ATS667LSGTN-T;中文规格书,Datasheet资料

1、 ATS667LSGTrue Zero-Speed, High Accuracy Gear Tooth SensorFeatures and BenefitsDescription Optimized robustness against magnetic offset variation Small signal lockout for immunity against vibration Tight duty cycle and timing accuracy over full operatingtemperature rangeThe ATS667 is a true zero-spe

2、ed gear tooth sensor IC consistingof an optimized Hall IC-rare earth pellet configuration in asingle overmolded package. The unique IC and package designprovides a user-friendly solution for digital gear tooth sensingapplications. This small package can be easily assembled andused in conjunction wit

3、h gears of various shapes and sizes. True zero-speed operation Air gap independent switchpoints Large operating air gaps achieved through use of gainadjust and offset adjust circuitry Defined power-on state (POS) Wide operating voltage range Digital output representing target profile Single chip sen

4、sing IC for high reliability Small mechanical size Optimized Hall IC magnetic system Fast start-upThe device incorporates a dual element Hall IC that switchesin response to differential magnetic signals created by a ferro-magnetic target. The IC contains a sophisticated compensatingcircuit designed

5、to eliminate the detrimental effects of magnetand system offsets. Digital processing of the analog signalprovides zero-speed performance independent of air gap andalso dynamic adaptation of device performance to the typicaloperating conditions found in automotive applications (reducedvibration sensi

6、tivity). High-resolution peak detecting DACsare used to set the adaptive switching thresholds of the device.Hysteresis in the thresholds reduces the negative effects of anyanomalies in the magnetic signal associated with the targetsused in many automotive applications. Undervoltage lockout (UVLO)Pac

7、kage: 4-pin SIP (suffix SG)The ATS667 is optimized for transmission applications. It isavailable in a lead (Pb) free 4-pin SIP package with a 100%matte tin plated leadframe.Not to scaleFunctional Block DiagramVCCThresholdComparatorAutomaticGainControlPDACNDACThresholdLogicHallAmpOffsetAdjustReferenc

8、eGeneratorNThreshTESTCurrentLimitOutputTransistorVOUTGNDATS667-DS, Rev. 5/ ATS667LSGTrue Zero-Speed, High Accuracy Gear Tooth Sensor ICSelection GuidePart NumberPacking*ATS667LSGTN-T13-in. reel, 800 pieces/reel*Contact Allegro for additional packing optionsAbsolute Maximum RatingsSymbolNotesRating26

9、.5UnitVmACCCOperating Ambient TemperatureMaximum Junction TemperatureStorage TemperatureTstg65 to 170Pin-out DiagramTerminal ListNumberNameFunction123434TESTGNDTie to GND or floatGround2Allegro MicroSystems, Inc.115 Northeast CutoffWorcester, Massachusetts 01615-0036 U.S.A.1.508.853.5000; / ATS667LS

10、GTrue Zero-Speed, High Accuracy Gear Tooth Sensor ICOPERATING CHARACTERISTICSValid over operating voltage and temperature ranges; unless otherwise notedSymbolTest ConditionsMin.Typ.1Max.UnitICC = 15 mA, T = 25 CPower-On State CharacteristicsPower-On StateSROT V (min)VOUT(SAT) IOUT = 10 mA, Output =

11、onVZOUT IOUT = 3 mA, T = 25CIOUT(LIM) VOUT = 12 V, T T (max)IOUT(OFF) Output = off, VOUT = 24 VD-to- A Converter (DAC) CharacteristicsAllowable User Induced DifferentialOffset4,5BDIFFEXT User induced differential offsetCalibrationPossible reduced edge detection accuracy, dutycycle not guaranteedCont

12、inuous Operating Characteristics (with Allegro 60-0 Reference Target)AGOPAGOPMAX Output switching only (no missing edges)100 G ideal sinusoidal signal, T = 150C,Maximum Operational Air Gap RangeSROT = 1000 rpm (f = 1000 Hz)Percentage of most recent AGinstantaneous air gap increase, f VLOE after sudd

