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5 atx mode, 6 single supply mode, Atx mode – Kontron COMe-bHL6 User Manual

Page 24: Single supply mode, Come-bhl6 / product specification

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COMe-bHL6 / Product Specification

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 8.5V - 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 8.5V - 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.

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