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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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USB2514 датащи(PDF) 23 Page - Microchip Technology |
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USB2514 датащи(HTML) 23 Page - Microchip Technology |
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23 / 63 page  USB 2.0 Hi-Speed Hub Controller Datasheet SMSC USB251xB/xBi 23 Revision 2.2 (02-17-12) DATASHEET 3.3.1.3 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 3.6 LED Pin Strap Example 3.4 Buffer Type Descriptions Table 3.5 Buffer Type Descriptions BUFFER TYPE DESCRIPTION I Input I/O Input/output IPD Input with internal weak pull-down resistor IPU Input with internal weak pull-up resistor IS Input with Schmitt trigger O12 Output 12 mA I/O12 Input/output buffer with 12 mA sink and 12 mA source I/OSD12 Open drain with Schmitt trigger and 12 mA sink. Meets the I2C-Bus Specification [2] requirements. ICLKx XTAL clock input OCLKx XTAL clock output I-R RBIAS I/O-U Analog input/output defined in USB specification HUB HUB Strap Pin LED/ Strap High Strap Pin LED/ Strap Low R k Ω R k Ω +V |
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