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USB2SER 数据表(PDF) 5 Page - Freescale Semiconductor, Inc |
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USB2SER 数据表(HTML) 5 Page - Freescale Semiconductor, Inc |
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5 / 28 page  Pins and Connections USB2SER Data Sheet, Rev. 0 Freescale Semiconductor 5 1.3 Recommended system connections Figure 3. System connections working at 5 V Figure 4. System connections working at 3 V 1 RC filter on RESET is recommended for EMC-sensitive applications. 2 RPUDP is shown for full-speed USB only. The diagram shows a configuration where the on-chip regulator and RPUDP are enabled. The voltage regulator output is used for RPUDP. RPUDP can optionally be disabled if using an external pullup resistor on USBDP. 3 VBUS is a 5.0 V supply from upstream port that can be used for USB operation. 4 USBDP and USBDN are powered by the 3.3 V regulator. 5 When using internal VUSB33 as supply, there needs to be an external cap. |
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