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ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors data sheet 27627.100 the ats610lsa and ATS611LSB gear-tooth sensors are opti- mized hall ic plus magnet subassemblies that provide a user-friendly solution for digital gear-tooth sensing applications. each subassembly combines in a compact high-temperature plastic package, a samarium-cobalt magnet, a pole piece, and a differential hall-effect ic that has been optimized to the magnetic circuit. these sensors can be easily used in conjunction with a wide variety of gear or target shapes and sizes. the ats610lsa is designed to provide increased immunity to false switching in applications that require the sensing of large-tooth gears (e.g., crank angle or cam angle). the ATS611LSB is optimized to sense fine-pitch gears over large working air gaps (e.g., transmis- sion or abs). these sensor subassemblies are ideal for use in gathering speed, position, and timing information using gear-tooth-based configurations. the gear-sensing technology used for these sensor plus magnet subassemblies is hall-effect based. the sensor incorporates a dual-element hall ic that switches in response to differential magnetic signals created by the ferrous target. the circuitry contains a patented track-and-hold peak-detecting circuit to eliminate magnet and system offset effects. this circuit has the ability to detect relatively fast changes, such as those caused by gear wobble and eccentricities, and provides stable operation at extremely low rotation speeds. always order by complete part number, e.g., ats610lsa . continued next page features and benefits fully optimized differential digital gear-tooth sensor single-chip sensing ic for high reliability extremely low timing accuracy drift with temperature large operating air gaps small mechanical size optimized magnetic circuit patented peak-detecting filter: <200 s power-on time <10 rpm operation (single-tooth target) correct first-edge detection uses small value ceramic capacitors under-voltage lockout wide operating voltage range defined power-up state dwg. ah-006 1 2 3 4 pin 1 = supply pin 2 = output pin 3 = capacitor pin 4 = ground dynamic, peak-detecting, differential hall-effect gear-tooth sensors absolute maximum ratings over operating temperature range supply voltage, v cc ......................... 16 v* reverse supply voltage, v rcc ....... -0.5 v output off voltage, v out ................. 18 v reverse output voltage, v out ....... -0.5 v continuous output current, i out ... 25 ma minimum external capacitance, c 3 ............................................. 0.1 f package power dissipation, p d .................................... see graph operating temperature range, t a ........................... -40 c to +150 c* storage temperature, t s ............ +170 c * operation at increased supply voltages with external circuitry is described in applications information. devices for operation at increased temperatures are available on special order. ats610lsa and ATS611LSB preliminary information (subject to change without notice) december 2, 1998
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 both sensors are packaged in miniature plastic housings that have been optimized for size, ease of assembly, and manufacturability. high operating temperature materi- als are used in all aspects of construction. devices for operation at increased temperatures are also available on special order. ats610lsa: large-tooth, gear-position sensing crank angle, cam angle. ATS611LSB: fine-pitch, large air gap, gear-speed sensing transmission, abs. 600 400 200 40 80 120 160 0 ambient temperature in c allowable package power dissipation in mw dwg. gh-065 "sa" package r ja = 147 c/w "sb" package r ja ~ 150 c/w 60 100 140 180 20 800 1000 functional block diagram output capacitor 3 dwg. fh-014 supply ground reg + 1 2 4 power-on logic e2 uvlo + track & hold magnet e1 x x w copyright ? 1997, allegro microsystems, inc.
