Micro-USB Interface Introduction

Wed Sep 06 19:58:41 CST 2023

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Micro-USB Interface Introduction

Micro-USB is a portable version of the USB 2.0 standard, smaller than the Mini USB ports used in some mobile phones. Micro-USB is the next-generation specification of Mini-USB, and was developed by the USB standardisation organisation, the USB Implementers Forum (USB-IF) in the USA, on January 4, 2007.Micro-USB supports OTG, and is also 5-pin. USB supports OTG, and like Mini-USB, it is also 5-pin. the Micro series is defined by the Micro-B series of slots used for standard devices; the Micro-AB slots used for OTG devices; the Micro-A and Micro-B plugs, and the cables. what makes the Micro series unique is that they include stainless steel housings where 10,000 times of plugging and unplugging is no problem. plugging and unplugging is not a problem. From 2017 the EU will fully harmonise the use of MicroUSB port chargers.

Micro-USB connectors are smaller than standard USB and Mini-USB connectors, saving space, with up to 10K times of insertion and removal life and strength, asymmetric design so it is not easy to insert the reverse.Micro-USB standard supports the current USB OTG function, that is, in the absence of a host computer (such as a personal computer), portable devices can be directly between the realization of data transfer, compatible with It is compatible with USB 1.1 (low speed: 1.5Mb/s, full speed: 12Mb/s) and USB 2.0 (high speed: 480Mb/s), and provides data transfer and charging at the same time, which is especially suitable for high speed (HS) or higher rate data transfer, and is the best choice for connecting small devices (such as mobile phones, PDAs, digital cameras, digital camcorders, and portable digital players, etc.). It can also provide convenience for car, only need USB car charger, plus MICRO-USB data cable for mobile phone emergency charging. In addition, there is a 5V output port directly connected to the MICRO-USB cable for mobile phone charging in high-grade cars.

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The normal MicroUSB 2.0 cable is 4 Pins, each pin is defined as follows:

Among them, Vbus and GND are used for power transmission, Data+ and Data- are used for data transmission.Micro-USB carries a maximum current of 2A within the safety range, and the current of OPPO VOOC flash charging is 4A, so its Micro-USB cable has a special design, and extra contacts are used to pass a higher current to ensure safety.

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S+ / S- : Power cord positive / negative

D+ / D-: Data cable positive / negative

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USB Type-A interface Wiring Diagram 

Type-A, the most commonly used interface, is also commonly referred to as the USB port.

If the tongue inside the USB is not blue, it is the USB 2.0 version, which has a low transfer rate, high compatibility, and can be connected without a driver. The theoretical transfer rate is 480 Mbps, i.e. 60 MB/s, but the actual transfer rate is generally no more than 30 MB/s, and there are more USB devices using this standard.

If the internal tongue is blue, it is the USB 3.0 or higher version, high transfer rate, need driver, but at present the mainstream devices have basically supported USB 3.0 or higher devices.USB 3.0 theoretical transfer speed of 5 Gbps, but due to the use of the same 10 Bit transmission mode with SATA (in the basis of the USB 2.0 added a pair of error-correcting code) so the The theoretical transfer speed is 500MB/s.

USB 3.1 doubles the theoretical speed of 3.0 to 10 Gbps. 

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Micro-USB Interface Detail 

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Micro-USB Pins definition

Hornmic is committed to providing you with high quality USB cables, including Micro-USB cables, in large quantities.

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By HornmicLink_Bob Kuo @230906 20:02