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Description
The ATS601LSG is a unique addition to the Allegro™ camshaft sensor IC family of products. As a single element, defined power–on state, sensor IC, it provides first falling edge detection, high running mode edge accuracy, and direction/orientation insensitivity over the full operating range of air gap, speed, and temperature. The ATS601LSG consists of an optimized Hall IC and a simple magnetic pellet configuration. The single element Hall IC and magnetic pellet configuration switches in response to magnetic signals created by a ferromagnetic target. The IC contains a low bandwidth filter that increases the noise immunity and the signal–to–noise ratio of the sensor IC. Sophisticated digital circuit design eliminates the detrimental effects of target geometry discontinuity, magnet and system offsets, and thermal gradients. 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, particularly camshaft sensing. The resulting output of the device is a digital representation of the ferromagnetic target profile. A number of factory programmable options allow for performance optimization to meet specific application requirements. The ATS601 is provided in a 4–pin SIP package (suffix SG) that is lead (Pb) free, with 100% matte tin leadframe plating. ATS601LSG–DS Features and Benefits
- Digital output representing target profile
- Single Hall element for twist–insensitive mounting and direction insensitive polarity
- True zero–speed operation
- Defined power-on state
- Air gap independent switchpoints
- Chopper stabilized
- Operation down to 3.3 V
- Factory programmable options: ▫ Output polarity: low or high opposite tooth ▫ Startup hysteresis: 40 G or 80 G ▫ Threshold location: 30% or 50% from signal peak ▫ Threshold update: single tooth (continuous) or four– tooth memory
- Fully synchronous digital logic with Scan Path and IDDQ testing Single Element, Tooth Detecting Speed Sensor IC Package: 4–pin SIP (suffix SG) Functional Block Diagram ATS601LSG Not to scale Internal Regulator (Analog) Internal Regulator (Digital) VCC Current Limit OUT GND Multiplexed Test Signals Synchronous Digital Controller Tooth Detection Offset Control Application Trim Stop Mode Timer TEST Hall Amplifier Offset Adjust Chopper Stabilization ADC Low Pass Filters Temperature Compensation
Single Element, Tooth Detecting Speed Sensor ICATS601 2Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615–0036 U.S.A. Selection Guide Part Number Packing* ATS601LSGTN–[A]–[AAN]–T 800 pieces per 13–in. reel *Contact Allegro™ for additional packing options. A Running Mode Threshold Update 1: Single-tooth (continuous) 4: Four-tooth (memory-based) Switchpoint Level U: Upper (30% less than input signal peak) M: Mid (50% less than input signal peak) Startup Hysteresis N: Narrow (40 G) W: Wide (80 G) Output Polarity LT: Low opposite target tooth HT: High opposite target tooth Allegro Identifier and Device Type – ATS601 Operating Temperature Range, T A – L: –40°C to 150°C Package Designator – SG Instructions (Packing) – TN: Tape and reel, 800 pieces per 13-in. reel A TNATS601LSGTN Leadframe plating – T : 100% matte tin Configuration Options -- - A Absolute Maximum Ratings Characteristic Symbol Notes Rating Unit Supply Voltage V CC 27 V Reverse Supply Voltage V RCC –18 V Reverse Supply Current I RCC –50 mA Output Voltage V OUT 27 V Reverse Output Voltage V ROUT RPU > 1000 Ω –0.5 V Output Current I OUT Internal current limiting is intended to protect the device from output short circuits, but is not intended for continuous operation. 25 mA Reverse Output Current I ROUT VOUT > –0.5 V, TA = 25°C –50 mA Operating Ambient Temperature T A L temperature range –40 to 150 ºC Maximum Junction Temperature T J(max) 165 ºC Storage Temperature T stg –65 to 170 ºC Terminal List Table Name Number Function VCC 1 Supply voltage OUT 2 Open drain output TEST 3 Test pin (MUX) GND 4 Ground Pin–out Diagram 24 31
Single Element, Tooth Detecting Speed Sensor ICATS601 3Allegro MicroSystems, LLC Worcester, Massachusetts 01615–0036 U.S.A. OPERATING CHARACTERISTICS Valid using Allegro reference target 8X, and VCC and TA within specification; unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. 1 Max. Unit 2
Electrical Characteristics
