tle4997i Infineon Technologies Corporation, tle4997i Datasheet - Page 27

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

9
For the calibration of the sensor, a special hardware interface to an external computing
system and measurement equipment is required. All calibration and setup bits can be
written into a RAM memory. This allows to keep the EEPROM untouched during the
whole calibration process. Therefore this temporary setup (using the RAM only) does not
stress the EEPROM - and allows even a pre-verification
programming - as the number of the EEPROM programming cycles is limited to provide
a high data endurance.
The digital signal processing is completely deterministic. This allows a two point
calibration in one step without iterations. The two magnetic fields (here described as two
“positions” of an external magnetic circuitry) need only to be applied only once.
Furthermore, a complete setup and calibration procedure can be performed requiring
only one EEPROM programming cycle at the end
After setting up the temperature coefficients, the calibrated Hall ADC values of both
positions need to be read and the sensor output signals (using a DAC test mode) need
to be acquired for the corresponding end points. Using this data, the signal processing
parameters can be immediately calculated with a program running on the external
computing system.
Please note, the calibration and programming process must be performed at start of life
only.
Table 17
Parameter
Temp. of sensor at 2 point
calibr. and programming
2 point calibration
accuracy
1)
Note: Depending on the application and external instrumentation setup, the accuracy of
1)
2)
Preliminary Data Sheet
Setup and validation performed at start of life.
But this feature is not required for a deterministic two point setup to fulfill the specification.
Details and basic algorithms for this step are available on request.
the 2 point calibration can be better.
1)
Calibration
Calibration Characteristics
Symbol Limit Values
t
∆ V
CAL
CAL1
min.
10
-0.5
27
max.
30
0.5
2)
.
Unit
°C
% of VDD in both positions
1)
of the setup before
Notes
V 1.01, 2006-09
Calibration
TLE4997I