Power Discharge; Module Power-On Type Detection & Control - Nvidia Jetson TX2 Manual

Figure 7. VIN_PWR_BAD# Detection Test Circuit for Uncontrolled Power -down Case
VDD_IN
VIN_PWR_BAD#
Voltage measured at
USB0_OTG_ID pin

3.4 Power Discharge

In order to meet the Pow er Dow n requirements, discharge circuitry is required. In the figure below the DISCHARGE signal is
generated, based on a transition of the CARRIER_POWER_ON signal or the removal of the main supply (VDD_MUX/V DD_IN).
When DISCHARGE is asserted, VDD_5V0_IO_SYS, VDD_3V3_SYS, VDD_1V8 and VDD_3V3_SLP are forced to GND in a
controlled manner. Removal of the VDD_MUX supply also causes VIN_PWR_BAD# to go active w hich causes the module to
initiate a controlled shut dow n.
Figure 8. Power Discharge
VDD_MUX
BAT54ALT1
E
B MMBT
4403
C
10uF 10uF
4.7uF 1uF
CARRIER_PWR_ON
(Jetson Module pin A48)
Note The figure above is based on the carrier board reference design. Refer to the latest carrier board reference design
(P2597_B04 or later) for details.
3.5 Module Power-on Type Detection & Control
The follow ing describes w hat is required in a carrier board design to support Jetson TX2 and Jetson TX2i in a design that
requires a pow er button press to pow er the system on. If a design requires the system to pow er on immediately after the main
pow er supply is connected/enabled, see the "Optional Auto-Pow er-On Support" section.
Jetson TX2i uses a different PMIC (MAX20024) than Jetson TX2 (MAX77620). Due to the PMIC architecture differences, if the
platform requires a button press, the Pow er-on mechanism w ill need to change, from Edge to level triggered. This w ill require
the carrier boards to detect w hether a Jetson TX2 module or Jetson TX2i module is installed. A Reserved pin on the connector
JETSON TX2/TX2i OEM PRODUCT | DESIGN GUIDE | 20180618
~20%
droop
2.9V
>20ms
VIN_PWR_BAD#
(Jetson Module Pin B8)
D
NTR4001
G
NT1G
S
BAT54CW
DISCHARGE
VDD_MUX
D
NTR4003
G
NT1G
S
NVIDIA Jetson TX2/TX2i OEM Product Design Guide
VDD_5V0_IO_SYS
100Ω
D
NTR4003
VDD_3V3_SY S
G
NT1G
47Ω
S
D
NTR4003
G
NT1G
36Ω
S
D
NTR4003
G
NT1G
S
NTR4003
NT1G
G
VDD_5V0_IO_SYS
BAT54CW
FDV301N
D
VDD_3V3_SLP
G
S
VDD_1V8
VDD_3V3_SLP
47Ω
VDD_12V_SLP
D
470Ω
470Ω
S
D
NTR4003
VDD_5V0_IO_SLP
G
NT1G
100Ω
S
D
NTR4003
G
NT1G
S
15