iC-MZ
DIFFERENTIAL HALL SWITCH
Rev A2, Page 2/11
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.
PACKAGES
PIN CONFIGURATION
PIN FUNCTIONS
No. Name Function
1
2
3
4
5
6
7
8
9
10
GND1
D
VB
ND
GND2
TEST
NERR
VPA
NA
A
Ground
Digital Output, not inverted
Supply Voltage
Digital Output, inverted
Ground
Linedriver Test Mode
Error Output, open drain
Internal 5 V Supply Voltage
Analog Output, invertiert
Analog Output, non invertierend
1
2
3
10
9
4
5
iC-MZ
...
...yyww
8
7
6
For improved thermal dissipation the thermal pad on the package underside should be connected to ground in a
suitable manner (ground
plane).
GND1 and GND2 should both be connected to ground.
Orientation of the logo ( MZ CODE ...) is subject to alteration.
ICHAUS [ IC-HAUS GMBH ]
