The OTG cable grounds the ID pin unlike a regular USB cable so your tablet knows to expect that USB stick on the other end of the cable which requires power etc.īasically if the ID signal going to processor signal is grounded, that device wants to supply power to the USB and initially behaves as the host. In that case connect it to the ID pin on the Micro-B (*) connector. So you should NOT leave the ID-pin floating if you've got OTG functionality in mind for your tablet or whatever. USBID pin (microcontroller): unconnected and ID pin (USB connector): unconnected USBID pin (microcontroller): connected to ID pin (USB connector) The USBID pin from microcontroller: connected to ID pin (USB connector) ID pin (USB connector): connected to ground The USBID pin (microcontroller): unconnected None of the answers are quite correct/complete.īelow is a general guide for connecting the USBID pin from a
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