Ads
related to: kinds of usb devices and functions
Search results
Results From The WOW.Com Content Network
A composite device may provide several functions, for example, a webcam (video device function) with a built-in microphone (audio device function). An alternative to this is a compound device , in which the host assigns each logical device a distinct address and all logical devices connect to a built-in hub that connects to the physical USB cable.
Such devices can use an external power supply, which is allowed by the standard, or use a dual-input USB cable, one input of which is for power and data transfer, the other solely for power, which makes the device a non-standard USB device. Some USB ports and external hubs can, in practice, supply more power to USB devices than required by the ...
On a USB flash drive, one end of the device is fitted with a single USB plug; some flash drives additionally offer a micro USB plug, facilitating data transfers between different devices. Inside the casing is a small printed circuit board, which has some power circuitry and a small number of surface-mounted integrated circuits (ICs).
This is required as a USB hub functions as a very simple repeater, broadcasting the host message to all connected devices regardless if the packet was for it or not. This means in a mixed speed environment, there is a potential danger that a low speed could misinterpret a high or full speed signal from the host.
Flash memory-based CompactFlash (CF) card (including CFast card) and XQD card (Note: some other types of CF and XQD card are not flash memory-based) Memory Stick (MS) MultiMediaCard (MMC) Secure Digital card (SD, SDHC, SDXC) SmartMedia card (SM) xD-Picture Card (xD) Other: Solid-state drive, SSD, using flash memory (a few SSDs use DRAM or MRAM)
The USB HID class devices and their basic functions are defined in USB-IF documentation without any specific software in mind. Because of these generic descriptions, it is easy for operating system designers to include functioning drivers for devices such as keyboards, mice, and other generic human interface devices.
If you’re looking to connect a bunch of USB devices—and don’t need Ethernet, SD, VGA, or HDMI connections—look for an adapter with USB 3.0 ports (the current standard for USB-A).
An older device can connect to a modern (USB-C) host by using a legacy cable, with a Standard-B, Mini-B, or Micro-B plug on the device end and a USB-C plug on the other. Similarly, a modern device can connect to a legacy host by using a legacy cable with a USB-C plug on the device end and a Standard-A plug on the host end.