Allegro ATS632LSC Manual
Contents
1. Dwg MH 021 mm continued next page ATS632LSC HALL EFFECT GEAR TOOTH SENSOR SUBASSEMBLV DIMENSIONS IN MILLIMETERS GATE PROTRUSION 0 3 MAX 1 09 PLATED THRU TYP m 6 0 gt Dwg MH 020 mm Tolerances unless otherwise specified 1 place 0 1 mm 2 places 0 05 mm 115 Northeast Cutoff Box 15036 Worcester Massachusetts 01615 0036 508 853 5000 ATS632LSC HALL EFFECT GEAR TOOTH SENSOR SUBASSEMBLV This page intentionallv left blank ATS632LSC HALL EFFECT GEAR TOOTH SENSOR SUBASSEMBLV ADAPTIVE THRESHOLD SENSORS SELECTION GUIDE Part Number Application ATS535CSB Programmable TPOS large tooth gear position or proximitv sensing commercial temp range ATS535JSB Programmable TPOS large tooth gear position or proximitv sensing industrial auto temp range ATS610LSA Large tooth gear position sensing crank angle cam angle ATS610LSC Large tooth gear position sensing With internal voltage regulator crank angle cam angle ATS611LSB Fine pitch large air gap gear speed sensing transmission speed ABS ATS612JSB Large small tooth gear position sensing crank angle transmission speed cam angle ATS632LSA Large tooth gear position sensing LOW digital output state over a tooth cam angle ATS632LSC Large toot2. Surge Operating Life Autoclave Unbiased JESD22 A102 TA 121 C 15 psig High Temperature JESD22 A103 Bake Storage Life Ta 170 C Temperature Cycle JESD22 A104 ESD CDF AEC Q100 002 Human Body Model 1000 cycles 55 C to 150 C Test to failure All leads gt 8 kV Pre Post 3 per Reading test APPLICATIONS INFORMATION Recommended Evaluation Technique The self calibrating feature of the ATS632LSC requires that a special evaluation technique be used to measure its high accuracy performance capabilities Installation inaccura cies 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 mini mize 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
3. NON ORIENTED HALL EFFECT GEAR TOOTH SENSOR 1 Supply 2 Output 3 Ground Dwg AH 008 PRELIMINARY INFORMATION subject to change without notice April 8 1998 ABSOLUTE MAXIMUM RATINGS Supply Voltage Vcc Reverse Supply Voltage Vacc 1 minute max 24V Output OFF Voltage Vour Output Current lour Internally Limited Reverse Output Current lour Package Power Dissipation See Graph Operating Temperature Range 40 C to 150 C 170 C ATS632LSC ZERO SPEED SELF CALIBRATING The ATS632LSC gear tooth sensor is an optimized Hall effect IC magnet combination that provides tooth vallev recognition and ex tremelv 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 easilv assembled and used in conjunction with a number of gear configurations The gear sensing technologv used for this sensor subassembiv is Hall effect based The sensor incorporates a single element Hall IC that switches in response to absolute magnetic signals created bv a ferrous target The digital output is LOW over a tooth and HIGH over a vallev The sophisticated processing circuitrv contains self calibrating 6 bit A D circuitrv
4. Gap is defined as the distance from the face of the sensor subassembly to the target High High TARGET DESIGN CRITERIA PF Lim Characteristic Symbol Description Eccentricity TARGET DIMENSIONS Diameter Thickness Tooth Width Valley Width Valley Depth Type D F T a EN ON a A em rom Ton 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 TARGET 1 RISING EDGE RELATIVE TIMING ACCURACY IN DEGREES 0 0 25 0 5 0 75 1 0 1 25 AIR GAP IN MILLIMETERS TARGET 2 1 75 Dwg GH 063 4 kW i m RISING EDGE RELATIVE TIMING ACCURACY IN DEGREES 0 0 25 0 5 0 75 1 0 1 25 AIR GAP IN MILLIMETERS 1 5 1 75 Dwg GH 063 6 RELATIVE TIMING ACCURACY IN DEGREES RELATIVE TIMING ACCURACY IN DEGREES FALLING EDGE 0 25 0 5 0 75 1 0 1 25 1 5 1 75 AIR GAP IN MILLIMETERS Dwg GH 063 5 TARGET 42 FALLING EDGE 0 25 0 5 0 75 1 0 1 25 1 5 1 75 AIR GAP IN MILLIMETERS Dwg GH 063 7 continued next page DUTV CVCLE IN PER CENT ATS632LSC HALL EFFECT GEAR TOOTH SENSOR SUBASSEMBLY 50 5 50 0 49
5. 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 circuit protected open collector stage capable of sinking 20 mA An external pull up resistor to a supply voltage of not more th
6. 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 SUBASSEMBLV APPLICATIONS INFORMATION Continued Measurement of the effect of changing air gap after power on 1 Setthe air gap to the desired value nominal for example Rotate the target at the desired speed Applv power to the subassembiv 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 ad justed 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 mini mum 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
