Kontron COMe-cSP2 - Manual (Page 45)

COMe-cSP2 / COMe-cSP2 Connector
40
4.3.9 Power Control
Power Good (PWR_OK)
The COMe-cSP2 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.
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) at low level (Power Button Event).
Pressing the power button for at least 4seconds will turn off power to the module (Power Button Override).
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.
Power Supply
The COMe-cSP2 has a wide range power input from 8.5 to 18V DC. The supply voltage is applied through 42pins (VCC)
of the module connector. In ATX mode with 5V standby voltage the VCC input must be higher than the standby
voltage.
In general, single supply mode means the module starts as soon as power is applied to the module, ATX mode is for
power button controlled operation. A powerloss function cannot be implemented in the BIOS setup, because there is
no Southbridge available on the module. That is where this function is usually managed.