參數(shù)資料
型號(hào)： S-3511A
廠商： Seiko Instruments Inc.
英文描述： CMOS Real-Time Clock IC（3 Lines）(3線，CMOS實(shí)時(shí)時(shí)鐘芯片)
中文描述： CMOS實(shí)時(shí)時(shí)鐘IC（3線）（3線，實(shí)時(shí)時(shí)鐘芯片的CMOS）
文件頁(yè)數(shù)： 18/31頁(yè)
文件大?。?/td> 183K
代理商： S-3511A
Real-Time Clock
S-3511A
Seiko Instruments Inc.
17
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-3511A, 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.
2.
Measurement of oscillating frequencies
(*)If the error range is ±1ppm in relation to 1HZ, time is shifted by approximately 2.6 seconds a month:
10
-6(1ppm)
60 seconds 60 minutes 24 hours 30 days = 2.592 seconds
XIN
XOUT
Cg
S-3511A
Figure 18 Connection diagram
Cd
Rd
Rf
Crystal oscillator:32.768KHZ
CL=6pf
Cg=3 to 35pf
Oscillating circuit internal constant standard values:
Rf=20M
Rd=220K
Cd=12pf
When power is turned on, S-3511A has the internal power-on detecting circuit operating and outputs a signal of 1HZ from the INT
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 9 and 12 pages in this document for further information.
INT
Frequency
counter
VDD
XIN
XOUT
SIO
VSS
CS
SCK
Cg
Open
S-3511A
Note 1: Use a high-accuracy frequency
counter (1ppm order).
Note 2: Since the 1HZ 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 19 Connection diagram
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