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| ATS640JSB TRUE ZERO-SPEED, TWO-WIRE GEAR-TOOTH SENSOR ATS640JSB The ATS640JSB Hall-effect gear-tooth sensor is a peak detecting device that uses internal gain control to provide extremely stable duty cycles down to zero speed. Each sensor subassembly consists of a high-temperature plastic shell that holds together a samarium-cobalt magnet, a pole piece, and a true zero-speed BiCMOS differential Halleffect gear-tooth sensor IC that has been optimized to the magnetic circuit. This small package can be easily assembled and used in conjunction with a wide variety of gear shapes and sizes. The gear-sensing technology used for this sensor subassembly is Hall-effect based. The sensor incorporates a dual-element Hall IC that switches in response to differential magnetic signals created by a ferrous target. The sophisticated self-calibrating digital-processing circuitry normalizes the internal gain of the device to minimize the effect of air gap variations. and to reduce vibration sensitivity. The circuit eliminates magnet and system offsets such as those caused by tilt yet provides zero-speed detection capabilities without the associated running jitter inherent in classical digital solutions. This sensor system is ideal for use in gathering speed, position, and timing information using gear-tooth-based configurations. The ATS640JSB is particularly suited to those applications that require extremely accurate duty cycle control or accurate edge detection. The lower vibration sensitivity also makes this device extremely useful for transmission speed sensing. Data Sheet 27627.114 TRUE ZERO-SPEED, SELF-CALIBRATING, DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR FOR TWO-WIRE APPLICATIONS 1 2 3 4 Pin 1 = Supply Pin 2 = Current Output Pin 3 = Internal Connection Pin 4 = Ground Dwg. AH-006-3 ADVANCE INFORMATION (subject to change without notice) November 20, 1998 ABSOLUTE MAXIMUM RATINGS at TA = 25C Supply Voltage, VCC .......................... 26.5 V* Reverse Supply Voltage, VRCC .............. -24 V Output OFF Voltage, VOUT ................... 26.5 V Reverse Output Current, IROUT ............ 50 mA Package Power Dissipation, PD .......................................... See Graph Operating Temperature Range, TA ................................ -40C to +115C* Storage Temperature, TS .................. +170C * Operation at increased supply voltages with external circuitry is described in Applications Information. Devices for operation at increased temperatures are available on special order. continued next page... Always order by complete part number: ATS640JSB . ATS640JSB TRUE ZERO-SPEED, TWO-WIRE GEAR-TOOTH SENSOR FEATURES AND BENEFITS s s s s s s s s s s s s s s s s s Internal Current Regulator for 2-Wire Operation True Zero-Speed Operation Self Calibrating Extremely Stable Duty Cycle with Temperature Fully Optimized Differential Digital Gear-Tooth Sensor Large Operating Air Gaps Air-Gap Independent Switch Points High Vibration Immunity Single-Chip Sensing IC for High Reliability Digital Output Representing Target Profile Small Mechanical Size Optimized Magnetic Circuit <200 s Typical Power-On Time AGC and Reference-Adjust Circuit Under-Voltage Lockout Wide Operating Voltage Range Defined Power-On State TYPICAL APPLICATION Vcc 1 FUNCTIONAL BLOCK DIAGRAM 1 SUPPLY 2 CURRENT OUTPUT X NC 2 0.1 F 3 SUPPLY Icc + Io X + - 4 100 Dwg. EH-011-1 REG UVLO POWER-ON LOGIC - GAIN X MAGNET E1 - + REFERENCE GENERATOR - + OUTPUT LOGIC + 4 GROUND X E2 POSITIVE PEAK ADC - DAC TRACK & HOLD NEGATIVE PEAK ADC - DAC TRACK & HOLD Dwg. FH-019 3 INTERNAL CONNECTION 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1998, Allegro MicroSystems, Inc. ATS640JSB TRUE ZERO-SPEED, TWO-WIRE GEAR-TOOTH SENSOR MECHANICAL INFORMATION Component Sensor Face Plastic Housing Material Thermoset epoxy Thermoplastic PBT Function Maximum temperature 264 psi deflection temp. (DTUL) 66 psi deflection temp. (DTUL) Approximate melting temperature -- -- -- -- Units 170C* 204C 216C 225C UL94V-0 -- 8N Flame Class Rating Leads Lead Finish Lead Pull -- Copper 90/10 tin/lead solder plate -- *Temperature excursions to 225 C for 2 minutes or less are permitted. All industry-accepted soldering techniques are permitted for these subassemblies provided the indicated maximum temperature for each component (e.g., sensor face, plastic housing) is not exceeded. Reasonable dwell times, which do not cause melting of the plastic housing, should be used. Sensor Location (in millimeters) (sensor location relative to package center is the design objective) Lead Cross Section (in millimeters) 2.235 1.1 0.41 0.1 0.38 A Dwg. MH-018 mm 0.0076 MIN. PLATING THICKNESS Dwg. MH-019 mm ATS640JSB TRUE ZERO-SPEED, TWO-WIRE GEAR-TOOTH SENSOR DIMENSIONS IN MILLIMETERS 1.27 TYP 8.8 7.0 3 4 0.41 7.0 1 0.38 2 3.9 3.0 NOM 0.9 DIA A 8.09 2.0 8.96 Dwg. MH-017-1B mm Tolerances, unless otherwise specified: 1 place 0.1 mm, 2 places 0.05 mm. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 |
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