4 - Power Management
4.1 - Wake-Up Events
The Karbon 400 platform supports multiple power states. The wake-up events can be configured in
the BIOS. This section describes the supported power management functions and gives information
on protection circuitry for power adapters.
Wake-Up Event
From ACPI State
Comments
Power Button
Low Power
Shutdown, S5, S3
LAN
S5, S3
Must be enabled in BIOS
USB
S3
RTC Wake set by BIOS
S5, S3
Must be enabled in BIOS
RTC Wake set by OS
S3
Must be enabled in OS
Ignition
Low Power
Shutdown, S5, S3
Must be enabled in OS
4.2 - Protection Circuitry
Parameter
Value
Nominal operating voltage (Rated DC value of input)
9~48V
Undervoltage protection trip DC level (system turns off)
6.9V
Maximum safe DC voltage (system not damaged)
57V
Ignition pin operating voltage
8~48V
Ignition pin max safe voltage (system not damaged)
57V
The specified DC levels are the absolute maximum values for function and safety of the system. The
protection circuitry allows for brief transient voltages above these levels without the system turning
off or being damaged. A transient voltage suppressor on the power input allows momentary
excursions above stated limits. For input power consumption and current see
Appendix A
.
The Karbon 400 platform enables a unique low power state for use in automotive or battery powered
applications. When enabled, the total power draw for the system is less than 10mA, making this
solution ideal for systems requiring ultra-low quiescent power draw. This setting must be enabled
from the OS similar to ignition settings. The system may be woken by either the power button or the
ignition pin.
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