ZMZ20 Diodes Incorporated

ZMZ20 MAGNETIC FIELD SENSORS DESCRIPTION The ZMZ20 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 field component Hy. A perpendicular field Hx is necessary to suppress the hysteresis and this can be provided 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 and speed sensing Metering of fluids by sensing rotation of impeller Traffic counting and vehicle-type sensing Measurement of current in a conductor without connection PINOUT ORDERING INFORMATION DEVICE BOX ZMZ20 Bulk in box (2,000 components per box) DEVICE MARKING M20 SIDE VIEW ISSUE 2 - JANUARY 2004 SEMICONDUCTORS 1 E-LINEZMZ20 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL LIMIT UNIT Supply voltage V 12 V B Total power dissipation P 120 mW TOT Operating temperature range T -40 to +150 C amb ELECTRICAL CHARACTERISTICS (at T = 25C and Hx=3kA/m unless otherwise stated) amb PARAMETER SYMBO MIN. TYP. MAX. UNIT CONDITIONS Bridge resistance R 1.2 1.7 2.2 k br Output voltage range V /V 16 20 24 mV/V O B Open circuit sensitivity S 3.7 4.7 5.7 (mV/V)/(kA/m) No disturbing field H d allowed Hysteresis of output voltage V /V - - 50 V/V Hy = 2kA/m OH B Offset voltage V /V -1.0 - +1.0 mV/V off B Operating frequency f 0 - 1 MHz max Temperature coefficient of offset TCV +3 (V/V)/K T = -25 to +125C off amb voltages -3 - Temperature coefficient of bridge TCR 0.25 0.3 0.35 %/K T = -25 to +125C br amb resistance Temperature coefficient of open TCS -0.25 -0.3 -0.35 %/K T = -25 to +125C V amb circuit sensitivity V =5V B Temperature coefficient of open TCS - -0.1 - %/K T = -25 to +125C I amb circuit sensitivity I =3mA B ISSUE 2 - JANUARY 2004 SEMICONDUCTORS 2