The main task of the USB interface on the mobile phone is to charge and connect to the PC to transfer data. Can you think of other functions? Yes, it can also be connected to peripherals such as USB mini fans and small desk lamps. But do you think that all phones have the same experience and effects when implementing these features?
Teenager, you are naive!
Charging speed and interface relationship is not big
The charging of the mobile phone relies on the USB interface, but at this stage, the Android mobile phone USB is nothing more than the Micro USB and Type-C. What is the difference in the charging speed of different brands of mobile phones?
In fact, in general, the relationship between the USB interface of the mobile phone and the charging speed is really small. For example, the popular Qualcomm QC, MediaTek PEP and other fast charging technologies rely on the processor SoC integrated power management chip, which can charge at 5V voltage or fast charge at 9V or 12V. These chips have the final say. Then determine how much current is given by judging the resistance between the two wires.
Of course, there are also unusual situations. For example, OPPO's VOOC flash charging uses a low-voltage and high-current fast charging strategy, while the Micro USB used in OPPO mobile phones cannot naturally carry too much current. Therefore, OPPO has to use the improved Micro USB interface, adding 2 pins to the standard Micro USB to identify and transmit more current.
We all know that the DASH of one plus mobile phone 3 is derived from VOOC, but since the one plus mobile phone 3 uses the USB type-c interface, the type-c can naturally carry more current and voltage, so there is no need to interface. Physical transformation.
In the future of type-c will be unified mobile phone interface, I want to judge the type and speed of fast charging technology through the interface? The answer can only be: no play!
For å•¥type-c did not bring USB3.0
The problem is coming. USB Type-C has been under the banner of “USB3.1†since its inception. For the mobile phone equipped with this interface, the USB transmission speed is still dominated by USB2.0.
Before answering this question, we have to talk briefly about USB Type-C. USB Type-C is just a form of physical interface. Whether it is USB3.0, USB3.1 or Thunderbolt 3, it is an "optional". In the Android mobile phone field, 99% of mobile phones have chosen the default USB2.0, and only a few models use USB3.0.
The reason is very helpless. USB3.0 will interfere with mobile phone signals (including 4G network and Wi-Fi), wireless keyboard and mouse (including 2.4G, 5G, Bluetooth) during data transmission, and this problem has not been effective for many years. s solution. This is evident from Samsung's attitude towards USB 3.0:
GALAXY Note 3 used USB3.0 as the mainstay, but many users have reported that when the computer is connected to transfer files, the 4G signal of the mobile phone will be suddenly interrupted and automatically transferred to 3G/2G mode. Therefore, the problem of USB3.0 interference with the signal has attracted the attention of the industry, and Samsung has given up support for USB3.0 in the subsequent new products.
By the way, the Android phone that supports USB3.0 nowadays is also shielded from this function by default, but data transmission is performed at USB2.0 speed. If you want to switch to USB3.0, a hint will appear that may affect the signal quality. Therefore, for the Android phone to use the Type-C but does not provide the speed of USB3.0, you should not be too entangled.
Why can Type-C be used as a headphone jack?
Today, many Android phones represented by LeTV and MOTO have canceled the 3.5mm headphone jack, and the songs and charging have to rely on the new Type-C. Is this a very high-end technology?
Teenager, don't be surprised! As the ancestor of the USB interface of mobile phones, as early as the era of mini USB interface, it is nothing new to use it to connect headphones. For example, the Motorola L7 and HTC Touch Diamond more than ten years ago used the Mini USB as a representative of the headphone jack.
The reason is very simple, including USB Type-C, Type-A (standard USB interface) and Type-B (Mini USB, Micro USB) type USB interface all support audio signal transmission. Starting with Android 5.0, Google has integrated a standard USB Audio driver library into the system that can transmit audio signals over USB. Therefore, in theory, as long as the system version is above Android 5.0, and the mobile phone equipped with the Type-C interface, the headset of the Type-C interface can be directly used.
Is reverse charging really high?
Nowadays, many mobile phones equipped with large batteries are mainly supporting the function of reverse charging, which means that they can play the role of charging treasure to charge other mobile phones. Is this feature very high?
In fact, the most important feature of all OTG-enabled mobile phones is that they can be charged when they are connected to another mobile phone using the OTG cable. Therefore, this ability to reverse charge is basically supported by all mobile phones. It’s just that many mobile phones don’t have enough batteries, and the role of charging treasures will be a little overwhelming.
So, can you reverse charge your phone that supports OTG?
Bringing up OTG should be a feature of Android phones, which can be used to implement external keyboards, mice, USB flash drives, and peripheral peripherals such as USB fans and USB small desk lamps.
For the OTG function, it is important that the mobile phone USB interface is equipped with a 5V boost module. In the early days, many low-end and mid-range mobile phones cut off this boost module, so it is impossible to implement OTG support physically.
OTG cable with bifurcation head, one side can be connected to the phone, and the other end can be connected to the charger
In addition, some products are equipped with a boost module, but the OTG-related code is removed at the system level, and the software shields the OTG. If your phone is unfortunately of the above type, you can use the OTG line of the DC5V power supply (get extra power while connecting to the phone, simulate the 5V boost module) and modify the system/etc/vold in the root directory of the Android system. The mode curve of the fstab code gets the OTG function.
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