13、en AG changeAG 4042Measured as VWobble 0.5 mm, AG AG (max) ,directionof target rotation pin 4 to pin 1, connected as in figure 6;Duty CycleD4752%OPOPContinued on the next page3Allegro MicroSystems, Inc.115 Northeast CutoffWorcester, Massachusetts 01615-0036 U.S.A.1.508.853.5000; / ATS667LSGTrue Zero

14、-Speed, High Accuracy Gear Tooth Sensor ICOPERATING CHARACTERISTICS (continued)Valid over operating voltage and temperature ranges; unless otherwise notedSymbolTest ConditionsMin.Typ.1Max.UnitAllegro 600 Reference TargetCutoff frequency for low-pass filter% of peak-to-peak VPDAC to NDAC, AG AGmax, V

15、OUT high to lowBOPBRPVLOE(RM)VLOR(RM)% of peak-to-peak VPDAC to NDAC, AG AGmax VLOE(RM) = output switchingRunning Mode Lockout Enable (LOE)Running Mode Lockout Release (LOR) 100 220mVmVV VLOR(RM) = output switchingPROC(PK-PK)enabled1Typical data is at VCC = 12 V and T = 25C, unless otherwise noted.

16、Performance may vary for individual units, within the specified maximum andAminimum limits.Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section.2Power-On Time is the time required to complete the internal Automatic Offset Adjust; the DACs are th

17、en ready for peak acquisition.341 G (gauss) = 0.1 mT (millitesla).5The device compensates for magnetic and installation offsets. Offsets greater than specification in gauss may cause inaccuracies in the output.6For power-on S200 rpm, edges are sensed target mechanical edges (see figure Definitions o

18、f Terms for Switchpoints).ROTOperational Air Gap Range is dependent on the available magnetic field. The available field is target geometry and material dependent and should be7independently characterized. The field available from the Allegro 60-0 reference target is given in the reference target pa

19、rameter section.8The repeatability specification is based on statistical evaluation of a sample population, evaluated at 1000 Hz. Repeatability is measured at 150Cbecause the lowest signal-to-noise ratio for the VPROC signal occurs at elevated temperatures. Therefore, the worst-case repeatability fo

20、r the devicewill also occur at elevated temperatures.9Single maximum allowable air gap change in outward direction (increase in air gap).Definitions of Terms for SwitchpointsSensed EdgeaReverseToothValleyForward+B)c Gi (tenFDbFgBIaM ,ybl tia si ntn ee Dre xf ufi lD F B+VdessecVPROC(BOP)VPROC(BRP)o )

21、VrP (100 %lcoai VrPtnBRP%e ,lr aBOP%e nf gfi iD S VtaSensed Edge: leading (rising) mechanical edge in forward rotation, trailing (falling) mechanical edge in reverse rotationbBOP(FWD)triggers the output transition during forward rotation, and B triggers the output transition during reverse rotationO

22、P(REV)4Allegro MicroSystems, Inc.115 Northeast CutoffWorcester, Massachusetts 01615-0036 U.S.A.1.508.853.5000; / ATS667LSGTrue Zero-Speed, High Accuracy Gear Tooth Sensor ICReference Target 60-0 (60 Tooth Target)1206hDtFOBreadth of tooth, with respectto branded facetVtTooth Whole DepthMaterial3mmLow

23、 Carbon SteelAir GapReference Gear Magnetic Gradient Amplitude versus Air Gap)G(BlaitnereiD600-400ot-kBranded Faceof Package200Reference Target60-0001.02.03.0Air Gap (mm)600400Air Gap (mm)(Blaitn0ereiD20040060002468101214161820Gear Rotation ()5Allegro MicroSystems, Inc.115 Northeast CutoffWorcester,

24、 Massachusetts 01615-0036 U.S.A.1.508.853.5000; / ATS667LSGTrue Zero-Speed, High Accuracy Gear Tooth Sensor ICCharacteristic PerformanceSupply Current (Off) versus Ambient TemperatureSupply Current (Off) versus Supply Voltage14141210812108T (C)A)AAmm40(FFOFFO2515066CCI442200-500501001500102030T (C)A

25、Supply Current (On) versus Ambient TemperatureSupply Current (On) versus Supply Voltage14141210812108)VCC(V)T (C)AAAmm40(NOCCINOCCI2515066442200-5000102030ADuty Cycle versus Air GapAllegro 60-0 Reference Target180160140120100805251504948474645444342)Vm(T (C)A)%40)T(ASD25150(TUOV6040200-5005010015000

