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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)： | 38/48頁 |
| 文件大?。?/td> | 419K |
| 代理商： | RF5C62 |
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Question 1:What are the causes of failure in adjustment of oscillation frequencies (Subject to use of
variable capacitors and adjustment of oscillation frequencies)
Question 2 :What are the causes of inaccurate time count operation (Subject to use of fixed capaci-
tors and no adjustment of oscillation frequencies)
RP/RF/RS5C62
34
QUESTIONS AND ANSWERS ON USE
Below are listed questions and answers on using the RP/RF/RS5C62 under the following four categories:
1) Crystal oscillators
2) Hardware
3) Software
4) AC/DC electrical characteristics and others
Answer 1: For capacitance variations of about 5 to 30pF, oscillation frequency variations measure a little
more than about 60ppm in real terms (see the graphs in 10.5 and 10.6 of “10. Typical
Characteristics”). The possible causes of failure in adjustment of oscillation frequencies are:
1. Variations in the crystals, the capacitors, and the ICs outside the range of adjustment of
capacitance variations, and
2. Mismatching between the central value of variations in these elements and that of the range
of variations of variable capacitors.
The possible corrective measures for the causes 1. and 2. above are :
1. Reviewing variations in the individual elements. (For reference, measurements of variations
in the ICs are shown in Answer 3 below.), and
2. Adjusting oscillation frequencies according to the directions described in “4. Adjustment of
Oscillation Frequencies” in “USAGE”.
Answer 2: The possible causes of inaccurate time count operation are :
1. Mismatching between the capacitance of the oscillatory capacitors C
G
and C
D
and that of the
crystals and the ICs, and
2. Too great floating capacitance present on the actual PCB to be neglected for the oscillatory
capacitors C
G
and C
D
, which are adapted to the ICs and the ranking of oscillation frequencies
(load capacitance (C
L
)).
The possible corrective measures for the causes 1. and 2. above are :
1. Adjusting oscillation frequencies according to the directions described in “4. Adjustment of
Oscillation Frequencies” in “USAGE”, and
2. Reduce the capacitance of the oscillatory capacitors C
G
and C
D
by the equivalent of floating
capacitance, which seems to vary from 1 to several pF depending on the layout of the PCB, or
mount them on the actual PCB for final fixing.
Category
Questions and Answers
1) Crystal
oscillators
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