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A1569ELJTR-T Datasheet(PDF) 11 Page - Allegro MicroSystems |
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A1569ELJTR-T Datasheet(HTML) 11 Page - Allegro MicroSystems |
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11 / 21 page  LED Driver with Integrated Hall-Effect Switch A1569E 11 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Function Truth Table EXT SEN_EN Magnetic Field B LED 0 0 X OFF 0 1 B > BOP OFF 0 1 B < BRP ON 1 X X ON Example Function Diagrams B > B OP B < B RP High High Max Low Low 0 mA Fade in Fade out B FIELD I LED SEN_EN EXT Figure 3: Hall-Activated Operation With EXT low and SEN_EN high, the switching of the LED is controlled by the BFIELD as detected by the Hall sensor. B > B OP B < B RP High High Max Low Low 0 mA B FIELD I LED SEN_EN EXT Figure 4: Disabling the Hall Sensor with SEN_EN The Hall sensor can be disabled by driving SEN_EN low. This will force the LED off even if the BFIELD is below BOP. |
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