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RTC - 4543 SA/SB
11. Reference Data
(1) Example of Frequency-Temperature Characteristics
θ
T
α
= -0.035 × 10
× 10
-6
+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
Frequency [ ×10
-6
]
Conditions
5 V reference Voltage,
Ta=+25 °C
+1.0
0.0
2
-1.0
-2.0
Note :
This data shows values obtained from a sample lot.
= +25 °C Typ.
/ °C 2 Typ.
-6
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:
∆f
= α( θ
2
- θ
)
T
T
X
∆f
: Frequency deviation at any given temperature
T
α( /°C
)
2
: Second-order temperature
((-0.035±0.005)×10
: Highest temperature(+25 °C±5 °C)
θ
(°C)
T
θ
: 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 × 86400 (seconds)
With error of 11.574 × 10 -
about one second per day.
(3)Example of Current Consumption-Voltage
Characteristics
Current consumpiton[ µA ]
2.0
1.0
0.0
Page - 11
-6
2
/°C
)
+ ∆fv
6
, the error of the clock is
Conditions
No load, Ta=+25 °C
2.0
3.0
4.0
Supply voltage (V
) [V]
DD
5.0
MQ252-04
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