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4
Configuration & Calibration Parameters
This chapter describes the configuration and calibration parameters that can be set in the EEPROM of the
TLE4997 (see EEPROM map,
4.1
Magnetic Field Range - R
Table 4-1
Range Setting
Parameter R
3
2)
1
0
1) Absolute accuracy of range values is not specified.
2) Setting R = 2 is not used, internally changed to R = 1.
4.2
Gain Setting - G
The overall sensitivity is defined by the range and the gain setting. The output of the ADC is multiplied by the Gain
value. The Gain value is given by:
(
)
G 16384
–
----------------------------- -
Gain
=
4096
Table 4-2
Gain
Parameter
Gain range
Gain quantization steps
1) For Gain values between -0.5 and +0.5, the numerical accuracy decreases.
To obtain a flatter output curve, it is recommended to select a higher range setting.
2) In 100 mT range, a gain value of +1.0 corresponds to typically 40mV/mT. Infineon pre-calibrates the samples to 60mV/mT..
It is recommended to do a final 2-point calibration of each IC within the application.
4.3
Offset Setting - OS
The offset value corresponds to an output voltage with zero field at the sensor. The offset value can be calculated
by:
(
)
OS 16384
–
---------------------------------
V
=
OS
4096
User's Manual
Chapter
3.5)
Range
Low
Mid
High
Symbol
Gain
ΔGain
×
V
DD
Configuration & Calibration Parameters
Values
Min.
Typ.
Max.
- 4.0
–
3.9998
–
244.14
–
20
User's Manual
Nominal Range in mT
±50
±100
±200
Unit
Note / Test Condition
1)2)
–
ppm
Corresponds to 1/4096
v01_01, 2019-08
TLE4997
1)
(4.1)
(4.2)
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