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors electrical characteristics over operating voltage and temperature range, c 3 = 0.1 f to 0.47 f. note: typical data is at v cc = 5 v and t a = +25 c and is for design information only. limits characteristic symbol test conditions min. typ. max. units supply voltage v cc operating, t j < 165 cv cc(uv) 16 v power-on state pos v cc = 0 5 v high high high under-voltage lockout v cc(uv) i out = 20 ma, v cc = 0 5 v 2.5 3.5 v under-voltage hysteresis v cc(hys) lockout (v cc(uv) ) shutdown 0.1 v output saturation voltage v out(sat) i out = 20 ma 90 400 mv output leakage current i off v out = 16 v 0.2 15 a supply current i cc output off 5.5 7.7 11 ma output on 8.5 10.5 13 ma power-on delay t on 200 s output rise time t r r l = 500 ? , c l = 10 pf 0.2 2.0 s output fall time t f r l = 500 ? , c l = 10 pf 0.2 2.0 s
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 ats610lsa operation over operating voltage and temperature range with reference target (unless otherwise specified). ATS611LSB operation over operating voltage and temperature range with reference target (unless otherwise specified). * the one-tooth (180 ) target is not recommended for use with the ATS611LSB. limits characteristic symbol test conditions min. typ. max. units air gap range ag operating, 0.4 2.25 mm target speed > 20 rpm minimum air gap ag min operating, one-tooth (180 ) 0.25 mm target, target speed = 1000 rpm maximum air gap ag max operating, one-tooth (180 ) 2.75 mm target, target speed = 1000 rpm timing accuracy t target speed = 1000 rpm, 0.5 1.0 0.4 mm ag 2 mm limits characteristic symbol test conditions min. typ. max. units air gap range ag operating, 0.4 2.5 mm target speed > 20 rpm minimum air gap ag min operating, one-tooth (180 ) 0.75 mm target*, target speed = 1000 rpm maximum air gap ag max operating, one-tooth (180 ) 3.25 mm target*, target speed = 1000 rpm timing accuracy t target speed = 1000 rpm, 0.5 1.0 0.4 mm ag 2 mm
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors reference target one-tooth (180 ) target dwg. mh-016 mm air gap t = 3 mm d = 115 mm o 3 mm target f (thickness) 3 mm e1 e2 sensor south north permanent magnet pole piece h = 5 mm t 1 2 3 4 dwg. mh-016-1 mm air gap h = 5 mm t target f (thickness) 3 mm e1 e2 sensor south north permanent magnet pole piece t = 180 (one tooth) d = 115 mm o 1 2 3 4
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 10 20 30 40 150 0 output sink current in ma 125 50 25 0 dwg. gh-059 output saturation voltage in mv 75 100 175 t = 25 c a typical ats610lsa and ATS611LSB electrical characteristics 0 40 80 120 160 12 ambient temperature in c 10 8.0 6.0 -40 dwg. gh-014-1 supply current in ma 200 11 9.0 7.0 14 4.0 output on output off v = 5 v cc 0 40 80 120 160 150 50 ambient temperature in c 125 100 75 -40 dwg. gh-013-1 output saturation voltage in mv 200 i = 20 ma out 12 supply voltage in volts 10 8.0 6.0 dwg. gh-058 supply current in ma 11 9.0 7.0 13 5.0 output on output off 2.0 6.0 10 14 18 t = 25 c a
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors 53.0 52.0 0.5 1.5 2.5 3.5 1.0 2.0 3.0 0 52.8 52.6 52.4 52.2 51.8 51.6 51.4 air gap in millimeters duty cycle in per cent dwg. gh-008-1 -40 c +25 c +150 c 1.5 0.5 1.5 2.5 3.5 1.0 2.0 3.0 0 3.0 2.5 2.0 1.0 0.5 0 air gap in millimeters relative accuracy in degrees dwg. gh-008 -40 c +25 c +150 c trailing target edge 1.5 0.5 1.5 2.5 3.5 1.0 2.0 3.0 0 3.0 2.5 2.0 1.0 0.5 0 air gap in millimeters relative accuracy in degrees dwg. gh-008-2 leading target edge -40 c +25 c +150 c continued next page typical ats610lsa operating characteristics (with reference target)
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 4.0 3.0 2.0 500 1500 2500 3500 1.0 reference target speed in rpm maximum air gap in millimeters dwg. gh-011 1000 2000 3000 3.5 2.5 1.5 0 -40 c +25 c +150 c 4.5 4.0 3.0 2.0 10 30 50 70 1.0 20 40 60 3.5 2.5 1.5 0 4.5 reference target speed in rpm maximum air gap in millimeters dwg. gh-011-1 -40 c +25 c +150 c typical ats610lsa operating characteristics (with reference target) continued typical ATS611LSB operating characteristics (with reference target) 4.0 3.0 2.0 500 1500 2500 3500 1.0 1000 2000 3000 3.5 2.5 1.5 0 4.5 reference target speed in rpm maximum air gap in millimeters dwg. gh-011-2 -40 c +25 c +150 c
