Preliminary Subject Change PRELIMINARY DATASHEET (subject change

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ATS645LSH
Preliminary Subject Change
PRELIMINARY DATASHEET (subject change without notice)
True Zero Speed Miniature Gear Tooth Sensor
ATS645LSH optimized Hall effect sensing integrated circuit magnet combination that provides user-friendly solution true zero-speed digital gear-tooth sensing two-wire applications. sensor consists single-shot molded plastic package that includes samarium cobalt magnet, pole piece, Hall effect that been optimized magnetic circuit. This small package easily assembled used conjunction with wide variety gear shapes sizes. integrated circuit incorporates dual element Hall effect sensor signal processing that switches response differential magnetic signals created ferrous gear teeth. circuitry contains sophisticated digital circuit eliminate magnet system offsets achieve true zero speed operation (ref U.S. Patent 5,917,320). converters used adjust device gain power allow independent switching.
Supply connection Test Ground
regulated current output configured wire applications sensor ideally suited obtaining speed duty cycle transmission application gear-tooth-based configurations.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, 26.5 Reverse Supply Voltage, Operating Temperature Range, Storage Temperature, Package Power Rating, °C/W Maximum Junction Temperature, TJmax Operation increased supply voltages with external
circuitry described Applications Information.
FEATURES
Fully optimized differential digital gear tooth sensor Single chip sensing high reliability Internal current regulator wire operation Small mechanical size length) independent switch points Digital output representing gear profile Precise duty cycle signal with temperature Large operating gaps Automatic Gain Control (AGC) Automatic Offset Adjustment circuit True zero speed operation Under-voltage lockout Wide operating voltage range Defined power-on state
ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR CHARACTERISTICS
Valid over operating temperature range Supply Voltage within specification unless otherwise noted. Characteristics Symbol Test Conditions Min. ELECTRICAL CHARACTERISTICS Supply Voltage Under Voltage Lockout
Limits Typ. Max. Units
VCC(UV)
Operating, 165°C t=20mS Pulse Mode
14.0 14.0
<Vcc 16.0 16.8
Supply Zener Clamp Voltage
Zener Pulse Current Supply Zener Resistance Supply Current ATS645LSH Supply Current ATS645LSH
Current State: IccLow High Current State: IccHigh Current State: IccLow High Current State: IccHigh Gear speed IccHigh IccLow, IccLow IccHigh,
12.0 11.8
POWER-ON STATE CHARACTERISTICS Power-On State
IccHigh
Power-On Time
OUTPUT STAGE Output Current Slew Rate
mA/µs
zener tested using pulse method designed transient protection, continuous operation destroy device. Power Time time required complete internal offset adjust. does include automatic gain control, which requires three tooth valley transitions complete therefore dependent. Revision 1.2; MHN; 07.Aug.02 Page
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR
Operating Characteristics: Valid with Reference Target unless otherwise specified
Characteristics Symbol Test Conditions Min. SWITCH POINT CHARACTERISTICS Rotation Speed Analog Signal Bandwidth
Limits Typ. Max. Units
Smax f-3db
Using Reference Target over Operating Range -3dB Point IccHigh IccLow Positive Peak referenced, AGmax IccLow IccHigh Negative Peak referenced, AGmax
Operate Point Release Point
Calibration Initial Calibration Characteristics Allowable User Induced Differential Offset Number Rising Mechanical Edges Accurate Edge Detection Edges
Output switching only; meet data sheet specifications
SWITCH POINT DETAIL
Input Differential Signal
Device Output Current
Differential Signal (not magnetic signal)
should adjustable with metal mask changes, limits improves vibration immunity. Revision 1.2; MHN; 07.Aug.02 Page
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR
Operating Characteristics: Valid only magnetic offset within Dynamic Offset Compensation Range specified above
Characteristics Symbol Test Conditions Min.
Limits Typ. Max. Units
OPERATING CHARACTERISTICS: Using Reference Target Valid Over Operating Temperature Range Operational Range OpAG OpMaxAG SigMin Duty cycle within specification Output Switching: Duty cycle Specification Wobble 0.5mm Typical value 1.5mm Valid over operating range Duty cycle within Specification Wobble 0.5mm Output Switching: Duty Cycle Specification 2.75 1000
Switching Range Duty Cycle Variation
Operating Signal Range Minimum Operating Signal
Operating dependent available magnetic field. available field target geometry materiel dependent should independently characterized. field available from reference target given reference gear parameter section datasheet order remain specification magnetic signal must larger than minimum value specified, this includes effect target wobble. Duty cycle guaranteed specification. Reference Duty Cycle Over Temperature graph typical operating characteristics section this document. Revision 1.2; MHN; 07.Aug.02 Page
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR
Reference Gear Parameters
REFERENCE GEAR DIMENSIONS (60-0) Diameter Thickness Tooth Width Valley Width Valley Depth Materiel Carbon Steel
Flux Density Position Reference Target
Flux Density (Gauss) -100 -150 -200 -250 -300
0.94mm 1.19mm 1.44mm 1.69mm 1.94mm 2.19mm 2.44mm 2.69mm 2.94mm 3.19mm 3.44mm 3.69mm
Target Description: Tooth Width: 3.25mm Diameter: 120mm Valley Width: 3.10mm Tooth Thickness: Valley Depth:
Position
Reference Target Peak Peak
[Gauss] 0.75
1.25
1.75
2.25 [mm]
2.75
3.25
3.75
Revision 1.2; MHN; 07.Aug.02 Page
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR
Typical Operating Characteristics: Duty Cycle Over Temperature
Duty Cycle Allegro MicroSystems, Inc. Standard Production 60-0 Target ATS645LSH 1000RPM
Duty Cycle
Typical Typical Typical
0.75
1.25
1.75
2.25
2.75
3.25
(mm)
Figure Duty Cycle Over Temperature with Reference Target Orientation Given Figure
ROTATION RIGHT from
Figure Sensor Orientation Direction Rotation Reference Target Duty Cycle Graph Figure
Revision 1.2; MHN; 07.Aug.02 Page
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR SENSOR DESCRIPTION
Assembly Description: ATS645LSH true zero speed gear tooth sensor Hall IC/magnet configuration that fully optimized provide digital detection gear tooth edges. This sensor integrally molded into plastic body that been optimized size, ease assembly, manufacturability. High operating temperature materials used aspects construction.
