Copyright
©
2018
congatec
AG
TR44m17
49/65
Note
The congatec COM Express Type 6 and Type 10 modules use a Push-Pull output for the fan_pwm signal instead of the open drain output
specified in the COM Express specification. Although this does not comply with the COM Express specification 3.0, the benefits are obvious.
The Push-Pull output optimizes the power consumed by the fan_pwm signal without functional change.
Table 24
Power and System Management Signal Descriptions
Signal
Pin # Description
I/O
PU/PD
Comment
PWRBTN#
B12
Power button to bring system out of S5 (soft off), active on rising edge.
Note:
For proper detection, assert a pulse width of at least 16 ms.
I 3.3VSB
PU 10K 3.3VSB
SYS_RESET#
B49
Reset button input. Active low input. Edge triggered.
System will not be held in hardware reset while this input is kept low.
Note:
For proper detection, assert a pulse width of at least 16 ms.
I 3.3VSB
PU 10K 3.3VSB
CB_RESET#
B50
Reset output from module to Carrier Board. Active low. Issued by module chipset
and may result from a low SYS_RESET# input, a low PWR_OK input, a VCC_12V
power input that falls below the minimum specification, a watchdog timeout, or may
be initiated by the module software.
O 3.3V
PWR_OK
B24
Power OK from main power supply. A high value indicates that the power is good.
I 3.3V
PU 10K 3.3V
SUS_STAT#
B18
Indicates imminent suspend operation; used to notify LPC devices.
O 3.3VSB
SUS_S3#
A15
Indicates system is in Suspend to RAM state. Active-low output. An inverted copy of
SUS_S3# on the carrier board (also known as “PS_ON”) may be used to enable the
non-standby power on a typical ATX power supply.
O 3.3VSB
SUS_S4#
A18
Indicates system is in Suspend to Disk state. Active low output.
O 3.3VSB
Not supported
SUS_S5#
A24
Indicates system is in Soft Off state.
O 3.3VSB
WAKE0#
B66
PCI Express wake up signal.
I 3.3VSB
PU 10K 3.3VSB
WAKE1#
B67
General purpose wake up signal. May be used to implement wake-up on PS/2
keyboard or mouse activity.
I 3.3VSB
PU 10K 3.3VSB
BATLOW#
A27
Battery low input. This signal may be driven low by external circuitry to signal that
the system battery is low, or may be used to signal some other external power-
management event.
I 3.3VSB
PU 10K 3.3VSB
THRM#
B35
Input from off-module temp sensor indicating an over-temp situation.
I 3.3V
PU 10k 3.3V
THERMTRIP#
A35
Active low output indicating that the CPU has entered thermal shutdown.
O 3.3V
PU 10k 3.3V
SMB_CK
B13
System Management Bus bidirectional clock line.
I/O 3.3VSB PU 2.2K 3.3VSB
SMB_DAT#
B14
System Management Bus bidirectional data line.
I/O OD
3.3VSB
PU 2.2K 3.3VSB
SMB_ALERT#
B15
System Management Bus Alert – active low input can be used to generate an SMI#
(System Management Interrupt) or to wake the system.
I 3.3VSB
PU 10K 3.3VSB
LID#
A103
Lid button. Used by the ACPI operating system for a LID switch.
Note:
For proper detection, assert a pulse width of at least 16 ms.
I 3.3V
PU 47K 3.3VSB
SLEEP#
B103
Sleep button. Used by the ACPI operating system to bring the system to sleep state
or to wake it up again.
Note:
For proper detection, assert a pulse width of at least 16 ms.
I 3.3V
PU 47K 3.3VSB
