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ATS612LSB Datasheet(PDF) 9 Page - Allegro MicroSystems |
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ATS612LSB Datasheet(HTML) 9 Page - Allegro MicroSystems |
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9 / 17 page  115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ATS612LSB DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING, DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR 8 Dwg. WH-011 V OUT(SAT) V BB OPERATE RELEASE OPERATE RELEASE 0 The ATS612LSB gear-tooth sensor system is a Hall IC/magnet configuration that is fully optimized to provide digital detection of gear-tooth edges in a small package size. This device contains self-calibrating circuitry that nulls out the effect of air gap variations on the switching accuracy of the device. A high startup hysteresis mini- mizes false switching caused by magnetic overshoot. The sensor is packaged in a miniature plastic housing that has been optimized for size, ease of assembly, and manufacturability. High operating temperature materials are used in all aspects of construction. The use of this sensor is simple; after correct power is applied to the component, it is capable of instantly providing digital information that is representative of the profile of a rotating gear. No additional optimization or processing circuitry is required. This ease of use should reduce design time and incremental assembly costs for most applications. Sensing Technology. This gear-tooth sensor module contains 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 located so as to measure the magnetic gradient created by the passing of a ferrous object (a gear). The two elements measure the field gradient and convert it to voltage which is then subtracted and processed in order to provide a digital output signal. The processing circuit uses a patented peak detec- tion scheme to eliminate magnet and system offsets. This technique allows dynamic coupling and filtering of offsets without the power-up and settling time disadvantages of classical high-pass filtering schemes. The peak signal of every tooth and valley is detected by the filter and is used to provide an instant reference for the operate and release point comparator. In this manner, the thresholds are adapted and referenced to individual signal peaks and valleys, hence 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 for small value filter capacitors. DEVICE DESCRIPTION The ATS612LSB also includes self-calibration circuitry that is engaged at power on. The signal ampli- tude is measured and the device gain is normalized. In this manner, switch-point drift versus air gap is minimized and excellent timing accuracy can be achieved. The AGC circuitry, in conjunction with a unique hysteresis circuit, also eliminates the effect of gear edge overshoot as well as increases the immunity to false switching caused by gear tooth anomalies at close air gap. The AGC circuit sets the gain of the device after power on. Up to 0.25 mm air gap change can occur after calibration is complete without significant performance impact. Superior Performance. The ATS612LSB peak-detecting differential gear-tooth sensor module has several advan- tages over conventional Hall-effect gear-tooth sensors. The signal-processing techniques used in the ATS612LSB peak-detecting differential gear-tooth sensor solve the catastrophic issues that affect the functionality of conven- tional digital gear-tooth sensors. • Temperature drift. Changes in temperature do not greatly affect this device due to the stable amplifier design and the offset rejection circuitry. • Timing accuracy variation due to air gap. The accuracy variation caused by air gap changes is minimized by the self calibration circuitry. A 2x-to-3x improvement can be seen. • Dual edge detection. Because this device switches from the positive and negative peaks of the signal, dual edge detection is guaranteed. |
Similar Part No. - ATS612LSB_1 |
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Similar Description - ATS612LSB_1 |
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