A dynamic differential Hall IC with current interface forautomotive sensor applications
Draxelmayr, D.; Borgschulze, R.
Solid-State Circuits Conference, 1997. Digest of Technical Papers. 43rd ISSCC., 1997 IEEE International
Volume , Issue , 6-8 Feb 1997 Page(s):204 - 205, 457
Digital Object Identifier 10.1109/ISSCC.1997.585334
Summary:Magnetic sensors based on the Hall effect are gaining increasing
importance for automotive applications. A vital field is the sensing of
rotating target wheels for crankshaft, camshaft, gearbox or wheel speed
detection. For reliable operation, magnetic differential fields ranging
from ±60 mT down to approximately ±1 mT (that corresponds
to a Hall voltage of 100 μV) superimposed by homogenous fields of
several 100 mT have to be resolved in an automotive environment. Major
requirements are: Tj=-50°C up to 210°C, supplies between 4.5 V
and approximately 30 V, immunity against supply ripple and radiated
energy, and protection against reversed supply polarity. In the
presented Hall IC, the magnetic field is sensed by two Hall probes
spaced at 2.5 mm. The Hall signals are subtracted and amplified to feed
a highpass filter including one external capacitor having a corner
frequency of a few Hertz. A Schmitt-trigger comparator generates
temperature-compensated thresholds. The chip is implemented in a
standard bipolar technology
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