A3280LLT-T

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A3280LLT-T Application Field and Working Principle

The A3280LLT-T is a Magnetic Sensor-Switch (Solid State) from Allegro MicroSystems, Inc. It is designed to detect the presence of a magnetic field and provide a digital output to indicate its presence. The A3280LLT-T is suitable for many applications where reliably detecting the presence of a permanent magnet or a relatively high intensity magnetic field is required. The A3280LLT-T is small, robust, and consumes only a very small amount of current.

Applications and Characteristics

The A3280LLT-T is specifically designed for automotive applications and other applications where reliable and accurate sensing of the presence of a magnetic field is required. With its contactless design it is suitable for use in harsh environments and in applications where the device needs to be easily installed and removed. The latching feature of the A3280LLT-T makes it suitable for applications such as power windows, hazard flashers, central door locks, and alarm systems. It is also suitable for HVAC applications such as air conditioners, heat pumps, and room thermostats. Its small size, low power consumption, and high reliability make it a great choice for a number of different applications.

The device has a built-in Hall effect transducer and a built-in Schmitt trigger buffer which provide a digital output signal that is proportional to the strength and polarity of the applied magnetic field. The output is compatible with digital logic circuits and is available in both pull-up and pull-down versions. The device features hysteresis and is available in both latching and non-latching versions. It is available in a SOT23-5 package for easy assembly and installation.

Working Principle

The A3280LLT-T operates on the principle of a Hall effect transducer. This transducer is sensitive to changes in a magnetic field. These changes in a magnetic field cause the transducer to move or vibrate, resulting in a voltage that is proportional to the strength and direction of the field. This voltage is then amplified and filtered to produce a digital output signal. The device features hysteresis and is available in both latching and non-latching versions.

The magnetic field is detected by the Hall probe, which consists of four thin metal plates. The plates are layered perpendicular to each other and connected to a very low value resistor, as shown in the diagram. When a changing magnetic field is present, it generates a voltage across the plate. This voltage is proportional to the strength and direction of the magnetic field and is amplified by the amplifier circuit in the A3280LLT-T. The output of the amplifier is filtered to produce a digital output signal.

The A3280LLT-T is designed for reliable detection of the presence of a relatively high intensity magnetic field and for switching applications. The device also features a built-in Schmitt trigger buffer which can be used to reduce the effects of voltage noise and ensure glitch-free operation. The output of the device is digital, so it is compatible with digital logic circuits and requires no extra components. The device is available in a SOT23-5 package for easy assembly and installation.

Conclusion

The A3280LLT- T Magnetic Sensor-Switch (Solid State) from Allegro MicroSystems, Inc. is an ideal solution for applications such as power windows, hazard flashers, central door locks, and alarm systems. It can also be used in HVAC applications such as air conditioners, heat pumps, and room thermostats. The device is small, robust, and consumes only a very small amount of current. It is designed for reliable detection of the presence of a relatively high intensity magnetic field and for switching applications. The device is accurate, reliable, and easy to install in any desired application.

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