TLE4925 Datasheet, PDF (4/25 Pages) Infineon Technologies AG – Differential Hall Sensor

PRELIMINARY
Running mode:
In running mode the output is triggered by the comparator. An offset cancellation
feedback loop is formed by the A/D converter, dsp and offset cancellation D/A
converter. In running mode switching always occurs at zero-crossing. It is only affected
by the (small) remaining offset of the comparator and by the remaining propagation
delay time of the signal path, mainly determined by the noise-shaping filter. Nevertheless
signals below a defined threshold are not detected to avoid unwanted parasitic
switching.
peak detection
offset= (max + min) / 2
offset
offset
correction
startup-mode
Figure 3: Startup of the device
running-mode
At transition from startup-mode to running mode switching timing is moving
from low-accuracy to high accuracy zero-crossing.
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