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ATS610LSA Datasheet(PDF) 11 Page - Allegro MicroSystems |
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ATS610LSA Datasheet(HTML) 11 Page - Allegro MicroSystems |
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11 / 16 page  ATS610LSA AND ATS611LSB DYNAMIC, PEAK-DETECTING, DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSORS 11 www.allegromicro.com 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 ( πDo). 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 50 mm gear diameter (signal not limited by tooth width), 0.33 µF 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 µF. 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 (pc - T) and depth (ht), 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 2 mm air gap from the face of unit: Tooth width, T .............................. >2 mm Valley width, pc - T ...................... >2 mm (Whole) depth, ht ......................... >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 5 mm), 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 4 mm, a performance improve- ment can be observed by rotating the front face of the sensor module. 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. Dwg. MH-018-1 mm A 2.235 α TARGET FACE WIDTH, F >2.235 SIN α 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 100 mm in diameter should be used. |
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