iC-MZ

DIFFERENTIAL HALL SWITCH

Rev B1, Page 2/12

DESCRIPTION

Hall-effect device iC-MZ is a differential magnetic

sensor used to scan pole wheels or ferromagnetic

gear wheels. It contains two Hall sensors set 2.0 mm

apart, a differential amplifier with a back-end com-

parator and a complementary line driver. A difference

in field strength of the magnetic normal components

at iC-MZ’s two Hall elements is amplified and eval-

uated as an analog signal and fed to the integrated

line drivers as a complementary digital signal. The

digital output signal tracks the change in sign of the

field strength difference with a given hysteresis and

thus provides a clear switch.

With a moving gear or pole wheel the frequency of

the tooth or pole pair corresponds to the frequency

of the output signal. The amplified analog differential

sensor signal is available for diagnostic purposes at

pins A and NA.

Once the device has been switched on the digital out-

puts are initially in a predefined start state with D at

low and ND at high; the analog outputs A and NA

switched to high impedance. Following a delay of

about 200 µs the analog outputs are activated and

the status of the two Hall sensors ist transmitted by

the line drivers if the difference in field strength is suf-

ficiently strong.

The complementary line drivers are suitable for sup-

ply voltages of 4.5 to 36 V with output impedances

between 40 and 110 Ω. An integrated over temper-

ature and undervoltage monitor switches the output

stages to high impedance in the event of error and

activates the open drain output NERR.

By activating the TEST input the device can be used

as an independent two-channel line driver. In this

case, the outputs D and ND are controlled by the in-

puts A and NA.

The analog section of the iC-MZ circuit is fed by an

internal supply of 5 V which is available at pin VPA

for reference purpose. To improve signal quality, a

capacitor can be connected to this pin.

PACKAGING INFORMATION

PIN CONFIGURATION DFN10

iC-MZ

...

...yyww

6

9

7

8

10

5

2

4

3

1

EP

PIN FUNCTIONS

No. Name Function

1 GND1 Ground

2 D

Digital Output, not inverted

3 VB

Supply Voltage

4 ND

Digital Output, inverted

5 GND2 Ground

6 TEST Linedriver Test Mode

7 NERR Error Output, open drain

8 VPA

Internal 5 V Supply Voltage

9 NA

Analog Output, invertiert

10 A

Analog Output, non invertierend

EP

Exposed Pad

GND1 and GND2 have to be tied together to a common ground. Connect the Exposed Pad EP to this common

ground. Use a large ground plane to improve thermal performance. EP is not intended as an electrical connection

point. Orientation of the logo (

MZ CODE ...) is subject to alteration.