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors device description the ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors are hall ic plus magnet subassemblies that are fully optimized to provide digital detection of gear-tooth edges in a small package size. both sensors are packaged in identical miniature plastic housings that have been optimized for size, ease of assembly, and manufacturability. high operating temperature materials are used in all aspects of construction. the application of these sensors is uncomplicated. after power is applied to the device, they are capable of quickly providing digital information that is representative of a rotating gear or specially designed target. no addi- tional optimization or processing circuitry is required. this ease of use should reduce design time and incremental assembly costs for most applications. sensing technology. both gear-tooth sensor subas- semblies contain a single-chip differential hall-effect sensor ic, a samarium-cobalt magnet, and a flat ferrous pole piece. the hall ic consists of two hall elements spaced 2.235 mm (0.088") apart, which sense the mag- netic gradient created by the passing of a ferrous object (a gear tooth). the two hall voltages are compared and the difference is then processed to provide a digital output signal. the processing circuit uses a patented peak-detection technique to eliminate magnet and system offsets. this technique allows coupling and filtering of offsets without the power-up and settling time disadvantages of classical high-pass filtering schemes. here, the peak signal of every tooth and valley is detected and is used to provide an instant reference for the operate-point and release- point comparators. in this manner, the thresholds are adapted and referenced to individual signal peaks and valleys, thereby providing immunity to zero-line variation due to installation inaccuracies (tilt, rotation, and off-center placement), as well as for variations caused by target and shaft eccentricities. the peak detection concept also allows extremely low-speed operation when used with small-value capacitors. dwg. wh-011 v out(sat) v bb output differential magnetic flux operate release operate release 0 power-on operation. the device will power on in the off state (output high) irrespective of the magnetic field condition. the power-on time of the circuit is no greater than 200 s. the circuit is then ready to accurately detect the first target edge that results in a high-to-low transi- tion. under-voltage lockout. when the supply voltage is below the minimum operating voltage (v cc(uv) ), the device is off and stays off irrespective of the state of the magnetic field. this prevents false signals, which may be caused by under-voltage conditions (especially during turn on), from appearing at the output. output. the device output is an open-collector stage capable of sinking 25ma. an external pull-up (resistor) to a supply voltage of not more than 18v must be supplied. superior performance. the ats610lsa and ATS611LSB peak-detecting differential gear-tooth sensor sub-assemblies have several advantages over conven- tional hall-effect gear-tooth sensors. continued next page
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 device description continued differential vs. single-element sensing. the differen- tial hall-element configuration is superior in most applica- tions to the classical single-element gear-tooth sensor. the single-element configuration commonly used (hall-effect sensor mounted on the face of a simple permanent magnet) requires the detection of a small signal (often <100g) that is superimposed on a large back-biased field, often 1500g to 3500g. for most gear/target configurations, the back-biased field values change due to concentration effects, resulting in a varying baseline with air gap, with valley widths, with eccentrici- ties, and with vibration. the differential configuration cancels the effects of the back-biased field and avoids many of the issues presented by the single hall element. note 10 g = 1 mt, exactly. peak-detecting vs. ac-coupled filters. high-pass filtering (normal ac coupling) is a commonly used tech- nique for eliminating circuit offsets. ac coupling has errors at power up because the filter circuit needs to hold the circuit zero value even though the circuit may power up over a large signal. such filter techniques can only perform properly after the filter has been allowed to settle, which is typically greater than one second. also, high- pass filter solutions cannot easily track rapidly changing baselines such as those caused by eccentricities. peak detection switches on the change in slope of the signal and is baseline independent at power up and during running. track-and-hold peak detecting vs. zero-crossing reference. the usual differential zero-crossing sensors are susceptible to false switching due to off-center and tilted installations, which result in a shift in baseline that changes with air gap. the track-and-hold peak-detection technique ignores baseline shifts versus air gaps and provides increased immunity to false switching. in addi- tion, using track-and-hold peak-detecting techniques, increased air gap capabilities can be expected because a peak detector utilizes the entire peak-to-peak signal range as compared to zero-crossing detectors that switch on fixed thresholds. note baseline refers to the zero-gauss differen- tial where each hall-effect element is subject to the same magnetic field strength. differential flux maps vs. air gaps single-element flux maps showing the impact of varying valley widths 10 20 30 60 1500 -1500 angle of target rotation in degrees 1000 -500 -1000 0 dwg. gh-061 differential magnetic field in gauss 0 500 t = 25 c a 50 40 target air gap = 2.5 mm air gap = 2.0 mm air gap = 1.5 mm air gap = 0.5 mm air gap = 1.0 mm 10 20 30 60 -2000 -5000 angle of target rotation in degrees -2500 -4000 -4500 0 dwg. gh-061-1 single element magnetic field in gauss -3500 -3000 t = 25 c a 50 40 target air gap = 2.5 mm air gap = 2.0 mm air gap = 1.5 mm air gap = 0.5 mm air gap = 1.0 mm
