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R2025S 参数 Datasheet PDF下载

R2025S图片预览
型号: R2025S
PDF下载: 下载PDF文件 查看货源
内容描述: 高精度I2C总线实时时钟模块 [High precision I2C-Bus Real-Time Clock Module]
分类和应用: 时钟
文件页数/大小: 47 页 / 563 K
品牌: RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
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R2025S/D  
the Second Counter is incremented once per 32768 32.768-kHz clock pulses generated by the crystal  
oscillator. Writing to the F6 to F0 bits activates the oscillation adjustment circuit.  
* The Oscillation Adjustment Circuit will not operate with the same timing (00, 20, or 40 seconds)  
as the timing of writing to the Oscillation Adjustment Register.  
* The F6 bit setting of 0 causes an increment of time counts by ((F5, F4, F3, F2, F1, F0) - 1) x 2.  
The F6 bit setting of 1 causes a decrement of time counts by ((/F5, /F4, /F3, /F2, /F1, /F0) + 1) x 2.  
The settings of "*, 0, 0, 0, 0, 0, *" ("*" representing either "0" or "1") in the F6, F5, F4, F3, F2, F1, and F0 bits  
cause neither an increment nor decrement of time counts.  
Example:  
When the second digits read 00, 20, or 40, the settings of "0, 0, 0, 0, 1, 1, 1" in the F6, F5, F4, F3, F2, F1, and  
F0 bits cause an increment of the current time counts of 32768 by (7 - 1) x 2 to 32780 (a current time count  
loss). When the second digits read 00, 20, or 40, the settings of "0, 0, 0, 0, 0, 0, 1" in the F6, F5, F4, F3, F2,  
F1, and F0 bits cause neither an increment nor a decrement of the current time counts of 32768.  
When the second digits read 00, 20, or 40, the settings of "1, 1, 1, 1, 1, 1, 0" in the F6, F5, F4, F3, F2, F1, and  
F0 bits cause a decrement of the current time counts of 32768 by (- 2) x 2 to 32764 (a current time count  
gain).  
An increase of two clock pulses once per 20 seconds causes a time count loss of approximately 3 ppm (2 /  
(32768 x 20 = 3.051 ppm). Conversely, a decrease of two clock pulses once per 20 seconds causes a time  
count gain of 3 ppm. Consequently, deviations in time counts can be corrected with a precision of ±1.5 ppm.  
Note that the oscillation adjustment circuit is configured to correct deviations in time counts and not the  
oscillation frequency of the 32.768-kHz clock pulses. For further details, see "P28 Configuration of  
Oscillation Circuit and Correction of Time Count Deviations Oscillation Adjustment Circuit".  
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