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參數(shù)資料
| 型號： | RF5C62 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | REAL-TIME CLOCK |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO18 |
| 封裝： | SOP-18 |
| 文件頁數(shù)： | 25/48頁 |
| 文件大小： | 419K |
| 代理商： | RF5C62 |
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21
RP/RF/RS5C62
4.2 Adjustment of Oscillation Frequencies
Select crystal oscillators
Select C
G
and C
D
*
1
*
3
YES
YES
NO
NO
*
3
*
2
*
4
END
Fix C
G
and C
D
< Unless adjustment needs to be made
to oscillation frequencies: >
< If adjustment needs to be made to
oscillation frequencies: >
Replace C
G
with trimmer capacitor
Optimize C
G
and C
D
END
Optimize C
D
Change ranking of oscillation
frequencies
Change ranking of oscillation
frequencies
Fix trimmer capacitor
Make fine adjustment to oscillation
frequencies
*
1) 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
L
) in general and equivalent series resistance (R1).)
*
2) The oscillatory capacitor C
D
can be replaced with a trimmer capacitor to adjust oscillation frequencies.
*
3) Optimize the oscillatory capacitors C
G
and C
D
to adjust oscillation frequencies to desired values (on the actual PCB in consideration of possible influ-
ences by floating capacitance). Note that the greater capacitance of the oscillatory capacitors C
G
and C
D
tend to result in increased current con-
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-
ticular). (See the typical characteristic measurement.)
*
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-
ues of the rotational angle and oscillation frequencies in consideration of the fact that smaller capacitance lead to greater frequency variations).
Oscillation frequencies are subject to variations due to possible fluctuations in ambient temperature and supply
voltage (see“Typical Characteristics”).
Reference
A 32kHz crystal oscillator causes a clock delay above or below the central temperature range of 20C to 25C.
It is therefore recommended to adjust or set oscillation frequencies in such a manner as to become slightly
high in room temperature.
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