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ATS674LSETN-HT-T Datasheet(PDF) 11 Page - Allegro MicroSystems |
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ATS674LSETN-HT-T Datasheet(HTML) 11 Page - Allegro MicroSystems |
11 / 19 page Self-Calibrating TPOS Gear Tooth Sensor Optimized for Automotive Cam Sensing Applications ATS673 and ATS674 11 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com AGC (Automatic Gain Control) The AGC feature is implemented by a unique patented self- calibrating circuitry. After each power-on, the devices measure the peak-to-peak magnetic signal. The gain of the sensor is then adjusted, keeping the internal signal amplitude constant over the air gap range of the device. This feature ensures that operational characteristics are isolated from the effects of changes in AG. The effect of AGC is shown in figure 7. Magnetic Flux Density Versus Target Edge Position 0 1020 30405060 708090 Target Rotation (°) 0 100 200 300 400 500 600 1.50 AG (mm): 2.00 2.50 3.00 3.50 Target Rotation (°) Internal Analog Signal after AGC Versus Target Edge Position 0 10 203040 506070 8090 0 0.5 1.0 1.5 2.0 1.50 AG (mm): 2.00 2.50 3.00 3.50 Figure 7. Effect of AGC. The upper panel shows the magnetic gradient detected at the Hall element, with no amplification. The lower panel displays the corresponding internal processed signal, VPROC. This normalized electrical signal allows optimal performance by the rest of the circuits that reference this signal. |
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