Mini USB
　　MiniUSB, also known as the mini-USB, a USB interface standard, USB UniversalSerialBUS is the English abbreviation, Chinese meaning is "Universal Serial Bus," it is for the transmission of data between the PC and digital devices and the development of technology. Standard USB, MiniUSB, MicroUSB become the most common USB interface. Compared with standard USB, MiniUSB smaller for mobile devices and other small electronic devices.
　　1 Introduction
　　Mini USB divided into A, B and AB. MiniB type 5Pin This interface can be said is the most common form of the interface, and this interface is due to the outstanding performance of the anti-error interpolation, the volume is relatively small, so many manufacturers are gaining favor, this interface is now widespread in the card reader , MP3, digital cameras and mobile hard disk.
　　2: Interface Definition
　　Mini USB A, B connectors and contacts (not to scale) Mini USB connector Contact function
　　Where id foot was used in the otg function. Since the mini usb interface so mini-A, B and AB interface. If your system is only used as a slave, then use the B interface, the system controller will determine ID foot level determine what kind of device is plugged, if it is Gaoping, it is the B connector into, then the system will call the shots mode If ID is low, the a interface is inserted, then the system will use the HNP dialogue protocol to decide which to do Master, what do slave OTG is the On-The-Go abbreviation of the OTG technology is to achieve in the absence of Host, the data transmitted from the devices. Mainly used in different devices or coupling between a variety of mobile devices, data exchange. Data can also be on a digital camera, and USB interfaces OTG sent to the mobile hard disk; for example, a digital camera directly to the printer, through OTG technology, connect the two devices see the USB port, you will immediately print out a photo shoot , field operation there is no need to carry expensive memory card, or carry a portable computer.
　　except for the first 4-pin mini USB, the other interface functions are the same as the standard USB. The first 4-pin to become ID, on the mini-A to 5-pin connection, can be left in the mini-B can be connected to pin 5.
　　micro USB
　　Micro USB is a standard USB 2.0 portable version, smaller than the Mini USB interface is currently part of the phone use, Micro-USB is the next generation of Mini-USB specification from the USB American Organization for Standardization USB Implementers Forum (USB-IF) in 2007 on January 4th finalized. Micro-USB support OTG, and Mini-USB, just as the 5pin. Series include the definition of Micro Series Micro-B socket standard equipment used; Micro-AB socket OTG device used; Micro-A and Micro-B plugs, and cable. Unique Micro series is that they contain a stainless steel shell, plug thousand times no problem.
　　1: development history
　　June 2004 including Vodafone, Orange, T-Mobile, O2, Spain's Telefonica, Telecom Italia (TelecomItaliaMobile) and NTT DoCoMo in Japan and other major global mobile network operators, as well as Nokia, Samsung, Motorola, Sony Ericsson and LG and other major mobile phone manufacturers established open mobile terminal platform (OpenMobileTerminalPlatform, OMTP) organization. In September 2007, OMTP announced a unified global phone charger interface standard Micro USB, Micro USB specification supports the new USB technology on mobile devices such as mobile phones, and smaller in the future, more compact portable devices ready . Mobile phone, MP4, digital cameras and other portable devices can be interconnected to communicate without PC via transit. Later that several manufacturers have been committed to the use of mobile phones Micro USB standard, and strive to become the future unified mobile phone charging port, Micro USB interface makes use of an interface to charging, audio and data connections.
　　On the other hand, in fact, to achieve this agreement is the result of the European Union also advocated. EU WEEE department for handset manufacturers because of the differences caused by the interface is responsible for waste and pollution, and want a unified interface protocol can reduce waste in this area. The EU also suggested a new phone when you pack because it has relations Micro USB charger, the charger can be omitted. As a result, not only can reduce waste, packaging and transportation costs can also be reduced. Furthermore, an interface can be charged and data transmission, you can simplify the operation, the user is also a good thing.
　　2: Features and Advantages
　　Micro-USB connector is smaller than the standard USB and Mini-USB connector, saving space, with up to 10,000 times plug life and strength, blind mating design. Micro-USB standard supports the current USB-OTG function, that in the absence of a host (such as a personal computer), it can directly implement data transmission between a portable device, compatible USB1.1 (low speed: 1.5Mb / s, full speed: 12Mb / s) and USB 2.0 (high speed: 480Mb / s), while providing data transfer and charging, especially for high-speed (HS) or higher rate of data transmission, connecting small devices (such as mobile phones, PDA, digital cameras, digital cameras and portable digital players, etc.) is the best choice. While also providing convenience for the car, just USB car charger, plus MICRO USB data cable for mobile phone emergency charging. And directly above the luxury car has a 5V output interface connected to the MICRO USB cable to charge the phone. MICRO USB wide versatility for convenience.
　　3: Mobile Interface
　　Held in Geneva, Switzerland, October 26, 2009 ITU ITU-T Study Group V (SG5) plenary session completed the "Universal power adapter and charger solutions mobile terminals and other ICT devices" standard framework discussed and adopted, and apply for entry into the approval process. This actually means that the world is unified standard mobile phone charger. It is estimated that the new standard charger can reduce energy consumption by half, and the charger will reduce 51,000 tons of waste generated waste and 13.6 million tons of greenhouse gas emissions per year. The main thing is that we can do at home and in the office equipment 2 charger.
　　Our universal charger interface standard in the June 14, 2007 the formal implementation of the overall structure of the charger and the charger side interfaces are clearly defined, the most widely used generic USB A connector, can solve common charger, they can the phone can be easily connected to the computer to achieve charging or transferring data. The essence of this standard is to "Transformer installation of a USB interface", consists of a mobile phone charger to charger MicroUSB data cable and a USB with a female. Chargers female can not become the standard configuration of the phone, just a USB cable can also be charged directly from a PC interface. For the interface side of the phone there is no relevant standards.
　　Experts said that as the Micro-USB Mini-USB equivalent in terms of both volume and the number of plug or electrical characteristics and have an advantage, therefore, Micro-USB interfaces will become mainstream. We 'Telecommunication Terminal Testing Technology Association "(TAF) has carried out studies on the selectivity of the interface side of the phone in September 2007, while the Micro-USB interface is listed in the relevant pre-program.
　　Increasingly concerned about environmental protection in the global period in the near future, manufacturers in the sales of mobile phones will likely no longer be supplied charger, in order to reduce pollution and waste caused by the extra charger; consumers do not have to replace the phone after frequent replacement chargers, and may require the user to purchase.