Supply Voltage3 VCC Continuous operation, TJ < TJ(max) 3.3 – 24 V Undervoltage Lockout4 VCC(UV)rise Rising VCC (0 V → 5 V) 2.5 – 3.1 V VCC(UV)fall Falling VCC (5 V → 0 V) 2.4 – 3.0 V Supply Zener Clamp Voltage V Zsupply ICC = ICC(max) + 3 mA; TA = 25°C 27 – – V Reverse Supply Zener Clamp Voltage V RZsupply ICC = –3 mA, TA = 25°C –18 – – V Supply Current I CC 4 – 10 mA Power-On Characteristics Power-On Time 5 tPO VCC > VCC(min) – – 1 ms Power-On State6 POS Connected as in figure 1 – High – V Output Stage Characteristics Output On Voltage V OUT(SAT) IOUT = 15 mA, Output = On state (VOUT = Low) – – 450 mV Output Zener Clamp Voltage V Zoutput IOUT = 3 mA, TA = 25°C 27 – – V Output Current Limit I OUT(LIM) Output = On state (VOUT = Low) 25 – 80 mA Output Leakage Current I OUT(OFF) VOUT = 24 V, Output = Off state (VOUT = High) – – 10 μA Output Rise Time t r Measured 10% to 90% of VOUT ; RPU = 1 kΩ , CL = 4.7 nF, VPU = 5 V; see figure 2 –1 0– μs Output Fall Time t f Measured 90% to 10% of VOUT ; RPU = 1 kΩ , CL = 4.7 nF, VPU = 5 V; see figure 2 36 1 0 μs Output Delay Time7 td 1 kHz sinusoidal input signal; see figure 3 – 50 – μs Performance Characteristics Operational Air Gap Range8 AG N option Allegro 8X reference target 1.0 – 3.0 mm W option 0.5 – 2.5 mm Magnetic Signal Range B SIG N option Peak to peak signal 60 – 1000 G PKPK W option 120 – 1000 G PKPK Analog Signal Bandwidth BW Equivalent to –3 dB cutoff frequency – 8 – kHz Continued on the next page… CBYPASS 0.1 μF VS VPU RPU CL VCC OUTTEST(Float) Output GND ATS601 Figure 1. Typical application circuit Figure 2. Output Rise Time and Output Fall Time
Worcester, Massachusetts 01615–0036 U.S.A. 1Typical values are at TA = 25°C and VCC = 12 V. Performance may vary for individual units, within the specified maximum and minimum limits. 21 G (gauss) = 0.1 mT (millitesla). 3Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section. 4Between VCC(min) and VCC(UV) output switching continues to occur but device performance is not guaranteed. 5Power–On Time consists of the time from when VCC rises above VCC(min) until the earliest output edge is possible. 6Independent of output polarity option (HT or LT). characteristic of the Allegro 8X reference target. Device functions properly in Running mode down to 0.5 mm air gap. Figure 3. Output Delay Time and Output Fall Time Figure 4. Running Mode Switchpoint and Internal Hysteresis
Single Element, Tooth Detecting Speed Sensor ICATS601 5Allegro MicroSystems, LLC Worcester, Massachusetts 01615–0036 U.S.A. Power Derating Thermal Characteristics may require derating at maximum conditions, see Power Derating section Characteristic Symbol Test Conditions* Value Unit Package Thermal Resistance RθJA Single layer PCB, with copper limited to solder pads 126 ºC/W Single layer PCB, with copper limited to solder pads and 3.57 in.2 (23.03 cm2) copper area each side 84 ºC/W *Additional thermal information available on the Allegro website Power Derating Curve 20 40 60 80 100 120 140 160 180 Temperature (°C) Maximum Allowable V CC (V) VCC(max) VCC(min) (RθJA = 84 °C/W) (RθJA = 126 °C/W) 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 20 40 60 80 100 120 140 160 180 Temperature (°C) Power Dissipation, PD (mW) Power Dissipation versus Ambient Temperature RQJA = 126 ºC/W RQJA = 84 ºC/W
Single Element, Tooth Detecting Speed Sensor ICATS601 6Allegro MicroSystems, LLC Worcester, Massachusetts 01615–0036 U.S.A. Characteristic Performance -50 0 50 100 150 tf (μs) TA (°C) Output Fall Time versus Ambient T emperature RPU = 1kΩ, CVPU = 5V, L = 4.7 nF 100 200 300 400 500 600 -50 0 50 100 150 VOUT(SAT) (mV) TA (°C) Output On Voltage versus Ambient T emperature IOUT (mA) -50 0 50 100 150 ICC (mA) TA (°C) Supply Current versus Ambient T emperature 3.3 VCC (V)
Single Element, Tooth Detecting Speed Sensor ICATS601 7Allegro MicroSystems, LLC Worcester, Massachusetts 01615–0036 U.S.A. 0.2 0.4 0.6 0.8 0 500 1000 1500 2000 2500 Edge PosiƟon (°) Gear Speed (rpm) RelaƟve Timing Accuracy versus Speed Rising Electrical Edge 25°C, RelaƟve to 100 rpm Gear Speed 0.5 1.5 2.5 AG (mm) 0.2 0.4 0.6 0.8 0 500 1000 1500 2000 2500 Edge PosiƟon (°) Gear Speed (rpm) RelaƟve Timing Accuracy versus Speed Falling Electrical Edge 25°C, RelaƟve to 100 rpm Gear Speed 0.5 1.5 2.5 AG (mm) -0.5 0.5 00 . 511 . 522 . 533 . 5 Edge PosiƟon (°) Air Gap (mm) RelaƟve Timing Accuracy versus Air Gap Rising Mechanical Edge, "M" Switchpoint OpƟon 1000 rpm, RelaƟve to 0.5 mm Air Gap -40 150 TA (°C) -0.5 0.5 00 . 511 . 522 . 533 . 5 Edge PosiƟon (°) Air Gap (mm) RelaƟve Timing Accuracy versus Air Gap Falling Mechanical Edge, "M" Switchpoint OpƟon 1000 rpm, RelaƟve to 0.5 mm Air Gap -40 150 TA (°C) -0.5 0.5 00 . 511 . 522 . 533 . 5 Edge PosiƟon (°) Air Gap (mm) RelaƟve Timing Accuracy versus Air Gap Rising Mechanical Edge, "U" Switchpoint OpƟon 1000 rpm, RelaƟve to 0.5 mm Air Gap -40 150 TA (°C) -0.5 0.5 0 0.5 1 1.5 2 2.5 3 3.5 Edge PosiƟon (°) Air Gap (mm) RelaƟve Timing Accuracy versus Air Gap Falling Mechanical Edge, "U" Switchpoint OpƟon 1000 rpm, RelaƟve to 0.5 mm Air Gap -40 150 TA (°C)
