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參數(shù)資料
| 型號： | S-35192A-I8T1U |
| 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： | HALOGEN FREE AND LEAD FREE, SNT-8 |
| 文件頁數(shù)： | 25/41頁 |
| 文件大?。?/td> | 366K |
| 代理商： | S-35192A-I8T1U |
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3-WIRE REAL-TIME CLOCK
Rev.2.0_00
S-35192A
Seiko Instruments Inc.
31
Adjustment of Oscillation Frequency
1.
Configuration of oscillation
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-35192A, 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-35192A.
S-35192A
XOUT
XIN
Cg
Cd
Rd
Rf
Rf = 100 M
Ω
Rd = 100 k
Ω
Cd = 8 pF
Crystal oscillator: 32.768 kHz
Parasitic capacitance
*3
CL = 6 pF*1
Cg = None
*2 to 9.1 pF
Oscillation internal constant
standard values:
Parasitic
capacitance
*3
*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
advances.
Figure 35
Connection Diagram 1
XIN
Crystal oscillator
XOUT
VSS
Cg
8
7
6
5
1
2
3
4
S-35192A
Locate the GND layer in the
layer immediately below
Figure 36
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 are subject to the variation of each component such as substrate
parasitic capacitance, parasitic resistance, crystal oscillator, and Cg. When configuring oscillator,
pay sufficient attention for them.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-35199A01 | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:3-WIRE REAL-TIME CLOCK |
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| S3-5-1AE | 制造商:OENINDIA 制造商全稱:OEN India Limited 功能描述:MINI AUTOMOTIVE RELAY |
| S3-5-1ANIL | 制造商:OENINDIA 制造商全稱:OEN India Limited 功能描述:MINI AUTOMOTIVE RELAY |
| S3-5-1CE | 制造商:OENINDIA 制造商全稱:OEN India Limited 功能描述:MINI AUTOMOTIVE RELAY |
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