USB Hub Controller 64-Pin TQFP

The USB20H04 four-port hub controller is fully compliant with the USB2.0 Specification and does not require firmware development. When connected to a high-speed host, the four downstream facing ports can operate at low-speed (1.5Mb/s), full-speed (12Mb/s), or high-speed (480Mb/s). As required by the USB2.0 Specification, the USB20H04 is fully backward compatible with legacy full-speed hosts. A dedicated Transaction Translator (TT) is available for each downstream facing port. This architecture ensures maximum USB throughput for each connected device when operating with mixed-speed peripherals. The USB20H04 supports both bus-powered and self-powered configurations. For self-powered operation, an external supply is used to power the downstream facing ports. In bus-powered mode, all power is derived from the upstream facing port and no external power supply is required. An external USB power distribution switch device is used to control VBUS switching to downstream ports, and to limit current and sense over-current conditions. A default configuration is available in the USB20H04 following a reset. This configuration may be sufficient for some applications when it is desired to save the expense of an EEPROM. The controller may also be configured from a microcontroller or an external EEPROM. When using the microcontroller interface, the USB20H04 appears as an SMBus slave device. The EEPROM interface supports a 2-wire I2 C device. All required resistors on the USB ports are integrated into the USB20H04. This includes all series termination resistors on D+ and D– pins and all required pull-down and pull-up resistors on D+ and D– pins. The over-current sense inputs for the downstream facing ports have internal pull-up resistors.

• General Features
• Compliant with USB2.0 Specification
• Hub controller IC with four downstream ports
• Four transaction translators ensure maximum USB throughput
• Enables bus-powered Hi-Speed hub design
• Compatible with On-The-Go (OTG) USB devices
• Integrated Session Request Protocol (SRP) operates with dual-role OTG hosts
• Default configuration with pin selectable options
• Serial interface for configuration from EEPROM or microcontroller when default is not used
• Flexible OEM configuration options
• Available in a 64-pin TQFP package
• Hardware Features
• Detects removal of self-power and automatically changes mode to bus-power
• Integrated termination and pull-up/pull-down resistors
• Internal short circuit protection of DP and DM lines
• On-chip oscillator uses low cost 24MHz crystal
• Supports individual or ganged over-current protection and power control
• LED drivers for each downstream port OEM Selectable Features
• Configure as a bus-powered or self-powered
• Hi-Speed USB hub
• Configure port power switching and current sensing on an individual or ganged basis
• Enable LED indicator support
• Enable multiple transaction translators
• Enable compound device support on a port by port basis
• Enable downstream facing ports on a port by port basis Pin Selectable Options for Default Configuration
• Select operation as either a Bus-Powered hub or a Self-Powered hub