TLE4925 datasheet(14/25 Pages) INFINEON

14 / 25 page

PRELIMINARY

Page 14 of 25

Application Configurations

Two possible applications are shown in Figure 8 and Figure 9 (Toothed and Magnet

Wheel).

The difference between two-wire and three-wire application is shown in Figure 12 for

the TLE4925C and in Figure 13 for the TLE4925.

Gear Tooth Sensing

In the case of ferromagnetic toothed wheel application the IC has to be biased by the

south or north pole of a permanent magnet (e.g. SmCO5 (Vacuumschmelze VX145))

with the dimensions 8 mm

× 5 mm × 3 mm) which should cover both Hall probes.

The maximum air gap depends on

the magnetic field strength (magnet used; pre-induction) and

the toothed wheel that is used (dimensions, material, etc.; resulting differential field).

centered distance

of Hall probes

Hall probes to

IC surface

IC surface to

tooth wheel

a = 2.5 mm

b = 0.3 mm

Figure 8

Sensor Spacing

Conversion DIN – ASA

m = 25.4 mm/p

T = 25.4 mm CP

DIN

diameter (mm)

number of teeth

module m = d/z (mm)

pitch T =

π × m (mm)

ASA

diameter pitch

p = z/d (inch)

pitch diameter

PD = z/p (inch)

circular pitch CP = 1 inch

× π/p

Figure 9

Toothed Wheel Dimensions

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