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A1229LLTTR-T Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A1229LLTTR-T Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 12 page Functional Description and Application Information Switching Behavior The output of the A1225, A1227, and A1229 devices switches low (turns on) when a magnetic field perpendicular to the Hall element 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). Notice that the device latches; that is, a south pole of sufficient strength towards the branded surface of the device turns the device on, and the device remains on with removal of the south pole. When the magnetic field is reduced below the release point, BRP, the device output goes high (turns off). The difference between the magnetic operate point and release point is the hysteresis, BHYS, of the device. This built-in hysteresis allows clean switch- ing of the output, even in the presence of external mechanical vibration and electrical noise. When the device is powered-on in the hysteresis range, less than BOP and higher than BRP, the device output goes high. The correct output state is attained after the first excursion beyond BOP or BRP. Application Information The simplest form of magnet that will operate these devices is a ring magnet, as shown in figure 2. Other methods of operation are possible. In three-wire applications the device output is connected through a pull-up resistor to the supply pin or separate battery voltage (figure 3). Switching of the output signal indicates sufficient change of the magnetic field. BHYS VCC VOUT(sat) B+ B– V+ 0 Figure 1. Output switching characteristics Figure 2. Typical magnetic target configuration using a ring magnet Figure 3. Typical 3-wire application circuit A122x VOUT GND CBYPASS CL (Optional) VPULLUP V+ RPULLUP VCC Device Output Hall Effect Latch for High Temperature Operation A1225, A1227 and A1229 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com |
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