Kontron COMe-cPC2 User Manual download pdf (Page 17)

COMe-cPC2 / Product Specification

2.4.5 ATX Mode

By connecting an ATX power supply with VCC and 5VSB, 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. VCC can be 8.5V - 18V in ATX Mode. On Computer-on-Modules supporting a

wide range input down to 4.75V the input voltage shall always be higher than 5V Standby (VCC > 5VSB).

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

2.4.6 Single Supply Mode

In single supply mode (or automatic power on after power loss) without 5V Standby 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

this mode and VCC can be 8.5V - 18V.

To power on the module from S5 state press the power button or reconnect VCC. Suspend/Standby States are not

supported in 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

Signals marked with “x” are not important for the specific power state. There is no

difference if connected or open.

All ground pins have to be tied to the ground plane of the carrier board.

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Kontron COMe-cPC2 User Manual Page 17