APS1006 Datasheet | APSemi

Features and Benefits - 4.0 to 26.5 V supply operating range - Minimum differential field 20 Gpk-pk - Running mode calibration for continuous optimization - Single chip IC for high reliability - Precise duty cycle signal throughout operating temperature range - Large operating air gaps - Automatic Gain Control (AGC) for air-gap- independent switchpoints - Automatic Offset Adjustment (AOA) for signal processing optimization - True zero-speed operation - Undervoltage lockout - Reverse battery protection - Scan and IDDQ for increased test coverage Description The A1468 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 easily assembled 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 ringmagnet 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 bination 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 A1468 is available in a 4-pin SIP (suffix K). The package is lead (Pb) free, with 100% matte tin leadframe plating. Package: 4-pin SIP (suffix K) Not to scale Functional Block Diagram E1 Hall Amplifier ∑ Gain Intern...