A3212LUA-T

Series:	--
Packaging:	Bulk
Part Status:	Active
Function:	Omnipolar Switch
Technology:	Hall Effect
Polarization:	Either
Sensing Range:	±6.5mT Trip, ±1mT Release
Test Condition:	-40°C ~ 150°C
Voltage - Supply:	2.5 V ~ 3.5 V
Current - Supply (Max):	2mA
Current - Output (Max):	1mA
Output Type:	Open Drain
Features:	--
Operating Temperature:	-40°C ~ 150°C (TA)
Package / Case:	3-SSIP
Supplier Device Package:	3-SIP

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A3212LUA-T Application Field and Working Principle

Magnetic Sensors - Switches (Solid State)

The Allegro A3212LUA-T is a solid state Hall-effect latching sensor IC with integrated fault detection capabilities, intended primarily for use in Magnetic Sensors - Switches. It is uniquely suitable for automotive applications such as gear position sensing and window lift operation where its Hall-effect latching function provides a definite output state in the presence (or absence) of an external field.

Working Principle

The A3212LUA-T\'s Hall-effect latching sensor works by detecting the presence and absence of an external magnetic field. When a field is detected, the output of the device is set to a “high”. When the field decreases or ceases altogether, the output switches to a “low”. There is no need for any predetermined delay in order for the switch to “set” or “reset” as is common with mechanical systems. The sensor is triggered by a minimum field strength, which can be adjusted with an external potentiometer. The A3212LUA-T\'s integrated fault detection allows for an immediate diagnosis of problems, such as an open circuit or foreign material obstructing the operation of the magnetic field. The integrated fault detection helps to maintain the system’s reliability.

Application Field

The A3212LUA-T has been designed primarily for use in applications where a reliable, latching Hall-effect magnetic sensor is required. These applications include gear position sensing in automotive applications, as well as window lift operation and automotive body control. The IC is also suitable for use as switches in low-power consumer products and industrial electromechanical replacements.In automotive applications, the A3212LUA-T\'s Hall-effect latching provides a definite output state based solely upon the presence (or absence) of an external magnetic field. In other words, the integrated fault detection and Hall-effect latching eliminate any need for manual adjustment or maintenance of the switch; providing an ideal solution for applications where the inherent reliability of an electromechanical system is desired.The A3212LUA-T is also able to detect a minimum field strength with an adjustable threshold and is able to protect itself against external influences such as vibrations and temperature. Additionally, it features an active pull-up output structure and reverse battery protection, making it suitable for use in extreme environments.

Conclusion

In conclusion, the Allegro A3212LUA-T is a versatile and reliable, latching Hall-effect magnetic sensor IC, suitable for use in a variety of different applications. The device is uniquely capable of offering extremely high system reliability, while at the same time, providing excellent protection from external influences such as temperature and vibration. Additionally, the integrated fault detection allows for an immediate diagnosis of problems, preventing the occurrence of false triggering and allowing for an optimal operation of the switch.

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