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Reference Data - Epson RTC-4543SA Applications Manual

Real time clock module
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RTC - 4543 SA/SB

11. Reference Data

(1) Example of Frequency-Temperature Characteristics
T
= -0.035
-6
10
+10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-50 -40 -30 -20 -10
(2)Example of Frequency-Voltage
Characteristics
-6
Frequency [ 10
]
Conditions
5 V reference Voltage,
+1.0
Ta=+25 C
0.0
2
-1.0
-2.0
Note :
This data shows values obtained from a sample lot.
= +25 C Typ.
/ C 2 Typ.
-6
10
0
+10 +20 +30 +40 +50 +60 +70 +80 +90+100
Temperature [°C]
3
4
5
Supply voltage (V
)[V]
DD
Determining the frequency stability (clock accuracy)
1.The frequency-temperature characteristics can be
approximated by the following equation:
2
f
= (
-
)
T
T
X
f
: Frequency deviation at any given temperature
T
2
C
: Second-order temperature
((-0.035 0.005) 10
( C)
: Highest temperature(+25 C 5 C)
T
: Any given temperature
( C)
X
2. In order to determine the clock accuracy, add in the
frequency tolerance and the voltage characteristics.
f/f = f/f
+ f
0
T
f
/f
: Clock accuracy at any given temperature
and voltage (frequency stability)
f/f
: Frequency accuracy
0
f
: Frequency deviation at any given temperature
T
f
: Frequency deviation at any given voltage
v
3. Determining the daily error
Daily error = f/f
With error of 11.574
about one second per day.
(3)Example of Current Consumption-Voltage
Characteristics
Current consumpiton[ A ]
2.0
1.0
0.0
Page - 11
-6
2
/ C
)
+ fv
86400 (seconds)
10 -
6
, the error of the clock is
Conditions
No load, Ta=+25 C
2.0
3.0
4.0
Supply voltage (V
) [V]
DD
MQ - 252 - 03
5.0

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