rs5c62 RICOH Co.,Ltd., rs5c62 Datasheet - Page 25

• Manufacturer Part Number: rs5c62
• Description: Real-time Clock
• Manufacturer: RICOH Co.,Ltd.

4.2 Adjustment of Oscillation Frequencies
voltage (see“Typical Characteristics”).
*
*
*
*
Oscillation frequencies are subject to variations due to possible fluctuations in ambient temperature and supply
A 32kHz crystal oscillator causes a clock delay above or below the central temperature range of 20˚C to 25˚C.
It is therefore recommended to adjust or set oscillation frequencies in such a manner as to become slightly
high in room temperature.
1)
2) The oscillatory capacitor C
3) Optimize the oscillatory capacitors C
4) Set the rotational angle of the trimmer capacitor slightly below the central value in its adjustment range (to ensure matching between the central val-
In selecting crystal oscillators, inquire of their suppliers. Check how the selected crystal oscillators match the RP/RF/RS 5C62 and determine the
ranking of oscillation frequencies (load capacitance (C
ences by floating capacitance). Note that the greater capacitance of the oscillatory capacitors C
sumption and prolonged oscillation start time. As a guide, their recommendable capacitance ranges from 5 pF to 20 pF (10 pF to 10-odd pF in par-
ues of the rotational angle and oscillation frequencies in consideration of the fact that smaller capacitance lead to greater frequency variations).
ticular). (See the typical characteristic measurement.)
< Unless adjustment needs to be made
to oscillation frequencies: >
Change ranking of oscillation
frequencies
D
NO
can be replaced with a trimmer capacitor to adjust oscillation frequencies.
G
Optimize C
and C
Fix C
D
to adjust oscillation frequencies to desired values (on the actual PCB in consideration of possible influ-
END
G
and C
G
YES
and C
L
) in general and equivalent series resistance (R1).)
Select crystal oscillators
D
Select C
D
Reference
*
3
G
and C
Replace C
Make fine adjustment to oscillation
Fix trimmer capacitor
D
Optimize C
END
G
frequencies
*
with trimmer capacitor
YES
< If adjustment needs to be made to
oscillation frequencies: >
1
D
G
Change ranking of oscillation
and C
D
NO
*
tend to result in increased current con-
4
frequencies
*
3
RP/RF/RS5C62
*
2
21