The TUSB2036VF hub is a 3.3-V CMOS device that provides up to three downstream ports incompliance with the USB 2.0 specification. Because this device is implemented with a digital statemachine instead of a microcontroller, no firmware programming is required. Fully-compliant USBtransceivers are integrated into the ASIC for all upstream and downstream ports. The downstreamports support both full-speed and low-speed devices by automatically setting the slew rateaccording to the speed of the device attached to the ports. The configuration of theEXTMEM is high, the vendor and product IDs (VID and PID) usedefaults, such that the message displayed during enumeration is General Purpose USB Hub.
The TUSB2036VF supports both bus-powered and self-powered modes. External power-managementdevices, such as the TPS2044, are required to control the 5-V power source switching (on/off) tothe downstream ports and to detect an overcurrent condition from the downstream ports individuallyor ganged.
An individually port power controlled hub switches power on or off to each downstreamport as requested by the USB host. Also when an individually port power controlled hub senses anover-current event, only power to the affected downstream port will be switched off. A ganged hubswitches on power to all its downstream ports when power is required to be on for any port. Thepower to the downstream ports is not switched off unless all ports are in a state that allows powerto be removed. Also when a ganged hub senses an over-current event, power to all downstream portswill be switched off.
The logic level of the MODE pin controls the selection of a crystal input to drive aninternal oscillator or an external clock source.
Feature
- Fully Compliant With the USB Specification as a Full-Speed Hub: TID#30220242
- Integrated USB Transceivers
- 3.3-V Low-Power ASIC Logic
- One Upstream Port and 2 or 3Programmable Downstream Ports
- Total Number of Ports (2 or 3) Selected byInput Pin
- Total Number of Permanently Connected Ports Is Selected by 2 InputPins
- Two Power Source Modes
- Self-Powered Mode
- Bus-Powered Mode
- All Downstream Ports Support Full-Speed and Low-Speed Operations
- Power Switching and Overcurrent Reporting Is Provided Ganged or PerPort
- Supports Suspend and Resume Operations
- Suspend Status Pin Available for External Logic PowerDown
- Supports Custom Vendor ID and Product ID With External SerialEEPROM
- 3-State EEPROM Interface Allows EEPROM Sharing
- Push-Pull Outputs for BUSPWR and Enable Easy Implementation ofOnboard Bus/Self-Power Dynamic Switching Circuitry
- No Special DriverRequirements; Works Seamlessly With Any Operating System With USB Stack Support
- Available in 32-Pin HLQFP Package With a 0.8-mm Pin Pitch (JEDEC ? S-PQFP-G ForLow-Profile Quad Flat Pack)
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