ZMY20 MAGNETIC FIELD SENSOR 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. Hy Hx -VB +VB -VO +VO FEATURES • Output voltage proportional to magnetic field Hy • Adjustment of sensitivity and suppression of hysteresis by the auxiliary magnetic field Hx SOT223S • 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 PINOUT • Traffic counting & vehicle-type sensing -VB • Measurement of current in a conductor without connection +VO -VO +VB VB = SUPPLY VOLTAGE VO = OUTPUT VOLTAGE ORDERING INFORMATION DEVICE REEL SIZE TAPE WIDTH QUANTITY PER REEL ZMY20TA 7” 12mm 1000 units ZMY20TC 13” 12mm 4000 units Top View DEVICE MARKING • ZMY20 ISSUE 2 - NOVEMBER 2002 1 SEMICONDUCTORS ZMY20 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL LIMIT UNIT Supply voltage VB 12 V Total power dissipation P TOT 120 mW Operating temperature range T amb -40 to +150 °C Storage temperature range T stg -65 to +150 °C ELECTRICAL CHARACTERISTICS (at Tamb=25°C and HX=3 kA/m unless otherwise stated) PARAMETER SYMBOL MIN TYP MAX UNIT Bridge resistance TEST CONDITIONS R br 1.2 1.7 2.2 k⍀ Output voltage range V O /V B 16 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 V OH /V B - - 50 µV/V Hyⱕ 2kA/m Offset Voltage V off /V B -1.0 - +1.0 mV/V Operating frequency f max 0 - 1 MHz Temp. coeff. of offset voltage TCV off -3 - +3 (µV/V)/K Tamb= -25 to +125°C Temp. coeff. of bridge resistance TCR br 0.25 0.3 0.35 %/K Tamb= -25 to +125°C Temp. coeff. of open circuit sensitivity V B =5V TCS V -0.25 -0.3 -0.35 %/K Tamb= -25 to +125°C Temp. coeff. of open circuit sensitivity I B =3mA TCS I - -0.1 - %/K Tamb= -25 to +125°C ISSUE 2 - NOVEMBER 2002 SEMICONDUCTORS 2 ZMY20 Application 1 (digital output) Application 2 (analog output) ISSUE 2 - NOVEMBER 2002 3 SEMICONDUCTORS ZMY20 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 ISSUE 2 - NOVEMBER 2002 SEMICONDUCTORS 4 ZMY20 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 mm2 board (copper area 600mm2) ISSUE 2 - NOVEMBER 2002 5 SEMICONDUCTORS ZMY20 PACKAGE OUTLINE PAD LAYOUT CONTROLLING DIMENSIONS IN MILLIMETERS APPROX CONVERSIONS INCHES PACKAGE DIMENSIONS Millimeters Inches DIM Millimeters Inches DIM Min Max Min Max Min Max Min Max A - 1.80 - 0.071 e 2.30 BSC 0.0905 BSC A1 0.02 0.10 0.0008 0.004 e1 4.60 BSC 0.181 BSC b 0.66 0.84 0.026 0.033 E 6.70 7.30 0.264 0.287 b2 2.90 3.10 0.114 0.122 E1 3.30 3.70 0.130 0.146 C 0.23 0.33 0.009 0.013 L 0.90 - 0.355 - © Zetex plc 2002 Americas Asia Pacific Zetex GmbH Streitfeldstraße 19 D-81673 München Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY11788 Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 [email protected] USA Telephone: (631) 360 2222 Fax: (631) 360 8222 [email protected] Zetex (Asia) Ltd 3701-04 Metroplaza, Tower 1 Hing Fong Road Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 [email protected] Europe Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4422 Fax: (44) 161 622 4420 [email protected] 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 - NOVEMBER 2002 SEMICONDUCTORS 6