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(4) Power supply switching operation 1 (OFF-OFF switching)
Fig.8.4.3 shows an example of power supply switching operation 1 on connection / disconnection of power
supply with a higher priority level.
State C
Description of each state
State A: Input power not selected.
(OB1:OFF, OB2:OFF, OU1:OFF, OU2:OFF, OC1:OFF, OC2:OFF)
State B: V
input power supply selected, backflow from V
BAT
(OB1:ON, OB2:OFF, OU1:OFF, OU2:OFF, OC1:OFF, OC2:OFF)
State C: V
input power supply selected, full on state
BAT
(OB1:ON, OB2:ON, OU1:OFF, OU2:OFF, OC1:OFF, OC2:OFF)
State D: V
input power supply selected, backflow from V
CC
(OB1:OFF, OB2:OFF, OU1:OFF, OU2:OFF, OC1:ON, OC2:OFF)
State E: V
input power supply selected, full on state
CC
(OB1:OFF, OB2:OFF, OU1:OFF, OU2:OFF, OC1:ON, OC2:ON)
Description of transition conditions
: V
& V
input enabled
CC
BAT
: V
& V
input enabled, elimination of backflow potential between input power supply (V
CC
BAT
(Typ. 19mV)
: V
& V
input enabled, backflow potential between input power supply (V
CC
BAT
: V
input disabled, V
CC
: V
input disabled, V
CC
(V
) and V
(Typ. 19 mV)
BAT
OUT
: V
input disabled, V
CC
Fig.8.4.3 V
S1F76980 Technical Manual (Rev.1.0)
State B
input enabled
BAT
input enabled, elimination of backflow potential between input power supply
BAT
input enabled, backflow potential between input power supply (V
BAT
⇔ V
power supply switching state transition 1
BAT
CC
8. FUNCTIONAL DESCRIPTION
State A
prevented
OUT
prevented
OUT
EPSON
State D
) and V
CC
OUT
BAT
State E
) and V
CC
OUT
) and V
OUT
11
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