beaglebone-black - Flipbook - Page 73
BeagleBone Black
7.1.2 Connector P9
Table-13 lists the signals on connector P9. Other signals can be connected to this connector based on setting
the pin mux on the processor, but this is the default settings on power up.
There are some signals that have not been listed here. Refer to the processor documentation for more information on these pins and detailed descriptions of all of the pins listed. In some cases there may not be enough
signals to complete a group of signals that may be required to implement a total interface.
The PROC column is the pin number on the processor.
The PIN column is the pin number on the expansion header.
The MODE columns are the mode setting for each pin. Setting each mode to align with the mode column will
give that function on that pin.
NOTES:
In the table are the following notations:
PWR_BUT is a 5V level as pulled up internally by the TPS65217C. It is activated by pulling the signal to GND.
NOTE: DO NOT APPLY VOLTAGE TO ANY I/O PIN WHEN POWER IS NOT SUPPLIED TO THE BOARD. IT WILL DAMAGE
THE PROCESSOR AND VOID THE WARRANTY.
NO PINS ARE TO BE DRIVEN UNTIL AFTER THE SYS_RESET LINE GOES HIGH.
• Both of these signals connect to pin 41 of P11. Resistors are installed that allow for the GPIO3_20 connection to be removed by removing R221. The intent is to allow the SW to use either of these signals,
one or the other, on pin 41. SW should set the unused pin in input mode when using the other pin. This
allowed us to get an extra signal out to the expansion header.
• Both of these signals connect to pin 42 of P11. Resistors are installed that allow for the GPIO3_18 connection to be removed by removing R202. The intent is to allow the SW to use either of these signals,
on pin 42. SW should set the unused pin in input mode when using the other pin. This allowed us to get
an extra signal out to the expansion header.
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Chapter 7. Connectors
