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UGN3503U Datasheet(PDF) 4 Page - Allegro MicroSystems |
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UGN3503U Datasheet(HTML) 4 Page - Allegro MicroSystems |
4 / 8 page 3503 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 GEAR TOOTH SENSOR CURRENT MONITOR OPERATION The output null voltage (B = 0 G) is nominally one-half the supply voltage. A south magnetic pole, presented to the branded face of the Hall- effect sensor will drive the output higher than the null voltage level. A north magnetic pole will drive the output below the null level. In operation, instantaneous and proportional output-voltage levels are dependent on magnetic flux density at the most sensitive area of the device. Greatest sensitivity is obtained with a supply voltage of 6 V, but at the cost of increased supply current and a slight loss of output symmetry. The sensor's output is usually capacitively coupled to an amplifier that boosts the output above the millivolt level. In two applications shown, a permanent bias magnet is attached with epoxy glue to the back of the epoxy package. The presence of ferrous material at the face of the package acts as a flux concentrator. The south pole of a magnet is attached to the back of the package if the Hall-effect IC is to sense the presence of ferrous material. The north pole of a magnet is attached to the back surface if the integrated circuit is to sense the absence of ferrous matrial. Calibrated linear Hall devices, which can be used to determine the actual flux density presented to the sensor in a particular application, are available. SUFFIX “LT” SUFFIX “UA” Dwg. A-12,513 Dwg. A-12,512 N 3 1 2 NOTCH SENSOR Dwg. A-12,574 SENSOR LOCATIONS SUFFIX “U” A 1 3 Dwg. MH-002-5D 0.0165" 0.42 mm NOM 0.072" 1.83 mm BRANDED SURFACE ACTIVE AREA DEPTH 2 0.093" 2.37 mm 0.042" 1.08 mm 1 3 2 Dwg. MH-008-9A 0.0305" 0.775 mm NOM ACTIVE AREA DEPTH 0.091" 2.32 mm A 1 3 Dwg. MH-011-3D 0.0195" 0.50 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 2 0.056" 1.43 mm A 0.084" 2.13 mm |
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