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USB5744 数据表(PDF) 13 Page - Microchip Technology |
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USB5744 数据表(HTML) 13 Page - Microchip Technology |
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13 / 49 page  2015-2016 Microchip Technology Inc. DS00001855D-page 13 USB5744 Note 3: Configuration strap values are latched on Power-On Reset (POR) and the rising edge of RESET_N (external chip reset). Configuration straps are identified by an underlined symbol name. Signals that function as con- figurations traps must be augmented with an external resistor when connected to a load. Refer to Section 3.4, "Configuration Straps and Programmable Functions" for additional information. 1 PRT_CTL3 I (PU) Port 3 Power Enable / Overcurrent Sense. As an output, this signal is an active high control signal used to enable power to the downstream port 3. As an input, this signal indicates an overcurrent condition from an external current monitor on USB port 3. 1 PRT_CTL4 I (PU) Port 4 Power Enable / Overcurrent Sense. As an output, this signal is an active high control signal used to enable power to the downstream port 4. As an input, this signal indicates an overcurrent condition from an external current monitor on USB port 4. GANG_PWR I (PU) When pulled high enables gang mode. Gang power pin when used in gang mode. TABLE 3-6: SPI/SMBUS PIN DESCRIPTIONS Num Pins Symbol Buffer Type Description 1 SPI_CE_N O12 Active low SPI chip enable output. GPIO7 I/O12 General purpose input/output 7. CFG_NON_REM I Non-Removable Port Configuration Strap. This configuration strap is used to configure the number of non- removable ports. Refer to Section 3.4.3, "Non-Removable Port Con- figuration (CFG_NON_REM)" for more information. See Note 3. 1 SPI_CLK O6 SPI clock output to the serial ROM, when configured for SPI opera- tion. SMCLK OD12 SMBus clock pin, when configured for SMBus slave operation. GPIO4 I/O6 General purpose input/output 4. 1 SPI_DO O6 SPI data output, when configured for SPI operation. SMDAT I/O12 SMBus data pin, when configured for SMBus slave operation. GPIO5 I/O6 General purpose input/output 5. 1 SPI_DI IS SPI data input, when configured for SPI operation. GPIO9 I/O12 General purpose input/output 9. CFG_BC_EN I Battery Charging Configuration Strap. This configuration strap is used to enable battery charging. Refer to Section 3.4.4, "Battery Charging Configuration (CFG_BC_EN)" for more information. See Note 3. TABLE 3-5: USB PORT CONTROL PIN DESCRIPTIONS (CONTINUED) Num Pins Symbol Buffer Type Description |
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