TLE5009-E2000 Datasheet, PDF (23/32 Pages) Infineon Technologies AG – GMR-Based Angular Sensor

TLE5009
Specification
Now the amplitude and phase can be calculated (Equation (19), Equation (20))
(19)
A_X = (DFT _ X _ r)² + (DFT _ X _ i)²
A_Y = (DFT _ Y _ r)² + (DFT _ Y _ i)²
ϕ_X
= arctan
DFT _ X
DFT _ X
_i
_r
(20)
ϕ_Y
=
π
2
− arctan
DFT _ Y _ i
DFT _ Y _ r
ϕ = ϕ_X −ϕ_Y
3.4.4.2 Final Parameters
No matter what calibration method is used, you still have to calculate the symmetrical values of the parameters.
This is done using the mean value of the clock-wise (cw) rotation parameters and counterclock-wise (ccw) rotation
parameters. This calculation has to be done with X and Y parameters. These parameters have to be used for the
signal correction.
A_M
=
A_cw
+ A_ccw
2
O_M
= ^Ocw
+ O_ccw
2
(21)
ϕ_M
=
ϕ_cw
+ ϕ_ccw
2
(A,O,ϕ)_M .. Mean parameters
(A,O,ϕ)_CW .. Parameters of clock-wise rotation
(A,O,ϕ)_CCW .. Parameters of counterclock-wise rotation
Data Sheet
23
Rev. 1.1, 2012-04