Power Management - Samsung S5PC100 User Manual

S5PC100 USER'S MANUAL (REV1.0)
2.4
1 OVERVIEW
The mobile application processor such as S5PC100 needs to consume low power since a mobile product has a
small battery and limited power capacity.
The purpose of power management is to provide various power saving methods to S5PC100 in consuming power
as low as possible under specific application scenarios.
Power management scheme in S5PC100 provides six system power modes, namely: NORMAL, IDLE, DEEP-
IDLE, STOP, DEEP-STOP, and SLEEP.
The brief description of each power mode is as follows:
• NORMAL: The CPU core is running. Application programs can run normally.
• IDLE: The clock of the CPU core is turned off, but the remaining parts are running normally.
• DEEP-IDLE: The CPU core is power-off. The remaining parts can be power-on or power-off.
1) Top domain power on: Sub and Audio domains have the same states as in NORMAL mode.
2) Top domain power off: Sub domains become power-off, but Audio domain is running for low-power MP3
playback.
• STOP: All the blocks, including the CPU core, are clock-off except the RTC and Alive domain. The state of
sub-power-domain power-off domain in NORMAL mode is still power-off in STOP mode. (The Stop mode
should be used for test-purpose only.)
• DEEP-STOP: CPU core is power-off, and the remaining parts of the chip except RTC and ALIVE can have
different configurations according to Top domain status.
1) Top domain power on (clock off): Sub and Audio domains are power-on. (This feature should be used for
test-purpose only.)
2) Top domain power off: Sub domains are power-off.
• SLEEP: The main power is externally turned off using regulators or PMICs (Power Management IC) except the
ALIVE domain and I/O pads. Note that separate RTC power to RTC and external power to I/O pad is still on. If
wakeup event occurs, wakeup reset generated by the Power Management Unit initializes S5PC100 to the
reset states except the ALIVE domain.
Note that 'DEEP' means CPU core is power-off, therefore CPU cores leakage power is minimized in those power
modes (i.e. DEEP-IDLE and DEEP-STOP).
The above description about power mode is provided in view of internal digital logic. The power modes of Cortex-

POWER MANAGEMENT

Power Management
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