TLE5010 Datasheet, PDF (19/56 Pages) Infineon Technologies AG – GMR Based Angular Sensor

TLE5010
Draft
Electrical and Magnetic Parameters
Orthogonality Definition
The corresponding maximum and zero crossing points of the SIN and COS signals are
not exactly in a distance of 90°. The difference between X and Y phase is called
’Orthogonality Error’.
ϕ = ϕ_X – ϕ_Y
jideal = 0°
jX : Phase error of X (= cos) Signal
jY : Phase error of Y (= sin) Signal
5.4
Calibration
GMR Values
The end-of-line calibration can be done using following sequence.
The conditions are specified in Table 9.
• Turn magnetic field left and measure X and Y values
• Calculation of Amplitude, Offset, Phase correction values of left turn
• Turn further 90° left and 90° back right without measurement
• Turn magnetic field right and measure X and Y values
• Calculation of Amplitude, Offset, Phase correction values of right turn
• Calculation of mean values of Amplitude, Offset, Phase correction values
The above gained values have to be stored in a non-volatile memory. They are used for
the correction of the read-out X and Y values before the angular calculation.
The resulting angular deviation is calculated using above determined parameters.
Temperature Measurement
The signal amplitude T₂₅ of the temperature measurement path at calibration conditions
has to be measured and stored.
Calibration Conditions
All errors are related to a calibration done using following conditions:
Table 9
GMR calibration conditions
Parameter
Symbol Limit Values
Unit Notes
min. typ. max.
Flux density
Temperature
B_CAL -
T_CAL
-
30
-
25
-
mT B_Z = 0 mT
°C
Preliminary Data Sheet
19
V 0.9, 2007-05