參數(shù)資料
型號(hào)： S-35180AT8T1
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： REAL TIME CLOCK, PDSO8
封裝： TSSOP-8
文件頁(yè)數(shù)： 17/46頁(yè)
文件大?。?/td> 498K
代理商： S-35180AT8T1
3-WIRE REAL-TIME CLOCK
S-35180A
Rev.2.0_00
Seiko Instruments Inc.
24
(2) If current oscillation frequency < target frequency (in case the clock is slow)
Register value = Integer value
(Current oscillation frequency)
(Minimum resolution)
(Current oscillation frequency
actual measurement value)
(Target oscillation frequency)
×
+ 1
Caution The figure range which can be corrected is that the calculated value is from 0 to 62.
Example of the calculated value 2
Current oscillation frequency actual measurement value = 0.999920[Hz],
Target oscillation frequency = 1.000000[Hz],
B7 = 0 (minimum resolution = 3.052ppm),
Register value = Integer value
(0.999920)
× (3.052 × 10
6)
(1.000000)
(0.9999220)
+1
= Integer value (26.21)
+1 =26 +1 = 27
Thus, set up (B7,B6,B5,B4,B3,B2,B1,B0) = (0,0,0,1,1,0,1,1) for the clock register.
Example of the calculated value 3
Current oscillation frequency actual measurement value = 0.999920[Hz],
Target oscillation frequency = 1.000000[Hz],
B7 = 1 (minimum resolution = 1.017ppm),
Register value = Integer value
(0.999920)
× (1.017 × 10
6)
(1.000000)
(0.9999220)
+1
= Integer value (78.66)
+ 1
Thus, this calculated value exceeds the correctable range 0 to 62,
B7 = “1” (minimum resolution = 1.017 ppm) indicates the correction is impossible.
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