ATS665 Allegro MicroSystems, Inc., ATS665 Datasheet
ATS665
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ATS665 Summary of contents
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... Under-voltage lockout Order by: ATS665LSGTN-T (Pb-free, 800 pieces/reel). (Pb-based variants are being phased out of the product line. ATS665LSGTN is in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable ...
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... Output Leakage Current Output Rise Time Output Fall Time SWITCH POINT CHARACTERISTICS Target Speed Bandwidth f-3dB Operate Point Release Point Final Version, Rev 2.0; MN; 19Dec05 Page 2 ATS665LSG OPERATING CHARACTERISTICS - 150 C over air gap, unless otherwise noted and T cc Test Conditions V Operating ...
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... Power-on speed ≤ 200 rpm Diameter 120 Thickness Tooth Width Valley Width Valley Depth Material Low carbon steel Final Version, Rev 2.0; MN; 19Dec05 Page 3 ATS665LSG 3 Start-up Running mode operation Measured from sensor face to top of AG target tooth AG < reference target (max) Duty cycle spec compliance ...
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... TRUE ZERO-SPEED GEAR TOOTH SENSOR Assembly Description: The ATS665 true zero speed gear tooth sensor is a Hall IC/magnet configuration that is fully optimized to provide digital detection of gear tooth edges. This sensor is integrally molded into a plastic body that has been optimized for size, ease of assembly, and manufacturability ...
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... Power-On State Operation: The device is guaranteed to power up in the OFF state (logic high output). Final Version, Rev 2.0; MN; 19Dec05 Page 5 ATS665LSG High over Tooth 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995, 2005 Allegro MicroSystems, Inc. ...
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... This device has accurate first electrical falling edge detection. The tables below show various start-up schemes. High over Tooth Low over Tooth Final Version, Rev 2.0; MN; 19Dec05 Page 6 ATS665LSG MECHANICAL TARGET PROFILE MAGNETIC PROFILE (High over Tooth) SENSOR OUTPUT ...
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... For EMC information, contact your Allegro representative. Internal Electronics: The ATS665 contains a self-calibrating Hall effect IC that possesses two Hall elements, a temperature compensated amplifier and offset cancellation circuitry. The IC also contains a voltage regulator that provides supply noise rejection over the operating voltage range ...
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... If induced offsets bias the absolute signal up or down, AGC and the dynamic DAC behavior work to normalize and reduce the impact of the offset on sensor performance. Final Version, Rev 2.0; MN; 19Dec05 Page 8 ATS665LSG DIFFERENTIAL ELECTRICAL SIGNAL 1000 0.25 mm 800 ...
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... TRUE ZERO-SPEED GEAR TOOTH SENSOR SENSOR OPERATION: SWITCHPOINTS Switchpoints in the ATS665 are established dynamically as a percentage of the amplitude of the normalized magnetic signal. Two DACs track the peaks of the normalized magnetic signal (see the section on Update); the switching thresholds are established at 30% and 70% of the two DAC’s values. The proximity of the thresholds near 50% ensures the most accurate and consistent switching where the signal is steepest and least affected by air gap variation ...
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... TRUE ZERO-SPEED GEAR TOOTH SENSOR The ATS665 incorporates an algorithm that continuously monitors the system and updates the switching thresholds accordingly. The switch point for each edge is determined by the previous two edges. Since variations are tracked in real time, the sensor has high immunity to target run-out and retains excellent accuracy and functionality in the presence of both run-out and transient mechanical events ...
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... Final Version, Rev 2.0; MN; 19Dec05 Page 11 ATS665LSG SENSOR/TARGET EVALUATION Position [º] ATS665LSG 60-0 TARGET MAP 1 1.5 2 Air Gap [mm] 0.94mm 1.19mm 1.44mm 1.69mm 1.94mm 2.19mm 2.44mm 2.69mm 2.94mm 3.19mm ...
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... When characterizing sensor performance over a significant air gap range, be sure to re-power the device at each air gap. This ensures that self-calibration occurs for each installation condition. See the section entitled Characteristic Data for typical duty cycle performance. Final Version, Rev 2.0; MN; 19Dec05 Page 12 ATS665LSG TARGET DESIGN • Tooth width > • ...
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... This value applies only to the voltage drop across the 665 chip protective series diode or resistor is used, the effective maximum supply voltage is increased. For example, when a standard diode with a 0.7 V drop is used: Vsmax = 9 0 10.6 V ATS665LSG Package Power De-Rating Curve Thermal Resistance = 126°C/Watt, T 30.0 28.0 26.0 24.0 22 ...
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... Vcc [V] Vsat 400 350 300 250 200 150 100 50 - 100 Temperature [°C] Final Version, Rev 2.0; MN; 19Dec05 Page 14 ATS665LSG CHARACTERISTIC DATA - 150 4 ° - - 150 2 ° ...
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... Temperature [°C] Duty Cycle 1000 RPM - 100 Temperature [°C] Final Version, Rev 2.0; MN; 19Dec05 Page 15 ATS665LSG 0.4 50 0.5 49 0.8 48 1.5 47 2.35 46 2.5 45 Air 44 gap 43 150 0.4 50 0.5 49 0.8 48 1 ...
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... TRUE ZERO-SPEED GEAR TOOTH SENSOR Final Version, Rev 2.0; MN; 19Dec05 Page 16 ATS665LSG PACKAGE DRAWING 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995, 2005 Allegro MicroSystems, Inc. ...
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... Additional Applications Information on gear tooth and other Allegro sensors can be obtained at Allegro’s web site, www.allegromicro.com Final Version, Rev 2.0; MN; 19Dec05 Page 17 ATS665LSG RELATED DOCUMENTS 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995, 2005 Allegro MicroSystems, Inc. ...