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參數(shù)資料
| 型號： | R2023K |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | 2-wire Serial Interface Real Time Clock IC |
| 中文描述： | 2線串行接口實(shí)時(shí)時(shí)鐘芯片 |
| 文件頁數(shù)： | 29/50頁 |
| 文件大小： | 512K |
| 代理商： | R2023K |
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R2023K/T
Configuration of Oscillation Circuit and Correction of Time Count
Deviations
Configuration of Oscillation Circuit
29
32kHz
CG
CD
A
OSCIN
OSCOUT
Oscillator
Circuit
The oscillation circuit is driven at a constant voltage of approximately 1.2 volts relative to the level of the VSS pin
input. As such, it is configured to generate an oscillating waveform with a peak-to-peak voltage on the order of
1.1 volts on the positive side of the VSS pin input.
< Considerations in Handling quartz crystal unit >
Generally, quartz crystal units have basic characteristics including an equivalent series resistance (R1) indicating
the ease of their oscillation and a load capacitance (CL) indicating the degree of their center frequency.
Particularly, quartz crystal units intended for use in the R2023K/T are recommended to have a typical R1 value of
50k
and a typical CL value of 6 to 9pF. To confirm these recommended values, contact the manufacturers of
quartz crystal units intended for use in these particular models.
< Considerations in Installing Components around the Oscillation Circuit >
1) Install the quartz crystal unit in the closest possible vicinity to the real-time clock ICs.
2) Avoid laying any signal lines or power lines in the vicinity of the oscillation circuit (particularly in the area
marked "A" in the above figure).
3) Apply the highest possible insulation resistance between the OSCIN and OSCOUT pins and the printed
circuit board.
4) Avoid using any long parallel lines to wire the OSCIN and OSCOUT pins.
5) Take extreme care not to cause condensation, which leads to various problems such as oscillation halt.
< Other Relevant Considerations >
1) We cannot recommend connecting the external input of 32.768-kHz clock pulses to the OSCIN pin.
2) To maintain stable characteristics of the quartz crystal unit, avoid driving any other IC through 32.768-kHz clock
pulses output from the OSCOUT pin.
Typical externally-equipped element
X’tal : 32.768kHz
Standard values of internal elements
CG,CD 10pF typ
(R1=50k
typ)
(CL=6pF to 9pF)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R2023K-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2-wire Serial Interface Real Time Clock IC |
| R2023T | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2-wire Serial Interface Real Time Clock IC |
| R2023T-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2-wire Serial Interface Real Time Clock IC |
| R2-0257-02 | 制造商:Southco 功能描述: |
| R2-0259-02 | 制造商:Southco 功能描述: |
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