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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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USB2422T/MJ датащи(PDF) 15 Page - SMSC Corporation |
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USB2422T/MJ датащи(HTML) 15 Page - SMSC Corporation |
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15 / 51 page  2-Port USB 2.0 Hi-Speed Hub Controller Datasheet SMSC USB2422 15 Revision 1.0 (06-04-13) DATASHEET 2.5.2 Internal Pull-Down (IPD) If a strap pin’s buffer type is IPD, one of the two hardware configurations outlined in Figure 2.3 must be implemented. Use the Strap High configuration to set the strap option value to 1 and Strap Low to set the strap option value to 0. Figure 2.3 IPD Pin Strap Example 2.5.3 LED If a strap pin’s buffer type is I/O and shares functionality with an LED, the hardware configuration outlined below must be implemented. The internal logic will drive the LED appropriately (active high or low) depending on the sampled strap option. Use the Strap High configuration to set the strap option value to 1 and Strap Low to set the strap option to 0. Figure 2.4 LED Pin Strap Example HUB HUB IPD Strap Pin Strap High R k Ω +V VSS IPD Strap Pin Strap Low VSS HUB Strap Pin LED/ Strap High HUB Strap Pin LED/ Strap Low R k Ω R k Ω |
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