Description
ATS672LSB Preliminary – Subject to Change PIN OUT DIAGRAM Self-Calibrating TPO Gear-Tooth Sensor with 9-Bit Signal Capture The ATS672LSB true zero-speed gear-tooth sensors are optimized Hall IC/magnet configurations packaged in a single inline 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 small 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 magnetic signals 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). Highresolution (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). The ATS672LSB 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 ATS672LSB sensor system is optimized for cam applications. Four versions of this device are available. The sensor can be chosen to have a high or low output signal in response to a “tooth”. The sensor is also available with and without TPOS (true power on state) capability. The low-on-tooth sensor without TPOS is available through general sales. (Part # ATS672LSB-LN). For other versions please contact the factory. Some restrictions may apply. www.DataSheet4U.com 4321 Pin 1: VCC Pin 2: VOUT Pin 3: Test Pin (Tie to GND) Pin 4: Gnd ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . 28 V Reverse Supply Voltage, VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . –18 V Reverse Current Through Output, IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Continuous Output Current, IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Storage Temperature, TS . . . . . . . . . . . . . . . . . . . . . . . . . . . 170° C Package Power Rating, RθJA. . . . . . . . . . . . . . . . . . . ~150°C/W Maximum Junction Temperature, TJmax . . . . . . . . . . . . . . . . . . . . . . . . . 170° C Maximum Junction Temperature – 100 Hours, TJmax . . . . . . . . . . . . . . . . . . . . . . . . . 180° C FEATURES Tight timing accuracy over temperature True zero-speed operation True power-on sensing Air gap independent switch points High vibration immunity Large operating air gaps Operation down to 3.3 V Digital output representing target profile Single-chip solution for high reliability Small mechanical size Optimized Hall IC magnetic system AGC and reference-adjust circuit Undervoltage lockout ATS672LSB SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE Preliminary – Subject to Change OPERATING CHARACTERISTICS Valid at TA = -40°C to +150°C and power supply within specification unless otherwise noted Characteristics Symbol Test Conditions Limits Min. 3.3 28 Tj < Tjmax; pulsed Output = off Output = on Gear Speed < 100 rpm; Vcc> 3.3 V 3.0 3.0 IOUT = 15 mA, Output = on Output = ON, Tj < Tjmax Output = off, VOUT = Vcc(Max) RL = 500 Ω, CL = 10 pF, TA = 25°C RL = 500 Ω, CL = 10 pF, TA = 25°C 25 0.9 0.5 0.2 45 6.5 6.5 33 Typ. Max. 26.5 -18 37 100 11 11 500 <VccMin 0.45 70 10 5.0 5.0 Units V V V mA mA mA µs V V mA µA µs µs ELECTRICAL CHARACTERISTICS Supply Voltage Reverse Supply Voltage Supply Zener Clamp Voltage Supply Zener Current Supply Current VCC VRCC VZ IZ ICC Operating; TJ < TJmax IRCC = -5 mA (max) 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 VOUT Ilin IOFF tr tf tPO VUV Rise and Fall Time Output High 90% 90% 100% 10% 10% tr tf Output Low Time [Seconds] Rev. 1.2 May 1, 2002 Page 2 of 12 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. ATS672LSB SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE Preliminary – Subject to Change Characteristics Symbol Test Conditions Limits Min. 0 40 Typ. Max. 8.0 Units kHz kHz % % SWITCH POINT CHARACTERISTICS Tooth Speed Bandwidth Operate Point Release Point Smax f-3db Bop% Brp% % of peak to peak referenced to tooth signal, AG < Agmax; % of peak to peak referenced to tooth signal, AG < Agmax; Over valley Over tooth Over valley Over tooth +30 +40 HIGH LOW LOW HIGH Output Polarity ATS672LSB-LN (no TPOS) VOUT ATS672LSB-LT (with TPOS)* Output Polarity ATS672LSB-HN (no TPOS)* VOUT ATS672LSB-HT (with TPOS)* * Restrictions on availability may apply. 