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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP5526TL датащи(PDF) 13 Page - National Semiconductor (TI) |
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LP5526TL датащи(HTML) 13 Page - National Semiconductor (TI) |
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13 / 33 page  Functionality of Color LED Outputs (RLED, GLED, BLED) (Continued) Overlapping Mode In overlapping mode the brightness is controlled using PWM duty cycle based control method as the following figure shows. 20179787 Overlapping Mode Since RGB outputs are on simuneltaneously, the maximum load peak current is: I MAX = I(RLED)MAX + I(GLED)MAX + I(BLED)MAX Non-Overlapping Mode The timing diagram shows the splitted R, G and B and brightness control effect to splitted parts. Full brightness is used in the diagram. If for example 1⁄2 brightness is used, the frame is still 50µs, but all LED outputs’ ON time is 50% shorter and at the last 25µs all LED outputs are OFF. 20179788 Non-Overlapping Mode The non-overlapping mode has 16 programmed colors (dif- ferent R, G and B ratio -> different color). Since the R, G and B are split in to non-overlapping slots the output current through the RGB LED can be calculated with following equa- tion: I AVG=(CRxIR+CGxIG+CBxIB)xB where C = Color [%] (see table of color control) B = Brightness [%] (see table of brightness control) 2. LED ON/OFF CONTROL WITH RGB CONTROL REGISTER Each LED output can be set ON by writing the corresponding bit high in the Control register (00H). RSW controls RLED, GSW controls GLED and BSW controls BLED output. Note that EN_RGB bit must be high and RGB_PWM bit low. In this mode, the RGB register (01H) does not have any effect. CC_SW bit in Control register defines the LED output mode. www.national.com 13 |
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