TLE5009-E2000 Datasheet, PDF (21/32 Pages) Infineon Technologies AG – GMR-Based Angular Sensor

TLE5009
Specification
Figure 11 Orthogonality error
There is another more accurate way to determine the orthogonality error. The orthogonality can be calculated out
of the magnitude of two 90° angle shifted components. Possible angle combinations are 45° and 135°, 135° and
225°, 225° and 315° or 315° and 45°.
The angle value is given by the angle sensor. No reference is necessary. Therefore the final parameters of
amplitude and offset (Chapter 3.4.4.2) should be used.
At an angle output of 45° the corresponding Y(sin) and X(cos) values can be read out. This has been done also
at 135° (Figure 12).
Next step is to calculate the length of the magnitudes (Equation (14)):
M ₄₅ = X ₄₅₂ + Y₄₅₂
(14)
M₁₃₅ =
X2
135
+ Y₁₃₅₂
M₄₅, M₁₃₅.. Magnitude at 45° and 135°
X₄₅, X₁₃₅ .. Cosine values at 45° and 135°
Y₄₅, Y₁₃₅ .. Sine values at 45° and 135°
With these magnitudes the orthogonality can be calculated (Equation (15)):
ϕ = 2 * arctan( ^{M135 − M 45} )
M₁₃₅ + M ₄₅
(15)
Data Sheet
21
Rev. 1.1, 2012-04