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USB2517 数据表(PDF) 11 Page - Microchip Technology |
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USB2517 数据表(HTML) 11 Page - Microchip Technology |
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11 / 58 page ![]() 2013-2016 Microchip Technology Inc. DS00001598B-page 11 USB2517/USB2517I LED_A[7:1]_N/ PRT_SWP[7:1] 15 17 31 33 47 49 51 I/O12 Port LED Indicators & Port Swap strapping option Indicator LED for ports 1-7. Will be active low when LED support is enabled via EEPROM or SMBus. If this strap is enabled by package and configuration settings (see Table 5-2), this pin will be sampled at RESET_N negation to deter- mine the electrical connection polarity of the downstream USB Port pins (USB_DP and USB_DM). Also, the active state of the LED will be determined as follows: ‘0’ = Port Polarity is normal, LED is active high. ‘1’ = Port Polarity (USB_DP and USB_DM) is swapped, LED is active low. LED_B[7:4]_N 14 16 18 32 I/O12 Enhanced Indicator Port 4-7 LED Enhanced Indicator LED for ports 4-7. Will be active low when LED support is enabled via EEPROM or SMBus. LED_B3_N/ GANG_EN 34 I/O12 Enhanced Port 3 LED, Gang Power, and Over-current Strap Option Enhanced Indicator LED for port 3. Will be active low when LED support is enabled via EEPROM or SMBus. GANG_EN: Selects between Gang or Individual Port power and Over-current sensing. If this strap is enabled by package and configuration settings (see Table 5-2), this pin will be sampled at RESET_N negation to deter- mine the mode as follows: ‘0’ = Individual sensing & switching, and LED_B3_N is active high. ‘1’ = Ganged sensing & switching, and LED_B3_N is active low. TABLE 5-1: USB2517/USB2517I PIN DESCRIPTIONS (CONTINUED) Symbol 64 QFN Buffer Type Description |
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