Intel Pentium M Processor Datasheet

Intel
®
Pentium
®
M Processor Datasheet 15
Low Power Features
2.4 Processor Power Status Indicator (PSI#) Signal
The Intel Pentium M processor incorporates the PSI# signal that is asserted when the processor is
in a low power (Deep Sleep or Deeper Sleep) state. This signal is asserted upon Deep Sleep entry
and deasserted upon exit. PSI# can be used to improve the light load efficiency of the voltage
regulator, resulting in platform power savings and extended battery life. PSI# can also be used to
simplify voltage regulator designs since it removes the need for integrated 100 µs timers required
to mask the PWRGOOD signal during Deeper Sleep transitions. It also reduces PWRGOOD
monitoring requirements in the Deeper Sleep state.