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ZMT31
ANGLE SENSOR
DESCRIPTION
The ZMT31 allows the contactless counting of the revolutions of a
rotating magnet which is mounted on the axis of a wheel. Zero output
voltages of the Wheatstones bridges are used as trigger signals. The
sense of rotation of the wheel is taken into account by comparing the
signal outputs of both Wheatstone bridges which are proportional to
sin2( ) or sin2( +45 ). The angle can be determined by evaluating these
signals. Alternatively it is possible to use the voltage signals of four half
bridges which are trimmed on V b/2 .
FEATURES
· Measures the magnetic field hrot (> 50kA/m)
generated by a permanent magnet which rotates
over the sensor
· Magnetic field hrot parallel to the chip surface causes
a sinusoidal output signal
SM8
· Package : SM-8 (available on 12mm tape)
APPLICATION
· Contactless counting of the revolutions of a rotating
magnet (watermeters etc.)
· Contactless angular measurement
· Automotive (pedal position etc.)
1
2
3
4
8
7
6
5
· Contactless rotary switches
· Contactless potentiometer
Bridge1:
Bridge 2:
pin 1: -V O pin 5: +VO
pin 8: -V B (GND) pin 4: +VB
pin 2: -V O pin 6: +VO
ORDERING INFORMATION
DEVICE REEL TAPE
QUANTITY
pin 7: -V B (GND) pin 3: +VB
V O - output voltage V B - supply voltage
SIZE
WIDTH
PER REEL
ZMT31TA
ZMT31TC
7
13
12mm
12mm
1000
4000
DEVICE MARKING
· ZMT31
ISSUE 4 - JUNE 2004
1
SEMICONDUCTORS
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