R2023K Datasheet, PDF (43/50 Pages) RICOH electronics devices division – 2-wire Serial Interface Real Time Clock IC

R2023K/T
Typical Applications
• Typical Power Circuit Configurations
Sample circuit configuration 1
R1163xxx1B is a series regulator with the reverse current protection circuit. The CE pin should be pull-up to
system power supply voltage, and ECO pin should be connect to system power supply or VSS. Please select
VOUT voltage equal to the CPU power supply voltage that interfaces to R2023K/T and SRAM.
System Power Supply
*1) Install bypass capacitors for
high-frequency and low-frequency
applications in parallel in close
VDD
VOUT
VDD
vicinity to the R2023K/T.
R1163xxx1B
SRAM
etc.
CE
ECO
VSS
Primary
Battery
VSS
Sample circuit configuration 2
OSCIN
OSCOUT
VDD
32768Hz
System power supply
VSS
Primary
Battery
OSCIN
OSCOUT
VDD
32768Hz
System power supply
Secondary
Battery
VSS
43