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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TMD4903 датащи(PDF) 71 Page - OSRAM GmbH |
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TMD4903 датащи(HTML) 71 Page - OSRAM GmbH |
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71 / 86 page  Page 70 Datasheet, Public Document Feedback [v2-00] 2022-Nov-03 TMD4903 − Application Information Electrical and Optical Output The electrical or optical output of the remote control engine can be realized in three ways: use of the integrated top-facing LED, use of the LDR pin to directly drive an external LED, or use of the GPIO pin to drive an external FET and IR LED. The LDR pin has a regulated current sink with selectable drive value. This is an attractive way to use an external LED without having an additional LED drive FET. If this method is to be used, then LEDA must be disconnected from the circuit. Since the cathode of the integrated LED is connected to the LDR pin internal to the module any current that is sourced through LEDA will reduce the current available on the external remote control LED. When the remote control functionality is not used the external LED must be electrically disconnected from the LDR pin to prevent it from illuminating. Figure 81: External IR LED Using the LDR Pin Recommended Connection: Option number one. If the LDR pin is not used as the pattern output, the GPIO pin can be used. With this method both the LEDA and external remote control IR LED may remain connected to the LED power supply, but an additional FET is needed to drive the remote control LED. TMD4903 1 2 3 4 5 VDD GND LEDA INT SCL SDA 7 8 LDR 1µF 1µF >4.7µF 22Ω µP VDD VBUS 6 Remote Control Circuit Option #1 GPIO VDD VLED µP VLED |
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