A1642LKNTN-I2-T Allegro

A1642 Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor IC with Continuous Calibration FEATURES AND BENEFITS DESCRIPTION Running mode calibration for continuous optimization The A1642 is an optimized Hall-effect sensing integrated Single chip IC for high reliability circuit that provides a user-friendly solution for true zero-speed Internal current regulator for 2-wire operation digital ring-magnet sensing in two-wire applications. This small Precise duty cycle signal over operating temperature range package can be easily assembled and used in conjunction with Large operating air gaps a wide variety of target shapes and sizes. Automatic Gain Control (AGC) for air gap independent The integrated circuit incorporates dual Hall-effect elements switchpoints and signal processing that switches in response to differential Automatic Offset Adjustment (AOA) for signal processing magnetic signals created by ring magnet poles. The circuitry optimization contains a sophisticated digital circuit to reduce system offsets, True zero-speed operation to calibrate the gain for air-gapindependent switchpoints, Undervoltage lockout and to achieve true zero-speed operation. Signal optimization Wide operating voltage range occurs at power-on through the combination of offset and Wide-lead package suitable for welding external gain adjust and is maintained throughout the operating time components directly to the package leads or for welding with the use of a running-mode calibration. The running-mode the device to a leadframe. calibration allows immunity to environmental effects such as micro-oscillations of the target or sudden air gap changes. PACKAGE: The regulated current output is configured for two-wire 4-pin SIP applications and the A1642 is ideally suited for obtaining (Suffix KN) speed and duty cycle information in ABS (antilock braking systems). The 1.5 mm spacing between the dual Hall elements is optimized for fine pitch ring-magnetbased configurations. For applications requiring sensing of rotating ferrous gears and targets, refer to the Allegro ATS series of products. The package Not to scale is lead (Pb) free, with 100% matte-tin leadframe plating. Functional Block Diagram Hall VCC Gain Amplifier Automatic Offset AOA DAC AGC DAC Internal Regulator Control Gain Control Tracking Peak Hold DAC GND Test Test Signals A1642LKN-DS, Rev. 5 November 16, 2016Two-Wire True Zero-Speed Miniature Differential A1642 Peak-Detecting Sensor IC with Continuous Calibration SELECTION GUIDE Part Number I Range Packing* CC A1642LKNTN-I1-T 4.0 mA Low to 16.0 mA High Tape and reel, 13-inch reel 4000 pieces per reel A1642LKNTN-I2-T 5.9 mA Low to 16.8 mA High *Contact Allegro for additional packing options ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Units Supply Voltage V 28 V CC Reverse Supply Voltage V 18 V RCC Operating Ambient Temperature T Range L 40 to 150 C A Maximum Junction Temperature T (max) 165 C J Storage Temperature T 65 to 170 C stg PINOUT DIAGRAM TERMINAL LIST TABLE Number Name Function 1 VCC Connects power supply to chip 2 NC No connection 1 2 3 4 3 Test Float or tie to GND 4 GND Ground connection Allegro MicroSystems, LLC 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com