TLE5012 Datasheet, PDF (21/57 Pages) Infineon Technologies AG – GMR-Based Angular Sensor for Rotor Position Sensing

TLE5012
Specification
3.4.4 Angle Performance
After internal calculation the sensor has a remaining error, as shown in Table 7. The error value refers to B_Z = 0mT
and the operating conditions given in Table 3 “Operating Range” on Page 17.
The overall angle error represents the relative angle error. This error describes the deviation to the reference line
after zero angle definition.
Table 7 Angle Performance
Parameter
Symbol
Values
Unit Note / Test Condition
Min. Typ. Max.
Overall Angle Error (with auto- α_Err
calibration)
-
0.6¹⁾ 1.0
°
including lifetime and
temperature drift²⁾³⁾
Overall Angle Error (without auto- α_Err
calibration)
-
0.6¹⁾ 1.6
°
including temperature
drift²⁾³⁾
1) At 25°C, B =30 mT
2) Including hysteresis error, caused by revolution direction change.
3) Only with calibrated GMR-compensation parameters of customer setup; Relative error after zero angle definition.
Autocalibration
The autocalibration enables online parameter calculation and reduces therefore the angle error due to
misalignments.
After start-up the parameters out of the fuses get loaded into flip-flops. The TLE5012 updates these parameters
after a full revolution. The update can be chosen within the Autocalibration Mode (AUTOCAL) bit. It is possible to
do the update after every 22.5°, 11.25° or after t_upd.
3.4.5 Signal Processing
The signal path of the TLE5012 is depicted in Figure 11. It consists of the GMR-bridge, ADC, filter and angle
calculation. Depending on the filter configuration a different total delay time is achieved. Additional to this delay
time, the delay time of the interface has to be considered. The delay time leads to an additional angle error at
higher speeds. With enabling the prediction, the signal delay time will be reduced (Figure 12).
X
GMR
Y
GMR
SD-
ADC
SD-
ADC
Filter
Filter
t_del
TLE5012
t_upd
Microcontroller
Angle
Calculation
IF
t_delIF
Figure 11 TLE5012 Signal path
At FIR_MD = 0 only raw values can be read out, due to the more time consuming angle calculation.
Target Data Sheet
21
V 0.46, 2009-09