Nvidia Jetson Orin NX User Manual

Power
PRELIMINARY INFORMATION
NVIDIA Jetson Orin NX DG-10931-001_v0.1 | 15
POWER_EN

POWER_EN is a level active signal. When high, the system powers on or stays on. When low,
the system powers down or stays off.
SYS_RESET*

SYS_RESET* is bidirectional. The signal is controlled by the PMIC during power-on and
power-off. When the system is powered on,
SYS_RESET* can be driven by the carrier board
to reset the module. This results in a full system power cycle.
 The
SYS_RESET* signal is asserted by the PMIC during power-on.

SYS_RESET* is not asserted externally during the power-down sequence. When POWER_EN is
de-asserted, the PMIC performs a power down sequence which includes asserting
SYS_RESET*.
SHUTDOWN_REQ*

SHUTDOWN_REQ* is driven active (low) by the module if the system must be shut down, due
to a software shutdown request, over-temperature event, undervoltage event, or other
faults. The power control logic on the carrier board must drive
POWER_EN inactive (low) if
SHUTDOWN_REQ* is asserted.

SHUTDOWN_REQ* is not driven during power-on. It is pulled up to the VDD_IN supply, so stays
inactive. If the system is on and reset is driven low, the PMIC will initiate a full power cycle
and start the power-on sequence. Again,
SHUTDOWN_REQ* is not asserted. SHUTDOWN_REQ*
will only go low when the module determines the system needs to shut down.

SHUTDOWN_REQ* comes from a latch on module and is cleared when POWER_EN goes low.
 If
SHUTDOWN_REQ* is asserted, the carrier board must de-assert POWER_EN as soon as
possible.
Power Rail Discharge
To satisfy the power down sequencing requirement and prevent unwanted back drive from the
carrier board to the module, the following must be true:
 The carrier board 3.3V power supply that powers any module I/O must be off within 1.5 ms
of
SYS_RESET* assertion.
 The 1.8V power supply that powers any module I/O must be off within 4 ms.
 The power rails should be fully discharged before attempting to power back up.
Module ID
To support both legacy modules that take 5V only on
VDD_IN as well as the wide range that
Jetson Orin NX can support (5V-20V) on
VDD_IN, one of the original SODIMM GND pins (Pin 217)
is re-tasked as a module ID pin. Legacy modules will have this pin tied to GND. Jetson Orin NX
modules will have this pin floating. A pull-up is required on the carrier board on the GND or
module ID pin if it will support the wide range
VDD_IN input voltage. This pull-up will cause the
module ID level to be high if a Jetson Orin NX module is installed. The module ID pin should be
used on the carrier board to determine if only 5V is supplied to
VDD_IN (legacy module) or the
full Jetson Orin NX
VDD_IN range.

Nvidia Jetson Orin NX Specifications

General

Brand	Nvidia
Model	Jetson Orin NX
Category	Computer Hardware
Language	English