tle4942c Infineon Technologies Corporation, tle4942c Datasheet - Page 3

• Manufacturer Part Number: tle4942c
• Description: Differential Two-wire Hall Effect Sensor Ic
• Manufacturer: Infineon Technologies Corporation

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
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.
I
Figure 3
Figure 4
TLE4942 - TLE4942C Data Sheet
Magnetic Flux
Magnetic signal
Output Signal
Differential
Density
Pulse length
B
Zero-crossing principle and corresponding output pulses
Definition of differential magnetic flux density ranges
20mT and mechanical offsets are cancelled out through a
3
Range for EL pulse: B
Range for warning pulse: B
TLE4942, TLE4942C
(max .airgap
exceeded)
t
EL
B
Limit
February 2002
Warning