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| ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY ATS632LSC The ATS632LSC gear-tooth sensor is an optimized Hall-effect IC/ magnet combination that provides tooth/valley recognition and extremely accurate tooth edge detection when used with large-pitch targets. The sensor subassembly consists of a high-temperature plastic shell that holds together a compound samarium-cobalt magnet, a single-element self-calibrating Hall-effect IC that has been optimized to the magnetic circuit, and a voltage regulator. This small package, with its non-oriented operation, can be easily assembled and used in conjunction with a number of gear configurations. The gear sensing technology used for this sensor subassembly is Hall-effect based. The sensor incorporates a single-element Hall IC that switches in response to absolute magnetic signals created by a ferrous target. The digital output is LOW over a tooth and HIGH over a valley. The sophisticated processing circuitry contains self-calibrating 6-bit A/D circuitry that adapts the thresholds to the peak-to-peak signals to minimize the effects of variation in application air gap on switch-point timing accuracy. The effects of system and device offsets are minimized by using active offset cancellation circuitry. The digital algorithm provides zero-speed detection capabilities without the associated running jitter inherent in classical digital solutions. The sensor system is ideal for use in gathering speed, position and profile information of ferrous objects. The device is particularly suited to large tooth/valley sensing applications where accurate timing accuracy is a desired feature. For applications requiring the sensing of fine-pitch gears, the ATS611LSB is recommended. ZERO-SPEED, SELF-CALIBRATING, NON-ORIENTED, HALL-EFFECT GEAR-TOOTH SENSOR Data Sheet 27627.126 1 = Supply 2 = Output 3 = Ground 12 3 Dwg. AH-008 PRELIMINARY INFORMATION (subject to change without notice) April 8, 1998 ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC ......................... 24 V Reverse Supply Voltage, VRCC (1 minute max.) ................ -24 V Output OFF Voltage, VOUT ................ 24 V Output Current, IOUT .. Internally Limited Reverse Output Current, I OUT ........ 50 mA Package Power Dissipation, PD .................................... See Graph Operating Temperature Range, TA ........................... -40C to +150C Storage Temperature, TS ............ +170C continued next page... Always order by complete part number, e.g., ATS632LSC . ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY ALLOWABLE PACKAGE POWER DISSIPATION IN mW FEATURES AND BENEFITS s s s s s s s s Non-Oriented Installation Fully Optimized Gear-Tooth Sensors Single-Chip Sensing IC for High Reliability Zero-Speed Digital Output Representing Target Profile Extremely Low Timing Accuracy Drift with Temperature Large Operating Air Gaps Optimized Magnetic Circuit Self-Calibrating Circuitry with Integrated Offset Cancellation 6-bit A/D Converters to Capture Peaks Thresholds Proportional to Peak-to-Peak Signals 1200 1000 800 RJA = 119C/W 600 400 200 0 20 40 60 80 100 120 140 AMBIENT TEMPERATURE IN C 160 180 Dwg. GH-065-2 FUNCTIONAL BLOCK DIAGRAM 1 SUPPLY REG MAGNET GAIN X 100 2 THRESHOLD OUTPUT LOGIC OUTPUT - + REFERENCE GENERATOR 330 pF CURRENT LIMIT PEAK OFFSET POSITIVE PEAK TRACK & HOLD 3 NEGATIVE PEAK TRACK & HOLD GROUND Dwg. FH-015-3 115 Northeast Cutoff, Box 15036 W Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1998, Allegro MicroSystems, Inc. ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY ELECTRICAL CHARACTERISTICS over operating voltage and temperature range (unless otherwise specified). Limits Characteristic Supply Voltage Under-Voltage Lockout Low Output Voltage Output Current Limit Output Leakage Current Supply Current Calibration Count Symbol VCC VCC(UV) VOUT(L) IOUTM IOFF ICC ncal Test Conditions Operating, TJ < 165C IOUT = 5 mA, VCC = 0 6 V IOUT = 5 mA, Output ON VOUT = 12 V VOUT = 24 V, Output OFF Output OFF, Target Speed = 0 RPM Output falling mechanical edges after power on for startup calibration to be complete Output falling mechanical edges for the threshold calibration to be complete VCC > 6 V RL = 2.5 k, CL = 10 pF RL = 2.5 k, CL = 10 pF Min. 6.0 - - 25 - - 16 Typ. 12 5.0 0.7 45 5.0 9.0 16 Max. 24 - 1.6 55 10 15 16 Units V V V mA A mA Pulses Calibration Update nup 64 64 64 Pulses Power-On Time Output Rise Time Output Fall Time tpo tr tf - - - 200 3.0 1.0 500 6.0 3.0 s s s NOTE: Typical data is at V CC = 12 V and T A = +25C and is for design information only. ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY OPERATION over operating voltage and temperature range with reference target (unless otherwise specified). Limits Characteristic Operating Air Gap Range Symbol AG Test Conditions Operating, Target Speed > 20 RPM Operating, Over Tooth Operating, Over Valley Timing Accuracy t Target Speed < 3500 RPM, 0.3 mm AG 1.9 mm Min. 0.3 Typ. - Max. 1.9 Units mm Output Polarity - Low High - Low High 0.25 Low High 0.50 - - NOTE: Air Gap is defined as the distance from the face of the sensor subassembly to the target. TARGET DESIGN CRITERIA Limits Characteristic Valley Depth Valley Width Tooth Width Thickness Eccentricity Symbol ht (P C - T) T F - Timing accuracy may change Description Min. - - - - - Typ. 5.0 5.0 5.0 5.0 - Max. - - - - 0.25 Units mm mm mm mm mm TARGET DIMENSIONS Type Reference Target Characterization Target #1 Characterization Target #2 Diameter (D o) 84 mm 84 mm 35 mm Thickness (F) 16 mm 16 mm 7 mm Tooth Width (T) 9 mm 1 tooth, 180 1 tooth, 180 Valley Width (PC - T) 13 mm Valley Depth (ht ) 5 mm 5 mm 6 mm NOTE: Timing accuracy data is taken by recalibrating the unit at each air gap. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY TYPICAL OPERATING CHARACTERISTICS 3.0 TARGET #1 3.0 TARGET #1 RELATIVE TIMING ACCURACY IN DEGREES RELATIVE TIMING ACCURACY IN DEGREES 2.0 -40C +25C +150C 2.0 -40C +25C +150C 1.0 RISING EDGE 0 1.0 0 FALLING EDGE -1.0 -1.0 -2.0 -2.0 -3.0 0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 Dwg. GH-063-4 -3.0 0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 Dwg. GH-063-5 AIR GAP IN MILLIMETERS AIR GAP IN MILLIMETERS 3.0 TARGET #2 3.0 TARGET #2 RELATIVE TIMING ACCURACY IN DEGREES RELATIVE TIMING ACCURACY IN DEGREES 2.0 -40C +25C +150C 2.0 -40C +25C +150C 1.0 1.0 0 RISING EDGE -1.0 0 FALLING EDGE -1.0 -2.0 -2.0 -3.0 0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 Dwg. GH-063-6 -3.0 0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 Dwg. GH-063-7 AIR GAP IN MILLIMETERS AIR GAP IN MILLIMETERS continued next page... ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY TYPICAL OPERATING CHARACTERISTICS -- Continued 51.0 TARGET #1 50.5 -40C +25C +150C 51.0 TARGET #2 50.5 -40C +25C +150C DUTY CYCLE IN PER CENT 50.0 DUTY CYCLE IN PER CENT 0.5 50.0 49.5 49.5 49.0 49.0 48.5 48.5 48.0 0 0.25 0.75 1.0 1.25 1.5 1.75 48.0 0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 AIR GAP IN MILLIMETERS Dwg. GH-008-11 AIR GAP IN MILLIMETERS Dwg. GH-008-12 +3 +3 RELATIVE TIMING ACCURACY IN DEGREES +2 RELATIVE TIMING ACCURACY IN DEGREES +2 +1 +1 0 RISING EDGE -1 AIR GAPS -2 0.5 mm 1.0 mm 1.5 mm 2.0 mm 0 FALLING EDGE -1 AIR GAPS -2 0.5 mm 1.0 mm 1.5 mm 2.0 mm -3 0 1000 2000 3000 4000 5000 6000 7000 Dwg. GH-064-3 -3 0 1000 2000 3000 4000 5000 6000 7000 Dwg. GH-064-4 REFERENCE TARGET SPEED IN RPM REFERENCE TARGET SPEED IN RPM 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY CRITERIA FOR DEVICE QUALIFICATION All Allegro sensors are subjected to stringent qualification requirements prior to being released to production. To become