Uart; Figure 12-5. Jetson Orin Nx Uart Connections; Table 12-7. Jetson Orin Nx Uart Pin Descriptions - Nvidia Jetson Orin NX Design Manual

12.3

UART

The Jetson Orin NX brings three UARTs out to the main connector. See Figure 11 5 for typical
assignments of the three available UARTs.
Table 12-7. Jetson Orin NX UART Pin Descriptions
Module Pin
Pin # Name Orin Signal
99 UART0_TXD GP32_UART2_TXD
101 UART0_RXD GP33_UART2_RXD
103 UART0_RTS* GP34_UART2_RTS_N
105 UART0_CTS* GP35_UART2_CTS_N
203 UART1_TXD GP70_UART1_TX_BOOT2_STRAP
205 UART1_RXD GP71_UART1_RXD
207 UART1_RTS* GP72_UART1_RTS_N
209 UART1_CTS* GP73_UART1_CTS_N
236 UART2_TXD GP11_UART3_TXD
238 UART2_RXD GP12_UART3_RXD
Notes:
1. In the Direction column, Output is from Jetson Orin NX. Input is to Jetson Orin NX. Bidir is for Bidirectional signals.
2. The direction indicated for the UART pins except for is true when used for that function. Otherwise, these pins support GPIO
functionality and most can support both input and output (bidirectional) functionality. The exception is UART0_TXD, UART0_RTS*
and UART1_TXD. These have output-only buffers on the module to keep them from being affected by connected devices during
boot as they are associated with SoC strapping pins.
Figure 12-5. Jetson Orin NX UART Connections
SoC – UART
GP32_UART2_TXD
GP33_UART2_RXD
GP34_UART2_RTS_N
GP35_UART2_CTS_N
GP70_UART1_TXD_BOOT2_STRAP
GP71_UART1_RXD
GP72_UART1_RTS_N
GP73_UART1_CTS_N
GP11_UART3_TXD
GP12_UART3_RXD
Note: The buffers on UART0_TXD, UART0_RTS* and UART1_TXD are there to prevent connected
devices from changing the pin state during power-on. These pins are associated with SoC
Strapping pins
PRELIMINARY INFORMATION
NVIDIA Jetson Orin NX
Usage and Description
UART 0 Transmit
UART 0 Receive
UART 0 Request to Send
UART 0 Clear to Send
UART 1 Transmit
UART 1 Receive
UART 1 Request to Send
UART 1 Clear to Send
UART 2 Transmit.
UART 2 Receive
Jetson
VCC
1.8V
1.8V
VCC
VCC
OE*
GND
GND
Recommended
Usage
UART general
(i.e. M.2 Key E)
UART general
Debug UART
1.8V
OE*
UART 0_TXD
GND
99
UART 0_RXD
101
UART 0_RTS*
103
UART 0_CTS*
105
OE*
UART 1_TXD
203
UART 1_RXD
205
UART 1_RTS*
207
UART 1_CTS*
209
UART 2_TXD
236
UART 2_RXD
238
DG-10931-001_v0.1 | 66
Miscellaneous Interfaces
Direction Pin Type
Output
Input
Output
Input
Output
CMOS –
1.8V
Input
Output
Input
Output
Input
UART general (i.e.
M.2 Key E)
UART general
Debug UART