger
gaps are possible, as long as the required magnetic field
c strength stays within the defined limits.
e A magnetic field outside the specified range may still
Tproduce usable results, but the out-of-range condition
Figure 12: Vertical placement of the magnet
10 Angular Output Tolerances
10.1 Accuracy
Accuracy is defined as the error between measured
angle and actual angle. It is influenced by several
factors:
the non-linearity of the analog-digital converters,
internal gain and mismatch errors,
non-linearity due to misalignment of the magnet
As a sum of all these errors, the accuracy with centered
magnet = (Errmax – Errmin)/2 is specified as better than
±0.5 degrees @ 25°C (see Figure 14).
Misalignment of the magnet further reduces the
accuracy. Figure 14 shows an example of a 3D-graph
displaying non-linearity over XY-misalignment. The
center of the square XY-area corresponds to a centered
magnet (see dot in the center of the graph). The X- and
Y- axis extends to a misalignment of ±1mm in both
directions. The total misalignment area of the graph
covers a square of 2x2 mm (79x79mil) with a step size of
100µm.
6
5
4
°3
2
1
0
800
500
200
-100 x
will be indicated by MagINCn (pin 1) and MagDECn (pin
-400
2), see 5.5.
-700
y
-1000
Figure 13: Example of linearity error over XY misalignment
Revision 1.5
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