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A1205 Datasheet(PDF) 7 Page - Allegro MicroSystems |
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A1205 Datasheet(HTML) 7 Page - Allegro MicroSystems |
7 / 12 page Continuous-Time Bipolar Switch A1205 7 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Functional Description Bipolar Device Switching The devices of the A120X family provide highly sensitive switching for applications using magnetic fields of alternating polarities, such as ring magnets. There are three switching modes for bipolar devices, referred to as latch, unipolar switch, and negative switch. Mode is determined by the switchpoint charac- teristics of the individual device. The characteristic hysteresis, BHYS, of the device, is the difference in the relative magnetic strengthandpolarityoftheswitchpointsofthedevice.(Note that, in the following descriptions, a negative magnetic value indicates a north polarity field, and a positive magnetic value indicates a south polarity field. For a given value of magnetic strength, BX, the values –BX and BX indicate two fields of equal strength, but opposite polarity. B = 0 indicates the absence of a magneticfield.) Bipolardevicestypicallybehaveaslatches.Inthismode, magnetic fields of opposite polarity and equivalent strengths areneededtoswitchtheoutput.Whenthemagneticfieldsare removed(B→0)thedeviceremainsinthesamestateuntila magnetic field of the opposite polarity and of sufficient strength causes it to switch. The hysteresis of latch mode behavior is shown in panel A of figure 1. Incontrasttolatching,whenadeviceexhibitsunipolarswitch- ing, it only responds to a south magnetic field. The field must be of sufficient strength, > BOP,forthedevicetooperate.When the field is reduced beyond the BRP level, the device switches back to the high state, as shown in panel B of figure 1. Devices exhibiting negative switch behavior operate in a similar but opposite manner. A north polarity field of sufficient strength, > BRP,(morenorththanBRP)isrequiredforoperation,although the result is that VOUTswitcheshigh,asshowninpanelC.When Figure 1. Bipolar Device Output Switching Modes. These behaviors can be exhibited when using a circuit such as that shown in panel D. Panel A displays the hysteresis when a device exhibits latch mode (note that the BHYS band incorporates B= 0), panel B shows unipolar switch behavior (the BHYS band is more positive than B = 0), and panel C shows negative switch behavior (the BHYS band is more negative than B = 0). Bipolar devices, such as the 120x family, can operate in any of the three modes. BHYS VOUT(SAT) V+ 0 BHYS VOUT(SAT) V+ 0 BHYS VOUT(SAT) V+ 0 VCC VCC VCC B+ B– B+ B– 0 0 B+ B– 0 (A) (B) (C) VCC VS Sensor Output GND VOUT RL A120x (D) |
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