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A3241LUA Datasheet(PDF) 8 Page - Allegro MicroSystems |
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A3241LUA Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 12 page 8 A3241-DS, Rev. 2 Worcester, Massachusetts 01615-0036 (508) 853-5000 115 Northeast Cutoff, Box 15036 www.allegromicro.com Allegro MicroSystems, Inc. Chopper-Stabilized Unipolar Hall Effect Switches A3241 and A3242 Functional Description BHYS VCC VOUT(SAT) B+ B– V+ 0 0 VCC VS Sensor Output GND VOUT RLOAD A324x 0.1 μF CBYP Operation The output of these devices switches low (turns on) when a magnetic field (south polarity) perpendicular to the Hall sen- sor exceeds the operate point threshold, BOP. After turn-on, the output voltage is VOUT(SAT). The output transistor is capable of sinking 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, BRP, the device output goes 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 the hysteresis region, less than BOP and higher than BRP, allows an indeterminate output state. The correct state is attained after the first excursion beyond BOP or BRP. 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. 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 Unipolar 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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