TLE5012_10 Datasheet, PDF (23/64 Pages) Infineon Technologies AG – GMR-Based Angular Sensor for Rotor-Position Sensing

TLE5012
Specifications
3.4.4 Angle Performance
After internal calculation the sensor has a remaining error, as shown in Table 11. The error value refers to B_Z =
0mT and the operating conditions given in Table 3 “Operating range” on Page 18.
The overall angle error represents the relative angle error. This error describes the deviation from the reference
line after zero angle definition.
Table 9 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⁾⁴⁾
Overall Angle Error (without auto- α_Err
calibration)
-
0.6¹⁾ 1.6
°
including temperature
drift²⁾³⁾⁵⁾
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.
4) Not subject to production test - verified by design/characterization
5) 0 h
Autocalibration
The autocalibration enables online parameter calculation and therefore reduces the angle error due to
temperature drift, lifetime drift, and misalignments.
The TLE5012 is a pre-calibrated sensor. After start-up, the parameters out of the laser fuses get loaded into flip-
flops. The TLE5012 needs more than a full revolution to generate new parameters. The update mode can be
chosen within the Interface Mode 2 register (AUTOCAL). The parameters are updated in a smooth way to avoid
an angle jump on the output. Therefore only one LSB will be changed within the choosen range or time. The
autocalibration is done continuously.
AUTOCAL Modes:
• 00: No autocalibration
• 01: Autocalibration Mode 1. Only one LSB to final values within the update time t_upd (depending on FIR_MD
setting).
• 10: Autocalibration Mode 2. Only one LSB update over one full revolution. After update of one LSB, the
autocalibration will calculate the parameters again.
• 11: Autocalibration Mode 3. Only one LSB to final values within an angle range of 11.25°.
3.4.5 Signal Processing
The signal path of the TLE5012 is depicted in Figure 12. It consists of the GMR bridge, ADC, filter, and angle
calculation. Depending on the filter configuration, various total delay times are achieved. In addition 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. By enabling the prediction, the signal delay time can be reduced (Figure 13). The prediction uses
the difference between current and last angle value and calculates the output value by adding this difference to
the current value. A linear prediction is thereby achieved.
α (t + 1) = 2 ⋅α (t) − α (t −1)
(3)
Final Data Sheet
23
V 1.0, 2010-11