What is micro USB?

Micro USB

Micro USB is a portable version of the USB 2.0 standard, which is smaller than the Mini USB interface used by some mobile phones. Micro-USB is the next-generation specification of Mini-USB, which was developed by USB Standardization Forum (USB-IF) in 2007. Completed on January 4th. Micro-USB supports OTG, and like Mini-USB, it is also 5pin. The definition of the Micro series includes Micro-B series slots for standard equipment; Micro-AB slots for OTG equipment; Micro-A and Micro-B plugs, and cables. What makes the Micro series unique is that they contain a stainless steel housing that is not a problem for thousands of insertions.
From 2017, the EU will fully use the MicroUSB port charger.

Development History
June 2004 includes Vodafone, Orange, T-Mobile, O2, Spain's Telefonica, Telecom Italia (TelecomItaliaMobile)
Open mobile terminal platforms (Open Mobile Terminal Platform, OMTP) have been established with major mobile network operators such as NTT DoCoMo and NOIN in Japan, as well as major mobile phone manufacturers such as Nokia, Samsung, Motorola, Sony Ericsson and LG. In September 2007, OMTP announced that the global unified mobile phone charger interface standard is Micro USB. The new Micro USB specification supports USB technology on mobile devices such as mobile phones, and is ready for smaller and more compact portable devices in the future. . Various portable devices such as mobile phones, MP4s, and digital cameras can be interconnected and communicated without going through a PC. In the future, the mobile phones produced by these manufacturers will focus on adopting the Micro USB standard, and strive to make it a unified charging interface for future mobile phones. The use of the Micro USB interface enables one interface to perform charging, audio and data connections.
On the other hand, the conclusion of this agreement is also the result of the active promotion of the EU. The EU WEEE department requires handheld device manufacturers to be responsible for the waste and pollution caused by the interface differences, and hopes that the unified interface protocol can reduce this waste. The EU also suggested that the new phone can be saved when it is packaged because people have a Micro USB charger. This will not only reduce waste, but also reduce packaging and shipping costs. In addition, an interface can be used for charging and data transmission, which can simplify various operations and is also a good thing for the user.

Feature advantage

Micro-USB connector is smaller than standard USB and Mini-USB connectors, saves space, has up to 10,000 insertion and removal life and strength, blind
Insert structure design. The Micro-USB standard supports the current USB OTG function, that is, in the absence of a host (such as a personal computer), the portable device can directly realize data transmission, compatible with USB1.1 (low speed: 1.5Mb/s, full speed: 12Mb/ s) and USB 2.0 (high speed: 480Mb/s), providing data transmission and charging, especially suitable for high speed (HS) or higher data transmission, connecting small devices (such as mobile phones, PDAs, digital cameras, digital video cameras) And the best choice for portable digital players, etc.). At the same time, it can also provide convenience for the car, only need USB car charger, plus the MICRO USB data cable for mobile phone emergency charging. And on the high-end car directly on the 5V output interface connected to the MICRO USB cable to charge the phone. MICRO USB is versatile and easy to use.

Interface definition

Mobile phone interface

The framework standard for "Power Adapters and Charger Solutions for Universal Mobile Terminals and Other ICT Devices" was discussed and approved at the ITU-T Study Group 5 (SG5) plenary meeting in Geneva, Switzerland, on October 26, 2009. And apply to enter the approval process. This actually means that the mobile phone charger standard will be unified worldwide. It is estimated that the new standard charger can reduce energy consumption by half, and will reduce the waste generated by 51,000 tons of waste chargers and 13.6 million tons of greenhouse gas emissions each year. The main thing is that we don't have to have 2 chargers at home and in the office.
The universal charger interface standard officially implemented on June 14, 2007 in China has clearly defined the overall structure of the charger and the interface on the charger side. The most widely used USB A interface can solve the general purpose of the charger. Enables the phone to be easily connected to a computer for charging or transferring data. The essence of this standard requirement is "the USB interface is installed in the transformer", and the mobile phone charger is replaced by a MicroUSB data cable and a charger with a USB socket. The charger base can no longer be the standard configuration of the mobile phone, only the USB data cable can be used, or it can be directly charged from the PC interface. There are no relevant standard requirements for the interface on the mobile phone side.
Experts say that since the Micro-USB is equivalent to the Mini-USB, both the volume and the electrical characteristics and the number of insertions and removals have advantages, so the Micro-USB interface will become the mainstream. Our "Telecom Terminal Testing Technology Association" (TAF) launched a selective study on the mobile phone side interface in September 2007, and the Micro-USB interface has been included in the relevant pre-selection scheme.
In the global era of environmental protection, in the near future, manufacturers will no longer be equipped with chargers when selling mobile phones to reduce the pollution and waste caused by excess chargers; consumers will not have to change them frequently after replacing them in the future. Charger and may need to be purchased by the user.

how to choose mirco usb cable?

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