參數(shù)資料
型號(hào)： R2023K
廠商： Ricoh Co., Ltd.
英文描述： 2-wire Serial Interface Real Time Clock IC
中文描述： 2線串行接口實(shí)時(shí)時(shí)鐘芯片
文件頁(yè)數(shù)： 34/50頁(yè)
文件大?。?/td> 512K
代理商： R2023K
R2023K/T
Oscillation adjustment value calculations are exemplified below
(A) For an oscillation frequency = 32768.85Hz and a target frequency = 32768.05Hz
When setting DEV bit to 0:
Oscillation adjustment value = (32768.85 - 32768.05 + 0.1) / (32768.85
×
3.051
×
10
-6
)
≈
(32768.85 - 32768.05)
×
10 + 1
= 9.001
≈
9
In this instance, write the settings (DEV,F6,F5,F4,F3,F2,F1,F0)=(0,0,0,0,1,0,0,1) in the oscillation adjustment
register. Thus, an appropriate oscillation adjustment value in the presence of any time count gain represents a
distance from 01h.
When setting DEV bit to 1:
Oscillation adjustment value = (32768.85 - 32768.05 + 0.0333) / (32768.85
×
1.017
×
10
-6
)
≈
(32768.85 - 32768.05)
×
30 + 1
= 25.00
≈
25
In this instance, write the settings (DEV,F6,F5,F4,F3,F2,F1,F0)=(1,0,0,1,1,0,0,1) in the oscillation adjustment
register.
(B) For an oscillation frequency = 32762.22Hz and a target frequency = 32768.05Hz
When setting DEV bit to 0:
Oscillation adjustment value = (32762.22 - 32768.05) / (32762.22
×
3.051
×
10
-6
)
≈
(32762.22 - 32768.05)
×
10
= -58.325
≈
-58
To represent an oscillation adjustment value of - 58 in 7-bit coded decimal notation, subtract 58 (3Ah) from 128
(80h) to obtain 46h. In this instance, write the settings of (DEV,F6,F5,F4,F3,F2,F1,F0) = (0,1,0,0,0,1,1,0) in the
oscillation adjustment register. Thus, an appropriate oscillation adjustment value in the presence of any time
count loss represents a distance from 80h.
When setting DEV bit to 1:
Oscillation adjustment value = (32762.22 - 32768.05) / (32762.22
×
1.017
×
10
-6
)
≈
(32762.22 - 32768.05)
×
30
= -174.97
≈
-175
Oscillation adjustment value can be set from -62 to 63. Then, in this case, Oscillation adjustment value is out of
range.
(4) Difference between DEV=0 and DEV=1
Difference between DEV=0 and DEV=1 is following,
DEV=0
Maximum value range
-189.2ppm to 189.2ppm
Minimum resolution
3ppm
Notes:
1) Oscillation adjustment circuit does not affect the frequency of 32.768-kHz clock pulses output from the
32KOUT pin.
2) If following 3 conditions are completed, actual clock adjustment value could be different from target
adjustment value that set by oscillator adjustment function.
1. Using oscillator adjustment function
34
DEV=1
--62ppm to 63ppm
1ppm
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
R2023K-E2 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:2-wire Serial Interface Real Time Clock IC
R2023T 制造商:RICOH 制造商全稱(chēng):RICOH electronics devices division 功能描述:2-wire Serial Interface Real Time Clock IC
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