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A1125EUA-T Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A1125EUA-T Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 13 page Chopper Stabilized Precision Hall Effect Switches A1120, A1121 and A1125 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com CBYP A112x VOUT GND 0.1 μF VCC Output RL VS Operation The output of the A1120 and A1121 devices switches low (turns on) when a magnetic field perpendicular to the Hall element exceeds the operate point threshold, BOP (see panel A of figure 1). When the magnetic field is reduced below the release point, BRP, the device output goes high (turns off). The output of the A1125 devices switches high (turns off) when a magnetic field perpendicular to the Hall element exceeds the operate point threshold, BOP (see panel B of figure 1). When the magnetic field is reduced below the release point, BRP, the device output goes low (turns on). After turn-on, the output voltage is VOUT(SAT). The output tran- sistor is capable of sinking current up to the short circuit current limit, IOM, which is a minimum of 30 mA. 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 range (less than BOP and higher than BRP) will give 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 element) between the supply and ground of the device to reduce external noise in the application. As is shown in panel B of figure 1, a 0.1 μF capacitor is typical. Extensive applications information for Hall effect devicers is available in: • Hall-Effect IC Applications Guide, Application Note 27701 • Guidelines for Designing Subassemblies Using Hall-Effect Devices, Application Note 27703.1 • Soldering Methods for Allegro’s Products – SMT and Through- Hole, Application Note 26009 All are provided in Allegro Electronic Data Book, AMS-702, and the Allegro Web site, www.allegromicro.com. Figure 1. Device switching behavior. In panels A and B, on the horizontal axis, the B+ direction indicates increasing south polarity magnetic field strength. This behavior can be exhibited when using an electrical circuit such as that shown in panel C. (A) (B) (C) Functional Description BHYS VCC VOUT(SAT) B+ V+ 0 0 BHYS VCC VOUT(SAT) B+ V+ 0 0 |
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