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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TCS37727FN датащи(PDF) 19 Page - OSRAM GmbH |
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TCS37727FN датащи(HTML) 19 Page - OSRAM GmbH |
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19 / 51 page  Page 18 ams Datasheet Document Feedback [v1-01] 2018-Mar-14 TCS3772 − Principles of Operation Proximity Detection Proximity detection is accomplished by measuring the amount of light energy, generally from an IR LED, reflected off an object to determine its distance. The proximity light source, which is external to the TCS3772 device, is driven by the integrated proximity LED current driver. Figure 24: Proximity Detection The LED current driver, output on the LDR terminal, provides a regulated current sink that eliminates the need for an external current limiting resistor. PDRIVE sets the drive current to 100 mA, 50 mA, 25 mA. To drive an external light source with more than 100 mA or to minimize on-chip ground bounce, LDR can be used to drive an external p-type transistor, which, in turn, drives the light source. Referring to the Detailed State Machine figure, the LED current driver pulses the external IR LED as shown in Figure 25 during the Prox Accum state. Figure 25 also illustrates that the LED On pulse has a fixed width of 6.3 μs and period of 14.0 μs. So, in addition to setting the proximity drive current, 1 to 255 proximity pulses (PPULSE) can be programmed. When deciding on the number of proximity pulses, keep in mind that the signal increases proportionally to PPULSE, while noise increases by the square root of PPULSE. |
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