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Table 20:
Power Management Signal Descriptions
Signal
Pin Description
PWRBTN#
B12 Power button low active signal used to wake
SYS_RESET#
B49 Reset button input. Active low request for
CB_RESET#
B50 Reset output signal from Module to Carrier
PWR_OK
B24 Power OK status signal generated by the ATX
SUS_STAT#
B18 Suspend status signal to indicate that the
SUS_S3#
A15 S3 Sleep control signal indicating that the
SUS_S4#
A18 S4 Sleep control signal indicating that the
SUS_S5#
A24 S5 Sleep Control signal indicating that the
WAKE0#
B66 PCI Express wake-up event signal.
WAKE1#
B67 General purpose wake-up signal.
BATLOW#
A27 Battery low input. This signal may be driven
COM Express® Carrier Board Design Guide
up the system from S5 state (soft off). This
signal is triggered on the falling edge.
Module to reset and reboot. May be falling
edge sensitive. For situations when
SYS_RESET# is not able to reestablish control
of the system, PWR_OK or a power cycle may
be used.
Board. This signal may be driven low by the
Module to reset external components located
on the Carrier Board.
power supply to notify the Module that the DC
operating voltages are within the ranges
required for proper operation.
system will be entering a low power state soon.
It can be used by other peripherals on the
Carrier Board as an indication that they should
go into power-down mode.
system resides in S3 state (Suspend to
RAM).
system resides in S4 state (Suspend to
Disk).
system resides in S5 State (Soft Off).
low by external circuitry to signal that the
system battery is low. It also can be used
t
i
l
th
t
I/O
I 3.3V
Suspend
CMOS
I 3.3V
Suspend
CMOS
O 3.3V
Suspend
CMOS
I 3.3V
CMOS
O 3.3V
Suspe
nd
CMOS
O 3.3V
Suspend
CMOS
O 3.3V
Suspend
CMOS
O 3.3V
Suspend
CMOS
I 3.3V
Suspend
CMOS
I 3.3V
Suspend
CMOS
I 3.3V
Suspend
CMOS
l
Remarks
Drive with >=10mA
Drive with >=10mA
This signal can be used
to control the ATX
power supply via the
'PS_ON#' signal.
63
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