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12.6
Debug
Jetson Orin NX supports a UART for debugging purposes. The UART intended for debug is
UART2.
Table 12-13.
Jetson Orin NX Debug UART Pin Descriptions
Module Pin
Pin #
Name
Orin Signal
238
UART2_RXD
GP11_UART3_TXD
236
UART2_TXD
GP12_UART3_RXD
Note: In the Direction column, Output is from Jetson Orin NX. Input is to Jetson Orin NX. Bidir is for Bidirectional signals.
Table 12-14.
Debug UART Connections
Module Pin Name
Type
UART2_TXD
O
UART2_RXD
I
Figure 12-8.
Debug UART Connections
Jetson
SoC
GP11_UART3_TXD
GP12_UART3_RXD
Note: If level shifter is implemented, pull-up is required on the RXD line on the non-Jetson Orin
NX side of the level shifter. This is required to keep the input from floating and toggling when no
device is connected to the debug UART.
PRELIMINARY INFORMATION
NVIDIA Jetson Orin NX
Usage and Description
UART 2 receive
UART 2 transmit
Termination
If level shifter implemented,
100kΩ to supply on the non-
Jetson Orin NX side of the device.
VDD_1V8
0.1uF
UART 2_TXD
236
UART 2_RXD
238
100kΩ
Recommended
Usage
Debug UART
Description
UART #2 Transmit: Connect to RX pin of serial device
UART #2 Receive: Connect to TX pin of serial device
VDD_3V3_SYS
0.1uF
Level Shifter
VCCA
VCCB
A1
B1
A2
B2
OE
GND
Miscellaneous Interfaces
Direction
Pin Type
Input
CMOS – 1.8V
Output
RXD_LS
TXD_LS
DG-10931-001_v0.1 | 69
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