Expansion
Expansion Connectors
The expansion interface on the board is comprised of two 46 pin connectors, the P8 and P9 Headers. All signals on the expansion headers are 3.3V unless otherwise indicated.
Note
Do not connect 5V logic level signals to these pins or the board will be damaged.
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.
Figure ? shows the location of the expansion connectors.

The location and spacing of the expansion headers are the same as on BeagleBone Black.
Connector P8
The following tables show the pinout of the P8 expansion header. The SW is responsible for setting the default function of each pin. 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 column heading is the pin number on the expansion header.
The GPIO row is the expected gpio identifier number in the Linux kernel.
The BALL row is the pin number on the processor.
The REG row is the offset of the control register for the processor pin.
The MODE # rows are the mode setting for each pin. Setting each mode to align with the mode column will give that function on that pin.
If included, the 2nd BALL row is the pin number on the processor for a second processor pin connected to the same pin on the expansion header. Similarly, all row headings starting with 2nd refer to data for this second processor pin.
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.
Todo
Notes regarding the resistors on muxed pins.
Connector P9
The following tables show the pinout of the P9 expansion header. The SW is responsible for setting the default function of each pin. 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 column heading is the pin number on the expansion header.
The GPIO row is the expected gpio identifier number in the Linux kernel.
The BALL row is the pin number on the processor.
The REG row is the offset of the control register for the processor pin.
The MODE # rows are the mode setting for each pin. Setting each mode to align with the mode column will give that function on that pin.
If included, the 2nd BALL row is the pin number on the processor for a second processor pin connected to the same pin on the expansion header. Similarly, all row headings starting with 2nd refer to data for this second processor pin.
NOTES:
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.
In the table are the following notations:
PWR_BUT is a 5V level as pulled up internally by the TPS6590379. It is activated by pulling the signal to GND.
Todo
(Actually, on BeagleBone AI, I believe PWR_BUT is pulled to 3.3V, but activation is still done by pulling the signal to GND. Also, a quick grounding of PWR_BUT will trigger a system event where shutdown can occur, but there is no hardware power-off function like on BeagleBone Black via this signal. It does, however, act as a hardware power-on.)
Todo
(On BeagleBone Black, SYS_RESET was a bi-directional signal, but it is only an output from BeagleBone AI to capes on BeagleBone AI.)
Todo
This table needs entries
P9.32 |
P9.33 |
P9.34 |
P9.35 |
P9.36 |
P9.37 |
P9.38 |
P9.39 |
P9.40 |
|
---|---|---|---|---|---|---|---|---|---|
Row 1 |
P9.32 |
P9.33 |
P9.34 |
P9.35 |
P9.36 |
P9.37 |
P9.38 |
P9.39 |
P9.40 |
Todo
Table entries needed
Serial Debug
Todo
Need info on BealgeBone AI serial debug
USB 3 Type-C
Todo
Need info on BealgeBone AI USB Type-C connection
USB 2 Type-A
Todo
Need info on BealgeBone AI USB Type-A connection
Gigabit Ethernet
Todo
Need info on BealgeBone AI USB Gigabit Ethernet connection
Coaxial
Todo
Need info on BealgeBone AI u.FL antenna connection
microSD Memory
Todo
Need info on BealgeBone AI uSD card slot
microHDMI
Todo
Need info on BealgeBone AI uHDMI connection
Cape Board Support
There is a Cape Headers Google Spreadsheet which has a lot of detail regarding various boards and cape add-on boards.
See also BeagleBone cape interface spec
Todo
Add BeagleBone-AI content
BeagleBone® Black Cape Compatibility
Todo
Add BeagleBone-AI BeagleBone® Black Cape Compatibility
section content
See BeagleBone cape interface spec for now.
EEPROM
Todo
Add BeagleBone-AI EEPROM
section content
Pin Usage Consideration
Todo
Add BeagleBone-AI Pin Usage Consideration
section content
GPIO
Todo
Add BeagleBone-AI GPIO
section content
I2C
Todo
Add BeagleBone-AI I2C
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UART or PRU UART
This section is about both UART pins on the header and PRU UART pins on the headers we will include a chart and later some code
Todo
Add BeagleBone-AI content
SPI
Todo
Add BeagleBone-AI SPI
section content
Analog
Todo
Add BeagleBone-AI Analog
section content
PWM, TIMER, eCAP or PRU PWM/eCAP
Todo
Add BeagleBone-AI PWM, TIMER, eCAP or PRU PWM/eCAP
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eQEP
Todo
Add BeagleBone-AI eQEP
section content
CAN
Todo
Add BeagleBone-AI CAN
section content
McASP (audio serial like I2S and AC97)
Todo
Add BeagleBone-AI McASP (audio serial like I2S and AC97)
section content
MMC
Todo
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section content
LCD
Todo
Add BeagleBone-AI LCD
section content
PRU GPIO
Todo
Add BeagleBone-AI PRU GPIO
section content
CLKOUT
Todo
Add BeagleBone-AI CLKOUT
section content
Expansion Connector Headers
Todo
discuss header options for working with the expansion connectors per https://git.beagleboard.org/beagleboard/beaglebone-black/-/wikis/System-Reference-Manual#section-7-1
Signal Usage
Todo
Add BeagleBone-AI Signal Usage
section content
Cape Power
Todo
Add BeagleBone-AI Cape Power
section content
Mechanical
Todo
Add BeagleBone-AI Mechanical
section content