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參數(shù)資料
| 型號： | RS5C372B-E2 |
| 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： | 0.65 MM PITCH, SSOP-8 |
| 文件頁數(shù)： | 25/39頁 |
| 文件大小： | 474K |
| 代理商： | RS5C372B-E2 |
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RS5C372B
- 25 -
these procedures select a crystal oscillator with optimal CL and set unadjusted value to the time trimming
register. (See section 2.4, “Time Trimming Circuit”.) We recommend to consult the crystal manufacturer on
compatibility of CL values.
High oscillation frequency (clock gains) may be adjusted by externally adding CGout as shown below.
VDD
VDD
OSCIN
OSCOUT
32kHz
RD
RF
CGout
*1)
CD
CG
(D) course
Select a crystal oscillator as in the (C) course, then adjust clock error for each IC as in (B) course. For
clock adjusting procedures, see “2.4. Time Trimming Circuit.”
2.4. Time Trimming Circuit
Using the Time Trimming Circuit gain or lose of clock may be adjusted with high precision by changing clock
pulses for one second every 20 seconds. When adjustment with this circuit is not necessary, set (F6, F5, F4,
F3, F2, F1, F0) to (*, 0, 0, 0, 0, 0, *) to disable adjustment. (* mark indicates 0 or 1.)
Adjustment amount may be calculated using the following formula.
2.4.1. When oscillation frequency (*1)>target frequency(*2) (clock gains)
Adjustment amount(*3) = (Oscillation frequency-Target frequency(*2) + 0.1)
Oscillation frequency
×
3.051
×
10
-6
When 32.000kHz crystal oscillator is used, the same formula is used.
Adjustment amount = (Oscillation frequency-Target frequency + 0.1)
Oscillation frequency
×
3.125
×
10
-6
≈
(Oscillation frequency-Target frequency)
×
10 + 1
*1) Oscillation frequency: Clock frequency output from the 32KOUT as in “2.2 Oscillation Frequency
Measurement” at a room temperature.
*2) Target frequency: A frequency to be adjusted to. Since temperature characteristics of a 32.768kHz
crystal oscillator are such that it will generally generates the highest frequency
at a room temperature, we recommend to set the target frequency to approx.
32768.00Hz to 32768.10Hz (+3.05ppm to 32768Hz).
We also recommend setting of approx. 32000.00Hz to 32000.10Hz (3.125ppm
to 32000Hz) also for the 32000kHz crystal. Note that this value may differ based
on the environment or place where the device will be used.
*3) Adjustment amount: A value to be set finally to F6 to F0 bits. This value is expressed in 7bit binary
digits with sign bit (two’s compliment).
≈
(Oscillation frequency-Target frequency)
×
10 + 1
*1) CGout = 0 to 15pF
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