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ATS645LSH Datasheet(PDF) 9 Page - Allegro MicroSystems |
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ATS645LSH Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 14 page True Zero Speed Miniature Differential Peak- Detecting Gear Tooth Sensor ATS645LSH 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Automatic Gain Control (AGC) This feature allows the device to operate with an optimal internal electrical signal, regardless of the air gap (within the AG speci- fication). During calibration, the device determines the peak-to- peak amplitude of the signal generated by the target. The gain of the sensor is then automatically adjusted. Figure 5 illustrates the effect of this feature. Automatic Offset Adjust (AOA) The AOA is patented circuitry that automatically cancels the effects of chip, magnet, and installation offsets. (For capability, see Dynamic Offset Cancellation, in the Operating Characteris- tics table.) This circuitry is continuously active, including both during calibration mode and running mode, compensating for any offset drift. Continuous operation also allows it to compen- sate for offsets induced by temperature variations over time. Digital Peak Detection A digital DAC tracks the internal analog voltage signal VPROC, and is used for holding the peak value of the internal analog signal. In the example shown in figure 6, the DAC would first track up with the signal and hold the upper peak’s value. When VPROC drops below this peak value by BOP, the device hyster- esis, the output would switch and the DAC would begin tracking the signal downward toward the negative VPROC peak. Once the DAC acquires the negative peak, the output will again switch states when VPROC is greater than the peak by the value BRP. At this point, the DAC tracks up again and the cycle repeats. The digital tracking of the differential analog signal allows the sensor to achieve true zero-speed operation. Figure 5. Automatic Gain Control (AGC). The AGC function corrects for variances in the air gap. Differences in the air gap affect the magnetic gradient, but AGC prevents that from affecting device performance, a shown in the lowest panel. Mechanical Profile AGSmall AGLarge AGSmall AGLarge Internal Differential Analog Signal Response, with AGC Internal Differential Analog Signal Response, without AGC Ferrous Target V+ V+ Figure 6: Peak Detecting Switchpoint Detail Device Output Current BRP Internal Differential Analog Signal V+ I+ BOP |
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