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參數(shù)資料
| 型號： | S-35390A-J8T1G |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封裝： | LEAD FREE, SOP-8 |
| 文件頁數(shù)： | 19/56頁 |
| 文件大?。?/td> | 529K |
| 代理商： | S-35390A-J8T1G |
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2-WIRE REAL-TIME CLOCK
S-35390A
Rev.3.0_00
Seiko Instruments Inc.
26
1.
How to calculate
(1)
If current oscillation frequency > target frequency (in case the clock is fast)
Correction value
*1 = 128
Integral value
(Current oscillation frequency
actual measurement value
*2)
(Minimum resolution
*4)
(Current oscillation frequency
actual measurement value
*2)
(Target oscillation frequency
*3)
×
Caution
The figure range which can be corrected is that the calculated value is from 0 to 64.
*1. Convert this value to be set in the clock correction register.
For how to convert, refer to “(a) Calculation
example 1”.
*2. Measurement value when 1 Hz clock pulse is output from the
1
INT
pin (or
2
INT
pin).
*3.
Target value of average frequency when the clock correction function is used.
*4.
Refer to Table 13.
(a)
Calculation example 1
In case of current oscillation frequency actual measurement value = 1.000070 [Hz], target oscillation frequency =
1.000000 [Hz], B0 = 0 (Minimum resolution = 3.052 ppm)
Correction value = 128
Integral value
()
1.000070
()
1.000000
()
1.000070
× ()
3.052
× 106
= 128
Integral value (22.93) = 128 22 = 106
Convert the correction value “106” to 7-bit binary and obtain “1101010b”.
Reverse the correction value “1101010b” and set it to B7 to B1 of the clock correction register.
Thus, set the clock correction register:
(B7, B6, B5, B4, B3, B2, B1, B0) = (0, 1, 0, 1, 0, 1, 1, 0)
(2)
If current oscillation frequency < target frequency (in case the clock is slow)
Correction value = Integral value
(Current oscillation frequency
actual measurement value)
(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.
(a)
Calculation example 2
In case of current oscillation frequency actual measurement value = 0.999920 [Hz], target oscillation frequency =
1.000000 [Hz]. B0 = 0 (Minimum resolution = 3.052 ppm)
Correction value = Integral value
()
1.000000
()
0.999920
()
0.999920
()
3.052
10-6
+ 1
= Integral value (26.21)
+ 1 = 26 + 1 = 27
Thus, set the clock correction register:
(B7, B6, B5, B4, B3, B2, B1, B0) = (1, 1, 0, 1, 1, 0, 0, 0)
(b)
Calculation example 3
In case of current oscillation frequency actual measurement value = 0.999920 [Hz], target oscillation frequency =
1.000000 [Hz], B0 = 1 (Minimum resolution = 1.017 ppm)
Correction value = Integral value
()
1.000000
()
0.999920
()
0.999920
× ()
1.017
× 10-6
+ 1
= Integral value (78.66)
+ 1
This calculated value exceeds the correctable range 0 to 62.
B0 = “1” (minimum resolution = 1.017 ppm) indicates the correction is impossible.
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