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參數(shù)資料
| 型號： | 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)： | 39/53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.
44
3. Adjustment of oscillation frequency
(1) Adjustment by setting Cg
Matching of the crystal oscillator with the nominal frequency must be performed with the stray capacitance on the
board included. Select a crystal oscillator and optimize the Cg value in accordance with the flowchart below.
START
END
YES
NO
YES
NO
YES
NO
YES
Set to center
of variable
capacitance*3
Select a crystal
oscillator*1
Variable
capacitance
Change Cg
Optimal
value*2
Frequency
Cg in
specification
Set Cg
Make fine adjustment
of frequency using
variable capacitance
Trimmer capacitor
Fixed capacitor
*1.
Request a crystal manufacturer for matching evaluation between the IC and a crystal. The recommended
crystal characteristic values are, CL value (load capacitance) = 6 pF, R1 value (equivalent serial resistance) = 50
k
Ω max.
*2.
The Cg value must be selected on the actual PCB since it is affected by stray capacitance. Select the external Cg
value in a range of 0 pF to 9.1 pF.
*3.
Adjust the rotation angle of the variable capacitance so that the capacitance value is slightly smaller than the
center, and confirm the oscillation frequency and the center value of the variable capacitance. This is done in
order to make the capacitance of the center value smaller than one half of the actual capacitance value because a
smaller capacitance value increases the frequency variation.
Figure 56 Crystal Oscillator Setting Flow
Caution 1. The oscillation frequency varies depending on the ambient temperature and power supply
voltage. Refer to “ Characteristics (Typical Data)”.
2. The 32.768 kHz crystal oscillator operates more slowly at an operating temperature than higher
or lower 20 to 25
°C. Therefore, it is recommended to set the oscillator to operate slightly faster
at normal temperature.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| S3540 | 制造商:Microsemi Corporation 功能描述:STD RECOVERY RECTFR 400V 70A 2PIN DO-203AB - Bulk 制造商:MERKLE-KORFF INDUSTRIES 功能描述:OLD COLMAN P/N: 8004002 |
| S354-006 | 功能描述:CABLE SCSI II C50M/M 6' RoHS:是 類別:電纜組件 >> D形，Centronics 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 配置:VHDCI 68 位置公型至公型 長度:10.00'（3.05m） 纜線類型:圓形 - 黑色 屏蔽:屏蔽 樣式:SCSI Ultra 2 |
| S3-5409-LAB (W/O COVER) | 制造商:Molex 功能描述:CONNECTOR - Bulk |
| S3540PF | 制造商:Microsemi Corporation 功能描述:400V 35A 2PIN DO-21 - Bulk |
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