Datasheet
REF: BBONEGRN_SRM BeagleBone Green
System Reference Manual Rev V1a
18
DDR3L requires 1.5V instead of 1.8V on the DDR2 as is the case on the original BeagleBone.
The 1.8V regulator setting has been changed to 1.5V for the DDR3L. The LDO3 3.3V rail
has been changed to 1.8V to support those rails on the processor. LDO4 is still 3.3V for the
3.3V rails on the processor. An external LDOTLV70233 provides the 3.3V rail for the rest of
the board.
5.5 PC USB Interface
The board has a Micro USB connector that connects the USB0 port to the processor. This
is the most commonly used connector.
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 three different sources:
USB port on a PC
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