Kontron COMe-cSP2 - Manual (Page 46)

COMe-cSP2 / COMe-cSP2 Connector
41
ATX Mode / Single Supply Mode
ATX Mode:
By connecting an ATX power supply, PWR_OK is set to low level and VCC is off. Press the power button to enable the
ATX PSU setting PWR_OK to high level and powering on VCC. The ATX PSU is controlled by the PS_ON# signal which is
generated by SUS_S3# via inversion.
ATX Mode
State PWRBTN# PWR_OK V5_StdBy PS_ON# VCC
G3 x x 0V x 0V
S5 high low 5V high 0V
S5 -> S0 PWRBTN Event low -> high 5V high -> low 0 V-> VCC
S0 high high 5V low VCC
Single Supply Mode:
In single supply mode the module will start automatically when VCC power is connected and Power Good input is open
or at high level (internal PU to 3.3V). PS_ON# is not used in singly supply mode.
To power on the module from S5 state press the power button or reconnect VCC
Single supply mode
State PWRBTN# PWR_OK V5_StdBy VCC
G3 x x x 0
G3 -> S0 high open / high x connecting VCC
S5 high open / high x VCC
S5 -> S0 PWRBTN Event open / high x reconnecting VCC
- All columbs marked with an ―x‖ are not important for the specific power state.
- All ground pins have to be tied to the ground plane of the carrier board.