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5.5
Usage of Infineon's Temperature Calibration Tool
For laboratory calibration purpose, Infineon provides a simple tool to determine the calibration parameters from
measurement data (see
The following sequence of steps is used for the temperature calibration the Infineon tool:
1. Measure the sensor's AOUT and TCAL registers at a fixed magnet position for different temperatures as
described in
Chapter
Figure
5-4, upper left side). For the readout of this data, the Infineon TLE4997 Evaluation Kit can be used.
2. The tool automatically calculates the corresponding Sensitivity correction values S from the entered T
AOUT values according to
3. Based on the calculated S values, the tool performs a quadratic fit and calculates the Application Sensitivity
Polynomial parameters TC1 and TC2 (see
User Parameter Calculation
i
T
[°C]
(i)
J
1
-40
2
-20
3
0
4
25
5
50
6
75
7
100
8
120
T
(i)
[°C] and VOUT
J
Figure 5-4 Infineon tool for temperature calibration, application sensitivity polynomial fit.
4. Readout the sensor's preprogrammed TL
marked in yellow (see
Kit can be used.
5. The tool calculates the TL
value and the TC1 and TC2 coefficients determined in steps 1-3. For that, an automated script is used that
implements the procedure explained in
corresponding table fields marked in green (see
6. Program the calculated TL
or a suitable programmer tool.
For illustration purpose, the tool also displays graphs for the preprogrammed and final sensitivity polynomials,
S
and S
, the application sensitivity polynomial S
DSP,pre
DSP,final
succesful calibration, S
User's Manual
Figure
5-4).
5.3, enter the T
(in °C) and AOUT (in V) values in the table fields marked in yellow (see
J
Equation
(5.7).
(i)
(i)
VOUT
[V]
S
4,45000
1,282
4,43500
1,292
4,41000
1,309
4,39000
1,323
4,36500
1,340
4,32500
1,370
4,30000
1,389
4,26500
1,416
(i)
shall be read from the sensor for each data point (T
1,44
1,42
y = 2,135E-06x
1,40
1,38
1,36
1,34
1,32
1,30
1,28
1,26
-50
0
pre
Figure 5-5
upper left side). For the readout of this data, the Infineon TLE4997 Evaluation
and TQ
parameters out of the entered TL
final
final
Chapter
and TQ
values into the TLE4997 using the Infineon TLE4997 Evaluation Kit
final
final
should by approximately equal S
DSP,final
Calibration of TLE4997 Temperature Compensation
Figure
5-4, upper right side).
y = a + bx + cx
a =
b =
c =
S
= 1 + TC1
user
T0
=
user
TC1
user
TC2
user
= TCAL/16 + 48)
J
2
+ 6,550E-04x + 1,305E+00
50
T
(°C)
J
and TQ
values and enter them in the corresponding table fields
pre
5.4. The calculated values TL
Figure 5-5
upper right side)
and the product S
app
*S
DSP,pre
32
2
1,31E+00
6,55E-04[°C
-1
]
2,14E-06[°C
-2
]
(T-T0
) + TC2
(T-T0
user
user
user
user
48[°C]
=
641[ppm/°C]
=
1,59[ppm/°C
S(i)
Quadratic fit
100
150
and TQ
values, the (fixed) TT
pre
pre
and TQ
final
final
*S
DSP,pre
(compare
Equation
app
TLE4997
User's Manual
and
J
)
2
2
]
appear in the
. Ideally, after
app
(5.6)).
v01_01, 2019-08
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