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
·
Package : SM-8 (available on 12mm tape)
SM8
1
2
3
4
Bridge1:
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
Bridge 2:
pin 1: -V
O
pin 5: +VO
pin 8: -V
B
(GND) pin 4: +VB
pin 2: -V
O
pin 6: +VO
pin 7: -V
B
(GND) pin 3: +VB
ORDERING INFORMATION
DEVICE
ZMT31TA
ZMT31TC
REEL
SIZE
7
13
TAPE
WIDTH
12mm
12mm
QUANTITY
PER REEL
1000
4000
V
O
- output voltage V
B
- supply voltage
DEVICE MARKING
·
ZMT31
ISSUE 4 - JUNE 2004
1
SEMICONDUCTORS
ZMT31
PARAMETER
Supply voltage
Total power dissipation
Operating temperature range
Storage temperature range
Sensor chip alignment error
SYMBOL
V
B
P
tot
T
amb
T
stg
e
LIMIT
5
120
-25 to +130
-40 to +130
2
UNIT
V
mW
C
C
PARAMETER
Bridge resistance
Offset voltage
SYMBOL
R
br
V
Off
/ V
B
MIN.
2.0
-2.0
TYP.
3.0
MAX.
4.0
+2.0
UNIT
k
mV/V
TEST
CONDITIONS
bridge 1:
bridge 2:
=45 ;
=0
=0 ;
=45
=0 ;
=45
Sensitivity
S
0.2
(mV/V)/
bridge 1:
bridge 2:
Half bridge symmetry
(V
S
/2-V
O
)/V
B
-2.0
+2.0
mV/V
bridge 1:
bridge 2:
Output voltage range
Zero offset angle hysteresis
Temperature coefficient of
the bridge resistance -25 C
<T
amb
<100 C
Temperature coefficient of
the open circuit sensitivity
-25 C <T
amb
<100 C
Temperature coefficient of
the offset voltage -25 C
<T
amb
<100 C
(|Vmax|+|Vmin|) /V
B
16
2
mV/V
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 4 - JUNE 2004
SEMICONDUCTORS
2
ZMT31
Output voltage of both Wheatstone bridges versus angle
of the magnetic field direction
ISSUE 4 - JUNE 2004
3
SEMICONDUCTORS
ZMT31
PACKAGE OUTLINE
Controlling dimensions are in millimeters. Approximate conversions are given in inches
PACKAGE DIMENSIONS
Millimeters
DIM
Min
A
A1
b
c
D
E
-
0.02
-
0.24
6.3
3.3
Max
1.7
0.1
-
0.32
6.7
3.7
Typ.
-
-
0.7
-
-
-
Min
-
Max
0.067
Typ.
-
-
0.0275
-
-
-
e1
e2
He
Lp
Inches
DIM
Min
-
-
6.7
0.9
-
-
Max
-
-
7.3
-
15°
-
Typ.
4.59
1.53
-
-
-
10°
Min
-
-
Max
-
-
Typ.
0.1807
0.0602
-
-
-
10°
Millimeters
Inches
0.008 0.004
-
-
0.264 0.287
0.035
-
-
-
15°
-
0.009 0.013
0.248 0.264
0.130 0.145
© Zetex Semiconductors plc 2004
Europe
Zetex GmbH
Streitfeldstraße 19
D-81673 München
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
europe.sales@zetex.com
Americas
Zetex Inc
700 Veterans Memorial Hwy
Hauppauge, NY 11788
USA
Telephone: (1) 631 360 2222
Fax: (1) 631 360 8222
usa.sales@zetex.com
Asia Pacific
Zetex (Asia) Ltd
3701-04 Metroplaza Tower 1
Hing Fong Road, Kwai Fong
Hong Kong
Telephone: (852) 26100 611
Fax: (852) 24250 494
asia.sales@zetex.com
Corporate Headquarters
Zetex plc
Lansdowne Road, Chadderton
Oldham, OL9 9TY
United Kingdom
Telephone (44) 161 622 4444
Fax: (44) 161 622 4446
hq@zetex.com
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 4 - JUNE 2004
SEMICONDUCTORS
4
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