26、.51.01.52.02.53.0T (C)AG (mm)A6Allegro MicroSystems, Inc.115 Northeast CutoffWorcester, Massachusetts 01615-0036 U.S.A.1.508.853.5000; / ATS667LSGTrue Zero-Speed, High Accuracy Gear Tooth Sensor ICTHERMAL CHARACTERISTICS may require derating at maximum conditions, see application informationCharacte

27、risticSymbolValue UnitsSingle-sided PCB with copper limited to solder padsC/WPackage Thermal ResistanceRJATwo-sided PCB with copper limited to solder pads and 3.57 in.284C/W(23.03 cm ) of copper area each side, connected to GND pin2*Additional information is available on the Allegro website.Power De

28、rating Curve252423VCC(max)222120191817161514131211109)(VCCVelbawo(R = 84 C/W)llAmum(R = 126 C/W)ixaM876543VCC(min)220406080100120140160180Temperature (C)Power Dissipation versus Ambient Temperature1900180017001600150014001300)Wm 1200(110010009008007006005004003002001000DPQJ =A,noita)pissiDrewoP20406

29、080100120140160180Temperature (C)7Allegro MicroSystems, Inc.115 Northeast CutoffWorcester, Massachusetts 01615-0036 U.S.A.1.508.853.5000; / ATS667LSGTrue Zero-Speed, High Accuracy Gear Tooth Sensor ICFunctional DescriptionHall Technologyassembly costs for most applications.The ATS667 contains a sing

30、le-chip differential Hall-effect sensorIC, a samarium cobalt pellet, and a flat ferrous pole piece (con-centrator). As shown in figure 1, the Hall IC supports two Hallelements, which sense the magnetic profile of the ferrous geartarget simultaneously, but at different points (spaced at a 2.2 mmDeter

31、mining Output Signal PolarityIn figure 3, the top panel, labeled Mechanical Position, representsthe mechanical features of the target gear and orientation to thedevice. The bottom panel, labeled IC Output Signal, displays thesquare waveform corresponding to the digital output signal thatresults from

32、 a rotating gear configured as shown in figure 2, andelectrically connected as in figure 6. That direction of rotation (ofthe gear side adjacent to the package face) is: perpendicular tothe leads, across the face of the device, from the pin 1 side to thepin 4 side. This results in the IC output swit

33、ching from low stateto high state as the leading edge of a tooth (a rising mechanicaledge, as detected by the IC) passes the package face. In this con-figuration, the device output switches to its high polarity when atooth is the target feature nearest to the package. If the directionof rotation is

34、reversed, so that the gear rotates from the pin 4 sideto the pin 1 side, then the output polarity inverts. That is, the out-put signal goes high when a falling edge is detected, and a valleyis nearest to the package.pitch), generating a differential internal analog voltage, Vthat is processed for pr

35、ecise switching of the digital output signal.,PROCThe Hall IC is self-calibrating and also possesses a tempera-ture compensated amplifier and offset cancellation circuitry. Itsvoltage regulator provides supply noise rejection throughout theoperating voltage range. Changes in temperature do not great

36、lyaffect this device due to the stable amplifier design and the offsetcompensation circuitry. The Hall transducers and signal process-ing electronics are integrated on the same silicon substrate, usinga proprietary BiCMOS process.Target Profiling During OperationAn operating device is capable of pro

37、viding digital informationthat is representative of the mechanical features of a rotating gear.The waveform diagram in figure 3 presents the automatic transla-tion of the mechanical profile, through the magnetic profile thatit induces, to the digital output signal of the ATS667. No addi-tional optim

38、ization is needed and minimal processing circuitry isrequired. This ease of use reduces design time and incrementalMechanical Position (Target movement pin 1 to pin 4)This toothsensed earlierThis toothsensed laterTarget Magnetic Profile+BTarget (Gear)Package Orientation to TargetElement PitchHall El

39、ement PitchHall Element 2Hall Element 1Hall ICBranded FaceICPole Piece(Concentrator)South PoleNorth PoleDual-ElementHall Effect DeviceBack-biasingRare-earth PelletCaseIC Internal Differential Analog Signal, VPROC(Pin 4 Side)(Pin 1 Side)Figure 1. Relative motion of the target is detected by the dual

