The A1684LUB is an optimized Hall-effect sensing integrated circuit that provides a user-friendly solution for true zero-speed digital ring magnet and—when magnetically back-biased—gear tooth sensing in two-wire applications. The Hall-effect IC has been optimized for the automotive environment. This small package can be used in conjunction with a wide variety of target shapes and sizes.
The single integrated circuit incorporates a dual element Hall effect sensor IC and signal processing circuitry that switches in response to differential magnetic signals created by a ring magnet, or by a rotating ferromagnetic target when used in combination with a back-biasing magnet. The device contains a sophisticated compensating circuit to eliminate magnetic and system offsets. Digital tracking of the analog signal is used to achieve true zero-speed operation. Advanced calibration algorithms are used to adjust the device gain and offset at power-up, resulting in air gap independent switchpoints, which greatly improves output accuracy. In addition, advanced running mode calibration circuits mitigate the effect of system anomalies such as target vibration and sudden changes in air gap.
The regulated current output is configured for two-wire operation. When configured with a back-biasing magnet, this sensor IC is ideal for obtaining edge and duty cycle information in gear-tooth–based applications such as transmission speed.
The A1684 is provided in a 2-pin miniature SIP package (suffix UB) that is lead (Pb) free, with 100% matte tin leadframe plating.
Seth Prentice, Strategic Marketing Manager for Allegro MicroSystems Speed Sensor IC group, discusses IC solutions for designing speed sensing applications including automotive transmissions, washing machine drum speeds, and fork lift positioning requiring reliable consistent output signals. Watch Video
Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.
Allegro MicroSystems uses the latest integrated circuit technology in combination with the century-old Hall effect to produce Hall-effect ICs. These are contactless, magnetically activated switches and sensor ICs with the potential to simplify and improve electrical and mechanical systems. what is ...Learn More
As technology improves, Hall-effect sensor ICs are finding their way into many modern household appliances. The Hall effect refers to the measurable voltage that appears across a conductive material, for example silicon (Si), when an electric current flowing through the conductor is influenced by a ...Learn More
The ever-evolving requirements of the automotive, industrial, and commercial markets for increased reliability and functionality will continue to drive demand for electronic content, including non-contact magnetic sensor ICs with diagnostics.Learn More
This document describes typical soldering methods that have been proven effective with Allegro™ products. It provides information on SMD (surface mount devices) and through-hole packages. Both lead (Pb) free and traditional Pb-based technologies are examined.Learn More
In addition to advancements made in Hall sensor IC technology over the last decade, Allegro™ MicroSystems has also produced significant packaging advancements in back-biased devices. Magnetic circuit elements and the use of high temperature materials have resulted in lower total system costs for ...Learn More
The Hall effect, discovered by E. H. Hall in 1879, is the basis for all Hall-effect devices. When this physical effect is combined with modern integrated circuit (IC) technology, many useful magnetic sensing products are possible. The Hall element, when properly biased, produces an output voltage ...Learn More
One of the common causes of damage to the Allegro™ Hall-effect devices that are magnetically back-biased is from the various leadforming operations performed to prepare the device for final assembly. This application note provides specific information and general ideas to consider when designing ...Learn More