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ATS612LSB Datasheet(PDF) 11 Page - Allegro MicroSystems |
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ATS612LSB Datasheet(HTML) 11 Page - Allegro MicroSystems |
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11 / 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 10 DEVICE DESCRIPTION — Continued 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 on because the filter circuit needs to hold the circuit zero value even though the circuit may power on 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 eccentrici- ties. Peak detection switches on the change in slope of the signal and is baseline independent at power up and during running. 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 addition, 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 one-half the peak-to-peak signal. NOTE — “Baseline” refers to the zero-gauss differential where each Hall-effect element is subject to the same magnetic field strength. Power-On Operation. The device will power on in the OFF state (output high) irrespective of the magnetic field condition. The power-up time of the circuit is no greater than 500 µs. 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 (VCC(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 up to 20mA. An external pull-up (resistor) to a supply voltage of not more than 24V must be supplied. |
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