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參數(shù)資料
| 型號： | V30218S |
| 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)： | 3/12頁 |
| 文件大?。?/td> | 442K |
| 代理商： | V30218S |
The V3021 will run slightly too fast, in order to allow the user to
adjust the frequency, depending on the mean operating
temperature. This is made since the crystal adjustment can only
work by lowering the frequency with an added capacitor
3
between XO and V . The printed circuit capacitance has also to
be taken in consideration. The V3021 in DIL8 package, running
with an 8.2 pF crystal at room temperature, will be adjusted to
better than ± 1 s/day with a 6.8 pF capacitor.
Typical Frequency on I/O Pin
80
30
-20
-70
-120
-170
[ppm]
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]
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. 3
-50
-30
-10
10
30
50
70
90
0
3
6
9
12
15
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)
O
O
To determine the clock error (accuracy) at a given temperature, add
the frequency tolerance at 25 C to the value obtained from the
formula above.
Fig. 4
[ppm]
-100
-200
-300
-400
T -100
T -50
O
Temperature [ C]
T [ C]
T
O
T +50
T +100
D
F
F
0
D
F
F
o
ppm
O
C
2
= - 0.038
(T - T ) ±10%
D
F/F
o
T
T
O
m
mx
F
R
V3021
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| V3021DL8A | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power 1-Bit 32 kHz RTC |
| V3021SO8A | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power 1-Bit 32 kHz RTC |
| V3021SO8B | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power 1-Bit 32 kHz RTC |
| V3021XDL8A | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power 1-Bit 32 kHz RTC |
| V3021XSO8A | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power 1-Bit 32 kHz RTC |
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