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參數(shù)資料
| 型號： | RTC4573 |
| 廠商： | 愛普生（中國）有限公司 |
| 英文描述： | Serial RTC with Alarm and Timer |
| 中文描述： | 串行實時時鐘與鬧鐘和定時器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 157K |
| 代理商： | RTC4573 |
Page-10
Aug.1998
n
Reference data
( 1 ) Frequency temperature characteristics
( typical )
q
T
= 25°C TYP.
a = -0.035ppm/°C2 TYP.
Temperature [°C]
F
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
Finding the frequency stability (clock error)
1. The frequency temperature characteristics can be
approximated by using the following expression:
Df
T
(ppm)=a(q
T
-q
X
)
2
D
f
T
(ppm)
: Frequency deviation at target temperature
a
(ppm/
: Secondary temperature coefficient
(-0.035
0.005ppm/
q
T
q
X
: Target temperature
(
)
°
C
2
)
°
C
(
)
: Peak temperature
(25
5
)
2. To determine the overall clock accuracy, add the
frequency tolerance and the voltage characteristics:
Df/f(ppm) = Df/f0 + Df
T
+ Df
V
D
f
(ppm)
: Clock accuracy at a given temperature
and voltage
: Frequency tolerance
D
T
: Temperature dependent frequency
deviation
: Voltage dependent frequency deviation
f
(ppm)
D
V
/f
D
f
(ppm)
(ppm)
/f
0
f
3. Finding the daily deviation:
Daily deviation (seconds) = Df/f x 10
-6
x 86400
The clock error is one second per day at 11.574 ppm.
( 2 ) Frequency voltage characteristics
( typical )
- 5
2
Frequency[ppm]
Supply voltage V
DD
[V]
- 10
+ 10
+ 5
0
3
4
5
Conditions
3V reference , Ta=+25
°
C
( 3 ) Current consumption voltage characteristics
( typical )
1
2
Current consumption [μA]
Supply voltage V
DD
[V]
4
3
2
3
4
5
Conditions
CE0,CE1=0V,No load
Ta=+25
°
C
Note : This data shows average values for a sample lot.
For rated values, see the spacifications on page 3.
)
°
C
°
C
°
C
°
C
±
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