Kontron COMe-cBT6, Руководство пользователя

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COMe-cBT6 / Introduction
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3.5.5. 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 4.75 - 20V 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
3.5.6. 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 4.75 - 20V.
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.