參數(shù)資料
型號: S-35390A-J8T1G
元件分類: 時鐘/數(shù)據(jù)恢復(fù)及定時提取
英文描述: 1 TIMER(S), REAL TIME CLOCK, PDSO8
封裝: LEAD FREE, SOP-8
文件頁數(shù): 32/56頁
文件大小: 529K
代理商: S-35390A-J8T1G
2-WIRE REAL-TIME CLOCK
S-35390A
Rev.3.0_00
Seiko Instruments Inc.
38
Adjustment of Oscillation Frequency
1.
Configuration of oscillator
Since crystal oscillation is sensitive to external noise (the clock accuracy is affected), the following measures are
essential for optimizing the oscillation configuration.
(1)
Place the S-35390A, crystal oscillator, and external capacitor (Cg) as close to each other as possible.
(2)
Increase the insulation resistance between pins and the substrate wiring patterns of XIN and XOUT.
(3)
Do not place any signal or power lines close to the oscillator.
(4)
Locating the GND layer immediately below the oscillator is recommended.
(5)
Locate the bypass capacitor adjacent to the power supply pin of the S-35390A.
S-35390A
XOUT
XIN
Rf = 100 M
Ω
Rd = 100 k
Ω
Cd = 8 pF
Cg
Cd
Rd
Rf
Parasitic capacitance*3
Crystal oscillator: 32.768 kHz
Parasitic capacitance*3
CL = 6 pF*1
Cg = None*2 to 9.1 pF
Oscillator internal constant
standard values:
*1. When setting the value for the crystal oscillator’s CL as 7 pF, connect Cd externally if necessary.
*2. Design the board so that the parasitic capacitance is 5 pF.
*3. The oscillator operates unless Cg is not connected. Note that the oscillation frequency is in the direction that it
advances.
Figure 49
Connection Diagram 1
XIN
Crystal
oscillator
XOUT
VSS
Cg
8
7
6
5
1
2
3
4
S-35390A
Locate the GND layer in the
layer immediately below
Figure 50
Connection Diagram 2
Caution
1. When using the crystal oscillator with a CL exceeding the rated value (7 pF) (e.g : CL = 12.5 pF),
oscillation operation may become unstable. Use a crystal oscillator with a CL value of 6 pF or 7 pF.
2. Oscillation characteristics is subject to the variation of each component such as substrate parasitic
capacitance, parasitic resistance, crystal oscillator, and Cg. When configuring an oscillator, pay
sufficient attention for them.
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