TLE5009-E2000 Datasheet, PDF (19/32 Pages) Infineon Technologies AG – GMR-Based Angular Sensor

TLE5009
Specification
3.4.4 Calibration of TLE5009
This chapter explains how to determine the Giant MagnetoResistance (GMR) parameters such as amplitude,
offset, and the phase of X- and Y-channels. Extraction of these parameters is essential to achieve the angle
accuracy given in Table 8 “Angle performance in differential applications” on Page 25.
The end-of-line calibration is accomplished using the following sequence (Figure 9):
1.) left turn measurement
3.) right & left turn w/o measurement
4.) right turn measurement
90°
180°
0°
Start
End
270°
Figure 9 Calibration routine
1. Turn magnetic field 360° left and measure X and Y values
2. Calculate amplitude, offset, phase correction values of left turn
3. Turn further 90° left and 90° back right without measurement
4. Turn magnetic field 360° right and measure X and Y values
5. Calculate amplitude, offset, phase correction values of right turn
6. Calculate mean values of amplitude, offset, phase correction
The calibration has to be done at room temperature with a magnet in the specified magnetic field range.
3.4.4.1 Extraction of Parameters
There are two possible methods for extracting these parameters. The methods will be discussed in more detail in
the next two sections.
3.4.4.1.1 Min-Max Method
X_max, X_min, Y_max and Y_min have to be extracted out of every full-turn measurement (Figure 10).
Data Sheet
19
Rev. 1.1, 2012-04