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors 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. criteria for device qualification qualification test test method and test conditions test length samples comments temperature humidity jesd22-a101, 1000 hrs 48 device biased for bias life t a = 85 c, rh = 85% minimum power bias life jesd22-a108, 1000 hrs 48 t a = 150 c, t j = 165 c (surge operating life) jesd22-a108, 168 hrs 24 t a = 175 c, t j = 190 c autoclave, unbiased jesd22-a102, 96 hrs 48 t a = 121 c, 15 psig high-temperature jesd22-a103, 1000 hrs 48 (bake) storage life t a = 170 c temperature cycle jesd22-a104 1000 cycles 60 esd, cdf-aec-q100-002 pre/post 3 per test to failure human body model reading test all leads > 3 kv
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 applications information gear diameter and pitch. signal frequency is a direct function of gear pitch and rotational speed (rpm). the width of the magnetic signal in degrees and, hence, the signal slope created by the tooth is directly proportional to the circumference of the gear ( d o ). smaller diameters limit the low-speed operation due to the slower rate of change of the magnetic signal per degree of gear rotation (here the limitation is the droop of the capacitor versus the signal change). larger diameters limit high-speed opera- tion due to the higher rate of change of magnetic signal per degree of rotation (here the limitation is the maximum charge rate of the capacitor versus the rate of signal change). these devices are optimized for a 50mm gear diameter (signal not limited by tooth width), 0.33 f capacitor, and speeds of 10 rpm to 8000 rpm. for very large diameter gears (diameter >200 mm), the devices must be configured with a lower value capacitor, but not less than 0.1 f. this allows for a range of 5:1 in gear diameters. note in application, the terms gear and target are often interchanged. however, gear is preferred when motion is transferred. air gap and tooth geometry. operating specifications are impacted by tooth width (t), valley width (p c - t) and depth (h t ), gear material, and gear face thickness (f). the target can be a gear or a specially cut shaft-mounted tone wheel made of stamped ferrous metal. in general, the following gear or target guidelines must be followed to achieve greater than 2mm air gap from the face of unit: tooth width, t .............................. >2 mm valley width, p c - t ...................... >2 mm (whole) depth, h t ......................... >3 mm gear material ............................... low-carbon steel gear face width (thickness), f .... >3 mm deviation from these guidelines will result in a reduc- tion of air gap and a deterioration in timing accuracy. for applications that require the sensing of large-tooth targets, the optimal sensor choice is the ats610lsa. here, the higher switching thresholds provide increased immunity to false switching caused by magnetic overshoot and other non-uniformities in the gear or target. for applications that require the sensing of a target with a repetitive target structure (valley width less than 5mm), the optimal sensor choice is the ATS611LSB. here, the lower switching thresholds make the device more sensitive to magnetic field changes and will provide larger operating air gaps. operation with fine-pitch gears. for targets with a circular pitch of less than 4mm, a performance improve- ment can be observed by rotating the front face of the sensor subassembly. this sensor rotation decreases the effective sensor-to-sensor spacing and increases the capability of detecting fine tooth or valley configurations, provided that the hall elements are not rotated beyond the width of the target. a dwg. mh-018-1 mm a 2.235 target face width, f >2.235 sin 2.235 cos continued next page signal timing accuracy. the magnetic field profile width is defined by the sensor element spacing and narrows in degrees as the target diameter increases. this results in improved timing accuracy performance for larger gear diameters (for the same number of gear teeth). the slope of this magnetic profile also changes with air gap, resulting in timing accuracy shift with air gap (refer to typical operating characteristic curves). valley-to-tooth transitions will generally provide better accuracy than tooth-to-valley transitions for large-tooth or large-valley configurations. for highest accuracy, targets greater than 100mm in diameter should be used.
