BD4154FV(2009) データシートの表示（PDF） - ROHM Semiconductor

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BD4154FV
(Rev.:2009)

Power Switch IC for ExpressCard™

ROHM Semiconductor 

BD4154FV

●Timing Chart

System Status

Primary

Auxiliary

OFF

OFF

ON

ON

ON

ON

Technical Note

Power ON/OFF Status of ExpressCardTM

ExpressCardTM Module Status

Power Switch Status

Primary(+3.3V and +1.5V)

Auxiliary(3.3V Aux)

Don’t care

OFF

OFF

De-asserted

Asserted

De-asserted

Asserted Before This

Asserted After This

OFF

ON

OFF

OFF

OFF

OFF

ON

OFF

ON

OFF

ExpressCardTM States Transition Diagram

SYSR=H⇔L

CP#=H

SYSR=L

CP#=H⇔L

V3AUX=OFF

V15=V3=OFF

SYSR=H

CP#=H→L

SYSR=L→H

CP#=L

V3AUX=ON

V15=V3=ON

SYSR=L

CP#=L ⇔

SYSR=H

CP#=L→H

SYSR=H→L

CP#=L

SYSR=H

CP#=H

SYSR=L

CP#=L→H

SYSR=H→L

CP#=L

SYSR=L→H

CP#=L

V3AUX=ON

V15=V3=OFF

System Status

Stand-by Status

ON Status

From ON to Stand-by Status

From Stand-by to ON Status

:SYSR=L

:SYSR=H

:SYSR=H→L

:SYSR=L→H

Card Status

Card Asserted Status

Card De-asserted Status

From De-asserted to Asserted Status

From Asserted to De-asserted Status

:CP#=L

:CP#=H

:CP#=H→L

:CP#=L→H

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2009.05 - Rev.A

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