7. that adapts the thresholds to the peak to peak signals to minimize the effects of variation in application air gap on switch point timing accuracv The effects of svstem and device offsets are minimized bv using active offset cancellation circuitrv The digital algorithm provides zero speed detection capabilities without the associated running jitter inherent in classical digital solutions The sensor svstem is ideal for use in gathering speed position and profile information of ferrous objects The device is particularly suited to large tooth vallev sensing applications where accurate timing accuracv is a desired feature For applications requiring the sensing of fine pitch gears the ATS611LSB is recommended continued next page Always order by complete part number e g ATS632LSC 9ZL 1Z9LZ jeeus eed ATS632LSC HALL EFFECT GEAR TOOTH SENSOR SUBASSEMBLV FEATURES AND BENEFITS 1200 M Non Oriented Installation E Fully Optimized Gear Tooth Sensors M Single Chip Sensing IC for High Reliability 0 1000 Resa 119 C W 800 Zero Speed Digital Output Representing Target Profile M Extremely Low Timing Accuracy Drift with Tempera iid ture MH Large Operating Air Gaps H Optimized Magnetic Circuit H Self Calibrating Circuitry with Integrated Offset Cancellation 6 bit A D Converters to Capture Peaks j Thresholds Proportional to Peak to Peak Signals 20 40 60 80 100 120 140 1
8. 5 49 0 48 5 48 0 3 En o kf N RELATIVE TIMING ACCURACY IN DEGREES D TYPICAL OPERATING CHARACTERISTICS Continued 0 0 25 0 5 0 75 1 0 1 25 1 5 1 75 AIR GAP IN MILLIMETERS Dwg GH 008 11 RISING EDGE 0 1000 2000 3000 4000 5000 6000 7000 REFERENCE TARGET SPEED IN RPM Dwg GH 064 3 DUTY CYCLE IN PER CENT 50 5 50 0 49 5 49 0 48 5 48 0 3 D LA RELATIVE TIMING ACCURACY IN DEGREES 0 0 25 0 5 0 75 1 0 1 25 1 5 1 75 AIR GAP IN MILLIMETERS Dwg GH 008 12 FALLING EDGE 0 1000 2000 3000 4000 5000 6000 7000 REFERENCE TARGET SPEED IN RPM Dwg GH 064 4 115 Northeast Cutoff Box 15036 Worcester Massachusetts 01615 0036 508 853 5000 ATS632LSC HALL EFFECT GEAR TOOTH SENSOR SUBASSEMBLV 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 Samples Qualification Test Test Conditions Test Length Per Lot Commenis Temperature Humidity JESD22 A101 1000 hrs 48 Device biased for Bias Life Ta 85 C RH 85 minimum power Bias Life JESD22 A108 Ta 150 C Ty 165 C JESD22 A108 Ta 175 C Ty 190 C
9. 60 180 AMBIENT TEMPERATURE IN C 200 ALLOWABLE PACKAGE POWER DISSIPATION IN mW Dwg GH 065 2 FUNCTIONAL BLOCK DIAGRAM 1 SUPPLY 2 OUTPUT THRESHOLD LOGIC OUTPUT CURRENT LIMIT a REFERENCE GENERATOR POSITIVE PEAK TRACK amp HOLD NEGATIVE PEAK TRACK amp HOLD Dwg FH 015 3 115 Northeast Cutoff Box 15036 Worcester Massachusetts 01615 0036 508 853 5000 Copyright 1998 Allegro MicroSystems Inc ATS632LSC HALL EFFECT GEAR TOOTH SENSOR SUBASSEMBLV ELECTRICAL CHARACTERISTICS over operating voltage and temperature range unless otherwise specified Characteristic Test Conditions Srem nee fe a Cds Von onssas ev v ana No EE SETT BI LE ena p a a RE ee hemomer oe 1 ES Calibration Count Output falling mechanical edges 16 Pulses after power on for startup calibration to be complete Calibration Update Nup Output falling mechanical edges Pulses for the threshold calibration to be complete Output Rise Time Output Fall Time NOTE Typical data is at Vcc 12 V and TA 25 C and is for design information only ATS632LSC HALL EFFECT GEAR TOOTH SENSOR SUBASSEMBLY OPERATION over operating voltage and temperature range with reference target unless oth erwise specified Characteristic Operating Air Gap Range Operating Target Speed gt 20 RPM Output Polarity Timing Accuracy NOTE Air
10. an 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 low voltage 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 Inte grated 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 SUBASSEMBLV MECHANICAL INFORMATION KE Package Polvamide 6 12 264 psi deflection temp DTUL 33 glass filled Approximate melting temperature femme Pam FE immma CC CEE ENTI FI TE All industrv 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
11. h gear position sensing LOW digital output state over a tooth with internal voltage regulator cam angle ATS640JSB TPOS gear position sensing for two wire applications Allegro MicroSvstems Inc reserves the right to make from time to time such departures from the detail specifications as mav be required to permit improvements in the design of its products The information included herein is believed to be accurate and reliable However Allegro MicroSvstems Inc assumes no responsibilitv for its use nor for anv infringements of patents or other rights of third parties which mav result from its use 115 Northeast Cutoff Box 15036 Worcester Massachusetts 01615 0036 508 853 5000
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Allegro ATS632LSC Manual