The common MicroUSB 2.0 line has four pins, and each pin is defined as follows, in which Vbus and GND are used for power transmission data. The maximum carrying current for transmitting data. The maximum carrying current of MicroUSB in a safe range is 2AOOPPO VOOC flash current of 4A, so it has a special design for MicroUSB line. Additional contacts are used for greater current to ensure safety.
There are so many Micro USB cables on the market that they are of good or bad quality, and Xiaobian has bought cables that are too slow to connect to a computer on a mobile phone. So, when buying MicroUSB data line, how to choose? Xiaobian has got six microUSB data lines, respectively, from the appearance, charging, data transmission and other aspects of the six data lines for a comparison.
Six data lines from top to bottom, from left to right are OPPO flash line, vivo flash line, Lenovo line, LG line, Meizu line, NTT DoCoMo line. The 6 data lines are all new. The outer skin is made of TPE material. Besides the Meizu MicroUSB line, the other 5 lines are not packed.
First, measure the length of the data line.
The length of the four lines of OPPO, VIVO, Meizu and Lenovo is 1m up and down.
The length of the LG line is the longest, which is 1.8m.
The length of the NTT line is second, 1.3m.
The diameters of the 6 lines are: OPPO 3.79mm, VIVO 3.92mm, Lenovo 3.71mm, LG 3.46mm, Meizu 2.99mm, NTT 3.82mm. According to the diameter of the line, the order from coarse to fine is VIVO, NTT, OPPO, Lenovo, LG and Meizu. (the diameter of the outer skin can not be directly linked to the thickness of the line core, because some brands are thin and some are thin and thin. They are only described as a parameter and are not a direct criterion for judging the quality of the skin.)
USB-A port close-up.
The tongue part: OPPO is a green tongue with black tongue, and the rest is a white tongue.
Metal contact parts: OPPO, VIVO Vbus and GND are flat widening contacts, deep in the middle of a small contact, that is, 5pin, and the other four metal contacts are round, and all are 4Pin.
6 wire MicroUSB plug details, although all MicroUSB plugs can be inserted into standard MicroUSB jack, but it will find different: LG is a 4Pin specification, Meizu, Lenovo, NTT are common standard 5pin specifications, OPPO grooves widen, the metal contact is 7pin, VIVO also widens the groove, the metal contact is 6pin. The extra contacts of OPPO and VIVO are used to identify their own fast charging protocols, and the extra contacts are used as current transmission to reduce contact resistance.
Magnets adsorb the USB-A port, all are adsorbed, all are iron material.
Line resistance is an important parameter for the quality of the charging line. The wire material is poor, the line resistance is large, and the loss in the charging process will be more. We can estimate the resistance of the wire roughly by the pressure drop test. It can also judge the good and bad of the wire, the faster the voltage drop, the greater the line resistance, the worse the electrical conductivity, and should try to avoid in the purchase.
The tools used in the test are: Apple 12W original charger, POWER-Z FL001, EBD-USB electronic load and multi-interface adapter board. The next end of the EBD is connected in sequence, the other end of the computer connects the computer with the computer software step by step current, and the maximum step current is set to 2.4A (the maximum output current of the apple 12W charger). Here's the test results.
The faster the curve falls, the greater the resistance. It is not difficult to see from the diagram that the data line is blocked from small to large.
Association, OPPO, LG, Meizu, VIVO, NTT. In addition, the pressure drop data of the OPPO and VIVO wire above can only show the pressure drop performance of this line in the "conventional 4Pin socket", and the pressure drop will be lower than that in the test chart, if used with the OV cell phone.
How much power will be achieved when you actually charge a mobile phone? We found a mobile phone, a rechargeable battery that supports MicroUSB charging, and recharged the cell phone and rechargeable treasure under the same residual quantity. The results are summarized as follows:
All the six data lines can transmit power normally, and the voltage, current and power have little difference. All the six data lines can be compatible with QC3.0/QC2.0/MTKPE fast charging.
What about the ability to transmit data? As you can see from the previous pin count, all six data lines are USB2.0, then whether there is a data transmission difference or can not transmit data? We use the MicroUSB port of Jinli M6 mobile phone, respectively, using the above 6 MicroUSB data lines to connect the USB3.0 port of the win7 computer, copy 1.96G audio files from the SSD hard disk to the mobile phone, record the time spent on each data line. The statistical results are as follows:
The 6 data lines can transmit data normally, and the difference of speed is small, NTT is 35.84Mb/S, Meizu, LG, association are 35.21Mb/S, VIVO is 34.02Mb/S, OPPO is 33.45Mb/S.
Three. Summary of charging head net
From the test results, the performance of the 6 MicroUSB data lines is good, both of them are capable of normal power transmission and speed transmission. The length of LG data line is the longest and NTT times; the thickness of the line, OPPO and VIVO are the thickest, which is most related to the pin foot and the largest number of wires; in the pressure drop, the association pressure drop is the smallest, OPPO times, the NTT pressure drop is the largest; on the charge compatibility, the 6 data lines are compatible with QC3.0/ QC2.0/MTK PE fast charge; data transmission, NTT In the first place with 35.84Mb/S, OPPO and VIVO are in the end.