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A1126 Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A1126 Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 14 page Chopper Stabilized Omnipolar Hall-Effect Switch A1126 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Functional Description The output of these devices switches low (turns on) when a magnetic field perpendicular to the Hall sensor chip exceeds the operate point threshold, BOPx. 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, BRPx, the device output goes high (turns off). The differ- ence in the magnetic operate and release points is the hysteresis, BHYS, of the device. This built-in hysteresis allows clean switch- ing of the output even in the presence of external mechanical vibration and electrical noise. In the case of omnipolar switch devices, removal of the magnetic field results in the device output high (off). Powering-on the device in the hysteresis range (less than BOPx and greater than BRPx) will allow an indeterminate output state. The correct state is attained after the first excursion beyond BOPx or BRPx. Figure 1. Switching behavior of omnipolar switches. On the horizontal axis, the B+ direction indicates increasing south polarity magnetic field strength, and the B– direction indicates increasing north polarity. This behavior can be exhibited when using a circuit such as that shown in figure 2. BHYS BHYS VS VOUT(SAT) B+ B– V+ 0 0 |
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