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The first function of a USB peripheral is to transfer data to and from the USB host. The peripheral must also manage the power, while the supply current that can be drawn from the bus depends on the state of the bus. A bus-powered device in normal mode may draw up to 500 mA, but when a bus is suspended, the device must draw less than 500 µA. If the device supports remote wakeup, it may draw up to 2.5 mA when in suspend mode. Finally, a USB peripheral has to make sure to respond to all status and setup messages from the host. If the USB peripheral does not properly respond to the requests, the USB host will consider the USB peripheral a non-compliant device and cut it off from the network.
PTM Published on: 2011-12-09
United Kingdom