COMe-bSL6 – User Guide Rev. 1.4
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2.4.7.
Power Supply Modes
2.4.7.1.
ATX Mode
By connecting an ATX power supply with VCC and 5 VSB, PWR_OK is set to low and VCC is off. Pressing the power
button sets the ATX PSU setting PWR_OK to high and powers VCC. The PS_ON# signal generated by SUS_S3# (A15)
indicates that the system is in Suspend to RAM state. An inverted copy of SUS_S3# on the carrier board may be used
to enable non-standby power on a typical ATX supply.
The input voltage must always be higher than 5 V Standby (VCC > 5 VSB) on Computer-on-Modules supporting a wide
input voltage range down to 4.75 V.
Table 14: ATX Mode Settings
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
(x) – Defines that there is no difference if connected or open.
2.4.7.2.
Single Supply Mode
In single supply mode, without 5V standby the module starts automatically when VCC power is connected and Power
Good input is open or at high level (internal PU to 3.3 V). PS_ON# is not used in this mode and VCC can be 8.5 V to 20 V.
To power on the module from the S5 state, press the power button or reconnect VCC. Suspend/Standby states are not
supported in single supply mode.
Table 15: Single Supply Mode Settings
State
PWRBTN#
PWR_OK
V5_StdBy
VCC
G3
0V/x
0V/x
0V/x
0V/x
G3
→
S0
high
open / high
open
connecting VCC
S5
high
open / high
open
VCC
S5
→
S0
PWRBTN event
open / high
open
reconnecting VCC
(x) – Defines that there is no difference if connected or open.
All ground pins must be connected to the carrier board’s ground plane.