Lightning is an English word, meaning Chinese is lightning-fast and fast.
Therefore, the Lightning interface, also known as the lightning interface, is the proprietary connector specification made by Apple. It first appeared in the 2012 iPhone 5 conference, starting with the iPhone 5, the new iPhone and iPad are equipped with this Lightning data interface.
The Lightning connector also moves the fixed mechanical snaps used in its previous generation of 30-pin connectors into the base connector, so the joint itself has no moving parts and is compact and not easily damaged.
There are small grooves on the left and right sides of the joint to match the fixing buckles in the interface.
There is also a problem. The metal pins of the Lightning line are exposed outside and there is a certain risk of short circuit. After the actual test by FIX engineers, the Lightning line is under no-load condition (the power supply is not connected to the load) and there is no voltage output.
No voltage or signal is output without load or without detecting accessory devices
Lightning is good, but there is still a USB 3.1 type-c in front of it. Not only can it be inserted and removed, but the function scalability is also much stronger than Lightning.
Helpless, Lightning is Apple's first hand, you have to use his device, then you can only choose to use Lightning.
According to Apple's characteristics, the life cycle of an interface is at least 5-10 years.
In this way, Lightning will continue to serve for several years, but the rapid development of USB 3.1 will definitely make Lightning speed up the update to adapt to a faster era.
Lightning interface functionIn addition to basic charging and data transmission, it also supports digital signal output functions such as video and audio. The Lightning interface used in the current iPhone and iPad series is also only USB 2.0, and the transfer rate is about 25MB-35MB/s.
From the appearance of the lightning male, the positive and negative are the same, 8 feet. But the interface definition of the two sides is different. I divide it into A side and B side here. The specific interface definition is shown in the following figure:
Explain:
1, Sa, Sb is the signal interface, send a signal to the iPhone, telling the iPhone whether it is A or B. In addition, the lightning head has 4 modules. If it is a USB module, Sb also functions as a power supply for peripherals provided by the iPhone.
2. D+ and D- are USB data lines and transmit data.
3, Vusb is the USB power cord, charging the iPhone.
4. NC is the defined foot, which is not used for the time being.
5. GND is the ground wire.
On the other side of the mother seat, there is only one point of contact.
On the female side, the D+, D-, and NC feet switch to the corresponding interface depending on whether the A or B side is inserted.
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