Catalog
7-Port Full-Speed 12Mbps USB 2.0 Hub
Key Features
• Fully Compliant With the USB Specification as aFull-Speed Hub: TID #20240226Integrated USB Transceivers3.3-V Low-Power ASIC LogicTwo Power Source ModesSelf-Powered Mode Supporting SevenDownstream PortsBus-Powered Mode Supporting FourDownstream PortsAll Downstream Ports Support Full-Speed andLow-Speed OperationsPower Switching and Overcurrent Reporting IsProvided Ganged or Per PortSupports Suspend and Resume OperationsSuspend Status Pin Available for External LogicPower DownSupports Custom Vendor ID and Product ID WithExternal Serial EEPROM3-State EEPROM Interface Allows EEPROMSharingPush-Pull Outputs forPWRONEliminate the Needfor External Pullup ResistorsNoise Filtering onOVRCURProvides Immunity toVoltage SpikesSupports 6-MHz Operation Through a CrystalInput or a 48-MHz Input ClockNew Functional Pins Introduced to Reduce theBoard Material Cost3 LED Indicator Control Outputs EnableVisualized Monitoring of 6 Different Hub/PortStatus (HUBCFG, PORTPWR, PORTDIS)Output Pin Available to Disable External PullupResistor on DP0 for 15 ms After Reset or AfterChange onBUSPWRand Enable EasyImplementation of Onboard Bus/Self-PowerDynamic Switching CircuitryNo Special Driver Requirements; WorksSeamlessly With Any Operating System With USBStack SupportAvailable in 48-Pin LQFP PackageJEDEC Descriptor S–PQFP–G for Low-ProfileQuad Flatpack (LQFP).Fully Compliant With the USB Specification as aFull-Speed Hub: TID #20240226Integrated USB Transceivers3.3-V Low-Power ASIC LogicTwo Power Source ModesSelf-Powered Mode Supporting SevenDownstream PortsBus-Powered Mode Supporting FourDownstream PortsAll Downstream Ports Support Full-Speed andLow-Speed OperationsPower Switching and Overcurrent Reporting IsProvided Ganged or Per PortSupports Suspend and Resume OperationsSuspend Status Pin Available for External LogicPower DownSupports Custom Vendor ID and Product ID WithExternal Serial EEPROM3-State EEPROM Interface Allows EEPROMSharingPush-Pull Outputs forPWRONEliminate the Needfor External Pullup ResistorsNoise Filtering onOVRCURProvides Immunity toVoltage SpikesSupports 6-MHz Operation Through a CrystalInput or a 48-MHz Input ClockNew Functional Pins Introduced to Reduce theBoard Material Cost3 LED Indicator Control Outputs EnableVisualized Monitoring of 6 Different Hub/PortStatus (HUBCFG, PORTPWR, PORTDIS)Output Pin Available to Disable External PullupResistor on DP0 for 15 ms After Reset or AfterChange onBUSPWRand Enable EasyImplementation of Onboard Bus/Self-PowerDynamic Switching CircuitryNo Special Driver Requirements; WorksSeamlessly With Any Operating System With USBStack SupportAvailable in 48-Pin LQFP PackageJEDEC Descriptor S–PQFP–G for Low-ProfileQuad Flatpack (LQFP).
Description
AI
The TUSB2077A hub is a 3.3-V CMOS device that provides up to seven downstream ports in compliance with the USB 2.0 specification. Because this device is implemented with a digital state machine instead of a microcontroller, no software programming is required. Fully compliant USB transceivers are integrated into the ASIC for all upstream and downstream ports. The downstream ports support full-speed and low-speed devices by automatically setting the slew rate according to the speed of the device attached to the ports. The configuration of theBUSPWRterminal selects either the bus-powered or self-powered mode. The introduction of the DP0 pull-up resistor disable terminal, DP0PUR, makes it much easier to implement an onboard bus/self-power dynamic-switching circuitry. The three-LED indicator control output pins also enable the implementation of visualized status monitoring of the hub and its downstream ports. With these new function pins, the end equipment vendor can considerably reduce the total board cost while adding additional product value.
TheEXTMEMpin (pin 47) enables or disables the optional EEPROM interface. WhenEXTMEMis high, the vendor and product IDs (VID and PID) use defaults, such that the message displayed during enumeration is General Purpose USB Hub.
The TUSB2077A supports bus-powered and self-powered modes. External power-management devices, such as the TPS2044, are required to control the 5-V power source switching (on/off) to the downstream ports and to detect an overcurrent condition from the downstream ports individually or ganged. An individually port power controlled hub switches power on or off to each downstream port as requested by the USB host. Also when an individually port power controlled hub senses an overcurrent event, only power to the affected downstream port will be switched off. A ganged hub switches on power to all its downstream ports when power must be on for any port. The power to the downstream ports is not switched off unless all ports are in a state that allows power to be removed. Also, when a ganged hub senses an overcurrent event, power to all downstream ports will be switched off.
The TUSB2077A hub is a 3.3-V CMOS device that provides up to seven downstream ports in compliance with the USB 2.0 specification. Because this device is implemented with a digital state machine instead of a microcontroller, no software programming is required. Fully compliant USB transceivers are integrated into the ASIC for all upstream and downstream ports. The downstream ports support full-speed and low-speed devices by automatically setting the slew rate according to the speed of the device attached to the ports. The configuration of theBUSPWRterminal selects either the bus-powered or self-powered mode. The introduction of the DP0 pull-up resistor disable terminal, DP0PUR, makes it much easier to implement an onboard bus/self-power dynamic-switching circuitry. The three-LED indicator control output pins also enable the implementation of visualized status monitoring of the hub and its downstream ports. With these new function pins, the end equipment vendor can considerably reduce the total board cost while adding additional product value.
TheEXTMEMpin (pin 47) enables or disables the optional EEPROM interface. WhenEXTMEMis high, the vendor and product IDs (VID and PID) use defaults, such that the message displayed during enumeration is General Purpose USB Hub.
The TUSB2077A supports bus-powered and self-powered modes. External power-management devices, such as the TPS2044, are required to control the 5-V power source switching (on/off) to the downstream ports and to detect an overcurrent condition from the downstream ports individually or ganged. An individually port power controlled hub switches power on or off to each downstream port as requested by the USB host. Also when an individually port power controlled hub senses an overcurrent event, only power to the affected downstream port will be switched off. A ganged hub switches on power to all its downstream ports when power must be on for any port. The power to the downstream ports is not switched off unless all ports are in a state that allows power to be removed. Also, when a ganged hub senses an overcurrent event, power to all downstream ports will be switched off.
