參數(shù)資料
型號(hào)： S-3531AECA-TB-01
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： REAL TIME CLOCK, UUC8
封裝： DIE-8
文件頁(yè)數(shù)： 15/29頁(yè)
文件大小： 236K
代理商： S-3531AECA-TB-01
REAL-TIME CLOCK
S-3531A
Seiko Instruments Inc.
21
3.
Adjustment of oscillating frequencies
Matching of a crystal oscillator with the nominal frequency must be performed with parasitic
capacitance on the board included. Select a crystal oscillator and optimize the Cg value in accordance
with the flow chart below.
NO
YES
START
Variable
capacity
Select a crystal oscillator.
NO
Is Cg in the
specification ?
(*1)
(*2)
Cg set
NO
Is it an
optimal
value ?
YES
Change Cg.
END
YES
Set to the center of
variable capacitor.
Does
the frequency
match ?
NO
YES
Make fine adjustment
of the frequency in
variable capacity.
(*3)
<Trimer capacitor>
<Fixed capacitor>
(*1) For making matching adjustment of the IC with a crystal, contact an appropriate crystal maker to
determine the CL value (load capacity) and RI value (equivalent serial resistance). The CL value
= 6 pf and RI value = 30 k
TYP. are recommended values.
(*2) Cg value selection must be performed on the actual PCB since parasitic capacitance affects it.
Select the Cg value in a range from 3 pf to 35 pf. If the frequency does not match, change the CL
value of the crystal.
(*3) Adjust the rotation angle of the variable capacity so that the capacity value is somewhat smaller
than the center, and confirm the oscillating frequency and the center value of the variable
capacity. This is done in order to make the capacity of the center value smaller than one half of
the actual capacity value because a smaller capacity value makes a greater quantity of changes in
a frequency. If the frequency does not match, change the CL value of the crystal.
Note 1 : Oscillating frequencies are changed by ambient temperature and power voltage. Refer to
property samples.
Note 2 : The 32 kHz crystal oscillator operates slower at higher or lower ambient temperature than 20
to 25
°C. Therefore, it is recommended to adjust or set the oscillator to operate somewhat
faster at normal temperature.
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