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A3421LKA Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A3421LKA Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 12 page The A3421xKA and A3422xKA Hall-effect, direction-detection sensors are a new generation of special-function integrated sensors that are capable of sensing the direction of rotation of a ring magnet. These transducers provide separate digital outputs that provide information on magnet rotation speed, direction, and magnet pole count. These devices eliminate the major manufacturing hurdles encountered in fine-pitch direction-detection applications, namely maintaining accurate mechani- cal location between the two active Hall elements. Here, the two Hall elements are photolithographically aligned to better than 1 µm, as contrasted with 100 µm or worse mechanical location tolerance when manufactured discretely. These highly sensitive, temperature-stable, magnetic transducers are ideal for use in digital-encoder systems in the harsh environments of automotive or industrial applications. The A3421xKA is a high-hysteresis device designed for low-resolution pulse counting while the A3422xKA is a high-sensitivity device optimized for use with high-density magnets. The A3421xKA and A3422xKA monolithic integrated circuits contain two independent Hall-effect latches whose digital outputs are internally coupled to CMOS logic circuitry that decodes signal speed and direction. Extremely low-drift BiCMOS circuitry is used for the amplifiers to ensure symmetry between the two latches so that signal quadrature can be maintained. An on-chip voltage regulator allows the use of these devices from a 4.5 V to 18 V supply. Both devices have standard open-collector outputs; the logic operation of both devices is the same. Two operating temperature ranges are provided; suffix ‘E–’ is for the automotive and industrial temperature range of -40 °C to +85°C, suffix ‘L–’ is for the automotive and military temperature range of -40 °C to +150°C. The 5-pin ‘KA’ SIP package provides a cost-com- petitive solution to linear magnetic sensing in harsh environments. FEATURES I Internal Direction-Decoding Circuitry I Two Matched Hall Latches On A Single Substrate I Superior Temperature Stability I 4.5 V to 18 V Operation Electrically Defined Power-On State Under-Voltage Lockout HALL-EFFECT, DIRECTION-DETECTION SENSORS Always order by complete part number, e.g., A3421EKA . X V CC 1 4 3 2 5 Dwg. PH-015 LOGIC X E1 E2 Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC . . . . . . . . . . . . . 18 V Magnetic Flux Density, B . . . . Unlimited Output OFF Voltage, VOUT . . . . . . . . VCC Output Sink Current, IOUT . . . . . . . 30 mA Package Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . 500 mW Operating Temperature Range, TA Suffix ‘EKA’ . . . . . . . -40˚C to +85˚C Suffix ‘LKA’ . . . . . . -40˚C to +150˚C Storage Temperature Range, TS . . . . . . . . . . . . . . . -65˚C to +170˚C 3421 AND 3422 PRELIMINARY INFORMATION (subject to change without notice) September 6, 2000 |
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