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Chapter 1 27
System Power Management
Mechanical off is a condition where all power except the RTC battery has been removed from the system.
1. Initial to On state: When the AC adapter or Battery pack has been plugged into the system, the I WPC781
will be reset and initial all output pins then the system goes into Initial state and waiting for power on event. If
the power button is pressed then the system will go into the ON state.
2. ON to Standby state: The system will go into the Standby state when HM55 receives the POS command.
3. ON to Suspend state: The system will go into Suspend state when HM55 receives the S2R command.
4. ON to Hibernate state: The system will go into Hibernate state when HM55 receives the S2D command.
5. ON to Soft Off state: The system will go into Soft Off state when HM55 receives the Soft off command.
6. Standby to ON state: The system will go into ON state when the system receives any wake up events, for
example, keyboard, mouse.
7. Suspend to ON state: The system will go into ON state when the power button is pressed.
8. Hibernate to ON state: The system will go into ON state when the power button is pressed.
9. Soft Off to ON state: The system will go into ON state when the power button is pressed.
Item Initial On Standby Suspend Hibernate Soft Off
Initial 1
On(S0) 234 5
Standby(S1) 6
Suspend(S3) 7
Hibernate(S4) 8
Soft Off(S5) 9