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参数资料
| 型号： | RS5C372A-E2 |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封装： | 0.65 MM PITCH, SSOP-8 |
| 文件页数： | 36/59页 |
| 文件大小： | 442K |
| 代理商： | RS5C372A-E2 |
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RS5C372A/B
37
(A) course
Adjustment of clock is not made for IC (no adjustment) and any CL value may be used for the crystal oscillator. Pre-
cision fluctuations of a crystal oscillator may be selected as long as clock precision allows. Obtain the central fre-
quency 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 RS5C372A/B.
(B) course
To keep clock precision within the range of (fluctuation in crys-tal 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
In (C) and (D) courses, adjustment of 32-kHz clock output frequency as well as clock is necessary. Frequency
adjustment for the crystal oscillator is made by adjusting both of CG and CD connected to the both ends of the oscil-
lator. Since the RS5C372A/B incorporate 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 RS5C372A/B, 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 these proce-
dures select a crystal oscillator with optimal CL and set unadjusted value to the clock adjustment circuit. (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.
8
7
6
RS5C372A/B
RF
RD
CD
CG
OSCIN
OSCOUT
32kHz
CGOUT
VDD
VDD
*
1
*1) CGOUT shall be from 0 to 15pF.
(D) course
Select a crystal oscillator as in the (C) course, then adjust clock error for each IC as in (B) course. For clock adjust-
ing procedures, see “2.4 Time Trimming Circuit.”
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RS5C372B | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP) |
| RS5C372B-E1 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP) |
| RS5C372B-E2 | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP) |
| RS5C373A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| RS5C4FC | 制造商:Dialight 功能描述: |
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