Kontron COMe-cPV2(v1.0) - Manual (Page 49)

Kontron microETXexpress-PV User’s Guide
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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 4.5V.
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 15: 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.
4.1.17 Miscellaneous Circuits
Speaker
The implementation of this subsystem complies with the COM Express®
Specification. For additional implementation information, refer to the PICMG
COM Express® Design Guide.
Battery