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The difference between the OTG connection line and the common USB connection line
USB data line is our common equipment, OTG connection line as the rapid development of the mobile phone industry in recent years, gradually entered our daily use range. What is the difference between the OTG connection line and the common USB connection line?
The USB data line is used to connect the mobile phone and the computer, and can access the photos and music inside the phone by the computer, and use it as a U disk. The OTG data line does not need PC, and the mobile phone can connect directly to the USB device, such as the U disk, the mouse, the keyboard, and so on through the OTG data line. U disk direct search data, the mouse is convenient to play games, the keyboard can be quickly typed, the camera directly browse pictures, that is, pat. OTG extends the function of the mobile phone.
The difference between OTG and USB connection line connecting line, USB data line connected to the computer, the computer power supply, while the OTG data cable to connect devices such as U disk, mobile phone to U disk and other peripheral equipment power supply, then the mobile phone is how to identify USB data and OTG data line after the dismantling of two lines, will? The 4Pin USB data line is suspended, the 4Pin OTG data line is shorted to ground, mobile phone chip should be judged insert is OTG or USB data cable through the 4Pin, and to decide whether to open the OTG power supply.
The difference in hardware is that one end of the OTG line has a PIN more than a GND, allowing the machine to distinguish who is the host and who is the Device. The single appearance is indistinguishable.
Traditional USB port out of pin has
1. vbus (5v)
OTG connection line only micro interface, total out of 5pin
The USB connection wire is running 4 lines, only in the joint. The mobile phone / flat panel is micro USB, which connects to the common USB connection line, and the ID pin is suspended, so it operates in client/peripheral mode. If you drop ID GND, you will go to host mode.