Infineon Technologies TLE5012B - Specification; Autocalibration

TLE5012B
Specification
User’s Manual 22 Rev. 1.2, 2018-02
4 Specification
4.1 Autocalibration
Autocalibration enables online parameter calculation, and therefore reduces angle error due to temperature and
lifetime drifts.
The TLE5012B is a pre-calibrated sensor; at start-up the parameters stored in the laser fuses are loaded into flip-
flops. During operation, the TLE5012B needs 1.5 revolutions to generate new autocalibration parameters. The
parameters are updated with new autocalibration parameters according to the mode selected via the AUTOCAL
bits (Mode 2 register). The parameters are updated in a smooth way to avoid an angle jump on the output; only
one Least-Significant Bit (LSB) will be changed within the chosen range or time. Once the parameters are updated,
a new autocalibration parameter generation starts, as autocalibration is done continuously.
AUTOCAL Modes:
• 00: No autocalibration
• 01: Autocalibration Mode 1. Parameters are updated by one LSB at every update time t
upd
(dependent on
FIR_MD setting) till the new autocalibration parameter values are reached.
• 10: Autocalibration Mode 2. Parameters are updated by one LSB only. After the update, autocalibration will
already calculate new parameters again.
• 11: Autocalibration Mode 3. Parameters are updated by one LSB at every angle range of 11.25° till the new
autocalibration parameter values are reached.
Figure 4-1 Parameter correction with autocalibration mode 1
Figure 4-2 Parameter correction with autocalibration mode 2
Fused Offsets:
X_Offset: -633
Y_Offset: -653
Acquire
Max-Min
pairs
Calculate:
Offsets, Synch
X_Offset: -646
Y_Offset: -658
Acquire
Max-Min
pairs
Calculate:
Offsets, Synch
X_Offset: -651
Y_Offset: -664
Tempe-
rature
Check
Tempe-
rature
Check
Parameters
Correction
Parameters
Correction
-633
-646
-651
-653
-658
-664
-670
-665
-660
-655
-650
-645
-640
-635
-630
-625
-620
Offset
Filter update period (t
upd
)
X_Offset Y_Offset
Parameters Correction
Acquire Max-
Min pairs
Parameters
Correction
Acquire Max-Min pairs
-633
-634
-635
-653
-654
-655
-660
-655
-650
-645
-640
-635
-630
-625
-620
01234
Revolutions
X_Offset Y_Offset
Parameters
Correction
Acquire Max-Min
pairs
Parameters
Correction
Acquire Max-Min pairs
Fused Offsets:
X_Offset: -633
Y_Offset: -653
Acquire
Max-Min
pairs
Calculate:
Offsets, Synch
X_Offset: -646
Y_Offset: -658
Acquire
Max-Min
pairs
Calculate:
Offsets, Synch
X_Offset: -651
Y_Offset: -664
Tempe-
rature
Check
Tempe-
rature
Check
Parameters
Correction
by only 1
LSB
Parameters
Correction
Offset