40、Hallelements mounted on the Hall IC.BBOP(#1)OP(#2)BBranded FaceOffOnOffRotating Targetof Package14Figure 2. This left-to-right (pin 1 to pin 4) direction of target rotation resultsin a high output state when a tooth of the target gear is nearest thepackage face (see figure 3). A right-to-left (pin 4

41、 to pin 1) rotation invertsthe output signal polarity.Figure 3. The magnetic profile reflects the geometry of the target, allowingthe ATS667 to present an accurate digital output response.8Allegro MicroSystems, Inc.115 Northeast CutoffWorcester, Massachusetts 01615-0036 U.S.A.1.508.853.5000; ATS667L

42、SGTrue Zero-Speed, High Accuracy Gear Tooth Sensor ICContinuous Update of SwitchpointsSwitchpoints are the threshold levels of the differential internalAs shown in panel C of figure 4, threshold levels for the ATS667switchpoints are established as a function of the peak input signalanalog signal, Vs

43、tate. The value of V, at which the device changes output signalPROCis directly proportional to the magnetic flux levels. The ATS667 incorporates an algorithm that continuouslyPROCdensity, B, induced by the target and sensed by the Hall elements. monitors the input signal and updates the switching th

44、resholdsAs V rises through a certain limit, referred to as the operate accordingly with limited inward movement of V . Theswitchpoint for each edge is determined by the detection of thefalls below B to a certain limit, the release point, B , the output previous two signal edges. In this manner, vari

45、ations are trackedPROCPROCpoint, B , the output state changes from high to low. As VOPPROCOPRPstate changes from low to high.in real time.(A) TEAG varying; cases such aseccentric mount, out-of-round region,normal operation position shift(B) Internal analog signal, VPROC,typically resulting in the IC

46、V+SmallerTEAG)V(CORPVHysteresis Band(Delimited by switchpoints)SmallerTEAGLargerTEAGICIC0360Target Rotation ()(C) Referencing the internal analog signal, VPRO, tCo continuously update device responseV+DeterminantPeak ValuesBHYSSwitchpointPk(#3)(VVBVHYS(#3)VCBBORPBHYS(#1)HYS(#4)HYS(#2)VVVBOP(#4)BRP(#

47、4)Pk(#7), Pk(#8)Pk(#8), Pk(#9)4BRP(#1)BRP(#2)BRP(#3)BRP(#4)Figure 4. The Continuous Update algorithm allows the Allegro IC to interpret and adapt to variances in the magnetic field generated by thetarget as a result of eccentric mounting of the target, out-of-round target shape, and similar dynamic

48、application problems that affect the TEAG(Total Effective Air Gap). Not detailed in the figure are the boundaries for peak capture DAC movement which intentionally limit the amount ofinward signal variation the IC is able to react to over a single transition. The algorithm is used to establish and s

49、ubsequently update the deviceswitchpoints (BOP and B ). The hysteresis, BHYS(#x), at each target feature configuration results from this recalibration, ensuring that it remainsRPproperly proportioned and centered within the peak-to-peak range of the internal analog signal, VPROC.As shown in panel A,

50、 the variance in the target position results in a change in the TEAG. This affects the IC as a varying magnetic field, whichresults in proportional changes in the internal analog signal, VPROC, shown in panel B. The Continuous Update algorithm is used to establishswitchpoints based on the fluctuatio

51、n of VPROC, as shown in panel C.9Allegro MicroSystems, Inc.115 Northeast CutoffWorcester, Massachusetts 01615-0036 U.S.A.1.508.853.5000; ATS667LSGTrue Zero-Speed, High Accuracy Gear Tooth Sensor ICStart Mode HysteresisThis feature helps to ensure optimal self-calibration by rejectingelectrical noise

52、 and low-amplitude target vibration duringinitialization. This prevents AGC from calibrating the IC on suchspurious signals. Calibration can be performed using the actualtarget features.A typical scenario is shown in figure 5. The Start Mode Hysteresis,PO , is a minimum level of the peak-to-peak amplitude of theinternal analog