tle4997i Infineon Technologies Corporation, tle4997i Datasheet - Page 13

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

Ratiometry
The linear Hall sensor works like a potentiometer. The output voltage is proportional to
the supply voltage. The division factor depends on the magnetic field strength.
This behavior is called ’ratiometric’.
The supply voltage
µController. In this case variations of
The ratiometry error is defined as follows:
The ratiometry error band displays as ’Butterfly Curve’.
Figure 4
The error band in the extended V
shown in
signal. For V
the value for n is 5%. And if V
Note: Take care of possible voltage drops on the V
Preliminary Data Sheet
E
E
RAT
RAT
%
result. Ideally, both values are acquired and their ratio is calculated to gain the
highest accuracy. Especially during calibration this method should be used.
=
-0.25
-0.75
0.75
0.25
-0.5
0.5



Figure
V
------------------------------ -
n
1
-n
-1
0
OUT
OUT
V
Ratiometry Error Band
DD
(
V
4. In the range from 6 to 7 Volts the error band depends on the output
lower 20% of V
DD
V
)
4
DD
–
V
-------------------------- -
OUT
should be used as reference for the A / D converter of the
5V
OUT
(
5V
DD
)
is kept (clamped) in between, the value for n is 1%.



DD
the value for n is 2%. For V
×
V
100
range below 4.5V and above 5.5V is defined as
DD
5
are compensated.
%
13
Electrical and Magnetic Parameters
DD
and V
6
OUT
OUT
higher 80% of V
line degrading the
V 1.01, 2006-09
V
TLE4997I
DD
7
V
DD