Kontron COMe-bSC2 - Manual (Page 22)

COMe-bSC2 / Product Specification
3.7 Power Control
Power Supply
The COMe-bSC2 supports a power input from 8.5V - 18V (20V@nonECC). The supply voltage is applied through the VCC pins
(VCC) of the module connector.
Power Button (PWRBTN#)
The power button (Pin B12) is available through the module connector described in the pinout list. To start the module via
Power Button the PWRBTN# signal must be at least 50ms (50ms ≤ t < 4s, typical 400ms) at low level (Power Button Event).
Pressing the power button for at least 4seconds will turn off power to the module (Power Button Override).
Power Good (PWR_OK)
The COMe-bSC2 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 3.3V and must be high level to power on
the module.
Reset Button (SYS_RESET#)
The reset button (Pin B49) is available through the module connector described in the pinout list. The module will stay in
reset as long as SYS_RESET# is grounded. If available, the BIOS setting for “Reset Behavior” must be set to “Power Cycle”.
Modules with Intel® Chipset and active Management Engine do not allow to hold the
module in Reset out of S0 for a long time. At about 10s holding the reset button the ME will
reboot the module automatically
SM-Bus Alert (SMB_ALERT#)
With an external battery manager present and SMB_ALERT# (Pin B15) connected the module always powers on even if
BIOS switch “After Power Fail” is set to “Stay Off”.
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