Epson RX8130CE, Applications Manual

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15 Battery backup switchover function
RX8130CE
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ETM50E-07
Seiko Epson Corporation
48
15.8 Main power supply (V
DD
) voltage and operation state (INIEN bit = 1)
Figure 37 I
2
C, FOUT operation during voltage drop and rise
V
DD
-V
DET
2
/RST
-V
DET
12
or -V
DET
11
Register setting
Charge enabled: -V
DET
3

V
BAT *1
and V
DD

V
BAT
Charge stop
-V
DET
11
-V
DET
12
2) In case of a voltage rise
I
2
C, FOUT is available I
2
C, FOUT is disabled.
3.3V
A function of
I
2
C
and FOUT stops in sync with the /RST
output
3.3V
+V
DET
11
/RST
Charge stop
+V
DET
12
+V
DET
2
V
DD
Default
I
2
C, FOUT
is available
I
2
C, FOUT is disabled
Charge enable: +V
DET
3

V
BAT *1
and V
DD

V
BAT
+V
DET
11 or +V
DET
12
Register setting
When full charge detection was deactivated (V
DET
3) by register setting, V
BAT
is only charged if V
DD
A function of
I
2
C
and FOUT stops in
sync with the /RST output
1) In case of a voltage drop