參數(shù)資料
型號(hào): V3020
廠商: Electronic Theatre Controls, Inc.
英文描述: Ultra Low Power 1-Bit 32 kHz RTC
中文描述: 超低功耗1位32 kHz的時(shí)鐘
文件頁數(shù): 5/14頁
文件大?。?/td> 470K
代理商: V3020
5
Typical Frequency on I/O Pin
+80
+30
-20
-70
-120
-170
+3
+2
+1
0
-1
-2
s/day
Address 10 hex = 00 hex
Quartz with 8.2 pF load capacitance
External trimming capacitor between X and V [pF]
O
T
[ C]
A
Typical drift for ideal 32'768 Hz quartz
Note :
The trimming capacitor value must not exceed 15 pF.
Greater values may disturb the oscillator function.
Fig. 5
-50
-30
-10
+10 30
50
70
90
0
3
6
9
12
15
[ppm]
D
F
F
o
Quartz Characteristics
= the ratio of the change in frequency to the nominal value
expressed in ppm (It can be thought of as the frequency
deviation at any temperature.)
= the temperature of interest in C
= the turnover temperature (25 ± 5 C)
To determine the clock error (accuracy) at a given temperature, add
O
the frequency tolerance at 25 C to the value obtained from the
formula above.
Fig. 6
[ppm]
-100
-200
-300
-400
T - 100
T - 50
Temperature [ C]
O
O
T [ C]
T
O
T +50
T +100
D
F
F
o
D
F
F
o
ppm
O
C
2
=-0.038
(T - T ) ±10%
D
F/F
o
T
T
O
F
m
mx
V3020
R
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