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ATS632LSC Datasheet(PDF) 8 Page - Allegro MicroSystems |
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ATS632LSC Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 12 page ATS632LSC HALL-EFFECT GEAR-TOOTH SENSOR SUBASSEMBLY 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 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-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 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. APPLICATIONS INFORMATION — Continued 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 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 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. |
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