iPod Pin
Pin Name
USB pin
usb color
1
USB DATA - / Left Channel
2
white
2
USB DATA + / Right Channel
3
green
3
GND
Casing
black
4
VCC
1
red
Remember that this jack is also the headphone jack. The conversion from audio to USB data (+ and -) occurs in the circuit board within the adapter base. Also there is a common diode between the VCC and GND to ensure perfect isolation of VCC.
https://bxt.org/qrupo