TLE4990 Datasheet, PDF (16/24 Pages) Infineon Technologies AG – Programmable Linear Output Hall Sensor

TLE4990
Programmable Linear Hall Sensor
Signal Processing
6.4
Clamping (not enabled in -E6782 version)
The clamping function is useful to split the output voltage range into operating range and
error ranges.
If the magnetic field is outside the selected measurement range, the output voltage V_out
is limited to the clamping values.
Therefore an output voltage in the error range indicates a wire breakage (see Open
Circuit (OBD parameters), Table 12) or a short circuit.
The clamping function is enabled, when the clamp bit is set.
Table 11 Clamping Ranges
Parameter
Symbol Limit Values
min. max.
Clamping voltage low V_CL,low 8
12
Clamping voltage high V_CL,high 88 92
1) _{RLOAD ≥ 4.7 kΩ}
Unit
%
%
Notes
of V_DD ¹⁾
of V_DD ¹⁾
The following figure shows how the magnetic field range between B_min and B_max is
mapped to voltages between 0.5 V and 4.5 V.
If it is not necessary to signal errors, the clamping should be disabled. In this case the
maximum output voltage range between 0.3 V and 4.7 V can be used.
V_out (V)
5
4
3
2
1
0
B_min
Error range
Operating range
Error range
Figure 5 Clamping
Data Sheet
16
V _CLH
V_CLL
B_max
B
V 2.0, 2004-05