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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： | 20/59页 |
| 文件大小： | 442K |
| 代理商： | RS5C372A-E2 |
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RS5C372A/B
23
2.5-3 Year digit register (at internal address 6h)
D7
D6
D5
D4
D3
D2
D1
D0
Y80
Y40
Y20
Y10
Y8
Y4
Y2
Y1
Y80
Y40
Y20
Y10
Y8
Y4
Y2
Y1
Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined
(For write operation)
(For read operation)
Default*
2.6 Time Trimming Register (at internal address 7h)
D7
D6
D5
D4
D3
D2
D1
D0
XSL
F6
F5
F4
F3
F2
F1
F0
XSL
F6
F5
F4
F3
F2
F1
F0
0
(For write operation)
(For read operation)
Default*
*) The default means read value when XSTP bit is set to “1” by starting up from 0V, or supply voltage drop, etc.
2.6-1 XSL bit
The XSL bit is used to select a crystal oscillator.
Set the XSL to “0” (default) to use 32.768kHz.
Set the XSL to “1” to use 32.000kHz.
2.6-2 F6 to F0
The time trimming circuit adjust one second count based on this register readings when second digit is 00, 20, or 40
seconds. Normally, counting up to seconds is made once per 32,768 of clock pulse (or 32,000 when 32.000kHz crys-
tal is used) generated by the oscillator. Setting data to this register activates the time trimming circuit.
Register counts will be incremented as ((F5, F4, F3, F2, F1, F0)–1)
×2 when F6 is set to “0”.
Register counts will be decremented as ((F5, F4, F3, F2, F1, F0)+1)
×2 when F6 is set to “1”.
Counts will not change when (F6, F5, F4, F3, F2, F1, F0) are set to (*, 0, 0, 0, 0, 0,*).
For example, when 32.768kHz crystal is used.
When (F6, F5, F4, F3, F2, F1, F0) are set to (0, 0, 0, 0, 1, 1, 1), counts will change as: 32,768+(7–1)
×2=32,780
(clock will be delayed) when second digit is 00, 20, or 40.
When (F6, F5, F4, F3, F2, F1, F0) are set to (0, 0, 0, 0, 0, 0, 1), counts will remain 32,768 without changing when
second digit is 00, 20, or 40.
When (F6, F5, F4, F3, F2, F1, F0) are set to (1, 1, 1, 1, 1, 1, 0), counts will change as: 32,768+(–2)
×2=32,764
(clock will be advanced) when second digit is 00, 20, or 40.
Adding 2 clock pulses every 20 seconds: 2/(32,768
×20)=3.051ppm (or 3.125ppm when 32.000kHz crystal is used),
delays the clock by approx. 3ppm. Likewise, decrementing 2 clock pulses advances the clock by 3ppm. Thus the
clock may be adjusted to the precision of ±1.5ppm. Note that the time trimming function only adjust clock timing
and oscillation frequency and 32-kHz clock output is not adjusted.
*) The default means read value when XSTP bit is set to “1” by starting up from 0V, or supply voltage drop, etc.
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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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