TLI5012BE1000_15 Datasheet, PDF (21/37 Pages) Infineon Technologies AG – GMR-Based Angle Sensor

TLI5012B E1000
Specification
4.3.4 Angle Performance
After internal calculation, the sensor has a remaining error, as shown in Table 4-9. The error value refers to B_Z=
0mT and the operating conditions given in Table 4-2 “Operating range and parameters” on Page 16.
The overall angle error represents the relative angle error. This error describes the deviation from the reference
line after zero-angle definition. It is valid for a static magnetic field. If the magnetic field is rotating during the
measurement, an additional propagation error is caused by the angle delay time (see Table 4-10 “Signal
processing” on Page 23), which the sensor needs to calculate the angle from the raw sine and cosine values
from the MR bridges. In fast-turning applications, prediction can be enabled to reduce this propagation error.
Table 4-9 Angle performance
Parameter
Symbol
Values
Unit Note / Test Condition
Min. Typ. Max.
Overall angle error at 25°C
α_Err
1.0 °
Overall angle error -40°C...125°C α_Err
1.9 °
1) Including hysteresis error, caused by revolution direction change
Including lifetime drift¹⁾²⁾³⁾.
Including temperature & lifetime drift^1)2)3)4)
2) Relative error after zero angle definition
3) With autocalibration (pre-configured by default). No temperature changes >5 Kelvin within 1.5 revolutions considered.
4) Not subject to production test - verified by design/characterization
Autocalibration enables online parameter calculation and therefore reduces the angle error due to temperature
and lifetime drifts. The TLI5012B E1000 needs 1.5 revolutions to generate new autocalibration parameters. These
parameters are continuously updated. The parameters are updated in a smooth way (one Least-Significant Bit
within the chosen range or time) to avoid an angle jump on the output.
If the temperature changes by more than 5 Kelvin during 1.5 revolutions an additional error has to be added to the
specified angle error in Table 4-9. This error depends on the temperature change (Delta Temperature) as well as
from the initial temperature (Tstart) as shown in Figure 4-3. Once the temperature stabilizes and the application
completes 1.5 revolutions, then the angle error is as specified in Table 4-9.
For negative Delta Temperature changes (from higher to lower temperatures) the additional angle error will be
smaller than the corresponding positive Delta Temperature changes (from lower to higher temperatures) shown
in Figure 4-3. The Figure 4-3 applies to the worst case.
2.5
2
1.5
1
0.5
0
0
Tstart -40°C
Tstart -20°C
Tstart 25°C
Tstart 85°C
Tstart 105°C
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Delta Temperature (Kelvin) within 1.5 revolutions
Figure 4-3 Additional angle error for temperature changes above 5 Kelvin within 1.5 revolutions
Data Sheet
21
Rev. 1.1, 2015-09