Table 29 Miscellaneous Signal Descriptions; Table 30 Power And System Management Signal Descriptions - Congatec COM Express conga-MA5 User Manual

Table 29 Miscellaneous Signal Descriptions
Signal Pin # Description
SPKR B32 Output for audio enunciator, the "speaker" in PC-AT systems
WDT B27 Output indicating that a watchdog time-out event has occurred.
FAN_PWMOUT B101 Fan speed control. Uses the Pulse Width Modulation (PWM) technique
to control the fan's RPM.
FAN_TACHIN B102 Fan tachometer input.
TPM_PP A96 Physical Presence pin of Trusted Platform Module (TPM). Active high.
Note
For the correct fan control (FAN_PWMOUT, FAN_TACHIN) implementation, see the COM Express Design Guide.
Table 30 Power and System Management Signal Descriptions
Signal Pin # Description
PWRBTN# B12 Power button to bring system out of S5 (soft off), active on falling edge.
Note: For proper detection, assert a pulse width of at least 16 ms.
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.
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 main power input (VIN) that falls below the minimum
specification, a watchdog timeout, or may be initiated by the module software.
PWR_OK B24 Power OK from main power supply. A high value indicates that the power is good.
SUS_STAT# B18 Suspend Status: Indicates the system will enter a low power state soon. Used to notify LPC devices.
SUS_S3# A15 Indicates system is in Suspend to RAM state. Active-low output. An inverted copy of SUS_S3# on the
carrier board may be used to enable the non-standby power on a typical ATX power supply.
SUS_S4# A18 Indicates system is in Suspend to Disk (S4) or Soft Off (S5) state. Active low output.
SUS_S5# A24 Indicates system is in Soft Off state.
WAKE0# B66 PCI Express wake up request signal.
WAKE1# B67 General purpose wake up signal. May be used to implement a wake-up request from an external device.
BATLOW# A27 Battery low input. This signal may be driven low by external circuitry to signal that the system battery is low. I 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.
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.
Copyright © 2017 congatec AG
I/O PU/PD
O 3.3V
O 3.3V PD 10K
O 3.3V
I PU 47K 3.3V
I 3.3V PD 10K
MA50m17
Comment
12V tolerant
Requires a fan with a two
pulse output. 12V tolerant.
I/O PU/PD Comment
I 3.3VSB PU 10k 3.3VSB
I 3.3VSB PU 10k 3.3VSB
O 3.3VSB
I 3.3V PU 10k
O 3.3VSB
O 3.3VSB
O 3.3VSB Same signal as
SUS_S5#
O 3.3VSB Same signal as
SUS_S4#
I 3.3VSB PU 10k 3.3VSB
I 3.3VSB PU 10k 3.3VSB
PU 10k 3.3VSB
I 3.3VSB PU 47k 3.3VSB
I 3.3VSB PU 47k 3.3VSB
50/60