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參數(shù)資料
| 型號： | S-35190A-T8T1 |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | REAL TIME CLOCK, PDSO8 |
| 封裝： | TSSOP-8 |
| 文件頁數(shù)： | 27/47頁 |
| 文件大?。?/td> | 527K |
| 代理商： | S-35190A-T8T1 |
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3-WIRE REAL-TIME CLOCK
Rev.1.2_00
S-35190A
Seiko Instruments Inc.
33
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.
NO
YES
START
Variable
capacitance
Select a crystal oscillator
NO
Is Cg in
specification?
*1
*2
Set Cg
NO
Is it optimal
value?
YES
Change Cg
END
YES
Set to center of
variable capacitance
Does frequency
match?
NO
YES
Make fine adjustment
of frequency using
variable capacitance
*3
<Trimmer capacitor>
<Fixed capacitor>
*1. For the matching adjustment of the IC with a crystal, contact the crystal manufacturer to
determine the CL value (load capacitance) and R1 value (equivalent series resistance). CL = 6
pF and R1 = 30 k typ. are recommended values.
*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 38 Crystal Oscillator Setting Flow
Caution 1. The oscillation frequency varies depending on the ambient temperature and power
supply voltage. Refer to the characteristics examples.
2. The 32 kHz crystal oscillator operates more slowly at an operating temperature than
higher or lower 20 to 25
°C. Therefore, it is recommended to adjust or set the oscillator
to operate slightly faster at normal temperature.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| S-35192A-I8T1U | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| S-3530AECA | REAL TIME CLOCK, UUC8 |
| S-3531AECA-TB-01 | REAL TIME CLOCK, UUC8 |
| S-35380A-T8T1G | REAL TIME CLOCK, PDSO8 |
| S-35380A-J8T1G | REAL TIME CLOCK, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-35190A-T8T1G | 功能描述:實(shí)時時鐘 3-Wire 1.3-5.5V RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| S-35192A | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:3-WIRE REAL-TIME CLOCK |
| S-35192A-I8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述:3WIRE REAL TIME CLCK |
| S-35199A01 | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:3-WIRE REAL-TIME CLOCK |
| S-35199A01-HRT1 | 制造商:Seiko Instruments Inc (SII) 功能描述:3WIRE REAL TIME CLCK |
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