Saying that the current era of May 2017, the mainstream mobile phone connector has three kinds, from top to bottom is Apple's lightning connector, Android phone's Micro-USB connector, and the blazing TYPE-C connector.
Then for these three connectors, there are naturally three data lines for the connector. On the Internet, we may come across many and many pseudo-popular texts. One of the characteristics of this article is to answer questions in a one-size-fits-all manner. For example, is the original charger better than the assembled one? Is the original data line better than the third-party data line? You still don't know it, eat lemon, eat shrimp, you will poison and die! This type of article is a pseudo pseudo popular science, because he put aside the actual, put aside the data, put aside specific issues, directly give you a baffling answer, such articles will get many clicks and forwards, but that Not the truth.
At present, the data line / Usb Cable design field is divided into two extremes. One is adding silver to the middle of the line and adding copper alloys, which greatly reduces the current loss and enhances the ability of the line to transmit data and power. The other is to do some design on the surface of the circuit such as camouflage texture, denim texture, magnetic design, with a luminous design, and so on. The result of these two designs is that the appearance of the data line can be intuitively improved, and many friends who do not look for performance only look at the appearance will like this type of low-cost line. For a small number of pure technology enthusiasts who only pursue performance without looking at the appearance, they would like to pursue a T-force line with a resistance close to zero.
The choice of circuit appearance also includes another kind of publicity. One is the pure copper socket. The circuit maker will promote this design. The other type of socket is the ordinary ferroalloy socket.
Apple Line is a kind of lightning data line. It is a kind of positive and negative pluggable data line design, which is mainly used for Apple devices. Apple's product charging agreement is Apple's laptop adopts PD protocol, Apple's tablet adopts 5V 2.4A protocol, Apple's 6th mobile phone adopts 5V 2.1A protocol, and Apple's early devices use 5V 1.0A protocol. Apple's data line has built-in chips to adapt to these protocols.
The core of Apple's data line selection is the built-in chip. The theoretical price of this chip is actually very low. Apple's original data line is relatively expensive and more expensive is the brand added value. For a third-party data line, a line with a chip may cost as little as 39 yuan, and a line without a chip may be about 9.9 bags.
The chip is the core part of Apple's charging line. This chip is designed to allow this line to recognize the charging protocol, as well as prevent over-voltage cut-off, and under-voltage protection. The following is a circuit with a chip, intentionally loading a voltage higher than 6V that is not suitable for an iPhone in the starting position. Then the terminal is at the end of the line and the instrument is off, indicating that no current output reaches the end point. The presence of the chip prevents unsafe current output from reaching the phone. The use of a circuit with a chip is a design for ensuring that there is no electrocution during charging.
Using low-cost products without Apple chips to do the same starting voltage higher than 6V test, we can see that the starting point is the main 9.25V green meter, and the red meter at the end position still has voltage. The line does not block unsafe voltages and currents from reaching the iPhone. If the front-end charger breaks down, 220V may reach the phone along the line.
Relatively speaking, the M-USB data cable is currently outdated. This is a product that belongs to the era of USB2.0. However, there are still many mobile phones using this type of design.
For the selection of M-USB lines, the technical content is that only the products with lower line loss are selected.
The test can be found that the mode of charging using the M-USB socket is roughly a USB 2.0 charging protocol (5V 1A) charging, and DCP 5V 1.5A mode, or a small number of mobile phones use the QC fast charging mode for charging.
For example, this data line, the length of 1 meter, in the transmission of 5V 1A power under the premise of the circuit itself is about 0.29V voltage loss. The lost electrical energy is actually turned into heat. It is transferred to the charger while the other side is transferred to the mobile phone. The higher the line loss is, the higher the product description is, and the more gradual the heat is. With long-term use, the metal inside the circuit itself accumulates wrinkles, fatigue accumulates, and the resistance gradually increases. For non-small whites, under the premise of similar prices, the line with the lowest line loss is preferred.
At present, the TYPE C line should belong to the current mainstream line.
In the simplest category, this line already has USB2.0, USB3.0, USB3.1 three design, because there is already a TYPE-C jack phone, U disk, hard disk, peripherals and other data needs Transmission design. Therefore, it is necessary to preferentially select a higher-speed data transmission line because the preceding LIGHTNING line and M-USB line are based on the USB 2.0 interface design, and there is no data transmission gap.
TYPE C design, the common fast charge mode is PD fast charge protocol QC fast charge protocol, etc. It seems that the classification of TYPE C circuit design is rather confused, the notebook accessories for Apple's TYPE C line and TYPE for Android phones. The appearance of the C fitting looks like a socket, but the standard inside is not the same. There may be situations where it is plugged in and does not work. So buy accessories to distinguish TYPE C mode.