R2023T-E2-F Datasheet, PDF (35/56 Pages) RICOH electronics devices division – 2-wire Serial Interface Real Time Clock IC

* R2023K (FFP12) is the discontinued product as of February, 2016.
R2023x
Reference
Incidentally, the high oscillation frequency of the crystal oscillator can also be adjusted by adding an external
oscillation stabilization capacitor CGOUT or/and CDOUT as illustrated in the diagram below.
Oscillator CG
Circuit _RD
CD
OSCIN
32kHz
OSCOUT
CDOUT
*1) The CGOUT or/and CDOUT should have a
capacitance ranging from 0 to 6 pF.
CGOUT
However, if adding CGOUT and/or CDOUT, Time keeping Voltage and Current will be worse, and it will be
hard to oscillate. For reference, the data of Time keeping voltage and current when adding CGOUT = CDOUT
= 5 pF are shown in the table below.
Symbol
Vclk
Item
Time Keeping
Voltage
IDD
Time Keeping
Current
Condition
CGout = CDout = 5 pF
VDD = 3 V,
SCL, SDA, CLKC = 0 V
32KOUT = OPEN
OUTPUT = OPEN
CGout = CDout = 5 pF
(Topt = -40 ~ 85°C, VSS = 0 V)
Min. Typ. Max. Unit.
1.15
5.5
V
0.55 1.20
µA
Course (D)
It is necessary to select the crystal oscillator in the same manner as in Course (C) as well as correct errors in
the time count of each RTC in the same manner as in Course (B) by the method described in " P.36 •
Oscillation Adjustment Circuit ".
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