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3361ELH Datasheet(PDF) 7 Page - Allegro MicroSystems |
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3361ELH Datasheet(HTML) 7 Page - Allegro MicroSystems |
7 / 12 page 3361 AND 3362 2-WIRE, CHOPPER-STABILIZED, HALL-EFFECT SWITCHES www.allegromicro.com 7 FUNCTIONAL DESCRIPTION Dwg. EH-012 REG X +V HALL VOLTAGE B + — Dwg. AH-011-2 100 Ω Dwg. EH-011-2A 0.1 µF SUPPLY X 'UA' PACKAGE 0.95 V – + Chopper-Stabilized Technique. The Hall element can be considered as a resistor array similar to a Wheatstone bridge. A large portion of the offset is a result of the mismatching of these resistors. These devices use a proprietary dynamic offset cancellation technique, with an internal high-frequency clock to reduce the residual offset voltage of the Hall element that is normally caused by device overmolding, temperature dependen- cies, and thermal stress. The chopper-stabilizing technique cancels the mismatching of the resistor circuit by changing the direction of the current flowing through the Hall plate using CMOS switches and Hall voltage measurement taps, while maintaing the Hall-voltage signal that is induced by the external magnetic flux. The signal is then captured by a sample-and- hold circuit and further processed using low-offset bipolar circuitry. This technique produces devices that have an extremely stable quiescent Hall output voltage, are immune to thermal stress, and have precise recoverability after temperature cycling. This technique will also slightly degrade the device output repeatability. A relatively high sampling frequency is used in order that faster signals can be processed. More detailed descriptions of the circuit operation can be found in: Technical Paper STP 97-10, Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancellation and Technical Paper STP 99-1, Chopper-Stabilized Amplifiers With A Track-and-Hold Signal Demodulator. Operation. As shown in the output characteristic graphs, the output of the A3362 turns on when a magnetic field (south pole) perpendicular to the Hall sensor is increased above the operate point threshold (BOP). After turn on, the output will source current equal to the device operating current plus a current source (IGND(H)). When the magnetic field is decreased below the release point (BRP), the output turns off and will source current equal only to the Hall-effect sensor operating current (IGND(L)). The A3361 output is inverted and the device turns off at BOP and on at BRP. The difference in the magnetic operate and release points is the hysteresis (Bhys) of the device. The hysteresis allows clean switching of the output even in the presence of external mechanical vibration or electrical noise. Applications. It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor) between the supply and ground of the device to reduce both external noise and noise generated by the chopper- stabilization technique. Extensive applications information on magnets and Hall- effect sensors is also available in the Allegro Electronic Data Book AMS-702 or Application Note 27701 or www.allegromicro.com |
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