Kontron COMe-bEP7, Руководство пользователя

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COMe-bEP7 Module User Guide
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6/ Power Control
6.1. Power Supply
The COMe-bEP7 supports a power input from 8.5 V to 20 V in the commercial grade
version, but 12 V in the industrial version. The supply voltage is applied through the
VCC pins (VCC) of the module connector.
Optionally, 5 V +/- 5% can be applied to the V_5V_STBY pins and allows support for
wake-up suspend-to-disk and soft-off state when the VCC power is removed.
Suspend-to-RAM (S3) is not supported by the AMD EPYC product family.
6.2. Power Button (PWRBTN#)
The power button (Pin B12) is available through the module connector described in
the pin-out list. To start the module using Power Button the PWRBTN# signal must
be at least 50ms (50 ms ≤ t < 4 s, typical 400 ms) at low level (Power Button Event).
Pressing the power button for at least 4 s will turn off power to the module (Power
Button Override).
6.3. Power Good (PWR_OK)
The COMe-bEP7 provides an external input for a power-good signal (Pin B24). The
implementation of this subsystem complies with the COM Express® Specification.
PWR_OK is internally pulled up to 3.3 V and must be high level to power on the
module. This is typically driven by the ATX power supply PWR_OK signal. The carrier
needs to release the signal when ready.
6.4. Reset Button (SYS_RESET# Signal)
When the SYS_RESET# pin is detected active, 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 to 6 ms regardless of whether the SYS_RESET# input remains
asserted or not.