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參數(shù)資料
| 型號(hào)： | S-35399A03-J8T2U |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封裝： | HALOGEN FREE AND LEAD FREE, SOP-8 |
| 文件頁數(shù)： | 37/53頁 |
| 文件大?。?/td> | 472K |
| 代理商： | S-35399A03-J8T2U |
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2-WIRE REAL-TIME CLOCK
S-35399A03
Rev.2.0_00
Seiko Instruments Inc.
42
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-35399A03, 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-35399A03.
S-35399A03
XOUT
XIN
Cg
Cd
Rd
Rf
Rf = 100 M
Ω
Rd = 100 k
Ω
Cd = 8 pF
Parasitic capacitance Cpo
Crystal oscillator: 32.768 kHz
Parasitic capacitance Cpi
CL = 6 pF*1
Cg = 0 to 9.1 pF
Cpi, Cpo < 5 pF
Oscillator internal constant
standard values:
*1.
When using a crystal oscillator with a CL value of 7 pF, externally connect Cd if necessary.
Figure 53 Connection Diagram 1
Crystal oscillator
XIN
XOUT
VSS
8
7
6
5
1
2
3
4
S-35399A03
Cg
Locate the GND layer in the layer
immediately below
Figure 54 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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| S354 | 制造商:Johnson Electric / Parlex Corporation 功能描述: 制造商:Johnson Electric / Saia-Burgess 功能描述:Non Catalogue / S354 制造商:SAIA - BURGESS ELECTRONICS INC. 功能描述:Non Catalogue / S354 |
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