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SEMICONDUCTORS
DESCRIPTION
The ZMY20 is an extremely sensitive magnetic sensor employing the
magneto-resistive effect of thin film permalloy. It allows the measurement of
magnetic fields or the detection of magnetic parts. The highly sensitive and
small size magnetoresistive sensors consist of a chip covered with thin film
permalloy stripes. These stripes form a Wheatstone bridge, whose output
voltage is proportional to the magnetic field component Hy. A perpendicular
field Hx is necessary to stabilize sensor operation. This can be done by using a
small permanent magnet.
FEATURES
•Output voltage proportional to magnetic field Hy
•Adjustment of sensitivity and suppression of
hysteresis by the auxiliary magnetic field Hx
•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 &
speed sensing
•Metering of fluids by sensing rotation of impeller
•Traffic counting & vehicle-type sensing
•Measurement of current in a conductor without
connection
DEVICE MARKING
•ZMY20
ZMY20
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MAGNETIC FIELD SENSOR
DEVICE REEL
SIZE
TAPE
WIDTH
QUANTITY
PER REEL
ZMY20TA 7” 12mm 1000 units
ZMY20TC 13” 12mm 4000 units
ORDERING INFORMATION
V = SUPPLY VOLTAGE
V = OUTPUT VOLTAGE
B
O
+V
B
-V
B
-V
O
+V
O
Top View
PINOUT
+VO
+VB
-VO
-VB
Hy
Hx
SOT223S
ZMY20
SEMICONDUCTORS
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PARAMETER SYMBOL MIN TYP MAX UNIT TEST CONDITIONS
Bridge resistance Rbr 1.2 1.7 2.2 k⍀
Output voltage range VO/VB16 20 24 mV/V
Open circuit sensitivity S 3.7 4.7 5.7 (mV/V)/
(kA/m)
No disturbing field Hd
allowed
Hysteresis of output
voltage
VOH/VB- - 50 µV/V Hyⱕ2kA/m
Offset Voltage Voff/VB-1.0 - +1.0 mV/V
Operating Frequency fmax 0 - 1 MHz
Temp. Coeff. of offset
voltage
TCVoff -3 - +3 (µV/V)/K Tamb= -25 to +125°C
Temp. Coeff. Of bridge
resistance
TCRbr 0.25 0.3 0.35 %/K Tamb= -25 to +125°C
Temp. Coeff. of open
circuit sensitivity
VB=5V
TCSV-0.25 -0.3 -0.35 %/K Tamb= -25 to +125°C
Temp. Coeff. of open
circuit sensitivity
IB=3mA
TCSI- -0.1 - %/K Tamb= -25 to +125°C
PARAMETER SYMBOL LIMIT UNIT
Supply Voltage VB12 V
Total power dissipation PTOT 120 mW
Operating Temperature Range Tamb -40 to +150 °C
Storage Temperature Range Tstg -65 to +150 °C
ABSOLUTE MAXIMUM RATINGS.
ELECTRICAL CHARACTERISTICS.(at Tamb=25°C and HX=3 kA/m unless otherwise stated)
ZMY20
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Application 1 (digital output)
Application 2 (analog output)
ZMY20
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Sensor output characteristic
VO=f(Hy); Hx-parameter
Vb=const; Tamb=25°C
Safe operating area
Hxtot=Hx+ Hd; Tamb=25°C; (Hd=disturbing field)
The sensor has to be reset after leaving the safe operating area by an auxiliary field of Hx=3kA/m
ZMY20
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Sensor sensitivity characteristic
S=f(Hx)
Vb=const; Tamb=25°C
Supply voltage (maximum) derating curve
VBmax=f(Tamb)
Device mounted on 40 x 40 mm2board (copper area 600mm2)
CONTROLLING DIMENSIONS IN MILLIMETRES
APPROX CONVERSIONS INCHES.
ZMY20
SEMICONDUCTORS
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PACKAGE OUTLINE
ZMY20
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Definitions
Product change
Zetex Semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or service.
Customers are solely responsible for obtaining the latest relevant information before placing orders.
Applications disclaimer
The circuits in this design/application note are offered as design ideas. It is the responsibility of the user to ensure that the circuit is fit for the user's
application and meets with the user's requirements. No representation or warranty is given and no liability whatsoever is assumed by Zetex with
respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or
otherwise. Zetex does not assume any legal responsibility or will not be held legally liable (whether in contract, tort (including negligence),
breach of statutory duty, restriction or otherwise) for any damages, loss of profit, business, contract, opportunity or consequential loss in the use
of these circuit applications, under any circumstances.
Life support
Zetex products are specifically not authorized for use as critical components in life support devices or systems without the express written
approval of the Chief Executive Officer of Zetex Semiconductors plc. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body
or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions
for use provided in the labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Reproduction
The product specifications contained in this publication are 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.
Terms and Conditions
All products are sold subjects to Zetex' terms and conditions of sale, and this disclaimer (save in the event of a conflict between the two when the
terms of the contract shall prevail) according to region, supplied at the time of order acknowledgement.
For the latest information on technology, delivery terms and conditions and prices, please contact your nearest Zetex sales office.
Quality of product
Zetex is an ISO 9001 and TS16949 certified semiconductor manufacturer.
To ensure quality of service and products we strongly advise the purchase of parts directly from Zetex Semiconductors or one of our regionally
authorized distributors. For a complete listing of authorized distributors please visit: www.zetex.com/salesnetwork
Zetex Semiconductors does not warrant or accept any liability whatsoever in respect of any parts purchased through unauthorized sales
channels.
ESD (Electrostatic discharge)
Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices. The
possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent of damage
can vary from immediate functional or parametric malfunction to degradation of function or performance in use over time. Devices suspected of
being affected should be replaced.
Green compliance
Zetex Semiconductors is committed to environmental excellence in all aspects of its operations which includes meeting or exceeding regulatory
requirements with respect to the use of hazardous substances. Numerous successful programs have been implemented to reduce the use of
hazardous substances and/or emissions.
All Zetex components are compliant with the RoHS directive, and through this it is supporting its customers in their compliance with WEEE and
ELV directives.
Product status key:
"Preview"Future device intended for production at some point. Samples may be available
"Active"Product status recommended for new designs
"Last time buy (LTB)"Device will be discontinued and last time buy period and delivery is in effect
"Not recommended for new designs"Device is still in production to support existing designs and production
"Obsolete"Production has been discontinued
Datasheet status key:
"Draft version"This term denotes a very early datasheet version and contains highly provisional
information, which may change in any manner without notice.
"Provisional version"This term denotes a pre-release datasheet. It provides a clear indication of anticipated performance. However, changes to
the test conditions and specifications may occur, at any time and without notice.
"Issue"This term denotes an issued datasheet containing finalized specifications. However, changes to specifications may occur, at any time and
without notice.
ZMY20
SEMICONDUCTORS
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ISSUE 3 - JUNE 2007
Europe
Zetex GmbH
Kustermann-Park
Balanstraße 59
D-81541 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 Semiconductors plc
Zetex Technology Park
Chadderton, Oldham, OL9 9LL
United Kingdom
Telephone (44) 161 622 4444
Fax: (44) 161 622 4446
hq@zetex.com
© Zetex Semiconductors plc 2007
