PDF ATS672LSB Data sheet ( Hoja de datos )

Número de pieza	ATS672LSB
Descripción	Self-Calibrating TPO Gear-Tooth Sensor
Fabricantes	Allegro MicroSystems
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ATS672LSB Preliminary – Subject to Change PIN OUT DIAGRAM 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 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 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 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). 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). www.DaTtaShheeet4AU.cTomS672LSB 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. 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 1 page ATS672LSB SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE Preliminary – Subject to Change Relative Timing Accuracy Absolute Timing Accuracy Target Target Device Output TAbsRise TAbsFall Device Output TAbsRise (Max - Min) TAbsFall (Max - Min) Operational Air Gap Valley Tooth Air Gap Valley TAbsFall (Max - Min) TPOS Air Gap Tooth TPOS Air Gap Min TPOS Air Gap Range TPOS Air Gap Max Phase Delay with RPM RPM0 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. 5 Page ATS672LSB SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE Preliminary – Subject to Change Power Derating Curve: ATS672LSB Package Power Derating Due to internal power consumption, the temperature of the IC (junction temperature, Tj) is higher than the ambient environment temperature, Ta. To ensure that the device does not operate above the maximum rated junction temperature use the following calculations: ∆T=PD * RθJA Where PD=Vcc * Icc ∴ ∆T=Vcc * Icc * RθJA Where ∆T denotes the temperature rise resulting from the IC’s power dissipation: TJ = TA + ∆T RθJA =150°C/W TJ(max) = 170°C Typical TJ Calculation: TA =25°C, Vcc=5 V, Icc(On)=6.5 mA PD=Vcc * Icc PD= 5 V * 6.5 mA = 32.5 mW ∆T=PD* RθJA = 32.5 mW * 150°C/W = 4.9° TJ = TA + ∆T = 25°C + 4.9°C = 29.9°C Maximum Allowable Power Dissipation Calculation TJ = TA + ∆T TJ (max) = 170°C, if TA=160°C then: 170 = 160 + ∆T ∆T = 10°C ∆T = PD* RθJA (RθJA = 150°C/W) ∴ PD(max) = 10°C / 150°C/W = 66.6 mW @ TA = 160°C Maximum Vcc for PD(max) =111 mW at TA=160°C PD=Vcc * Icc Icc = 10 mA (max) at 160°C Vcc = PD / Icc = 66.6 mW / 10 mA = 6.66 V Maximum Power Dissipation vs. Ambient Temperature 1000 SB Package: Thermal Resistance: 150°C/Watt 900 800 700 600 500 400 300 200 100 0 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 Ambient Temperature [°C] Rev. 1.2 May 1, 2002 Page 11 of 12 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1995 Allegro MicroSystems, Inc. 11 Page

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