posted a few days ago about the difference between Micro USB data cable and OTG data cable. A simple summary is in one sentence: the difference between OTG and ordinary data cable is that the fourth pin of Micro USB is grounded. As long as the fourth pin is grounded, USB male and female can be replaced by female. The simple and easy-to-use method has aroused great interest from netizens.
Micro USB-changed OTG data cable
Some netizens left messages hoping to introduce how to modify USB Type-Ch data cable into OTG data cable. To modify, you need to first understand the pin definitions of the data cable and the detailed graphics and text information. First, take a picture to see the pin definition of the USB Type-C data cable.
Through the information pin definition of the USB Type-C data cable above, you can see that A5 and B5 are the two key pins, and the CC pins they belong to have many functions. For example, detecting connections, distinguishing between master and slave modes; configuring Vbus, there are two modes: USB Type-C and USB Power Delivery; configuring Vconn, when there is a chip in the cable, one CC pin transmits signals, and the other CC pin becomes a power supply Vconn, etc.
I checked the random USB Type-C data cables of the two phones and found that the pins were incomplete. Judging from the random USB Type-C data cables of multiple phones at hand, there were only 12 pins, all of which were shrunk. Data transmission can only be in USB 2.0 mode. Although the third-party data cable has a lot more pins, it has reached 16 pins, but it is also in USB 2.0 mode. Take a look at the comparison picture.
Actually, check whether the USB port is shrinking from the other end of the data cable. Let’s talk about how to change the USB Type-C data cable to an OTG data cable. The key foot for transformation is the CC foot. Connect a resistor to the GND pin on the CC pin. After the phone detects this resistor, it will switch to the main mode. The phone will turn on the Vbus power switch and output the power to external device , such as USB disk, keyboard, mouse, etc. The data line at this time becomes an OTG data line.
Since various external devices such as USB disk, mouse, keyboard, etc. are all male USB, the OTG data cable must be female USB. There is a resistor between the CC pin and GND, and the resistance size is not very strict.
If you are interested, you can use the materials at hand to change the USB Type-C data cable that comes with your phone to an OTG data cable, and note that the other end should change the male to a female USB.
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