RoyalTek RDR-3100 - Manual (Page 8)

RDR-3100 User Manual
Figure 2.
Backup Battery Circuit
V_3V3
Battery SCH
PIN3(RTC_3V3)
B1
1
2
R40 220
2 1
D12
RB705D
TP37
1
1
3
2 1
D13
RB705D
3
8