參數(shù)資料
型號(hào): S-35390A-J8T1G
元件分類: 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): 33/56頁(yè)
文件大?。?/td> 529K
代理商: S-35390A-J8T1G
2-WIRE REAL-TIME CLOCK
Rev.3.0_00
S-35390A
Seiko Instruments Inc.
39
2.
Measurement of oscillation frequency
When the S-35390A is turned on, the internal power-on detector operates and a signal of 1 Hz is output from the
1
INT
pin to select the crystal oscillator and optimize the Cg value. Turn the power on and measure the signal with a frequency
counter following the circuit configuration shown in Figure 51.
If 1 Hz signal is not output, the power-on detector does not operate normally.
Turn off the power and then turn it on
again.
For how to apply power, refer to “
Power-on Detection Circuit and Register Status”
.
Remark
If the error range is
±1 ppm in relation to 1 Hz, the time is shifted by approximately 2.6 seconds per month
(calculated using the following expression).
10
–6 (1 ppm) × 60 seconds × 60 minutes × 24 hours × 30 days = 2.592 seconds
INT1
INT2
SDA
SCL
S-35390A
VDD
XOUT
XIN
VSS
Cg
1 k
Ω
10 k
Ω
1 k
Ω
Frequency
counter
Open
or pull-up
Figure 51
Configuration of Oscillation Frequency Measurement Circuit
Caution
1.
Use a high-accuracy frequency counter of 7 digits or more.
2.
Measure the oscillation frequency under the usage conditions.
3.
Since the 1 Hz signal continues to be output, initialization must be executed during normal
operation.
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