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
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
8/15
2009.05 - Rev.A