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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 COMe-cEL6 supports the Advanced Configuration and Power Interface (ACPI) version 6.0 to implement features
such as power button, sleep button, and suspend and wake 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 state (S5)
If power is removed, the wake-up event (S0) requires 12 V VCC to power on the module.
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 7: Power Supply Control Settings
COMe Signal
Power Button
(PWRBTN#)
Power Good
(PWR_OK)
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Pin
Description
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
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 prevents the 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.
COMe-cEL6 - User Guide, Rev.1.2
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