Epson S5U1C17801T1100 - Manual (Page 29)

8 JUMPER SWITCH SETTINGS
S5U1C17801T1100 HARDWARE MANUAL EPSON 23
(SOFTWARE EVALUATION TOOL FOR S1C17801)
Setting for JP2
JP2 can be used to select the power supply source for RTCV
DD
as shown in the following. Short 2-3 on JP2 to se-
lect V
DD
for the power supply to RTCV
DD
, whereas 1-3 to select battery. For details, see the description of RTC
control circuit in Chapter 10. Note that, when 1-2 is shorted, a coin cell battery is required to activate RTCV
DD
.
Factory default setting for JP2 is 1-2 shorted.
JP2
JP2
C55
0.1µF
C47
10µF
JP2
DIC-149-3P
1
2
1
2
3
To RTCV
DD
V
DD
D10
CRS06
BAT1
106
V
DD
Battery
+
–
Fig. 8.2.1 JP2 Related Circuit