參數(shù)資料
型號(hào)： R2023T
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(yè)數(shù)： 30/50頁(yè)
文件大小： 512K
代理商： R2023T
R2023K/T
Measurement of Oscillation Frequency
30
Frequency
Counter
OSCIN
OSCOUT
32KOUT
VSS
32768Hz
VDD
CLKC
* 1) The R2023K/T 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.
Adjustment of Oscillation frequency
The oscillation frequency of the oscillation circuit can be adjusted by varying procedures depending on the usage
of Model R2023K/T 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, quartz crystal units 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 R2023K/T 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 quartz crystal units.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
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R2-0259-02 制造商:Southco 功能描述:
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R2025S 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:High precision I2C-Bus Real-Time Clock Module
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