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ATS616LSG Datasheet(PDF) 11 Page - Allegro MicroSystems |
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ATS616LSG Datasheet(HTML) 11 Page - Allegro MicroSystems |
11 / 14 page 11 ATS616LSG-DS, Rev. 1 Worcester, Massachusetts 01615-0036 (508) 853-5000 115 Northeast Cutoff, Box 15036 www.allegromicro.com Allegro MicroSystems, Inc. Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect Gear Tooth Sensor ATS616LSG Peak Detecting vs. AC-Coupled Filters. High-pass filtering (normal ac coupling) is a commonly used technique for eliminat- ing circuit offsets. However, 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 filtering techniques can only perform properly after the filter has been allowed to settle, which typically takes longer than 1s. Also, high-pass filter solutions cannot easily track rapidly chang- ing baselines, such as those caused by eccentricities. (The term baseline refers to a 0 G differential field, where each Hall-effect element is subject to the same magnetic field strength; see figure 3.) In contrast, peak detecting designs switch at the change in slope of the differential signal, and so are baseline-independent both at power-on and while running. Peak Detecting vs. Zero-Crossing Reference. The usual dif- ferential zero-crossing sensors are susceptible to false switching due to off-center and tilted installations that result in a shift of the 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 detection techniques, increased air gap capabilities can be expected because peak detection utilizes the entire peak-to-peak signal range, as compared to zero-cross- ing detectors, which switch at half the peak-to-peak signal. Power-On Operation. The device powers-on in the Off state (output voltage high), irrespective of the magnetic field condi- tion. 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 transition of the device output. Undervoltage Lockout (UVLO). When the supply voltage, VCC, 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 undervolt- age conditions (especially during power-up), from appearing at the output. Output. The device output is an open-collector stage capable of sinking up to 20 mA. An external pull-up (resistor) must be sup- plied to a supply voltage of not more than 24 V. Output Polarity. The output of the unit will switch from low to high as the leading edge of a tooth passes the branded face of the sensor in the direction indicated in figure 6. This means that in such a configuration, the output voltage will be high when the sensor is facing a tooth. If the target rotation is in the oppo- site direction relative to the sensor, the output polarity will be opposite as well, with the unit switching from low to high as the leading edge passes the unit. of Sensor Rotating Target Branded Face 1 4 Figure 6. This left-to-right (pin 1 to pin 4) direction of target rotation results in a high output signal when a tooth of the target gear is nearest the branded face of the sensor. A right-to-left (pin 4 to pin 1) rotation inverts the output signal polarity. Figure 7. The magnetic profile reflects the geometry of the target, allowing the device to present an accurate digital output response. Target Mechanical Profile Target Magnet ic Profile Sensor Out put Elect rical Profile Target Motion from Pin 1 to Pin 4 Sensor Out put Elect rical Profile Target Motion from Pin 4 to Pin 1 Signature Tooth B+ B IN V+ V OUT V+ V OUT Sensor Output Switch State On Off On Off On Off On Off On Off On Off On Off On Off |
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