3.1.1.2 USB Supply Input

The USB-powered operation comes from the USB device port connected to a PC or a 5 VDC supply through a USB type-A to type-C cable. The USB supply is enough to power the board in most applications. It is important to note that when the USB supply is used, the USB port has limited power. If a USB host port is required for the application, it is recommended to use the external DC supply or a more capable USB external power supply. The following figure shows the USB input power supply topology.

Figure 3-3. USB Input Power Schematic

Note: USB-powered operation eliminates additional wires and batteries. It is the preferred mode of operation for any project that requires only a 5V source at up to 500 mA.

Warning: Note that a symmetric type-C to type-C USB cable cannot be used to power the board.