Atx Mode; Single Supply Mode; Table 23: Atx Mode; Table 24: Single Supply Mode - Kontron COMe-bID7 User Manual

6.5. 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# through inversion. VCC can be 8.5 V – 20 V in ATX Mode. On Computer-
on-Modules supporting a wide range input down to 4.75 V the input voltage shall always be higher than 5 V Standby
(VCC > 5VSB).

Table 23: ATX Mode

State PWRBTN#
G3 x
S5 high
S5 → S0
PWRBTN Event
S0 high

6.6. Single Supply Mode

In single supply mode, 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). VCC can be 8.5 V – 20 V.
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.

Table 24: Single Supply Mode

State PWRBTN#
G3 0
G3 → S0
high
S5 high
S5 → S0
PWRBTN Event
All ground pins have to be tied to the ground plane of the carrier board.
If any of the supply voltages drops below the allowed operating level longer than the
specified hold-up time, all the supply voltages should be shut down and left OFF for a time
long enough to allow the internal board voltages to discharge sufficiently.
If the OFF time is not observed, parts of the board or attached peripherals may work
incorrectly or even suffer a reduction of MTBF.
The minimum OFF time depends on the implemented PSU model and other electrical factors
and needs to be measured individually for each case.
www.kontron.com
PWR_OK V5_StdBy
x 0V
low 5V
low → high
5V
high 5V
PWR_OK
0
open / high
open / high
open / high
COMe-bID7 User Guide Rev. 1.2
PS_ON#
x
high
high → low
low
V5_StdBy VCC
0 0
OPEN connecting VCC
OPEN VCC
OPEN reconnect VCC
VCC
0V
0V
0 V→ VCC
VCC
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