qualified, except for the destructive ESD tests, no failures are permitted. Test Method and Test Conditions JESD22-A101, TA = 85C, RH = 85% JESD22-A108, TA = 150C, TJ = 165C JESD22-A108, TA = 175C, TJ = 190C JESD22-A102, TA = 121C, 15 psig JESD22-A103, TA = 170C JESD22-A104 CDF-AEC-Q100-002 Samples Per Lot 48 48 48 48 48 48 3 per test -55C to +150C Test to failure All leads > 8 kV Qualification Test Temperature Humidity Bias Life Bias Life (Surge Operating Life) Autoclave, Unbiased High-Temperature (Bake) Storage Life Temperature Cycle ESD, Human Body Model Test Length 1000 hrs 1000 hrs 168 hrs 96 hrs 1000 hrs 1000 cycles Pre/Post Reading Comments Device biased for minimum power APPLICATIONS INFORMATION Recommended Evaluation Technique. The selfcalibrating feature of the ATS632LSC requires that a special evaluation technique be used to measure its highaccuracy performance capabilities. Installation inaccuracies are calibrated out at power on; hence, it is extremely important that the device be re-powered at each air gap when gathering timing accuracy data. Self-Calibrating Functions. This subassembly is designed to minimize performance variation caused by the large air gap variations resulting from installation by self-calibrating at power-on. It is also designed to minimize performance variation caused by the smaller, slower air gap changes resulting from temperature change and gear run-out during continuous operation by updating the self-calibration periodically (after every 64 output pulses) if necessary. These two functions should be tested using the following procedure. 1. Set the air gap to the desired value. 2. Power down and then power on the device. 3. Rotate the target at the desired speed. 4. Wait for calibration to complete (16 output pulses to occur). 5. Monitor output for correct switching and measure accuracy. 6. Repeat the above for multiple air gaps within the operating range of the device. 7. This can be repeated over the entire temperature range. ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY APPLICATIONS INFORMATION -- Continued Measurement of the effect of changing air gap after power on: 1. Set the air gap to the desired value (nominal, for example). Rotate the target at the desired speed. Apply power to the subassembly. Wait for 16 output pulses to occur. Monitor output for correct switching and measure accuracy. 2. Change the air gap by 0.25 mm. Do not re-power subassembly. Wait for 64 output pulses to occur. Monitor the output for correct switching and measure accuracy. Device Switch Points. The device switch points are referenced to the peak-to-peak values of the gain-adjusted signal. The comparator thresholds have been chosen to provide timing accuracy, as well as limited immunity from mis-detection caused by short valley conditions or by gear run-out. Gear Design Criteria.* The system was designed to work correctly with minimum valley depths of 5 mm and minimum valley widths of 13 mm. As the valley depth decreases, the valley field rises above the open-circuit value of the magnetic circuit when the sensor is at minimum air gap. The same is true when the valley width decreases. In both cases, the metal mass from the valley bottom or side walls provides an interference at minimum air gap and will provide a signal that may be interpreted as a tooth upon power on. It is important to note that this anomaly will normally only affect the power-on state of the device and the self-calibration circuitry will null this baseline shift when the device is in running mode. * In application, the terms "gear" and "target" are often interchanged. However, "gear" is preferred when motion is transferred. Signal-Timing Accuracy. Timing accuracy is improved with larger gear diameters. The magnetic field profile has a defined spread that narrows in degrees as the