Data Sheet 27627.114a ATS640JSB TRUE ZERO-SPEED, SELF-CALIBRATING, DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR IC FOR TWO-WIRE APPLICATIONS 4 3 2 The ATS640JSB Hall-effect gear-tooth sensor IC is a peak detecting device that uses internal gain control to provide extremely stable duty cycles down to zero speed. Each device consists of a high-temperature plastic shell that holds together a samarium-cobalt pellet, a pole piece, and a true zerospeed BiCMOS differential Hall-effect 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. 1 Dwg. AH-006-3A PRELIMINARY INFORMATION I T N O ABSOLUTE MAXIMUM RATINGS at TA = 25°C L P Output OFF Voltage, VOUT ................... 26.5 V Reverse Output Current, IROUT ............ 50 mA I D E R H S 6 S AT L 5 4 D E Y B continued next page… C A Supply Voltage, VCC .......................... 26.5 V* Reverse Supply Voltage, VRCC .............. -24 V C S D E P O R This device 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. U N (subject to change without notice) August 28, 2002 U D The technology used for this device is Hall-effect based. The chip 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. Pin 1 = Supply Pin 2 = Current Output Pin 3 = No Connection Pin 4 = Ground T C Package Power Dissipation, PD .......................................... See Graph Operating Temperature Range, TA ................................ -40°C to +115°C* Storage Temperature, TS .................. +170°C Some restrictions may apply to certain types of sales. Contact factory for details. * Operation at increased supply voltages with external circuitry is described in Applications Information. Devices for operation at increased temperatures are available on special order. Always order by complete part number: ATS640JSB . ATS640JSB TRUE ZERO-SPEED, TWO-WIRE GEAR-TOOTH SENSOR IC FEATURES AND BENEFITS TYPICAL APPLICATION Vcc 1 2 NC X 3 SUPPLY Icc + Io 0.1 µF 1V – + - 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 IC 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 µs Typical Power-On Time AGC and Reference-Adjust Circuit Under-Voltage Lockout Wide Operating Voltage Range Defined Power-On State X + 4 100 Ω Dwg. EH-011-1B FUNCTIONAL BLOCK DIAGRAM 1 SUPPLY UVLO – GAIN X E1 MAGNET X + – + E2 3 INTERNAL CONNECTION CURRENT OUTPUT POWER-ON LOGIC – OUTPUT LOGIC REG 2 REFERENCE GENERATOR ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ + 4 GROUND POSITIVE PEAK ADC - DAC TRACK & HOLD NEGATIVE PEAK ADC - DAC TRACK & HOLD Dwg. FH-019 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2002 Allegro MicroSystems, Inc. ATS640JSB TRUE ZERO-SPEED, TWO-WIRE GEAR-TOOTH SENSOR IC MECHANICAL INFORMATION Component Material Package Face Thermoset epoxy Function Units 170 °C* Maximum temperature Plastic Housing Thermoplastic PBT 264 psi deflection temp. (DTUL) 66 psi deflection temp. (DTUL) Approximate melting temperature 204°C 216°C 225°C Flame Class Rating — — UL94V-0 Leads Copper — — Lead Finish 90/10 tin/lead solder plate — † Lead Pull — — 8N *Temperature excursions to 225 °C for 2 minutes or less are permitted. †All industry-accepted soldering techniques are permitted for these packages 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. Element Location (in millimeters) (element location relative to package center is the design objective) 2.235 1.1 Lead Cross Section (in millimeters) 0.48 0.36 0.41 0.1 NOM. 0.38 A NOM. Dwg. MH-018 mm www.allegromicro.com 0.44 0.35 0.0076 MIN. PLATING THICKNESS Dwg. MH-019A mm ATS640JSB TRUE ZERO-SPEED, TWO-WIRE GEAR-TOOTH SENSOR IC DIMENSIONS IN MILLIMETERS 1.27 8.8 7.0 TYP 1 2 3 7.0 4 0.41 0.38 3.9 3.0 NOM A 0.9 DIA 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. The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. 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 performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. 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 that may result from its use. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000