iC-MZ

DIFFERENTIAL HALL SWITCH

Rev A2, Page 6/11

DEFINITION OF MAGNETIC FIELDS AND SENSOR OUTPUT SIGNALS

In essence iC-MZ is non-magnetic and thus has prac-

tically no effect on the magnetic field to be scanned.

The Hall sensors on the topside of the chip or at pack-

magnetic field vector at the site of each sensor.

when the field lines emerge on the printed upper side

of the chip.

The source of the magnetic field (magnets, coils) can

be placed above or below (back bias) the iC package.

x

y

z

N

S

N

S

+B

+B

Figure 1: Example magnet positions in relation to

iC-MZ

of the magnetic field strengths at the site of the two

Hall sensors S1 and S2 is significant for the electrical

output signal.

∆

N

S

S1

H

1

H

2

H > 0

S2

Pin 1

S

N

S1

H

1

H

2

S2

Pin 1

x

y

z

H < 0

Figure 2: Definition of the difference in field strength

∆

H

In accordance with Figure 2 a distinction can be made

between the different position and polarity of a mag-

net from the sign of the sensor signal. Following the

amplification of the Hall voltage difference a differen-

tial analog signal V(A) or V(NA) is available at pins A

and NA with a mean voltage of Vdc (Figure 3).

D is switched back to low. The switching status com-

plementary to D is available at output ND.

interval, the momentary switching status of the driver

outputs does not change.

H

V

V(A)

Vdc

V(NA)

0

Figure 3: Analog signals A and NA as a function of

the difference in field strength ∆H

H

t,hi

H

= H

– H

t,hys

t,hi

t,lo

H

t,lo

V(D)

VB

0

H

Figure 4: Digital output D in dependence on the dif-

ference in field strength ∆H