DESCRIPTION The ZMZ20 is an extremely sensitive magnetic field sensor in a 4 pin 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
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