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參數(shù)資料
| 型號(hào)： | RS5C348B-E2 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | Real-Time Clock |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO10 |
| 封裝： | 6.40 X 3.50 MM, 1.25 MM HEIGHT, 0.5 MM PITCH, SSOP-10 |
| 文件頁數(shù)： | 32/53頁 |
| 文件大小： | 452K |
| 代理商： | RS5C348B-E2 |
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29
R
×
5C348A/B
2.2 Measurement of Oscillation Frequency
Frequency
counter
R
×
5C348A/B
32.768kHz
OSCIN
OSCOUT
VDD
V
SS
32KOUT
*
1) The R
×
5C348A is 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. Conversely, the R
×
5C348B is configured to generate 32-kHz clock pulses for output from the 32KOUT pin regardless of any
internal register settings including the XSTP bit setting 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
frequency of the oscillation circuit.
*
3) The 32KOUT pin 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
×
5C348A/B 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 ±50ppm depending on the degree of their oscillation frequency variations.
*
2) Basically, the R
×
5C348A/B 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.
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相關(guān)代理商/技術(shù)參數(shù) |
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| RS5C372A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C bus SERIAL INTERFACE REAL-TIME CLOCK ICs |
| RS5C372B | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP) |
| RS5C372B-E1 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP) |
| RS5C372B-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP) |
| RS5C373A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock |
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