COMe-bSL6 – User Guide Rev. 1.4
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2.4.5.
Power Management
Power management options are available within the BIOS setup.
ACPI Settings
ACPI 4.0
Miscellaneous Power
Management
Supported in BIOS setup menu
Within the BIOS setup If VCC power is removed, 5 V ±5 % can be applied to the V_5V_STBY pins to support the
following suspend-states:
Suspend to RAM (S3)
Suspend-to-disk / Hibernate (S4)
Soft-off state (S5)
The Wake-Up event (S0) requires VCC power, as the board is running.
2.4.6.
Power Supply Control Settings
The following table provides a description of the COMe-bSL6’s power supply control settings.
Power Button
(PWRBTN#)
Pin
B12
To start the module using the power button, the PWRBTN# signal must be at
least 50 ms (50 ms ≤ t < 4 s, typical 400 ms) at low level (Power Button
Event). Pressing the power button for at least four seconds turns off power
to the module (Power Button Override).
Power Good
(PWR_OK)
Pin
B24
PWR_OK is internally pulled up to 3.3 V and must be at the high level to power
on the module. This can be driven low to hold the module from powering up as
long as needed. The carrier needs to release the signal when ready.
Low level prevents the COM3-module from entering the S0 state. A falling edge
during S0 will cause a direct switch to S5 (Power Failure).
Reset Button
(SYS_RESET#)
Pin
B49
When the SYS_RESET# pin is detected active (falling edge triggered), it
allows the processor to perform a “graceful” reset, by waiting up to 25 ms for
the SMBus to go idle before forcing a reset, even though activity is still
occurring. Once the reset is asserted, it remains asserted for 5 ms to 6 ms
regardless of whether the SYS_RESET# input remains asserted or not.
SM-Bus Alert
(SMB_ALERT#)
Pin
B15
With an external battery manager present and SMB_ALERT #connected, the
module always powers on even if the BIOS switch “After Power Fail” is set to
“Stay Off”.
