Datasheet
REF: BBONEGRN_SRM BeagleBone Green
System Reference Manual Rev V1a
21
The majority of capes designed for the original BeagleBone or BeagleBone Black will work
on the BeagleBone Green. The two main expansion headers will be populated on the
board. There are a few exceptions where certain capabilities may not be present or are
limited to the BeagleBone Green. These include:
GPMC bus may NOT be available due to the use of those signals by the eMMC. If the
eMMC is used for booting only and the file system is on the microSD card, then these
signals could be used.
Another option is to use the microSD or serial boot modes and not use the eMMC.
The power expansion header is not on the BeagleBone Green so those functions are
not supported.
5.15 Expansion Board External Power
A cape can have a jack or terminals to bring in whatever voltages may be needed by that
board. Care should be taken not to let this voltage be fed back into any of the expansion
header pins.
It is possible to provide 5V to the main board from an expansion board. By supplying a 5V
signal into the VDD_5V rail, the main board can be supplied. This voltage must not exceed
5V. You should not supply any voltage into any other pin of the expansion connectors.
Based on the board design, this rail is limited to 1A per pin to the BeagleBone Green.
There are several precautions that need to be taken when working with the expansion
headers to prevent damage to the board.
1) Do not apply any voltages to any I/O pins when the board is not powered on.
2) Do not drive any external signals into the I/O pins until after the VDD_3V3B rail is up.
3) Do not apply any voltages that are generated from external sources.
4) If voltages are generated from the VDD_5V signal, those supplies must not become
active until after the VDD_3V3B rail is up.
5) If you are applying signals from other boards into the expansion headers, make sure you
power the board up after you power up the BeagleBone Green or make the connections
after power is applied on both boards.
Powering the processor via its I/O pins can cause damage to the processor.