TLE4998P3C Datasheet, PDF (18/32 Pages) Infineon Technologies AG – Programmable Linear Hall Sensor

TLE4998P3C
Signal Processing
6.2
Gain Setting
The sensitivity is defined by the range and the gain setting. The output of the A/D
converter is multiplied by the Gain value.
Table 8
Gain
Parameter
Symbol Limit Values Unit
min. max.
Register size
G
15
bit
Gain range
Gain - 4.0 3.9998 -
Gain quantization steps ∆Gain
244.14
ppm
Notes
Unsigned integer value
1)2)
Corresponds to 1 / 4096
1) _{For Gain values between - 0.5 and + 0.5, the numerical accuracy decreases. To obtain a flatter output curve,}
a higher range setting should be selected
2) _{A Gain value of +1.0 corresponds to typical 0.8%/mT sensitivity (100 mT range, not guaranteed). It is crucial}
to do a final calibration of each IC within the application using the Gain/DY_OS value
The Gain value can be calculated by
:
Gain = ⁽---G------–----1---6---3---8---4----⁾
4096
6.3
Offset Setting
The offset value corresponds to an output value with zero field at the sensor.
Table 9
Offset
Parameter
Symbol Limit Values Unit Notes
min. max.
Register size
OS
15
bit Unsigned integer value
Offset range
DY_OS -400 399
%
Virtual DY_PWM ¹⁾
Offset quantization steps ∆DY_OS
0.024
% 100% / 4096
1) _{Infineon pre-calibrates the samples at zero field to 50% duty cycle (100 mT range), but does not guarantee}
the value. Therefore it is crucial to do a final calibration of each IC within the application
The offset value can be calculated by:
DY_OS
=
(_{---O-----S----–-----1---6---3---8---4----})
4096
×
100
Data Sheet
18
Rev 1.1, 2009-09