ACT8828 datasheet(16/49 Pages) ACTIVE-SEMI

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SYSTEM MANAGEMENT

ACT8828

Rev 3, 24-Sep-09

Active-Semi

Innovative Power

- 16 -

www.active-semi.com

ActivePMU

TM and ActivePathTM are trademarks of Active-Semi.

2CTM is a trademark of Philips Electronics.

nPBIN

OUT1, OUT2, OUT3

ON1, ON2, ON3, ON4

OUT4

First Push

Button

Assert

Power-Hold

Second Push

Button

Release

Button

System

Shutdown

Reset Time Enable

260ms

nRSTO

nIRQ

Once a successful power-up routine is completed, a

shutdown process may be initiated by asserting

nPBIN a second time, typically as the result of

pressing the push-button. Although the shutdown

process is completely software-controlled, a typical

shutdown sequence proceeds as follows: The

second assertion of nPBIN asserts nPBIN and

interrupts the microprocessor, which then initiates

an interrupt service routine to reveal that nPBIN has

been asserted. If there is no input to the charger,

then the microprocessor disables each regulator

according to the sequencing requirements of the

system, the microprocessor disables each regulator

according to the sequencing requirements of the

system, then the system will finally be disabled

when ON1, ON2, ON3, and ON4 have been de-

asserted.

FUNCTIONAL DESCRIPTION CONT’D

Figure 4:

Sequence B

Figure 5:

Sequence C

CHG_IN

nPBIN

First Push

Button

Assert

Power-Hold

Second Push

Button

Release

Button

System

Shutdown

OUT1

260ms

~100ms

94% of VOUT1

Enable Qualification

OUT2, OUT3

ON1, ON2, ON3, ON4

OUT4

Reset Time Enable

nRSRO

nIRQ

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