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ZMT31
ANGLE SENSOR
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)
PINOUT DIAGRAM
1 2 3 4 8 7 6 5
APPLICATION
* Contactless counting of the revolutions of a rotating magnet (watermeters etc.) * Contactless angular measurement * Automotive (pedal position etc.) * Contactless rotary switches * Contactless potentiometer
Pin connection: Bridge1: pin 1: -VO pin 5: +VO pin 8: -VB (GND) pin 4: +VB Bridge 2: pin 2: -VO pin 6: +VO pin 7: -VB (GND) pin 3: +VB VO - output voltage VB - supply voltage
ORDERING INFORMATION
DEVICE ZMT31TA ZMT31TC REEL SIZE 7 13 TAPE WIDTH 12mm 12mm QUANTITY PER REEL 1000 4000
DE VICE MARKING
* ZMT31
ISSUE 2 - FEBRUARY 2002 1
ZMT31
PARAMETER Supply Voltage Total power dissipation Operating tempersture range Storage temperature range Sensor chip alignment error SYMBOL VB Ptot Tamb Tstg LIMIT 5 120 -25 to +100 -40 to +125 2 UNIT V mW C C
e
PARAMETER Bridge resistance Offset voltage Sensitivety Half bridge symmetry Output voltage range Zero offset angle hysteresis Temperature coefficient of the bridge resistance -25 C SYMBOL R br V Off / V B S
MIN. 2.0 -2.0 0.2 -2.0 16
TYP. 3.0
MAX. 4.0 +2.0
UNIT k mV/V (mV/V)/
TEST CONDITIONS
bridge 1: bridge 2: bridge 1: bridge 2: bridge 1: bridge 2:
=45 ; =0 =0 ; =45 =0 ; =45
(V S /2-V O )/V B (|Vmax|+|Vmin|) /V B
+2.0
mV/V mV/V
2 T CBR 0.25 0.30 0.35 %/K
T CSV T CSI T COFF
-0.35 -0.05 -3
-0.30 0
-0.25 0.05 +3
%/K %/K ( V/V)/K
V B = const. I B = const
ISSUE 2 - FEBRUARY 2002 2
ZMT31
Output Voltage of both Wheatstone bridges versus angle
of the magnetic fielddirection
-0.5
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ZMT31
PACKAGE OUTLINE PACKAGE DIMENSIONS
MILLIMETRES DIM MIN A A1 b c D E e1 e2 He Lp 0.02 MAX 1.7 0.1
0.7 TYP 0.24 6.3 3.3 0.32 6.7 3.7
4.59 TYP 1.53 TYP 6.7 0.9 15 10 TYP 7.3
(c) Zetex plc 2001
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 Munchen 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
ISSUE 2 - FEBRUARY 2002 4
ZMT31
IG N O RE TH IS PA G E
ISSUE 2 - FEBRUARY 2002 1

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