DESCRIPTION
The ZMT31 allows the contactless counting of thr 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 Vb/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
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.)
Contactless rotary switches
Contactless potentiometer
DE VICE MARKING
ZMT31
ZMT31
ISSUE 2 - FEBRUARY 2002
1
ANGLE SENSOR
1
4
2
3
8
5
7
6
PINOUT DIAGRAM
Pin connection:
Bridge1: pin 1: -V
O
pin 5: +V
O
pin 8: -V
B
(GND) pin 4: +V
B
Bridge 2: pin 2: -V
O
pin 6: +V
O
pin 7: -V
B
(GND) pin 3: +V
B
V
O
- output voltage V
B
- supply voltage
DEVICE
REEL
SIZE
TAPE
WIDTH
QUANTITY
PER REEL
ZMT31TA
7
12mm
1000
ZMT31TC
13
12mm
4000
ORDERING INFORMATION
ZMT31
ISSUE 2 - FEBRUARY 2002
2
PARAMETER
SYMBOL
LIMIT
UNIT
Supply Voltage
VB
5
V
Total power dissipation
Ptot
120
mW
Operating tempersture range
Tamb
-25 to +100
C
Storage temperature range
Tstg
-40 to +125
C
Sensor chip alignment error
e
2
PARAMETER
SYMBOL
MIN.
TYP.
MAX.
UNIT
TEST
CONDITIONS
Bridge resistance
Rbr
2.0
3.0
4.0
k
Offset voltage
VOff / VB
-2.0
+2.0
mV/V
bridge 1:
=45 ;
bridge 2:
=0
Sensitivety
S
0.2
(mV/V)/
bridge 1:
=0 ;
bridge 2:
=45
Half bridge symmetry
(VS/2-VO)/VB
-2.0
+2.0
mV/V
bridge 1:
=0 ;
bridge 2:
=45
Output voltage range
(
|
Vmax
|+|
Vmin
|)
/VB
16
mV/V
Zero offset angle
hysteresis
2
Temperature coefficient of
the bridge resistance -25 C
<Tamb <100 C
TCBR
0.25
0.30
0.35
%/K
Temperature coefficient of
the open circuit sensitivity
-25 C <Tamb <100 C
TCSV
-0.35
-0.30
-0.25
%/K
VB = const.
TCSI
-0.05
0
0.05
%/K
IB = const
Temperature coefficient of
the offset voltage -25 C
<Tamb <100 C
TCOFF
-3
+3
( V/V)/K
ZMT31
ISSUE 2 - FEBRUARY 2002
3
-0.5
Output Voltage of both Wheatstone bridges versus angle
of the magnetic fielddirection
Zetex plc
Fields New Road
Chadderton
Oldham, OL9 8NP
United Kingdom
Telephone (44) 161 622 4422
Fax: (44) 161 622 4420
Zetex GmbH
Streitfeldstrae 19
D-81673 Mnchen
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
Zetex Inc
700 Veterans Memorial Hwy
Hauppauge, NY11788
USA
Telephone: (631) 360 2222
Fax: (631) 360 8222
Zetex (Asia) Ltd
3701-04 Metroplaza, Tower 1
Hing Fong Road
Kwai Fong
Hong Kong
Telephone: (852) 26100 611
Fax: (852) 24250 494
These offices are supported by agents and distributors in major countries world-wide.
This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced
for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company
reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.
For the latest product information, log on to
www.zetex.com
Zetex plc 2001
ZMT31
4
ISSUE 2 - FEBRUARY 2002
DIM
MILLIMETRES
MIN
MAX
A
1.7
A1
0.02
0.1
b
0.7 TYP
c
0.24
0.32
D
6.3
6.7
E
3.3
3.7
e1
4.59 TYP
e2
1.53 TYP
He
6.7
7.3
Lp
0.9
15
10 TYP
PACKAGE DIMENSIONS
PACKAGE OUTLINE
ZMT31
ISSUE 2 - FEBRUARY 2002
1
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