Single Element, Tooth Detecting Speed Sensor ICATS601 8Allegro MicroSystems, LLC Worcester, Massachusetts 01615–0036 U.S.A. REFERENCE TARGET 8X Characteristic Symbol Test Conditions Typ. Units Symbol Key Outside Diameter D o Outside diameter of target 120 mm t tV ØDO ht FBranded Face of Package Air Gap Face Width F Breadth of tooth, with respect to branded face 6m m Circular Tooth Length t Length of tooth, with respect to branded face; measured at Do 23.6 mm Circular Valley Length t v Length of valley, with respect to branded face; measured at Do 23.6 mm Tooth Whole Depth h t 5m m Material CRS 1018 – – Reference Target 8X of Package Branded Face Reference Target Characteristics
Worcester, Massachusetts 01615–0036 U.S.A. the offset rejection circuitry. corresponding to a high-to-low output transition. See figure 6. Figure 5. Output Polarity (when connected as shown in figure 1) Figure 6. Start-up behavior (when connected as shown in figure 1 )
Worcester, Massachusetts 01615–0036 U.S.A. information on EMC specification compliance. to the output of the sensor IC. Figure 7. Switching on internal hysteresis
Single Element, Tooth Detecting Speed Sensor ICATS601 11Allegro MicroSystems, LLC Worcester, Massachusetts 01615–0036 U.S.A. Operating Modes Startup Hysteresis Mode After power-on, a minimum amount of peak-to-peak magnetic movement is required before the ATS601 will begin generating output edges. This required signal movement threshold is referred to as the startup hysteresis. There are two programmable options for this startup hysteresis threshold. With narrow (N option) startup hysteresis, the device will switch to a farther air gap, but will have reduced immunity to magnetic overshoot, thus limiting its close air gap capability. With wide (W option) startup hyster- esis, the device will have a reduced maximum air gap capability, but improved magnetic overshoot immunity. After the magnetic signal exceeds the startup hysteresis value for the first time, the device will transition to Calibration mode. Calibration Mode In Calibration mode, the ATS601 uses threshold based switching with continuous update. This ensures that all teeth and valleys are captured correctly, but provides slightly reduced accuracy relative to Running mode. The device stays in Calibration mode long enough to correctly capture enough peaks to fill the Running mode threshold memory. This corresponds to three output edges with the single-tooth update (1 option) and nine edges with the four-tooth update (4 option). After Calibration mode is complete, the device transitions to Running mode. Running Mode In Running mode the ATS601 uses threshold based switching with internal hysteresis described previously, in the Thresh- old Update and Switchpoints sections. The threshold update is intended to optimize output switching accuracy when used with common camshaft targets, including cases with runout and nar- row target valleys. Stop Mode The ATS601 has an internal timer that begins counting on each output edge. If the timer reaches t SM before another output edge occurs, the device moves into Stop mode. Stop mode is the same as Startup Hysteresis mode, but with a hysteresis value determined as a percentage of the previously measured target amplitude. Stop mode ensures no missed or extra output edges, even during situations with large temperature drifts and no target rotation. Watchdog The ATS601 has a peak detector continuously tracking the mag- netic signal. If a sudden large signal change causes the sensor IC output to stop switching but the peak detector continues to detect valid signal movement, the watchdog will be fired. In case of a watchdog event, the sensor IC performs a self-reset and returns to the initial Startup Hysteresis mode to regain output switching.
