參數(shù)資料
型號(hào)： R2051K01
廠商： RICOH COMPANY LTD
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 0 TIMER(S), REAL TIME CLOCK, QCC12
封裝： 2 X 2 MM, 0.85 MM PITCH, ULTRA-COMPACT, FFP, 12 PIN
文件頁(yè)數(shù)： 25/53頁(yè)
文件大小： 343K
代理商： R2051K01
R2051 Series
12345
Rev.1.04
- 31 -
l
Measurement of Oscillation Frequency
Frequency
Counter
32768Hz
VCC
OSCIN
OSCOUT
VDD
CLKOUT
VSS
* 1)
The R2051 is configured to generate 32.768-kHz clock pulses for output from the CLKOUT 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.
l
Adjustment of Oscillation frequency
The oscillation frequency of the oscillation circuit can be adjusted by varying procedures depending on the usage of
Model R2051 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
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 R2051 is configured to cause frequency variations on the order of
±5 to ±10ppm at
25
°C.
* 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)
參數(shù)描述
R2051K01-E2 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function
R2051K02-E2 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function
R2051S01-E2 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function
R2051S02-E2 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function
R2051S03-E2 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function
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