TLE4997
User’s Manual
Configuration & Calibration Parameters
User’s Manual
20
v01_01, 2019-08
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
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:
(4.1)
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:
(4.2)
Table 4-1
Range Setting
Parameter R
Range
Nominal Range in mT
1)
1) Absolute accuracy of range values is not specified.
3
Low
±50
1
2)
2) Setting R = 2 is not used, internally changed to R = 1.
Mid
±100
0
High
±200
Table 4-2
Gain
Parameter
Symbol
Values
Unit
Note / Test Condition
Min.
Typ.
Max.
Gain range
Gain
- 4.0
–
3.9998 –
1)2)
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.
Gain quantization steps
ΔGain
–
244.14 –
ppm
Corresponds to 1/4096
Gain
G 16384
–
(
)
4096
------------------------------
=
V
OS
OS 16384
–
(
)
4096
--------------------------------- V
×
DD
=
