1. Charging speed

 

Most users are more concerned about the charging speed of the data cable. At present, the most popular one in the market should be Huawei's 40W 5A super fast charging, which is a super fast charging protocol developed by Huawei itself: SCP protocol. Compared with the old Micro connector data cable, the charging speed of the 5A super fast charge has been doubled many times.

 

The charging speed of the data cable is determined by the charging protocol implanted by each mobile phone manufacturer on the phone, such as Qualcomm's QC protocol, USB-IF PD protocol, Huawei's FCP and SCP protocol, OPPO's flash charging protocol, and Samsung's AFC protocol. Except for PD agreement and QC agreement, other agreements are only for their own mobile phones, not general agreements. And in the future development trend of data lines, major mobile phone manufacturers will implant charging protocols that are only applicable to their own phones according to their own mobile phone charging needs.

 

According to the latest QC protocol QC 5, its maximum charging power can reach 100W+, which requires mobile phones equipped with Snapdragon 865 and 865+ processors to control it. However, there are no detailed parameters for the specific DC voltage and maximum current of the protocol. The charging feature of the QC 5 protocol is a dual charging state. With better thermal management (not exceeding 40°C), the charging speed can reach 100% in 15 minutes. Of course, this is an up-to-date charging protocol that is not widely used in the market. At present, most of the charging protocol based on QC3.0 is used in the market. The DC voltage of this protocol is in the range of 3.6V~20V, and the maximum current can reach 4.6A.

 

The PD protocol is issued by the USB-IF organization, and its full name is USB Power Delivery. The latest version is PD3.0. Starting from PD 2.0, the PD protocol uses the Type-C connector. PD3.0 is compatible with various fast charging protocols, and the latest can support QC4+ fast charging. PD3.0 has 5 power ranges, the maximum power range is 60W~100W, the voltage has four steps of 5V, 9V, 15V, and 20V, and the maximum current reaches 5A.

 

2. Data transmission rate

 

At present, most data cables use USB connectors for data transmission. The data transmission rate of USB is also divided into multiple levels. The specific levels are as follows:

 

The outermost layer of the wire is the sheath, followed by the tinned copper braid, aluminum foil shielding layer, power cord (tinned round copper conductor, red sheath), ground wire (black), and two signal wires (green, white). This is consistent with the internal structure described in YD/T 1591-2009. Among them, the power transmission is the power line and the ground wire, and the signal transmission is the green wire and the white wire. This is what a conventional data line has. Of course, although the cables are basically the same, the production process of each manufacturer is different. Because each product corresponds to a different application occasion, this leads to a different process. Therefore, each manufacturer can formulate relevant technical requirements according to its own product requirements. The YD/T 1591-2009 standard is only used as a reference standard. For actual production, each enterprise has its own standard. However, the structure and size specifications of the connector must be in accordance with the standard, which is related to whether the interfaces match each other, so it must be strictly implemented in accordance with the standard.