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參數(shù)資料
| 型號： | RV5C338A-E2 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | DIODE ZENER SINGLE 200mW 8.2Vz 20mA-Izt 0.02549 0.1uA-Ir 6.5 SOD-323 3K/REEL |
| 中文描述： | REAL TIME CLOCK, PDSO10 |
| 封裝： | 4 X 2.90 MM, 1.20 MM HEIGHT, SSOP-10 |
| 文件頁數(shù)： | 31/52頁 |
| 文件大小： | 440K |
| 代理商： | RV5C338A-E2 |
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R
×
5C338A
28
2.2 Measurement of Oscillation Frequency
*
1) The R
×
5C338A are configured to generate 32.768-kHz clock pulses for output from the 32KOUT pin at power-on conditionally on setting the XSTP bit
to 1 in the control register 2.
*
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 fre-
quency of the oscillation circuit.
*
3) The CLKC input should be connected to the V
DD
pin with a pull-up resistor.
2.3 Adjustment of Oscillation Frequency
The oscillation frequency of the oscillation circuit can be adjusted by varying procedures depending on the usage of
the R
×
5C338A 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
Use 32-kHz
clock circuit
NO
NO
NO
YES
YES
YES
YES
NO
Use 32-kHz clock circuit without regard
to its frequency precision
Allowable time count precision is on order of oscillation
frequency variations of crystal oscillator *
1
plus
frequency variations of real-time clock
*
2,
*
3
Allowable time count precision is on order of oscillation
frequency variations of crystal oscillator
*
1
plus
frequency variations of real-time clock
*
2,
*
3
To Course (A)
To Course (B)
To Course (C)
To Course (D)
*
1) Generally, crystal oscillators for commercial use are classified in terms of their center frequency depending on their load capacitance (C
L
) and further
divided into ranks on the order of ±10, ± 20, and ±50 ppm depending on the degree of their oscillation frequency variations.
*
2) Basically, the R
×
5C338A are 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.
Frequency
counter
R
×
5C338A
32.768kHz
OSCIN
OSCOUT
CLKC
VDD
V
SS
32KOUT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RV5C339 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION |
| RV5C339A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION |
| RV5C339A_03 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3-WIRE SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION |
| RV5C339A-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION |
| RV5C348A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:4-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION |
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