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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： | 37/59页 |
| 文件大小： | 442K |
| 代理商： | RS5C372A-E2 |
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RS5C372A/B
38
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 + 0.1)
Oscillation frequency
× 3.051 × 10–6
= (Oscillation frequency – Target frequency)
× 10 + 1
When 32.000kHz crystal oscillator is used, the same formula,
Adjustment amount =
(Oscillation frequency – Target frequency + 0.1)
Oscillation frequency
× 3.125 × 10–6
= (Oscillation frequency – Target frequency)
× 10 + 1
is used.
*1) Oscillation frequency : Clock frequency output from the INTRB (32KOUT for the RS5C372B) pin 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 fre-
quency 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 32.000kHz 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).
2.4-2 When oscillation frequency=target frequency (no clock gain or loss)
Set the adjustment value to 0 or +1, or –64 or –63 to disable adjustment.
2.4-3 When oscillation frequency<target frequency (clock loses)
Adjustment amount =
(Oscillation frequency – Target frequency)
Oscillation frequency
× 3.051 × 10–6
= (Oscillation frequency – Target frequency)
× 10
Also a 32.000kHz crystal is used, the same formula,
Adjustment amount =
(Oscillation frequency – Target frequency)
Oscillation frequency
× 3.051 × 10–6
= (Oscillation frequency – Target frequency)
× 10
is used.
. .
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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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