3.2.2.1 Input Power Options
The board power source can come through either a USB connector (J10 or J17) connected to a PC or a 5V DC-USB power supply unit. These USB power sources are sufficient to supply the board in most applications.
Important: In case of an external device connected through the USB-B port,
it is recommended to use the 5V DC-USB power
supply unit as the main power source for the entire system rather than a PC or a USB
hub, which are limited to 500 mA typical.
The baseboard embeds a local power management stage comprising two sets of load switches, respectively implemented by MOSFET DMP2160 and DC/DC converter MIC23451.
The following figure is a schematic of the power options.
Note: PC/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.
Jumper J1 is used to perform MAIN_5V current measurements on the baseboard.