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A3422EKA-T Datasheet(PDF) 7 Page - Allegro MicroSystems |
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A3422EKA-T Datasheet(HTML) 7 Page - Allegro MicroSystems |
7 / 11 page 3422 HALL-EFFECT, DIRECTION-DETECTION SENSOR IC , Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 6 Functional Description Outputs. The device provides three saturated outputs: DIRECTION, E1 OUTPUT, and SPEED. DIRECTION provides the direction output of the device and is defined as OFF (high) for the direction E1 to E2 and ON (low) for the direction E2 to E1. SPEED provides an XOR’d output of the two elements. Because of internal delays, DIREC- TION will always be updated before SPEED and is updated at every transition of E1 OUTPUT and E2 OUT- PUT (internal) allowing the use of up-down counters without the loss of pulses. Power-On State. At power on, the logic circutry is reset to provide an OFF (high) at DIRECTION and an OFF (high) for E1 and E2 (internal) for magnetic fields less than BOP. This eliminates ambiguity when the device is powered up and either element detects a field between BOP and BRP. If either element is subjected to a field greater than BOP, the internal logic will set accordingly. The integrated circuit contains an internal voltage regula- tor that powers the Hall elements and both the analog and digital circuitry. This regulator allows operation over a wide supply voltage range and provides some immunity to supply noise. The device also contains CMOS logic circuitry that decodes the direction of rotation of the ring magnet. Quadrature/Direction Detection. Internal logic circuitry provides outputs representing speed and direction of the magnetic field across the face of the package. For the direction signal to be appropriately updated, a quadra- ture relationship must be maintained between the ring magnet pole width*, the element-to-element spacing, and, to a lesser extent, the magnetic switch points. For optimal design, the device should be actuated with a ring magnet pole width* two times the sensor-to-sensor spacing. This will produce a sinusoidal magnetic field whose period (denoted as Τ) is then four times the element-to-element spacing. A quadrature relationship can also be maintained for a ring magnet that has a period that satisfies the rela- tionship nΤ/4 = 1.5 mm, where n is any odd integer. Therefore, ring magnets with pole-pair spacings equal to 6 mm (n = 1), 2 mm (n = 3), 1.2 mm (n = 5), etc. are permit- ted. The response of the device to the magnetic field produced by a rotating ring magnet is shown on page 2. Note the phase shift between the two elements. *“Pole” refers to a single pole (North or South) unless stated as “pole pair” (North and South). |
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