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A3245 Datasheet(PDF) 8 Page - Allegro MicroSystems |
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A3245 Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 12 page 8 A3245-DS, Rev. 1 Worcester, Massachusetts 01615-0036 (508) 853-5000 115 Northeast Cutoff, Box 15036 www.allegromicro.com Allegro MicroSystems, Inc. Chopper-Stabilized Omnipolar Hall Effect Switches A3245 Functional Description BHYS BHYS VS VOUT(SAT) B+ B– V+ 0 0 VCC VS Sensor Output GND VOUT RLOAD A3245 0.1 μF CBYP Operation The output of this device switches low (turns on) when a mag- netic field perpendicular to the Hall sensor exceeds the operate point, BOPS (or is less than BOPN). After turn-on, the output voltage is VOUT(SAT). The output transistor is capable of sink- ing current up to the short circuit current limit, IOM, which is a minimum of 30 mA. When the magnetic field is reduced below the release point, BRPS (or increased above BRPN), the device output switches high (turns off). The difference in the magnetic operate and release points is the hysteresis, BHYS, of the device. This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. Powering-on the device in a hysteresis region, between BOPX and BRPX, allows an indeterminate output state. The correct state is attained after the first excursion beyond BOPX or BRPX. Applications It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor) between the supply and ground of the device to reduce both external noise and noise generated by the chopper stabilization technique. As is shown in Panel B of figure 1, a 0.1μF capacitor is typical. Omnipolar switches allow operation with either a north pole or south pole magnet orientation, enhancing product manufactur- ability with the device. Extensive applications information on magnets and Hall-effect sensors is available in: • Hall-Effect IC Applications Guide, AN27701, • Hall-Effect Devices: Gluing, Potting, Encapsulating, Lead Welding and Lead Forming, AN27703.1 • Soldering Methods for Allegro’s Products – SMT and Through- Hole, AN26009 All are provided in Allegro Electronic Data Book, AMS-702 and the Allegro Web site: www.allegromicro.com Figure 1: Switching Behavior of Omnipolar Switches. In Panel A, on the horizontal axis, the B+ direction indicates increasing south polarity magnetic field strength, and the B– direction indicates decreasing south polarity field strength (including the case of increasing north polarity). This behavior can be exhibited when using a circuit such as that shown in panel B. (A) (B) |
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