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參數(shù)資料
| 型號： | RV5C387A |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | I2C-bus Real-Time Clock ICs with Voltage Monitoring Function |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO10 |
| 封裝： | 4 X 2.90 MM, 1.20 MM HEIGHT, SSOP-10 |
| 文件頁數(shù)： | 27/42頁 |
| 文件大小： | 363K |
| 代理商： | RV5C387A |
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PRELIMINARY RV5C387A
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14.2.2.
Measurement of Oscillation Frequency
Frequency
counter
OSCIN
OSCOUT
32KOUT
VSS
32768Hz
* 1) The RV5C387A is configured to generate 32.768-kHz clock pulses for output from the 32KOUT pin.
* 2) A frequency counter with 6 (more preferably 7) or more digits on the order of 1ppm is recommended for
use in the measurement of the oscillation frequency of the oscillation circuit.
* 3) The 32KOUT pin should be connected to the VDD pin as a pull-up resistor.
14.2.3.
Adjustment of Oscillation frequency
The oscillation frequency of the oscillation circuit can be adjusted by varying procedures depending on the
usage of Model RV5C387A in the system into which they are to be built and on the allowable degree of time
count errors. The flow chart below serves as a guide to selecting an optimum oscillation frequency
adjustment procedure for the relevant system.
Start
Course (B)
Use 32-kHz clock output without regard
to its frequency precision
NO
YES
Use 32-kHz
clock output
YES
NO
Course (C)
Course (A)
Course (D)
YES
YES
NO
NO
Allowable time count precision on order of oscillation
frequency variations of crystal oscillator (*1) plus
frequency variations of RTC (*2) (*3)
Allowable time count precision on order of oscillation
frequency variations of crystal oscillator (*1) plus
frequency variations of RTC (*2) (*3)
* 1) Generally, crystal oscillators for commercial use are classified in terms of their center frequency depending
on their load capacitance (CL) and further divided into ranks on the order of
±
10,
±
20, and
±
50ppm
depending on the degree of their oscillation frequency variations.
* 2) Basically, Model RV5C387A is configured to cause frequency variations on the order of
±
5 to
±
10ppm at
normal temperature.
* 3) Time count precision as referred to in the above flow chart is applicable to normal temperature and actually
affected by the temperature characteristics and other properties of crystal oscillators.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| RV5C387A_03 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION |
| RV5C387AE2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC |
| RV5C387A-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C-bus Real-Time Clock ICs with Voltage Monitoring Function |
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