KMI15/1 Просмотр технического описания (PDF) - Philips Electronics

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KMI15/1

Integrated rotational speed sensor

Philips Electronics 

Philips Semiconductors

Integrated rotational speed sensor

Preliminary specification

KMI15/1

FUNCTIONAL DESCRIPTION

The KMI15/1 sensor is sensitive to the motion of ferrous

gear wheels or reference marks. The functional principle is

shown in Fig.3. Due to the effect of flux bending, the

different directions of magnetic field lines in the

magnetoresistive sensor element will cause an electrical

signal. Because of the chosen sensor orientation and the

direction of ferrite magnetization, the KMI15/1 is sensitive

to movement in the ‘y’ direction in front of the sensor only

(see Fig.2).

The magnetoresistive sensor element signal is amplified,

temperature compensated and passed to a Schmitt trigger

in the conditioning integrated circuit (Figs 4 and 5).

The digital output signal level (see Fig.6) is independent of

the sensing distance within the measuring range (Fig.14).

A (2-wire) output current enables safe transfer of the

sensor signal to the detecting circuit (see Fig.7).

The integrated circuit housing is separated from the

sensor element housing to optimize the sensor behaviour

at high temperatures.

handbook, halfpage x

y

magnet with

direction of

magnetization

x

z

sensor

IC

handbook, full pagewigdethar wheel

z

magnet

sensor y

(a)

1996 Dec 05

MBH778

Fig.2 Component detail of the KMI15/1.

magnetic

field lines

direction

of

motion

(b)

(c)

Fig.3 Functional principle.

4

MRA957

(d)

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