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Figure 11-7.
Jetson TX2 NX UART Connections
Tegra – UART
UART
UART2_TX
UART2_RX
UART2_RTS
UART2_CTS
UART3_TX
AO
UART3_RX
UART3_RTS
UART3_CTS
DEBUG
UART1_TX
UART1_RX
Table 11-9.
UART Signal Connections
Ball Name
Type
UART[2:0]_TXD
O
UART[2:0]_RXD
I
UART[1:0]_CTS*
I
UART[1:0]_RTS*
O
11.6
Debug
Jetson TX2 NX supports a UART for debugging purposes. The UART intended for debug is
UART1 with is routed to a level shifter then to a 6-pin UART header on the developer kit carrier
board.
Table 11-10.
Jetson TX2 NX Debug UART Description
Module Pin Name
Pin #
Tegra X2 Signal
(See Note)
238
UART2_RXD
UART1_RX
236
UART2_TXD
UART1_TX
Notes:
1.
In the Type/Dir column, Output is from Jetson TX2 NX. Input is to Jetson TX2 NX. Bidir is for Bidirectional signals.
2.
The direction for UART2_RXD is true when used for this function. Otherwise as a GPIO, the direction is bidirectional.
NVIDIA Jetson TX2 NX
Jetson
1.8V
VCC
OE*
GND
1.8V
VCC
OE*
1.8V
VCC
GND
OE*
GND
Termination
Usage/Description
UART 2 receive
UART 2 transmit
UART 0_TXD
99
UART 0_RXD
Routed to M.2 Key E
101
UART 0_RTS*
Connector on DevKit
103
UART 0_CTS*
105
UART 1_TXD
203
UART 1_RXD
Routed to 40-pin Expansion
205
UART 1_RTS*
Header on DevKit
207
UART 1_CTS*
209
UART 2_TXD
Routed to Debug
236
UART 2_RXD
Serial Port on DevKit
238
Description
UART Transmit: Connect to peripheral RXD pin of device
UART Receive: Connect to peripheral TXD pin of device
UART Clear to Send: Connect to peripheral RTS pin of device
UART Request to Send: Connect to peripheral CTS pin of device
Usage on DevKit
Carrier Board
Serial port
Miscellaneous Interfaces
Direction
Pin Type
Input
CMOS – 1.8V
Output
DG-10141-001_v1.1 | 64
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