The A1469 is an optimized Hall effect sensing IC that provides a user-friendly solution for digital ring-magnet sensing, or when coupled with a magnet, ferromagnetic target sensing, in three-wire applications. The small device package can be assembled simply into applications for use in conjunction with a wide variety of target shapes and sizes.
The integrated circuit incorporates dual Hall effect elements with a 2.2 mm spacing and signal processing that switches in response to differential magnetic signals created by ring-magnet poles. The circuitry contains a sophisticated digital circuit to reduce system offsets, to calibrate the gain for airgap-independent switchpoints, and to achieve true zero-speed operation. Signal optimization occurs at power-on through the combination of offset and gain adjust, and is maintained throughout the operating time with the use of a running-mode calibration. The running-mode calibration provides immunity to environmental effects such as micro-oscillations of the target or sudden air gap changes.
The device is ideally suited to obtaining speed and duty cycle information in ring-magnet–based speed, position, and timing applications, such as in speedometers.
The A1469 is available in a 4-pin SIP (suffix K) package. The package is lead (Pb) free, with 100% matte tin leadframe plating.
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.
This document covers most of the assembly methods used for mounting Hall-effect devices. In Allegro® Hall-effect devices, the signal is conditioned and optimized for various types of magnetic inputs to produce a suitable electrical output.Learn More
AN296080 - This application note provides specific information and general ideas to consider when designing tools to accomplish the final preparation of the device. The application note Guidelines for Designing Subassemblies Using Hall-Effect Devices, AN27703, must be used in conjunction with this ...Learn More