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| 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： | 35/59页 |
| 文件大小： | 442K |
| 代理商： | RS5C372A-E2 |
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RS5C372A/B
36
2.2 Measurement of Oscillation Frequency
Frequency
counter
RS5C372A/B
32.768kHz
or
32.000kHz
OSCIN
OSCOUT
VDD
V
SS
INTRB (32KOUT)
*
4
*
4
*
3
*1) Clock pulse of 32.768kHz or 32.000kHz is output from the
INTRB output pin on powering on (XSTP is set to 1).
*2) Use a frequency counter having at least 6 digits (7digits or
more recommended).
*3) Pull-up the INTRB output pin to VDD for the RS5C372A.
*4) INTRB applies to the RS5C372A, and 32KOUT applies to the
RS5C372B. The RS5C372B does not need pull-up resistor.
2.3 Oscillation Frequency Adjustment
Adjustment amount of oscillation frequency may differ dependent on how the RS5C372A/B 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
32kHz
clock used?
NO
YES
NO
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.
For clock precision errors derived by adding deflection
in crystal oscillator*1 + deflection in IC*2 is permissible*3.
(A) course
(B) course
(C) course
(D) course
*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.
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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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