tle4997i Infineon Technologies Corporation, tle4997i Datasheet - Page 25

• Manufacturer Part Number: tle4997i
• Description: Programmable Linear Hall Sensor For Industrial Use
• Manufacturer: Infineon Technologies Corporation

8
The magnetic field strength of a magnet depends on the temperature. This material
constant is specific for the different magnet types. Therefore the TLE4997I offers a
second order temperature compensation polynomial, by which the Hall signal output is
multiplied in the DSP.
There are three parameters for the compensation:
Following formula describes the sensitivity dependent on the temperature in relation to
the sensitivity at the reference temperature
For more information see also the signal processing flow in
The full temperature compensation of the complete system is done in three steps:
1. Pre calibration in the Infineon final test.
2. Overall System calibration.
Table 16
Parameter
Register size
1
Quantization steps of
Register size
2
Quantization steps of
Register size
Reference temperature
Quantization steps of
Preliminary Data Sheet
• Reference temperature
st
nd
The parameters TC1, TC2, T0 are set to a maximally flat temperature characteristics
regarding the Hall probe and internal analog processing parts in the 100mT range.
The typical coefficients TC1, TC2, T0 of the magnetic circuitry are programmed.
This can be done deterministic, as the algorithm of the DSP works fully reproducible.
The final setting of the TC1, TC2, T0 values are relatively to the given pre calibrated
values.
T
order coefficient
order coefficient
0
Temperature Compensation
TC
TC
T
Temperature Compensation
0
1
2
TC
S
TC
TC
TC
TC
T
1
0
2
T ( )
1
2
• A linear part (1
=
Symbol Limit Values
TL
TC
∆ TC
TQ
TC
∆ TC
TR
T
∆ T
0
1
TC
0
1
2
+
1
2
1
TC
1
min.
-
-1000
-
- 4
-
- 48
×
(
T T
25
T
–
0
15.26
0.119
st
:
16
0
max.
9
2500
8
4
3
64
order)
)
+
TC
2
×
Temperature Compensation
• A quadratic part (2
(
Unit
bit
ppm/ °C
ppm/ °C
bit
ppm/ °C²
ppm/ °C²
bit
°C
°C
T T
TC
Figure
–
2
0
)
2
5.
Notes
unsig. int. values
unsig. int. values
unsig. int. values
V 1.01, 2006-09
TLE4997I
nd
order)