7-10
System Power
Battery Charge Level and Power Management
The pen tablet monitors the voltage of the battery pack. When the voltage drops to low levels, the system
is forced into Idle or Suspend mode to increase battery life and prevent data loss. Table 7-5 describes
system operation for different battery charge levels.
Table 7-5 Low Battery Modes
Mode
Description
Normal mode:
Battery charge 12% to 100% or
system connected to external power.
Power management features operate normally.
Low battery mode:
Battery charge below 12%
CPU speed is reduced to the speed selected for
Low Battery CPU Speed BIOS option.
Only one “cell” is displayed (flashing) in the
Battery Gauge icon.
The low battery alarm (periodic audible “beep”)
is sounded if the Audio BIOS option is enabled.
Critically low battery mode:
Battery charge below critical
threshold.
The system is forced to suspend using
Suspend-to-RAM mode. The system will not
resume until a sufficiently charged battery pack
is installed or external power is connected.
The power icon flashes indicating that the
system is in Suspend mode and no “cells” are
displayed in the battery gauge icon.
Note:
• In the event of a critically low battery, the
system is forced into Suspend-to-RAM
mode regardless of the Suspend Mode
setting in BIOS Setup.
• The percent of full battery charge cannot be
determined for the critically low battery level
because the circuit that detects the critically
low voltage level monitors the battery
voltage independent of the PMU.
Microsoft Corp. Exhibit 1020
Summary of Contents for Stylistic 2300
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