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TPS2070 Datasheet(PDF) 24 Page - Texas Instruments |
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TPS2070 Datasheet(HTML) 24 Page - Texas Instruments |
24 / 29 page ![]() TPS2070, TPS2071 FOUR-PORT USB HUB POWER CONTROLLERS SLVS287A – SEPTEMBER 2000 – REVISED FEBRUARY 2001 24 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION universal serial bus (USB) applications The universal serial bus (USB 1.1) interface is a 12-Mb/s, 1.5-Mb/s, or 480 Mb/s (USB 2.0), multiplexed serial bus designed for low-to-medium bandwidth PC peripherals (e.g., keyboards, printers, scanners, and mice). The four-wire USB interface is conceived for dynamic attach-detach (hot plug-unplug) of peripherals. Two lines are provided for differential data, and two lines are provided for 5-V power distribution. USB data is a 3.3-V-level signal, but power is distributed at 5 V to allow for voltage drops in cases where power is distributed through more than one hub or across long cables. Each function must provide its own regulated 3.3 V from the 5-V input or its own internal power supply. The USB specification defines the following five classes of devices, each differentiated by power-consumption requirements: D Hosts/self-powered hubs (SPH) D Bus-powered hubs (BPH) D Low-power, bus-powered functions D High-power, bus-powered functions D Self-powered functions Self-powered and bus-powered hubs distribute data and power to downstream functions. The TPS2070 and TPS2071 can provide power-distribution solutions for hybrid hubs that need switching between BPH and SPH according to power availability and application requirements. USB power-distribution requirements USB can be implemented in several ways, and, regardless of the type of USB device being developed, several power-distribution features must be implemented. D Hosts/self-powered hubs must: – Current-limit downstream ports – Report overcurrent conditions on USB VBUS – Output 5.25 V to 4.75 at 500 mA D Bus-powered hubs must: – Enable/disable power to downstream ports – Power up at <100 mA – Limit inrush current (<44 Ω and 10 µF) – Output 5.25 V to 4.4 at 100 mA – Not send power back upstream D Functions must: – Limit inrush currents – Power up at <100 mA – Not send power back upstream (SP functions) The feature set of the TPS2070 and TPS2071 allows them to meet each of these requirements. The integrated current-limiting and overcurrent reporting is required by hosts and self-powered hubs. The logic-level enable and controlled rise times meet the needs of both input and output ports on hubs, as well as the input ports for bus-powered functions |
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