Sensing Technology: gear tooth sensor sub-assembly contains single-chip differential Hall effect sensor Samarium Cobalt magnet, flat ferrous pole piece. Hall consists Hall elements spaced apart that measure magnetic gradient created passing ferrous object. elements measure magnetic gradient convert analog voltage that then processed provide digital output signal.
Revision 1.2; MHN; 07.Aug.02 Page
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR
Transient Performance 7637-1
±5°C (Tested Allegro test facility engineering reference only) Performance Class Test Level
Pulse
Test
Inductive turn (negative) Inductive turn (positive) Capacitive/inductive coupling (neg) Capacitive/inductive coupling (pos) Reverse battery Load dumb Ignition coil disconnect Field decay (negative)
13.5V pulses pulse
Test Circuit
Ouline Dashed Line 100Ohm Pins Floating 0.1uF VEMC
Performance Class Definitions
(for transient performance performance)
functions device perform designed during after exposure. functions device perform designed during exposure; however, more them beyond specified limit tolerance. functions return automatically within normal limits after exposure removed. Memory must remain Class more functions device perform designed during exposure return automatically normal operation after exposure removed. more functions device perform designed during exposure return normal operation until exposure removed device reset simple operator" action. more functions device perform designed during after exposure cannot returned proper operation without repairing replacing device.
Transient test circuit
Power supply voltage transients, device output short circuits, caused faulty connectors, crimped wiring harnesses, service errors. prevent catastrophic failure, internal protection against over-voltage, reverse voltage, output overloads have been incorporated meet automotive volt system protection requirements DP7637/1. series-blocking diode current-limiting resistor required order survive pulse number six.
Revision 1.2; MHN; 07.Aug.02 Page
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR
ELECTROMAGNETIC COMPATIBILITY (EMC) PERFORMANCE
±5°C (Tested Allegro test facility engineering reference only)
Cell Performance 11452-3
Test severity level Frequency Band (MHz) (0.01 200) Performance Class Test Level
11452-4
Test severity level Frequency Band (MHz) 200) (200 400) Performance Class Test Level
Direct 11452-7
Test severity level Frequency Band (MHz) 200) (200 400) Performance Class Test Level
Revision 1.2; MHN; 07.Aug.02 Page
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR
MECHANICAL INFORMATION
Component Sensor Package Material Leads Lead Coating
Material Thermoset Epoxy Copper, 0.016" dia, 0.050" spacing Solder, Lead 90/10
Function Max. Temperature
Value 170°C
Temperature excursions 225°C minutes less permitted. Industry accepted soldering techniques acceptable this sub-assembly long indicated maximum temperatures each component exceeded.
DEVICE QUALIFICATION PROGRAM
Test Conditions AEC-Q100 (JA108) 150°C, 165°C AEC-Q100 (JA103) High Temperature Bake 170°C Temperature Humidity AEC-Q100 (JA101) Bias 85°C/85%RH Autoclave AEC-Q100 (JA102) Temperature Cycling Early Life Failure Rate AEC-Q100 #7(JA104) AEC-Q100 (AEC-Q100002, AEC-Q100-003) AEC-Q100 (AEC-Q100008) Test Name High Temperature Operating Life Test Length Lots Sample 1000 1008 cycles 150°C/24 -65°C +160°C, sec. transition, minute dwell Passes ±6kV 3/model/step combinations: Human Body Model Comments
Revision 1.2; MHN; 07.Aug.02 Page
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR
Functional block diagram
Vcc/Output
Hall
INTERNAL REGURATOR Auto Offset Control Offset
Track
Peak Hold
Test signals
Test
Typical Application Circuit
Ouline Dashed Line 100Ohm Pins Floating 0.1uF VSupply
Revision 1.2; MHN; 07.Aug.02 Page
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
ATS645LSH Preliminary Allegro Confidential TRUE ZERO SPEED DIFFERENTIAL PEAK DETECTOR
SENSOR PACKAGE
PACKAGE REFERENCE DIMENSIONS ONLY
Revision 1.2; MHN; 07.Aug.02 Page
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.

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