Although the micro USB connector is much thinner than its mini USB brother, it has been especially designed for rough use and the connector is specified for at least 10000 connect/disconnect cycles. Therefore in January 2007 the micro USB connector was announced which could be easier integrated in thin devices than the mini USB version. In the modern world small is never small enough and the mini USB B connector soon was too large for new equipment like cell phones. Mini USB A and B connector pin names Micro USB AB and B connectors It has been added for future enhancements of the USB standard.
#USB CONNECTOR SERIES#
In the mini connector series this pin is normally not connected. In practice you won’t find the mini USB A connector any more.īesides the size, the main difference between the standard USB A and B connectors and the mini USB A and B versions is the extra pin which is called ID. There has also existed a mini USB A connector for some time, but as the USB A connector is used on the power sourcing side-mostly a larger piece of equipment like a computer-that connector was withdrawn from the standard and no new devices will receive certification any more if they contain such a connector.
#USB CONNECTOR UPDATE#
An update to the USB 2.0 specification was posted with the name Mini-B connector engineering change notice which defined a smaller version of the B connector. The USB A and B connectors proofed their usability with devices like printers, modems and scanners, but when the faster USB 2.0 was released and USB became not only a way to connect slow and bulky equipment but also faster and smaller devices like photo camera’s and mobile telephones, especially the standard USB B connector was just too big to fit nicely on these smaller equipment. The good thing of a USB connector standard is that it is possible to design devices without need to think how that device should be connected to other devices. Standard USB A and B connector pin names Mini USB A and B connectors
#USB CONNECTOR DRIVER#
With this sequence the chance that the driver or receiver ports of the data connection receive awkward and possible dangerous voltages is lowered substantially. This is done on purpose to first connect the power supply when connecting a USB device, and only afterwards establish the data connection. If you look carefully at the connector you will see that the pins for the power connection (pin 1 and 4) are slightly longer.
Two pins are used for power and two pins are used for differential data transmission. In the standard USB A and B connectors specified in the USB 1.1 and USB 2.0 specification, four pins are defined. Standard A and B USB connectorsīecause of all these reasons, two USB connectors have been defined for basic use, the USB A connector which must be used on devices which provide power (mostly computers), and the USB B connector used on devices which receive power like most peripheral devices.
As USB can power devices over the cable it is not only necessary that an USB connector can not be connected in the wrong orientation, but the design must also not allow that two power providing USB devices are connected with each other as this may cause one or both power supplies to be damaged. This is something which can happen for example with flat cable connectors and power connectors inside computers. People who have often disconnected and reconnected their VGA cable might have experienced that these densely populated connectors have very thin pins which bend easily.Īnother problem with bad connector design is that you may accidentally connect them wrong. The DB9 and DB25 connectors which are used for RS232 ports and parallel ports on computers often have problems with connection bolts falling out of the computer case if someone has accidentally tightened the screws of the connector to far. The old Centronics connectors for parallel printers were bulky and needed clips to connect them securely to the devices. Much effort has been put in the design of the several USB connectors to make them useful for their purpose. This document contains information about all known USB connector types and will help you to find the right cable to connect equipment to your computer. This is because especially for smaller equipment like cameras different models of USB connectors have been defined. Although the USB interface itself is standard, and you should be able to connect every device to a USB enabled computer if the appropriate driver exists, problems may arise to find the right cable. The USB interface is one of the most used interfaces at this moment to connect peripheral equipment to computers.
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