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MAGNETIC FIELD SENSORS
DESCRIPTION
The ZMZ20M is an extremely sensitive magnetic field sensor ina4pin
E-line package employing the magneto-resistive effects of thin film
Permalloy. It allows the measurement of magnetic fields or the detection
of metallic parts. The sensor consists of a chip covered with Permalloy
stripes which form a Wheatstone bridge, whose output voltage is
proportional to the magnetic fieldcomponentHy.A perpendicular field Hx
is necessary to suppress the hysteresis and this is provided by an internal
permanent magnet.
FEATURES
Output voltage proportional to magnetic field Hy
•
Magnetic fields vertical to the chip level are not
•
effective
APPLICATIONS
Linear position sensors for process control, door
•
interlocks, proximity detectors, machine tool
sensing
•
Scalar measurement for compassing
•
Automotive - door switches, engine position and
speed sensing
•
Metering of fluids by sensing rotation of impeller
•
Traffic counting & vehicle-type sensing
•
Measurement of current in a conductor without
connection
ZMZ20M
Hy
Hx
I
-
E
N
E
L
ORDERING INFORMATION
DEVICE BOX
ZMZ20M
Bulk in box (2,000 components per box)
DEVICE MARKING
•
M2M
ISSUE 2 - MARCH 2004
PINOUT
SIDE VIEW
1
SEMICONDUCTORS
Page 2
ZMZ20M
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL LIMIT UNIT
Supply voltage V
Total power dissipation P
Operating temperature range T
B
TOT
amb
12 V
120 mW
-25 to +125 °C
ELECTRICAL CHARACTERISTICS (at T
= 25°C unless otherwise stated)
amb
PARAMETER SYMBOL MIN. TYP. MAX. UNIT CONDITIONS
Bridge resistance R
Output voltage range V
br
O/VB
1.2 1.7 2.2 k⍀
12 18 24 mV/V
Auxiliary field Hx - 2.5 - kA/m
Disturbing field H
d
- - 30 kA/m
Open circuit sensitivity S 3.0 5.0 7.0 (mV/V)/(kA/m) No disturbing field H
allowed
Hysteresis of output voltage V
Offset voltage V
Operating frequency f
Temperature coefficient of offset
voltages
Temperature coefficient of bridge
resistance
Temperature coefficient of open
circuit sensitivity
=5V
V
B
OH/VB
off/VB
max
TCV
TCR
TCS
off
br
V
- - 50 µV/V Hy ⱕ 2kA/m
-1.5 - +1.5 mV/V
0 - 1 MHz
-3 - +3 (µV/V)/K T
0.25 0.3 0.35 %/K T
-0.25 -0.3 -0.35 %/K T
= -25 to +125°C
amb
= -25 to +125°C
amb
= -25 to +125°C
amb
d
SEMICONDUCTORS
ISSUE 2 - MARCH 2004
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Sensor output characteristic
ZMZ20M
Vo(mV/V)
15
10
5
0
-5
-10
-15
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
Vo=f(Hy)typ.
Hy(kA/m)
ZMZ20M
VB(V)
14.000
12.000
10.000
8.000
6.000
4.000
2.000
0.000
-50 0 50 100 150 200
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Supply voltage (maximum) derating curve
ZMZ20M
V
bmax
=f(T
T
amb
3
amb
(˚C )
)
SEMICONDUCTORS
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ZMZ20M
B
PACKAGE OUTLINE
A
E
G
D
GG
R
B
H
C
B1
F
L
Controlling dimensions are in millimeters. Approximate conversions are given in inches
PACKAGE DIMENSIONS
DIM
© Zetex 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
These offices are supported by agents and distributors in major countries world-wide.
This publicationis issued toprovide outline informationonly which (unlessagreed by theCompany in writing)may not beused, applied or reproduced
for any purposeor 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
Millimeters Inches
Min Max Min Max
A 0.8 1.0 0.032 0.039
B 0.35 0.48 0.014 0.019
B1 0.45 0.60 0.018 0.024
C 4.0 4.4 0.158 0.173
D 3.8 4.2 0.150 0.165
E 2.4 2.8 0.094 0.110
F
1.2
- 0.047 -
G 1.25 - 0.049 -
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
www.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 Headquaters
Zetex plc
Fields New Road, Chadderton
Oldham, OL9 8NP
United Kingdom
Telephone (44) 161 622 4444
Fax: (44) 161 622 4446
hq@zetex.com
ISSUE 2 - MARCH 2004
SEMICONDUCTORS
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