tle4942 Infineon Technologies Corporation, tle4942 Datasheet - Page 5

• Manufacturer Part Number: tle4942
• Description: Differential Two-wire Hall Effect Sensor-ic For Wheel Speed Applications With Direction Detection
• Manufacturer: Infineon Technologies Corporation

Data Sheet
Functional Description
The differential Hall Effect IC detects the motion of ferromagnetic or permanent magnet
structures by measuring the differential flux density of the magnetic field. To detect the
motion of ferromagnetic objects the magnetic field must be provided by a backbiasing
permanent magnet. Either the South or North pole of the magnet can be attached to the
rear, unmarked side of the IC package.
Magnetic offsets of up to ± 20 mT and mechanical offsets are cancelled out through a
self-calibration algorithm. Only a few transitions are necessary for the self-calibration
procedure. After the initial self-calibration sequence switching occurs when the input
signal crosses the arithmetic mean of its max. and min. values (e.g. zero-crossing for
sinusoidal signals).
The ON and OFF state of the IC are indicated by High and Low current consumption.
Each zero crossing of the magnetic input signal triggers an output pulse.
Figure 3
Magnetic Signal
Output Signal
Zero-Crossing Principle and Corresponding Output Pulses
Pulse
Length
5
TLE4942-1C
V 3. 1, 2005-02
TLE4942-1
AED03189