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ATS611LSB Datasheet(PDF) 10 Page - Allegro MicroSystems |
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ATS611LSB Datasheet(HTML) 10 Page - Allegro MicroSystems |
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10 / 16 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 10 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 <100 G) that is superimposed on a large back-biased field, often 1500 G to 3500 G. 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 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 -3500 -3000 T = 25 °C A 50 40 TARGET AIR GAP = 0.5 mm AIR GAP = 1.0 mm AIR GAP = 1.5 mm AIR GAP = 2.5 mm AIR GAP = 2.0 mm |
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