ACT8897Q4I11C-T View Datasheet(PDF) - Active-Semi, Inc
Part Name
Description
MFG CO.
'ACT8897Q4I11C-T' PDF : 32 Pages View PDF
ACT8897
Rev 2, 05-Sep-13
SLEEP Mode Sequence
The ACT8897 supports Samsung S5PC100,
S5PC110 and S5PV210 processors’ SLEEP mode
operation. Once a successful power-up routine has
been completed, SLEEP mode may be initiated
through a variety of software-controlled
mechanisms.
SLEEP mode is typically initiated when the user
presses the push-button during normal operation.
Pressing the push-button asserts the nPBIN input,
which asserts the nPBSTAT output, which
interrupts the processor. In response to this
interrupt the processor should de-assert
PWREN(XPWRRGTON), disabling REG2, REG3,
REG4, REG6 and REG7. PWRHLD should remain
asserted during SLEEP mode so that REG1 and
REG5 remain enabled.
Waking up from SLEEP mode is typically initiated
when the user presses the push-button again,
which enables REG2, REG3, REG4, REG6 and
REG7 and asserts nPBSTAT. Processors should
respond by asserting PWREN(XPWRRGTON),
which holds REG2, REG3, REG4, REG6 and REG7
so that normal operation may resume. An external
interrupt , for instance a RTC interrupt, can also
initiate a wake up sequence. When an external
interrupt is sent to the processor, the processor
should response by getting itself ready to wake up
from SLEEP mode first, then assert
PWREN(XPWRRGTON), which enables REG2,
REG3, REG4, REG6 and REG7 so that the normal
operation may resume.
Figure 3:
Enable/Disable Sequence
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