參數(shù)資料
型號(hào)： RF5C62
廠商： RICOH COMPANY LTD
元件分類(lèi)： 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(yè)數(shù)： 40/48頁(yè)
文件大?。?/td> 419K
代理商： RF5C62
Category
Questions and Answers
Question 4 : Why should you avoid connecting either end of the oscillatory capacitors C
G
and C
D
to the
VSS pin instead of the VDD pin
Question 5 : Synchroscopic observation of the OSCOUT pin output shows that it has an oscillatory
waveform having a small amplitude or approximating to the VDD pin input. What is the cause of this
phenomenon
RP/RF/RS5C62
36
V
DD
Vp-p:Approx.
1.5 to 2.0V
Approx.
2.0V
V
SS
Internal constant voltage output
Sample Measurements of Variations in Oscillation Characteristics of ICs
V
DD
: 5V at room temperature
C
G
: Approx. 10.5pF, C
D
: Approx. 12.5pF
Total of 54 ICs sampled from 6 lots for measurement
Average variation: 0ppm
Standard deviation: 0.630ppm
Number of samples
5
0
10
–10
–5
0
LOT1
LOT2
LOT3
LOT4
LOT5
LOT6
5
10
15
20
25
30
ppm
Answer 4:Because the oscillatory circuit is driven by a constant voltage of 2V relative to the VDD pin,
either one end of the oscillatory capacitors C
G
and C
D
must be connected to the VDD pin with-
out exception. When either one end of the oscillatory capacitors C
G
and C
D
is connected to the
VSS pin instead of the VDD pin, the oscillatory circuit is still operational but subject directly to
fluctuations in the voltage of the system power supply. Under sharp fluctuations between 5V
and battery voltage in particular, the oscillatory circuit may be brought to a temporary stop.
Thus, it is not recommendable to connect either one end of the oscillatory capacitors C
G
and
C
D
to the VSS pin.
Answer 5:To reduce power consumption, the oscillatory circuit is driven by a constant voltage of about 2V
relative to the VDD pin, so that the OSCOUT pin output has an oscillatory waveform shown in
the figure below. Its amplitude will vary slightly depending on the capacitance of the oscillatory
capacitor C
D
. Note that the oscillatory waveform measurements on the OSCOUT pin cannot be
directly applied to adjustment of oscillation frequencies, which are shifted by use of a probe.
(For how to adjust oscillation frequencies, see “4. Adjustment of Oscillation Frequencies” in
“USAGE”.)
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