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 3 Edges Edges Switchpoints Tooth Signal Bop% Brp% Bop% Brp% Valley Signal 100% Rev. 1.2 May 1, 2002 Page 3 of 12 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. ATS672LSB SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE Preliminary – Subject to Change OPERATION WITH 8X Reference Target over Operational Air Gap and Temperature with Test Circuit #1 Unless Otherwise Stated Limits Characteristics Symbol Test Conditions Min. Typ. Max. Units Rising and falling edge, RPM = 1000 3.0 6.0 ° tICRel during initial calibration gear eccentricity < 0.1 mm Rising mechanical edge 1 Relative Timing Accuracy tRel after initial calibration, RPM = 1000 0.3 0.6 ° gear eccentricity < 0.1 mm Falling mechanical edge tRel 0.5 0.8 ° after initial calibration, RPM = 1000 gear eccentricity < 0.1 mm Rising mechanical edge tAbsRise -0.2 ° air gap: 1.5mm, temperature: 25°C RPM: 1000 2 Absolute Timing Accuracy Falling mechanical edge tAbsFall +0.6 ° air gap: 1.5mm, temperature: 25°C RPM: 1000 x 10-5° After initial calibration 3 6.66 Phase Delay tRelSpeed air gap: 1.5 mm, temperature: 25°C / RPM 4 Valleys may be detected as teeth: TPOS Air Gap Min 0.5 mm AGMin incorrect TPOS ATS672LSB – LT and HT TPOS Air Gap Range ATS672LSB – LT and HT TPOS Air Gap Max ATS672LSB – LT and HT Operational Air Gap Range Edge Repeatability 6 5 AGTPOS AGMax AG tθE Distance for correct TPOS functionality Teeth may be detected as a valley: incorrect TPOS Output switching: running mode only 360° repeatability, 1000 edges 0.5 2.25 0.5 0.04 2.25 5.0 2.25 mm mm mm ° 1 Relative Timing Accuracy Range is the change in edge position over the operational air gap and temperature range that can be expected from a single device. This does not include part-to-part variation. 2 The Typical Absolute Timing Accuracy is the difference between the target mechanical edge (rising or falling) and the corresponding sensor electrical edge. Phase Delay is the change in edge position over the operational RPM range that can be expected from a single device. This does not include part-to-part variation or variation due to temperature. 4 3 The TPOS Air Gap Min is the Installation Air Gap where the device may detect Valleys as Teeth. The True Power On Function is NOT guaranteed to operate. The TPOS Air Gap Range is the Installation Air Gap Range where the True Power On Function is guaranteed to operate. Operating is defined as correctly detecting a tooth when powered up over a tooth and correctly detecting a valley when powered up over a valley using the Reference Target. This specification is only valid for targets that meet or exceed the ‘Gear Parameters for Correct TPOS Operation’ section of this document. 5 The TPOS Air Gap Max is the Installation Air Gap where the device may detect a Tooth as a Valley. The True Power On Function is NOT guaranteed to operate. Rev. 1.2 May 1, 2002 Page 4 of 12 6 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. ATS672LSB SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE Preliminary – Subject to Change Relative Timing Accuracy Target Absolute Timing Accuracy Target TAbsRise TAbsFall Device Output Device Output TAbsRise (Max - Min) TAbsFall (Max - Min) TAbsFall (Max - Min) Operational Air Gap Valley Tooth Air Gap TPOS Air Gap Valley Tooth TPOS Air Gap TPOS Air Gap Range Min TPOS Air Gap Max Phase Delay with RPM Phase Delay [°] 0 RPM Max RPM Rev. 1.2 May 1, 2002 Page 5 of 12 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. ATS672LSB SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE Preliminary – Subject to Change Output Rise Time: R = 500 Ω, C = 10 pF Output Fall Time: R = 500 Ω, C = 10 pF Rev. 1.2 May 1, 2002 Page 6 of 12 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. ATS672LSB SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE Preliminary – Subject to Change Reference Target Dimensions Target Reference Target Diameter (Do) 120 mm Thickness (F) 6.0 mm Tooth Width (T) 23.6 mm Valley Width (PC – T) 23.6 mm Valley Depth (ht) 5.0 mm Reference Target Reference Target Dimensions GEAR PARAMETERS FOR CORRECT

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