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TPS204X Datasheet(PDF) 7 Page - Texas Instruments |
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TPS204X Datasheet(HTML) 7 Page - Texas Instruments |
7 / 19 page Definitions 3 TPS202x/3x and TPS204x/5x USB Power Distribution Definitions Bus-powered hub – Bus-powered hubs (BPH) obtain all power from upstream ports and often contain a nonremovable function. One typical BPH application is a keyboard. The total current drawn by a BPH is the sum of the hub controller current, nonremovable function, and downstream port and is no greater than 500 mA or 5 unit loads. Each port must distribute 1 unit load. Current limit – USB specification requires SPHs to limit current to downstream ports and report over-current conditions to the controller. Downstream port – A port that is electrically further from the host and generates downstream data traffic from the hub. Dynamic attach and detach – To attach or remove devices while host is in operation (hot-plug, unplug event). High-power, bus-powered function – All power to these devices comes from the upstream port. Its current draw can be 1 unit load before configuration and up to 5 unit loads after configuration. Host – The host computer system where the USB host controller is installed. Inrush current – The current surge into uncharged downstream input capacitors. Low-power, bus-powered function – All power to these devices comes from the upstream port. Its current draw is less than 1 unit load. Power Switching – USB specification requires BPHs to power switch downstream ports to limit aggregate current draw of the controller, function, and ports to less than 100 mA before enumeration. Self-powered function – May draw up to 1 unit load from the upstream port. The remainder of power is provided from a local power supply. Self-powered hub – Self-powered hubs (SPH) have a local power supply that power nonremovable functions and the downstream ports. Typical self-powered hubs are PCs, monitors, printers, and stand alone hubs. The SPH is required to have current limit and report overcurrent conditions. The SPH must be able to supply 5 unit loads to all external downstream ports even when the hub is in a suspended state. A battery-powered SPH may configure for 1 unit load or 5 unit loads of output current per port. Unit load – One unit load is 100 mA. Upstream port – The port on a device that is electrically closer to the host and generates upstream data traffic from the hub. USB – Universal Serial Bus Voltage droop – The momentary drop in voltage under transient load conditions. Voltage regulation – The difference in DC voltage levels under continuous load and no-load conditions. |
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