參數(shù)資料
型號(hào)： S-3531A
廠商： Seiko Instruments Inc.
英文描述： CMOS Real-Time Clock IC Supporting an IIC-Bus(支持IIC-BUS的CMOS實(shí)時(shí)時(shí)鐘芯片)
中文描述： CMOS實(shí)時(shí)時(shí)鐘IC支持一個(gè)IIC總線（支持IIC總線的實(shí)時(shí)時(shí)鐘芯片的CMOS）
文件頁(yè)數(shù)： 20/31頁(yè)
文件大?。?/td> 185K
代理商： S-3531A
REAL-TIME CLOCK
S-3531A
Seiko Instruments Inc.
19
Adjustment of Oscillating Frequency
1.Configuration of the oscillating circuit
Since crystal oscillation is sensitive to external noises (clock accuracy is affected), the fallowing measures must be taken in
configuring the oscillating circuit:
(1) S-3531A, crystal oscillator and external capacitor (Cg) are placed as close to each other as possible.
(2) Make high the insulation resistance between terminals and the board between XIN and XOUT.
(3) Do not place any signal or power lines close to the oscillating circuit.
XI
XOU
Cg
S-3531A
Figure 21 Connection
Cd
Rd
Rf
Crystal oscillator:32.768K Hz
CL=6pf
Cg=3 to 35pf
Oscillating circuit internal constant standard values:
Rf=20M
Rd=220K
Cd=12pf
Open or
pull-up
Frequency
counter
VDD
XI
XOUT
SDA
INT1
VSS
F
32K
SCL
Cg
S-3531A
Note 1:Use a high-accuracy
frequency counter (1ppm
order).
Note 2:Since the 1 Hz signal
continues to be output, you
must send the reset command
in normal operation.
Note 3:Determine Cg with its
frequency slow/fast range
property referred.
Figure 22 Connection diagram
2.Measurement of oscillating frequencies
When power is turned on, S-3531A has the internal power-on detecting circuit operating and outputs a signal of 1 Hz from the
INT1 terminal to select the crystal oscillator and optimize the Cg value. Turn power on and measure the signal with a
frequency counter following the circuit configuration shown in Figure 22. Refer to 11 and 14 pages in this document for further
information.
(*)
If the error range is
±
1ppm in relation to 1 Hz, time is shifted by approximately 2.6 seconds a month:
10
-6
(1ppm)
×
60 seconds
×
60 minutes
×
24 hours
×
30 days = 2.592 seconds
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