Analysis of Lightning connector that can be used on both sides.Elastic electrode price

　　Peter Bradstock from Double Helix Cables said last week that he found a verification chip hidden in the Lightning cable. Following his in-depth analysis of the Lightning connector and exploring its working principle, this week he has a new discovery-the arrangement of pins on the interface is dynamically allocated according to the way the cable is inserted into the device (such as iPhone 12).

　　At this month's press conference, Apple also introduced the Lightning connector. This new all-digital connector has an "automatic adapter interface that only uses the signals required by each accessory." But Bradstock's test shows that Apple's cable even allows users to use it on both sides.

　　The USB power connection of the Lightning cable is symmetrical on both sides of the interface. If we arrange the pins 1-8 on the interface, then the pin 1 of the upper row will be connected to the pin 8 of the lower row. In this way, users can connect the Lightning cable to the iPhone 5 at will, regardless of the direction. This design makes the pin at the bottom right connect to the same point on the iPhone's corresponding Lightning interface.

　　However, Bradstock's test also found that although the USB power connection is symmetrical, the data connection in Lightning is asymmetrical. He believes that the dynamic allocation of pins in the interface is done by the chip in the iPhone 5. The Lightning interface of iPhone 5 may read the data from the pin, and then dynamically adjust it according to the way the cable is inserted.

　　The dynamic chip allocation completed by the iPhone 5 also explains why the verification chip is hidden in the Lightning cable. The location of the chip is between the USB V+ contacts and the Lightning power supply contacts.

　　The new Lightning connector has a complex structure, which is 80% smaller than the previous connector. At the same time, it adopts a brand-new production process, which greatly reduces the yield of the product. This is why the iPhone 5 will have a tight supply due to the limitation of the Lightning connector.

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