參數(shù)資料
型號(hào)： RS5C321B
廠商： RICOH COMPANY LTD
元件分類(lèi)： XO, clock
英文描述： ULTRA-COMPACT SERIAL REAL-TIME CLOCK ICs WITH 32.768kHz
中文描述： 0 TIMER(S), REAL TIME CLOCK, PDSO8
封裝： 0.65 MM PITCH, SSOP-8
文件頁(yè)數(shù)： 25/33頁(yè)
文件大?。?/td> 252K
代理商： RS5C321B
RS5C321A/B
21
Any rise or fall in ambient temperature from its reference value ranging from 20 to 25 degrees Celsius causes
a time delay for a 32.768kHz crystal oscillator. It is recommendable, therefore, to set slightly high oscillation
frequency at room temperature.
9.2 Oscillation Frequency Adjustment
After adjustment, oscillation frequency is subject to fluctuations of an ambient temperature and supply voltage. See
“12. Typical Characteristic Measurements”.
Select crystal oscillator
NO
OK
OK
NO
Fix C
G
(For fixed capacitance)
(For variable capacitance)
Change C
L
value of crystal
Optimize C
G
END
END
Fix the capacitance of C
G
Optimize central
variable capacitance value
Make fine frequency adjustment
with variable capacitance.
Change C
L
value of crystal
*
1
*
3
*
3
*
2
*
1) To ensure that the crystal is matched to the IC, inquire its crystal supplier about its C
L
(load capacitance) and R
1
(equivalent series resistance) values.
It is recommended that the crystal should have the C
L
value range of 6 to 8pF and the typical R
1
value of 30k
.
*
2) To allow for the possible effects of floating capacitance, select the optimum capacitance of the C
G
on the mounted PCB. The standard and recom-
mendable capacitance values of the C
G
range from 5 to 24pF and 8 to 20pF, respectively. When you need to change the frequency to get higher
accuracy, change the C
L
value of the crystal.
*
3) Collate the central variable capacitance value of the C
G
with its oscillation frequency by adjusting the angle of rotation of the variable capacitance of
the C
G
in such a manner that the actual variable capacitance value is slightly smaller than the central variable capacitance value. (It is recommended
that the central variable capacitance value should be slightly less than one half of the actual variable capacitance value because the smaller is vari-
able capacitance, the greater are fluctuations in oscillation frequency.) In the case of an excessive deviation of the oscillation frequency from its
required value, change the C
L
value of the crystal.
Note
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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RS5C338A-E2 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION
RS5C348A 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:4-WIRE SERIAL INTERFACE
RS5C348A-E2 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:Real-Time Clock
RS5C348B 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:4-WIRE SERIAL INTERFACE
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