
Chapter 3: Batteries and Power Management
Psion Power States
Psion Mobile Devices Developers Guide
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3.2 Psion Power States
3.2.1 Suspend/resume Cycle
On all Psion computers there is an intermediate state between fully on and suspend. The process—referred
to as the suspend/resume cycle—is as follows:
3.2.2 Comparison of Power States
3.2.3 Fully on
Everything is on.
3.2.4 Standby Mode (Unattended Mode)
In standby mode the processor remains on so any running applications continue executing. Standby mode
consumes more power than suspend mode.
3.2.5 Suspend Mode
In suspend mode the computer is in a power-saving state. When the computer is woken from this state,
operation resumes within a few seconds continuing from where it stopped on suspend.
Suspend mode may occur automatically after a period of inactivity, or when the battery power reserve
drops below a specified threshold. Typically the device goes into suspend mode when the user manually
powers down the computer.
In suspend mode, the display, the keyboard and the peripherals are powered down. The operating system
and any running applications are maintained in their current state, until the power source depletes.
Function Fully On Standby Mode Suspend Mode
Suspend with
Radio off Mode
Power Off Mode
Applications Executing Executing Not executing Not executing CPU powered
down
Display On Off Off Off Off
Touchscreen Unlocked Locked Locked Locked Off
Keyboard Unlocked Locked Locked Locked Off
Radios On On On Off Off
Backlights On Off Off Off Off
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