A1642

A1642 Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor IC with Continuous Calibration FEATURES AND BENEFITS ▪ Running mode calibration for continuous optimization ▪ Single chip IC for high reliability ▪ Internal current regulator for 2-wire operation ▪ Precise duty cycle signal over operating temperature range ▪ Large operating air gaps ▪ Automatic Gain Control (AGC) for air gap independent switch points ▪ Automatic Offset Adjustment (AOA) for signal processing optimization ▪ True zero-speed operation ▪ Undervoltage lockout ▪ Wide operating voltage range ▪ Wide-lead package suitable for welding external components directly to the package leads or for welding the device to a leadframe. PACKAGE: 4-pin SIP (Suffix KN) Not to scale DESCRIPTION The A1642 is an optimized Hall-effect sensing integrated circuit that provides a user-friendly solution for true zero-speed digital ring-magnet sensing in two-wire applications. This small package can be easily assembled and used in conjunction with a wide variety of target shapes and sizes. The integrated circuit incorporates dual Hall-effect elements 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 air-gap–independent switch points, and to achieve true zero-speed operation. Signal optimization occurs at power-on through the combination of offset and ...