TLE4997_08 Datasheet, PDF (19/34 Pages) Infineon Technologies AG – Programmable Linear Hall Sensor

TLE4997
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 with 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 numeric accuracy decreases.}
To obtain a flatter output curve, it is recommended to select a higher range setting.
2) _{A gain value of +1.0 corresponds to a typical 40 mV/mT sensitivity (100 mT range, not guaranteed). Infineon}
pre-calibrates the samples to 60mV/mT (100mT range) in the final test, but does not guarantee the accuracy
of this calibration. It is crucial to do a final calibration of each IC within the application using the Gain/V_OS value.
The gain value can be calculated by
:
Gain = ⁽---G------–----1---6---3---8---4----⁾
4096
6.3
Offset Setting
The offset voltage corresponds to an output voltage 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
V_OS
-400 399
% V_DD ¹⁾
Offset quantization
steps
∆V_OS
1.22
mV
@ V_DD = 5 V
generally V_DD / 4095
1) _{Infineon pre-calibrates the samples at zero field to 50% of VDD (100mT range) in the final test, but does not}
guarantee the accuracy of this calibration. It is crucial to do a final calibration of each IC within the application
using the Gain/V_OS value.
The offset value can be calculated by:
V_OS
=
(_{---O-----S----–-----1---6---3---8---4----})
4096
× V_DD
Data Sheet
19
V 2.08, 2008-09