USB pinout, wiring and how it works! USB A, B 2.0 and 3.0 Cable Pinout. The USB cable provides four pathways- two power conductors and two twisted signal conductors. The USB device that uses full speed bandwidth devices must have a twisted pair D+ and D- conductors. The data is transferred through the D+ and D- connectors while Vbus and Gnd connectors provide power to the USB device. USB wiring diagram- Micro USB pinout, 7+ Images | SM Tech Below is the figure showing the pinout diagram of the USB micro-B and USB-A wiring diagram. Type-A USB pinout diagram, micro USB pinout diagram along with USB wiring diagram: This cable is most commonly used in mobile charger for charging mobile phones and as a USB data cable to connect mobile devices to tranfer files and images between personal computers and phones. Micro-USB charger cable pinout diagram @ pinoutguide USB Pin Number Description Micro-USB Pin Number; 1: VCC +5V, up to 500 mA by USB 2.0 standard: 1: 2: tied together or connected via resistor. In order to device may recognize charger this lines should be tied together via resistor 0-200 Ohm: 2: 3: 3: 4: GND: 5 How to Make a USB No-data Charger Cable : 6 Steps (with According to the Wikpedia article on USB a charger cable (i.e. no data) should have Data+ and Data- connected by no more than 200 ohms as seen by the device being charged. If you just cut the data cables, as suggested, some Garmin sat navs will reboot when you plug the cable in. Connecting 50 ohms between the data wires stopped this happening the sat nav just registered it was being charged.