COMe-bTL6 - User Guide. Rev. 1.5
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2.4.1.1.
Power Supply Voltage Rise Time
The input voltage rise time is 0.1 ms to 20 ms from input voltage ≤10% to nominal input voltage. To comply with the
ATX specification there must be a smooth and continuous ramp of each DC input voltage from 10 % to 90 % of the DC
input voltage final set point.
2.4.1.2.
Power Supply Voltage Ripple
The maximum power supply voltage ripple and noise is 100 mV peak-to-peak measured over a frequency bandwidth
of 0 MHz to 20 MHz. The voltage ripple, must not cause the input voltage range to be exceeded.
2.4.1.3.
Power Supply Inrush Current
The maximum inrush current at 5 V standby is 2 A. From states G3 (module is mechanically completely off, with no
power consumption) or S5 (module appears to be completely off) to state S0 (module is fully usable) the maximum
inrush current meets the SFX Design Guide.
2.4.2.
Power Management
The Advanced Configuration and Power Interface (ACPI) 6.0 hardware specification supports features such as power
button and suspend states. The power management options are available within the BIOS set up menu:
Advance>ACPI
Settings>
2.4.2.1.
Suspend States
If power is removed, 5 V can be applied to the V_5V_STBY pins to support the ACPI suspend-states:
Suspend to RAM (S3)
Suspend-to-Disk (S4)
Soft-off (S5)
If power is removed, the wake-up event (S0) requires 12 V VCC to power on the module for
normal operation.
2.4.2.2.
Power Supply Control Settings
Power supply control settings are set in the BIOS and enable the module to shut down, rest and wake from standby.
Table 21: Power Supply Control Settings
COMe Signal
Pin
Description
Power Button
(PWRBTN#)
B12
A PWRBTN# falling edge signal creates power button event (50 ms ≤ t < 4 s, typical
400 ms) at low level). Power button events can be used to bring a system out of S5
soft-off and other suspend states, as well as powering the system down. Pressing
the power button for at least four seconds turns off power to the module Power
Button Override
Power Good
(PWR_OK)
B24
Indicates that all power supplies to the module are stable within specified ranges.
PWR_OK signal goes active and module internal power supplies are enabled.
PWR_OK can be driven low to prevent module from powering up until the carrier is
ready and releases the signal.
PWR_OK should not be deactivated after the module enters S0 unless there is a
power fail condition.