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors applications information continued continued next page signal duty cycle. for repetitive target structures, precise duty cycle is maintained over the operating air gap and temperature range due to an extremely good symme- try in the magnetic switch points of the device. for nonrepetitive target structures, there will be a small but measureable change in pulse width versus air gap. output polarity. the output of the device will switch from high to low as the leading edge of the target passes the subassembly in the direction indicated below (pin 4 to pin 1), which means that the output will be low when the unit is facing a tooth. if rotation is in the opposite direction (pin 1 to pin 4), the output of the device will switch from low to high as the leading edge of the target passes the subassembly, which means that the output will be high when the unit is facing a tooth. dwg. ah-006-1 1 2 3 4 power supply protection. the sensor contains an on- chip voltage regulator and can operate over a wide supply voltage range. for devices that need to operate from an unregulated power supply, transient and double-battery protection should be added externally. for applications using a regulated supply, external emi/rfi protection is often required. insufficient protection can result in unex- plained pulses on the output line, providing inaccurate sensing information to the user. the filter capacitor and emi protection circuitry can easily be added to a pc board for use with these devices. provisions have been made for simple mounting of a board on the back of the unit. dwg. ah-007 1 2 3 4 operation from a regulated power supply. these devices require minimal protection circuitry during opera- tion from a low-voltage regulated line. the on-chip voltage regulator provides immunity to power supply variations between 3.5v and 16v. however, even while operating from a regulated line, some supply and output filtering is required to provide immunity to coupled and injected noise on the supply line. a basic rc low-pass circuit (r 1 c 1 ) on the supply line and an optional output capacitor (c 2 ) is recommended for operation in noisy environments. because the device has an open-collector output, an output pull-up resistor (r l ) must be included either at the sensor output (pin 2) or by the signal proces- sor input. 3 x x dwg. eh-008-1a + - 12 4 vcc 20 ? r l 0.033 f 0.22 f 100 pf output supply c 3 c 2 c 1 r 1
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 applications information continued capacitor requirements. the choice of the capacitor at pin 3 (c 3 ) defines the minimum operating speed of the target. this capacitor (0.1 f minimum) is required to stabilize the internal amplifiers as well as to eliminate the signal offsets. typically, a 0.33 f low-leakage ceramic capacitor is recommended. values greater than 0.47 f should not be used as this may cause high-speed perfor- mance degradation. capacitor leakage current at pin 3 will cause degrada- tion in the low-speed performance of the device. excess capacitor leakage can result in the sensor changing output state without movement of the gear tooth being sensed. in addition to the capacitor leakage, it is extremely impor- tant to minimize the leakage at the pc board and between the pins of the sensor. up to 50na of external leakage can be tolerated at the capacitor pin node to ground. choice of low-leakage-current potting compounds and the use of clean pc board techniques are extremely impor- tant. operation from an unregulated power supply. in automotive applications, where the device receives its power from an unregulated supply such as the battery, full protection is generally required so that the device can withstand the many supply-side transients. specifications for such transients vary between car manufacturers, and protection-circuit design should be optimized for each application. in the circuit below, a simple zener-controlled regulator is constructed using discrete components. the rc low-pass filter on the supply line (r 1 c 1 ) and a low-value supply bypass capacitor (c s ) can be included, if necessary, so as to minimize susceptibility to emi/rfi. the npn transistor should be chosen with sufficiently high forward breakdown voltage so as to withstand supply-side transients. the series diode should be chosen with sufficiently high reverse breakdown capabilities so as to withstand the most negative tran- sient. the current-limiting resistor (r z ) and the zener diode should be sized for power dissipation requirements. 3 x x + - 12 4 vcc dwg. eh-008a 20 ? r l 0.033 f 0.22 f 100 pf output supply 0.033 f 2.5 k ? 6.8 v c 3 c 2 c 1 r 1 r z c s additional applications information on gear-tooth and other hall-effect sensors is provided in the allegro elec- tronic data book ams-702 or application note 27701.
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors mechanical information continued next page sensor location (in millimeters) (sensor location relative to package center is the design objective) 0.41 0.38 0.0076 min. plating thickness dwg. mh-019 mm lead cross-section (in millimeters) component material function units sensor face thermoset epoxy maximum temperature 170 c* plastic housing thermoplastic pbt, 264 psi deflection temp. (dtul) 204 c 30% glass filled 66 psi deflection temp. (dtul) 216 c approximate melting temperature 225 c leads copper lead pull 8 n lead finish 90/10 tin/lead solder plate ? flame class rating ul94v-0 *temperature excursions to 225 c for 2 minutes or less are permitted. ? 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. dwg. mh-018 mm a 2.235 0.1 1.1
ats610lsa and ATS611LSB dynamic, peak-detecting, differential hall-effect gear-tooth sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 a dwg. mh-017a mm 1 2 3 4 9.0 8.3 8.0 see note 2.0 7.25 5.00 9.0 0.9 dia 3.0 nom 0.38 3.9 0.41 1.27 typ ats610lsa dimensions in millimeters ATS611LSB dimensions in millimeters 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 responsi- bility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. 2.0 a dwg. mh-017-1b mm 1 2 3 4 8.96 8.09 8.8 7.0 7.0 0.9 dia 3.0 nom 0.38 3.9 0.41 1.27 typ tolerances unless otherwise specified:1 place 0.1 mm, 2 places 0.05 mm. note nominal dimension and tolerances dependent on package material. contact factory.

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