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參數(shù)資料
| 型號： | RS5C372B |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | I2C-bus Serial Interface Real Time Clock (8pin SSOP) |
| 中文描述： | REAL TIME CLOCK, PDSO8 |
| 封裝： | SSOP-8 |
| 文件頁數(shù)： | 24/39頁 |
| 文件大?。?/td> | 474K |
| 代理商： | RS5C372B |
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RS5C372B
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2.3. Oscillation Frequency Adjustment
Adjustment method of oscillation frequency may differ dependent on how the RS5C372B is used or how
much clock error is permissible in the system it is installed. Use the flow chart shown below find an
optimal oscillation frequency adjustment method.
Start
(B) course
32kHz clock output is used, but clock
frequency precision is not considered
For clock precision errors derived by adding
deflection in crystal oscillator(*1) + deflection in
IC(*2) is permissible(*3).
NO
YES
32kHz clock
output used
YES
NO
*1) In general crystal oscillators are classified by their central frequency of CL (load capacitance) and
available further grouped in several ranks as ±10, ±20 and ±50ppm of fluctuations in precision.
*2) Fluctuations in frequency due to the IC used is generally from ±5 to 10ppm at a room temperature.
*3) Clock precision here is at a room temperature and is subjected to change due to temperature
characteristics of the crystal itself.
(C) course
(A) course
(D) course
YES
YES
NO
NO
For clock precision errors derived by adding
deflection in crystal oscillator(*1) + deflection in
IC(*2) is permissible(*3).
A) course
Adjustment of clock is not made for IC (no adjustment) and any CL value may be used for the crystal
oscillator. Precision fluctuations of a crystal oscillator may be selected as long as clock precision allows.
Obtain the central frequency as described in section 2.2 using several crystal oscillator and ICs, determine
an adjustment value as described in “2.4. Time Trimming Circuit” which shall be set to the RS5C372B.
B) course
To keep clock precision within the range of (fluctuation in crystal oscillator + fluctuation in IC), clock shall
be adjustment is required for each IC. On adjusting procedures see “2.4 Time Trimming Circuit.”
Available selection range for the frequency precision fluctuations and CL (load capacitance) for a crystal
oscillator may be widened by adjusting clock frequency. Obtain the central frequency as described in
section 2.2. using the crystal oscillator and IC to be used, determine if an adjustment is possible or not
using the clock adjustment circuit, perform adjustment for each IC using the clock adjustment circuit.
Up to ±1.5ppm may be adjusted at a room temperature.
C) course
n (C) and (D) courses, adjustment of 32kHz clock output frequency as well as clock is necessary. Frequency
adjustment for the crystal oscillator is made by adjusting both of CG and OD connected to the both ends of the
oscillator. Since the RS5C372B incorporates the CG and CD, oscillating frequency is required using
CL of the crystal oscillator as the reference.
Generally, relation between CL and CG or CD is as follows:
CL = CG
×
CD + CS
CS: Board floating capacitance
CG + CD
Although a crystal oscillator having CL value of around 6 to 8pF is recommended for the RS5C372B, measure
oscillation frequency as described in section 2.2 and if frequency is high (clock gains) switch to a crystal
oscillator with smaller CL while if frequency is small (clock loses) switch to an oscillator with larger CL. Using
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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| RS5C4F-C | 制造商:DIALIGHT 制造商全稱:Dialight Corporation 功能描述:StreetSense? RS Series LED Roadway Sign Light |
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