Power Button Supervisor Mcu Power-On; Table 6-2. Power Button Supervisor Control Signals - Nvidia Jetson Orin NX Series Product Manual

6.1.1

Power Button Supervisor MCU Power-On

The NVIDIA carrier board reference design implements a power button supervisor. This
supervisor is a low power device meant to intercept push-button (momentary) switches to
control ON/Enable signals to the module Power Sequencer or PMIC and main processor. This
supervisor is always powered and allows close to complete system power OFF while providing
proper timing for ON/OFF signals to the system. The selected MCU to perform this function is
the EFM8SB10F2G-A-QFN20 from Silicon Labs.
Note: Designs that intend to follow the NVIDIA carrier board design and include the
EFM8SB10F2G-A-QFN20 MPU for Power Button control need to replicate the circuitry on the
latest P3768 carrier board exactly. NVIDIA provides the binary and source on the Jetson
Download Center. The customer should get the flashing instructions from Silicon Labs.
Otherwise, another solution designed to meet the requirements earlier in this chapter can be
used.
Table 6-2. Power Button Supervisor Control Signals
Associated Orin
Button MCU Module Pin
Signal Name Name
BMCU_PWR_BTN* SLEEP/WAKE*
BMCU_P01
BMCU_P02
BMCU_P03
BMCU_UART_TX
BMCU_P05
BMCU_ACOK
BMCU_GOOD
FORCE_OFF* SHUTDOWN_
REQ*
BUCK_3V3_EN SYS_RESET*
BMCU_BRD_SEL
VIN_PWR_ON
BMCU_POWER_EN POWER_EN
PWR_BTN_BUF*
BMCU_P17
BMCU_C2D
PRELIMINARY INFORMATION
Jetson Orin NX Series and Jetson Orin Nano Series
Associated
Module Pin Trigge
# I/O Type r Level
Input
240 Level
(debounced)
Input Edge
(debounced)
Input Level
233 Input Level
239 Input Edge
Input
Output
237 Output
Drive
Mode Description
OD
Power Button
(HiZ)
10kΩ Pull-up to 3V3_AO
10kΩ Pull-up to 3V3_AO
No Connect
PP Test point for FW debug
No Connect
OD Determine when VDD_5V_SYS
(HiZ) power is supplied. Used to
select either button power on
or auto-power on.
OD 10kΩ Pull-up to 3V3_AO
(HiZ)
OD Triggers shutdown sequence
(HiZ)
OD Carrier board supply enable
(HiZ)
OD 10kΩ Pull-up to 3V3_AO
(HiZ)
PP Enables power to module if
wide range (5V-20V)
PP Power On/Off control to Power
Sequencer/PMC. Also Enable
input to main 5V supply
(VDD_5V)
No Connect
No Connect
Data for programming/debug
DG-10931-001_v1.1 | 21
Power
MCU Pin
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P1.0
P1.1
P1.2
P1.3
P1.5
P1.6
P1.7
P2.7_C2
D