Details, datasheet, quote on part number: A671
DescriptionSelf-calibrating Tpos Gear-tooth Sensor With 9-Bit Signal Capture
CompanyAllegro Micro Systems, Inc.
DatasheetDownload A671 datasheet
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Features, Applications

Self Calibrating TPOS Gear Tooth Sensor with 9Bit Signal Capture

The ATS671LSE true zero speed gear tooth sensors are optimized Hall IC/magnet configurations packaged in a Single In Line Package (SIP) that provides a user-friendly solution for digital gear tooth sensing applications. The SIP module consists of an over-molded package, which holds together a samarium cobalt magnet, a pole piece and a true zero-speed Hall IC that has been optimized to the magnetic circuit. This package can be easily assembled and used in conjunction with gears of various shapes and sizes. The sensor incorporates a single element Hall IC that switches in response to the magnetic signal created by a ferrous target. The IC contains a sophisticated digital circuit designed to eliminate the detrimental effects of magnet and system offsets. Signal processing is used to provide zero speed performance independent of air gap and also to dynamically adapt device performance to the typical operating conditions found in automotive applications (reduced vibration sensitivity). High-resolution (9-bit) peak detecting DACs are used to set the adaptive switching thresholds of the device. Hysteresis in the thresholds reduces the negative effects of any anomalies in the magnetic signal (such as magnetic overshoot) associated with the targets used in many automotive applications. The ATS671LSE also includes a low bandwidth filter that increases the noise immunity and the signal to noise ratio of the sensor. These features result in potential improvements in both the timing accuracy and the jitter performance of the device. The ATS671LSE-LT sensor system is optimized for cam applications and is available with or without the TPOS function


Supply Voltage, VCC. 26.5 V Reverse Supply Voltage, VR. ­18 V Reverse Output Voltage, VORout. -0.5 V Continuous Output Current, IOUT. 20 mA Storage Temperature, TS. 170° C Package Power Rating, JA.SB. ~150° C/W Maximum Junction Temperature, TJmax. 170° C Maximum Junction Temperature ­ 100 Hours, TJmax. 180° C

Tight timing accuracy over temperature True zero speed operation True power on state Air gap independent switch points High vibration immunity Large operating air gaps Operation down to 3.3V Digital output representing target profile Single chip solution for high reliability Small mechanical size Optimized Hall IC magnetic system AGC and reference adjust circuit Under-voltage lockout

OPERATING CHARACTERISTICS Valid to 150C and power supply within specification unless

otherwise noted Characteristics Symbol Test Conditions Min. ELECTRICAL CHARACTERISTICS Supply Voltage Reverse Supply Voltage Supply Zener Clamp Voltage Supply Zener Current Supply Current VCC VRCC VZ IZ ICC Tj < Tjmax; pulsed Output = OFF Output = ON Operating; Tj < Tjmax IRCC = -5mA (max) V mA Limits Typ. Max. Units

POWER-ON STATE CHARACTERISTICS Power Up Time Under Voltage Lockout OUTPUT STAGE Low Output Voltage Output Current Limit Output Leakage Current Output Rise Time Output Fall Time VLOUT Ilin IOFF tr tf ISINK = 15 mA, Output = ON Output = ON, Tj < Tjmax Output = OFF, VOUT = Vcc(Max) = 10 pF, = 10 pF, µA µs tPO VUV Gear Speed < 100 RPM; Vcc> 3.3V 500 <Vcc Min uS V

115 Northeast Cutoff, Box 15036 Worcester, Massachusetts (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.

SWITCH POINT CHARACTERISTICS Tooth Speed Bandwidth Operate Point Release Point Output Polarity Smax f-3db Bop% Brp% Vout % of peak to peak referenced to tooth signal, AG < Agmax; % of peak to peak referenced to tooth signal, AG < Agmax; Over Valley Over Tooth Calibration Initial Calibration AGC Disable CI Cf Number of Rising Mechanical Edges for Accurate Edge Detection Number of Rising Mechanical Edges Required to Complete AGC Calibration 3 Edges HIGH LOW 8 KHz %

115 Northeast Cutoff, Box 15036 Worcester, Massachusetts (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.


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