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A1162LLETR-00-T Datasheet(PDF) 10 Page - Allegro MicroSystems |
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A1162LLETR-00-T Datasheet(HTML) 10 Page - Allegro MicroSystems |
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10 / 23 page  Programmable Precision Hall-Effect Switch with Advanced Diagnostics A1162 10 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com FUNCTIONAL DESCRIPTION Operation The output of these devices switches low (turns on) when a mag- netic field perpendicular to the Hall sensor exceeds the operate point threshold, BOP (see Figure 1). After turn-on, the output is capable of sinking 25 mA and the output voltage is VOUT(SAT). 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. Powering-on the device in the hysteresis range, less than BOP and higher than BRP, results in a HIGH output state. The correct state is attained after the first excursion beyond BOP or BRP. The output will not switch until there is a valid transition beyond BOP or BRP. Power-On Sequence and Timing The output states are only valid when the supply voltage is within the specified operating range (VCC(MIN) ≤ VCC ≤ VCC(MAX)) and the power-on time has elapsed (t > tON). Refer to Figure 2 for an illustration of the power-on sequence. Once the supply voltage is within the operational range, the output will be in the low state (power-on state), irrespective of the magnetic field. The output will remain low until the sensor is fully powered on (t > tON), at which point, the output will respond to the corresponding magnetic field presented to the sensor. V+ 0 0 B+ V CC V OUT(SAT) B HYS Figure 1: Switching Behavior of Unipolar Switches On the horizontal axis, the B+ direction indicates increasing south polarity magnetic field strength. Output Responds According to Magnetic Field Input B > BOP or B < BRP t > tON(MAX) V time time V VOUT(OFF) VCC(MIN) tON 0 0 VCC Output Undefined for VCC< VCC(MIN) VOUT(ON) Figure 2: Power-On Sequence and Timing |
Similar Part No. - A1162LLETR-00-T |
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Similar Description - A1162LLETR-00-T |
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