A1469

A1469 Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration FEATURES AND BENEFITS Unique design for robustness against high-power EMC transients Peak detection based switching algorithm for large operating air gaps Minimum differential field 20 Gpk-pk Running mode calibration for continuous optimization Precise duty cycle signal throughout operating temperature range Automatic Gain Control (AGC) for air-gap–independent switchpoints Automatic Offset Adjustment (AOA) for signal processing optimization True zero-speed operation Scan and IDDQ for increased test coverage PACKAGE: 4-pin SIP (suffix K) Not to scale DESCRIPTION TheA1469 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 combination of offset and gain...