preface
On February 22nd, Xiaomi's "People, Cars, and Homes Full Ecology" press conference not only released the image flagship 14 UItra, but also released a number of products including Redmi Book Pro 14/16, of which Redmi Book Pro 16 comes with a new 140W gallium nitride charger set.
This set of chargers not only supports Xiaomi 20V7A 140W private fast charging, but also supports 100W PD fast charging, which makes it also suitable for Apple's MacBook series and many tablets and mobile phones on the market. The maximum carrying current of the supporting data line has also been increased from the classic 6A to 7A, and the performance is more effective. Let's continue to disassemble this data cable and see the workmanship.
The appearance of the Xiaomi 7A fast charging data cable
The Xiaomi Mi 7A fast charging data cable is bundled and organized with a magic cable tie, and the overall color scheme is classic white, and the cable body is flexible and feels good.
The overall design style of the wire is simple, the terminal shell is frosted for easy plugging and unplugging, and the curved surfaces on both sides are rounded.
USB-C male internal non-full PIN design.
The end is equipped with an integrated mesh tail anti-bending protection, and the word 7A is also designed on the mesh tail, indicating that a large current of 7A can be passed.
The length of the cable is about 181cm.
The diameter of the wire body is 3.76mm.
In addition, the weight of the wire is measured to be about 68g.
使用ChargerLAB POWER-Z KM003C测得线缆带有E-Marker芯片，支持20V5A PD快充，还支持小米20V7A私有快充，数据传输能力为USB 2.0。
In terms of pressure drop test, the test data results of 11 gears of the wire rod are shown in the table above.
Drawing a histogram, it can be clearly seen that the gear with the largest voltage drop difference is 0.62V at 20V5A, and the gear with the lowest difference is 0.12V at 5/9/12/20V1A.
Paired with a charger to charge the Apple MacBook Pro, the measured power is 90.32W, and the 100W PD fast charging is successfully enabled.
Xiaomi 7A fast charging data cable disassembled
After reading the appearance and test of the Xiaomi 7A USB-C fast charging data cable, let's disassemble it and take a look at the design and workmanship of the cable.
The USB-C terminal shell is cut open, and the inside is reinforced with a metal shell, and the shell is connected to the USB-C male plug spot welding.
The metal case has the inscription H93CCZ on it.
The end of the metal shell tightens the wire body.
The metal shell is filled with hard sealant to insulate, insulate and reinforce the core.
Remove the hard sealant.
An E-Marker chip is installed on one side of the small plate, which is protected by red glue to strengthen the strength between the male connector and the small plate.
E-Marker芯片特写，丝印3215BA。
The wire core is welded on the other side of the small plate, and the core solder joints are further glued and reinforced.
Clean the glue and solder the core cleanly.
The other end of the terminal shell is cut open, and the inside is also designed for double-layer reinforcement protection of hard sealant and metal shell.
The core solder joints are also further glued and reinforced.
The other side of the board is not soldered with the core and device.
The wire body is cut open, and there are eight cores inside.
The outer sheath of the cable is cut and the inside is wrapped with a spiral shielding net.
Underneath the shield is a layer of shielding aluminum foil.
In addition to the eight cores, there are also multiple tensile wires inside the wire body.
The list of internal cores of the cable is plastic sheath, shielding mesh, shielding aluminum foil, power core, data core, and tensile cable. Let's start with a detailed introduction to the core design inside the cable.
The two red cathode power cores are tinned copper wires, and there are also tensile wires inside the cores.
The two negative power cores are made of transparent sheaths, and the cores are also equipped with tensile wires.
The data cable for USB2.0 data transmission, green is the D+ core, and there is a tensile cable inside.
The data cable for USB 2.0 data transmission has a white D-core and a tensile cable inside.
The yellow CC wire is equipped with a tensile wire inside.
The blue VCONN cable has a tension cable on the inside.
A list of all dismantling and a family photo.
Summary of the dismantling of the charging head network
The charging current of Xiaomi's classic 67W and 120W private fast charging is not less than 6A, and these two fast chargers are the main fast charging of current in the current Mi system, so it is very important for Mi users to have a data cable that can carry more than 6A.
The Xiaomi 7A USB-C fast charging data cable disassembled in this issue is not only increased to 7A in terms of carrying current capacity, but also as a notebook wiring, the length is designed at the 1.8-meter level, whether it is a bedroom, living room, office or library and other scenarios, it can be easily competent, and it is quite worthy of Xiaomi users' collection.
The charging head network learned through dismantling that Xiaomi's data cable USB-C terminal adopts a plastic shell, an internal spot welded metal shell, and is filled with hard rubber to increase strength, and the USB-male connector is also glued to improve the strength and ensure a longer service life. The inside of the cable uses thickened wires, and is equipped with braided shielding mesh and shielding aluminum foil, and fills with tensile wires to increase strength, and the overall workmanship of the product is quite good.