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USB connector types multiplied as the specification progressed. The connectors were different so that users could not connect one computer receptacle to another.

Mini USB to Micro USB

The data pins in the standard plugs are recessed compared to the power pins,so that the device can power up before establishing a data connection. Some devices operate in different modes depending on whether the data connection is made. Charging docks supply power and do not include a host device or data pins, allowing any capable USB device to charge or operate from a standard USB cable. Charging cables provide power connections, but not data.

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In a charge-only cable, the data wires are shorted at the device end, otherwise the device may reject the charger as unsuitable. Standard connectors[ edit ] Pin configuration of type-A and type-B plugs, viewed end-on The type-A plug has an elongated rectangular cross-section, inserts into a type-A receptacle on a downstream port on a USB host or hub, and carries both power and data.

Captive cables on USB devices, such as keyboards or mice, terminate with a type-A plug.

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The type-B plug has a near square cross-section with the top exterior corners beveled. As part of a removable cable, it inserts into an upstream port on a device, such as a printer. On some devices, the type-B receptacle has no data connections, being used solely for accepting power from the upstream device. The Micro-A connector is 6.

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In this way, cables with smaller 5 pin USB 2. USB cables exist with various combinations of plugs on each end of the cable, as displayed below in the USB cables matrix. The Micro-AB receptacle is capable of accepting both Micro-A and Micro-B plugs, attached to any of the legal cables and adapters as defined in revision 1.

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To enable Type-AB receptacles to distinguish which end of a cable is plugged in, plugs have an "ID" pin in addition to the four contacts in standard-size USB connectors. Typically, a pull-up resistor in the device is used to detect the presence or absence of an ID connection.

The OTG device with the A-plug inserted is called the A-device and is responsible for powering the USB interface when required, and by default assumes the role of host. The OTG device with the B-plug inserted is called the B-device and by default assumes the role of peripheral. An OTG device with no plug inserted defaults to acting as a B-device.

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If an application on the B-device requires the role of host, then the Host Negotiation Protocol HNP is used to temporarily transfer the host role to the B-device.

Блок комментариев

Блог в ридер однозначно
27.08.2018 16:33
Полностью разделяю Ваше мнение. Это отличная идея. Готов Вас поддержать.
31.08.2018 07:30
Короче, дело к ночи. После поста разморило… Пошел спать.
09.09.2018 14:27

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