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SS732_1311 Datasheet(PDF) 3 Page - SEC Electronics Inc. |
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SS732_1311 Datasheet(HTML) 3 Page - SEC Electronics Inc. |
3 / 9 page SS732 Hall Latch - High Sensitivity 3 V3.10 Nov 1, 2013 Pin Definitions and Description SOT Pin № SIP Pin № Name Type Function 1 1 VDD Supply Supply Voltage pin 2 3 OUT Output Open Drain Output pin 3 2 GND Ground Ground pin Detailed General Description The SS732 exhibits latch magnetic switching characteristics. Therefore, it requires both south and north poles to operate properly. The OUT pin of these devices switches low (turns on) when a magnetic field perpendicular to the Hall sensor ex- ceeds the operate point threshold, BOP. After turn-on, the output voltage is VDSon. Note that the device latches, that is, a south pole of sufficient strength towards the branded surface of the device turns the device on. The device re- mains on if the south pole is removed (B →0). This latching property defines the device as a magnetic memory. When the magnetic field is reduced below the release point, BRP , the OUT pin turns off (goes high). The differ- ence in the magnetic operate and release points is the hysteresis, BHYS , of the device. This built-in hysteresis pre- vents output oscillation near the switching point, and allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. The device behaves as a latch with symmetric operating and release switching points (BOP=|BRP|). This means magnetic fields with equivalent strength and opposite direction drive the output high and low. Powering-on the device in the hysteresis region (less than BOP and higher than BRP) allows an indeterminate output state. The correct state is attained after the first excursion beyond BOP or BRP . The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be latched on in the pres- ence of a sufficiently strong North pole magnetic field applied to the marked face. 0mT 0mT Output level Output level OUT = High Flux density OUT = High BOP 18Gs typ OUT = Low OUT = Low UA package - Latch characteristic BOP 18Gs typ BRP -18Gs typ BRP -18Gs typ Flux density SO package - Latch characteristic BHYS BHYS |
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