Single Element, Tooth Detecting Speed Sensor ICATS601 12Allegro MicroSystems, LLC Worcester, Massachusetts 01615–0036 U.S.A. Power Derating Power Derating The device must be operated below the maximum junction tem- perature of the device, T J(max). Under certain combinations of peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the appli- cation. This section presents a procedure for correlating factors affecting operating T J. (Thermal data is also available on the Allegro MicroSystems website.) The Package Thermal Resistance, RJA, is a figure of merit sum- marizing the ability of the application and the device to dissipate heat from the junction (die), through all paths to the ambient air. Its primary component is the Effective Thermal Conductivity, K, of the printed circuit board, including adjacent devices and traces. Radiation from the die through the device case, R JC, is a relatively small component of RJA. Ambient air temperature, TA, and air motion are significant external factors, damped by overmolding. The effect of varying power levels (Power Dissipation, PD), can be estimated. The following formulas represent the fundamental relationships used to estimate T J, at PD. PD = VIN × IIN (1) T J = TA + ΔT (3) For example, given common conditions such as: TA= 25°C, VCC = 12 V, ICC = 7 mA, and RJA = 126 °C/W, then: P D = VCC × ICC = 12 V × 7 mA = 84 mW T = PD × RJA = 84 mW × 126 °C/W = 10.6°C A worst-case estimate, PD(max), represents the maximum allow- able power level (VCC(max), ICC(max)), without exceeding TJ(max), at a selected RJA and TA. Example: Reliability for VCC at TA = 150°C, package SG, using single layer PCB. Observe the worst-case ratings for the device, specifically: RJA = 126°C/W, TJ(max) = 165°C, VCC(absmax) = 24 V , and ICC = 10 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: T(max) = TJ(max) – TA = 165 °C – 150 °C = 15 °C This provides the allowable increase to TJ resulting from internal power dissipation. Then, invert equation 2: PD(max) = T(max) ÷ RJA = 15°C ÷ 126 °C/W = 119 mW Finally, invert equation 1 with respect to voltage: VCC(est) = PD(max) ÷ ICC = 119 mW ÷ 10 mA = 11.9 V The result indicates that, at TA, the application and device can dissipate adequate amounts of heat at voltages ≤VCC(est). Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli- able operation between VCC(est) and VCC(max) requires enhanced RJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and VCC(max) is reliable under these conditions.
Single Element, Tooth Detecting Speed Sensor ICATS601 13Allegro MicroSystems, LLC Worcester, Massachusetts 01615–0036 U.S.A. Package SG, 4-Pin SIP 0.71±0.05 5.50±0.05 4.70±0.10 0.60±0.10 0.40±0.10 24.65±0.10 15.30±0.10
1.0 REF
1.60±0.10 1.27±0.10 5.50±0.10 8.00±0.05 5.80±0.05 1.70±0.10 24 31 A A D B For Reference Only, not for tooling use (reference DWG-9002) Dimensions in millimeters A B C C D E F F Dambar removal protrusion (16X) Metallic protrusion, electrically connected to pin 4 and substrate (both sides) Thermoplastic Molded Lead Bar for alignment during shipment E Hall element, not to scale Active Area Depth, 0.43 mm Branded Face Standard Branding Reference View = Supplier emblem L = Lot identifier N = Last three numbers of device part number Y = Last two digits of year of manufacture W = Week of manufacture LLLLLLL YYWW NNN Branding scale and appearance at supplier discretion 0.38 +0.06 –0.04
Single Element, Tooth Detecting Speed Sensor ICATS601 14Allegro MicroSystems, LLC Worcester, Massachusetts 01615–0036 U.S.A. Copyright ©2013, Allegro MicroSystems, LLC Allegro MicroSystems, LLC reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be required to permit improvements in the per for mance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm. The in for ma tion in clud ed herein is believed to be ac cu rate and reliable. How ev er, Allegro MicroSystems, LLC assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. For the latest version of this document, visit our website: www.allegromicro.com