target diameter increases. The slope of this magnetic profile also changes with air gap. For highest accuracy, targets greater than 100 mm diameter should be used. Operation with Fine-Pitch Gears. The self-calibration routines allow the detection of fine-pitch gears once the target is rotating. The major issue in these applications is the impact of gear run-out on the baseline of the magnetic field. Excessive run-out may result in tooth edges not being detected. Signal Duty Cycle. For regular tooth geometries, precise duty cycle is maintained over the operating air gap and temperature range due to the good symmetry of the magnetic switch points of the device. Output. The output of the subassembly is a short-circuitprotected open-collector stage capable of sinking 20 mA. An external pull-up (resistor) to a supply voltage of not more than 24 V must be supplied either at the sensor module or at the controller. Output Polarity. The switching of the output is independent of the direction of gear rotation. Power Supply Protection. These devices require minimal protection circuitry during operation from a lowvoltage line. The internal voltage regulator provides immunity to power supply variations between 6 V and 24 V. EMI/RFI protection is provided as part of the internal regulator. In extremely noisy environments, additional (external) components may be required. Additional applications Information on gear-tooth and other Hall-effect sensors is provided in the Allegro Integrated and Discrete Semiconductors Data Book or Application Note 27701. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY MECHANICAL INFORMATION Component Package Material Polyamide 6/12, 33% glass filled High-temperature FR-4 1 oz Copper 63/37 tin/lead solder plate - Function 264 psi deflection temp. (DTUL) Approximate melting temperature Glass transition temperature - - - Units 200C 219C 170C - UL94V-0 Circuit Board Terminals Terminal Finish Flame Class Rating All industry-accepted soldering techniques are permitted for these subassemblies provided the indicated maximum temperature for each component (e.g., sensor face, plastic housing) is not exceeded. Reasonable dwell times, which do not cause melting of the plastic housing, should be used. Sensor Location (in millimeters) (sensor location relative to package center is the design objective) A 0.1 Dwg. MH-021 mm continued next page... ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY DIMENSIONS IN MILLIMETERS GATE PROTRUSION 0.3 MAX 1 A 6.6 5.0 1.5 TYP 3 1.0 O PLATED THRU TYP 5.0 6.0 0.8 4.9 11.0 O 10.0 MAX 27.5 3 2 1.0 TYP Tolerances unless otherwise specified: 1 place 0.1 mm, 2 places 0.05 mm. 1 Dwg. MH-020 mm 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY This page intentionally left blank ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY ADAPTIVE THRESHOLD SENSORS SELECTION GUIDE Part Number ATS535CSB ATS535JSB ATS610LSA ATS610LSC ATS611LSB ATS612JSB ATS632LSA ATS632LSC ATS640JSB Application Programmable, TPOS, large-tooth gear-position or proximity sensing (commercial temp. range) Programmable, TPOS, large-tooth gear-position or proximity sensing (industrial/auto. temp. range) Large-tooth, gear-position sensing - crank angle, cam angle Large-tooth, gear-position sensing with internal voltage regulator - crank angle, cam angle Fine-pitch, large air gap, gear speed sensing - transmission speed, ABS Large/small-tooth gear-position sensing - crank angle, transmission speed, cam angle Large-tooth, gear-position sensing (LOW digital output state over a tooth), cam angle Large-tooth, gear-position sensing (LOW digital output state over a tooth), with internal voltage regulator - cam angle TPOS, gear-position sensing for two-wire applications Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 |
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