REF: BBONEBLK_SRM
BeagleBone Black System
Reference Manual
Rev A5.2
Page 32 of 108
5.5
PC USB Interface
The board has a miniUSB connector that connects the USB0 port to the processor. This is
the same connector as used on the original BeagleBone.
5.6
Serial Debug Port
Serial debug is provided via UART0 on the processor via a single 1x6 pin header. In
order to use the interface a USB to TTL adapter will be required. The header is
compatible with the one provided by FTDI and can be purchased for about $12 to $20
from various sources. Signals supported are TX and RX. None of the handshake signals
are supported.
5.7
USB1 Host Port
On the board is a single USB Type A female connector with full LS/FS/HS Host support
that connects to USB1 on the processor. The port can provide power on/off control and
up to 500mA of current at 5V. Under USB power, the board will not be able to supply the
full 500mA, but should be sufficient to supply enough current for a lower power USB
device supplying power between 50 to 100mA.
You can use a wireless keyboard/mouse configuration or you can add a HUB for standard
keyboard and mouse interfacing.
5.8
Power Sources
The board can be powered from four different sources:
A USB port on a PC
A 5VDC 1A power supply plugged into the DC connector.
A power supply with a USB connector.
Expansion connectors
The USB cable is shipped with each board. This port is limited to 500mA by the Power
Management IC. It is possible to change the settings in the TPS65217C to increase this
current, but only after the initial boot. And, at that point the PC most likely will complain,
but you can also use a dual connector USB cable to the PC to get to 1A.
The power supply is not provided with the board but can be easily obtained from
numerous sources. A 1A supply is sufficient to power the board, but if there is a cape
plugged into the board or you have a power hungry device or hub plugged into the host
port, then more current may needed from the DC supply.
