1, USB-datakabel bruges til at forbinde telefonen og computeren, it can access the phone through the computer photos, music and other data. At the same time, because the mobile phone has its own memory or expansion card, so in a sense, the mobile phone is another kind of U disk. Of course, it is also an essential connection bridge for charging mobile phones, tablets, MP4 and other digital devices.
2, OTG data cable, your mobile phone does not need to go through the PC or notebook, du kan direkte gennem OTG-datakablet og USB USB-enheder såsom USB-disk, mus, tastaturforbindelse, det vil sige, mobiltelefonen kan tilsluttes direkte til USB-disken for at finde information, opret forbindelse til musen for at spille spil, opret forbindelse til tastaturet hurtig indtastning, tilslut til kameraet for at gennemse billeder, det er, skyde og aflevere. Med andre ord, OTG-linjen gemmer det trin, at hver enhed skal gå gennem computeren for at kommunikere information, hvilket ikke kun udvider mobiltelefonens funktion, but also makes us more convenient to connect with the Internet, and is more suitable for the development of this mobile Internet era. Tablets and other OTG-enabled digital devices are also available.
3, the difference between OTG cable and ordinary USB cable is also that: when the USB data cable is connected to the computer, the external device is powered by the computer, and when the OTG data cable is connected to the device such as the U disk, the main object such as the mobile phone must supply power to the peripheral devices such as the U disk.
4, so how does the mobile phone identify the USB data cable and OTG data cable? After disassembling the two wires, you will find that the 4pin of the USB data cable is suspended, the 4pin of the OTG data cable is short connected to the ground, and the mobile phone chip should determine whether the OTG data cable or USB data cable is inserted through the 4pin, and decide whether to turn on the OTG power supply function.
5, the difference in hardware is that there is a PIN at one end of the OTG line connected with a GND ground line, so that the machine can distinguish who is the host and who is the Device peripheral, and it is impossible to distinguish the OTG line and the ordinary USB line with the appearance alone.
6, the traditional usb interface pin is: 1.vbus (5v) 2.GND3.D + 4.D –
7, OTG cable only Micro interface, a total of 5pin1.vbus2.GND3.D + 4.D-5.ID
8, USB cable running inside are 4 lines, the difference is the connector. Mobiltelefonen eller tabletten bruger et Micro USB-stik, tilsluttes til et almindeligt USB-kabel, og ID-nålen er suspenderet, så det fungerer i klient/periferi tilstand. Hvis ID GND er jordet, den går i værtstilstand.
