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L99LD01 数据表(PDF) 21 Page - STMicroelectronics |
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L99LD01 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 69 page  DocID025319 Rev 3 21/69 L99LD01 Functional description 68 So in this case the LED driver goes: • In stand-by mode with a low level on ENABLE pin operated by the microcontroller • In normal mode with a high level on ENABLE pin operated by the microcontroller The inverted FSO signal, coming from the power management device ensures, putting trough the inverter and the external OR diode ENABLE pin high, that the LED driver correctly restarts even if the microcontroller fails. Figure 9. Operation with a standalone LIN and ENABLE Figure 10. Operation with PM device and ENABLE (FSO active Low) 1. An inverter network is required. 2.2.9 Frequency setting and dither effect The internal main converter oscillator structure is reported in Figure 11. |
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