Kontron COMe-cPV2(v1.4) - Manual (Page 49)

Kontron microETXexpress-PV User’s Guide
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Table 16: ATX Mode
State PWRBTN# PWR_OK V5_StdBy PS_ON# VCC
S3 x x 5V 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
Single Supply (Battery) Mode:
To enable the single supply mode the BIOS setup must be changed. The “Battery
Mode” must be enabled from the Boot menu. Setting “Power Scheme” option to
“Battery Mode” in the BIOS will enable the following features:
» The PWR_OK# state is ignored and the input voltage monitoring will be
enabled
An internal voltage monitor will let the board start (after a power
button event or self-power up) when the input voltage is above 4.75V.
The voltage monitor accomplishes this by controlling, via the CPLD, the
BATLOW# signal of the ICH8M. When BATLOW# is asserted the ICH8M will
defer the platform to leave the power states S3 – Suspend to RAM, S4 –
Suspend to disk or S5 – Soft off. Once BATLOW# goes inactive the ICH8M
will let the platform transition to S0.
» Onboard debug LED will be disabled
The onboard debug LED will be turned off to reduce the power
consumption, especially when not in S0.
Table 17: Single Supply Mode
State PWRBTN# PWR_OK V5_StdBy VCC (4.75-
18V)
Note
S3 x x 5V VCC 3
S3 -> S0 PWRBTN
Event x x VCC
S5 x x 5V VCC 3
S5 -> S0 PWRBTN
Event x x VCC
NOTES: 1) Columns marked “x” are not relevant for the specified power
state.
2) All ground pins have to be tied to the ground plane of the carrier
board.
3) In suspend either V5_StdBy AND/OR VCC can be powered.