User Manual

element14 is a trademark of Premier Farnell plc 107

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

element14 BeagleBone Black.

There are several precautions that need to me 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 element14 BeagleBone Black 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.

8.7 Mechanical

This section provides the guidelines for the creation of expansion boards from a

mechanical standpoint. Defined is a standard board size that is the same profile as the

element14 BeagleBone Black. It is expected that the majority of expansion boards created

will be of standard size. It is possible to create boards of other sizes and in some cases

this is required, as in the case of an LCD larger than the element14 BeagleBone Black

board.

8.7.1 Standard Cape Size

Figure 70

is the outline of the standard cape. The dimensions are in inches.