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Based on my processor specification, USB device mode is supported.USB has different kind of connector based on its host/device/ OTG modes. IF USB-OTG mode supported processor used Micro AB usb connector, Then if my processor only support USB device mode, which is the exact connector should i use?

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3 Answers 3

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USB is designed to be a connection between a host (PC) and a client (device). For the host, type A connectors are foreseen, and for clients it's type B.

USB OTG means that a device can also act as host, but it does not specify any connectors. As the device is used as client more often than as host, it should have a type B connector. OTG connections are established via special OTG cables which have type B connectors on both ends. (By the way, a USB OTG device must also be able to deliver power via USB, as most USB devices are USB powered)

About the question what connector to use: The standard type B is common, but a bit bulky. Micro USB is THE standard, as it is used by most mobile phones and power supplies with Micro-B are widely available. This is your best choice if you also plan to power your device by a simple wall wart. If you think Micro-B is a bit too fragile for your use case, have a look at Mini-USB, which is more rigid than the Micro type. However, this connector isn't used that often any more.

Further more, there is UBS 3.0 and Type C as replacement of Micro-B, but as those are not so common yet, I'd avoid them.

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Generally, USB devices use one of the various Type B connectors.

The connector is really specified by whether a device can supply power (Type A), but as the vast majority of devices consume power, they use Type B.

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In USB device mode, your device must use one of the B receptables.

Type B is comparatively large, Mini-B was deprecated, so you should use Micro-B.

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