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A1222 Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A1222 Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 13 page Chopper Stabilized Precision Hall Effect Latches A1220, A1221 and A1222 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com CBYP A122x VOUT GND 0.1 μF VCC Output RL VS Operation The output of these devices switches low (turns on) when a mag- netic field perpendicular to the Hall element exceeds the operate point threshold, BOP (see panel A of figure 1). 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. Removal of the magnetic field will leave the device output latched on if the last crossed switchpoint is BOP, or latched off if the last crossed switch point is BRP. Powering-on the device in the hysteresis range (less than BOP and higher than BRP) will give an indeterminate output state. The cor- rect 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 both external noise and noise generated by the chopper stabilization technique. As is shown in panel B of figure 1, a 0.1 μF capacitor is typical. Extensive applications information for Hall effect devices 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. Switching behavior of latches. 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) Functional Description BHYS VCC VOUT(SAT) B+ B– V+ 0 0 |
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