參數(shù)資料
型號(hào)： S-35399A03-J8T2G
元件分類(lèi)： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO8
封裝： LEAD FREE, SOP-8
文件頁(yè)數(shù)： 24/53頁(yè)
文件大小： 472K
代理商： S-35399A03-J8T2G
2-WIRE REAL-TIME CLOCK
S-35399A03
Rev.2.0_00
Seiko Instruments Inc.
30
3. How to confirm setting value for register and result of correction
The S-35399A03 does not adjust the frequency of the crystal oscillation by using the clock-correction function. Therefore
users cannot confirm if it is corrected or not by measuring output 32.768 kHz. When the function to clock-correction is
being used, the cycle of 1 Hz clock pulse output from the
1
INT
pin changes once in 20 times or 60 times, as shown in
Figure 31
.
INT1 pin
(1 Hz output)
a
b
B0 = 0, a : 19 times, b : Once
B0 = 1, a : 59 times, b : Once
19 times or 59 times
Once
Figure 31 Confirmation of Correction Result
Measure a and b by using the frequency counter
*1. Calculate the average frequency (Tave) based on the measurement
results.
B0 = 0, Tave = (a
× 19 + b) ÷ 20
B0 = 1, Tave = (a
× 59 + b) ÷ 60
Calculate the error of the clock based on the average frequency (Tave).
The following shows an example for
confirmation.
Confirmation example: When B0 =0, 66h is set
Measurement results: a = 1.000080 Hz, b = 0.998493 Hz
Clock Correction Register Setting Value
Average Frequency [Hz]
Per Day [s]
Before correction
00 h (Tave = a)
1.000080
86393
After correction
66 h (Tave = (a
× 19 + b) ÷ 20) 1.00000065
86399.9
Calculating the average frequency allows to confirm the result of correction.
*1.
Use a high-accuracy frequency counter of 7 digits or more.
Caution
Measure the oscillation frequency under the usage conditions.
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