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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TSL27715FN датащи(PDF) 18 Page - OSRAM GmbH |
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TSL27715FN датащи(HTML) 18 Page - OSRAM GmbH |
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18 / 51 page  ams Datasheet Page 17 [v1-00] 2016-Mar-22 Document Feedback TSL2771 − Principles Of Operation Proximity Detection Proximity sensing uses an external light source (generally an infrared emitter) to emit light, which is then viewed by the integrated light detector to measure the amount of reflected light when an object is in the light path (Figure 19). The amount of light detected from a reflected surface can then be used to determine an object’s proximity to the sensor. Figure 19: Proximity Detection The device has controls for the number of IR pulses (PPCOUNT ), the integration time (PTIME), the LED drive current (PDRIVE), and the photodiode configuration (PDIODE) (Figure 20). The photodiode configuration can be set to CH1 diode (recommended), CH0 diode, or a combination of both diodes. At the end of the integration cycle, the results are latched into the proximity data (PDATA) register. Figure 20: Proximity Detection Operation IR LED Prox Sensor Surface Reflectivity (SR) Background Energy (BGE) Optical Crosstalk (OC) Glass Attenuation (GA) Distance (D) CH1 Prox Integration Prox Control Prox ADC IR LED Constant Current Sink CH0 PDATAH(r 0x019), PDATAL(r 0x018) PDRIVE(r 0x0F, b7:6) Prox Data IR LED PTIME(r 2) PPCOUNT(r 0x0E) VDD |
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