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RTC - 8564 JE/NB
10. Reference data
(1)Example of frequency and temperature
characteristics
θ
= +25 ° C Typ.
T
× 10
α = -0.035 × 10
-6
0
-50
-100
-150
-50
0
Temperature [ ° C]
(2) Example of frequency and voltage characteristics
+ 3
± 0
- 3
2
Supply Voltage V
(3) Current and voltage consumption characteristics
(3-1) Current consumption when non-accessed (i)
Condition :
=0 Hz, Ta=+25 °C, CLKOUT=OFF
f
SCL
1.0
0.5
2
Supply Voltage V
-6
Typ.
+50
+100
Condition :
3 V as reference, Ta=+25 °C
3
4
5
[V]
DD
when CLKOUT=OFF
I
[µA]
DD
3
4
5
[V]
DD
[Finding the frequency stability]
1. Frequency and temperature characteristics can be
approximated using the following equations.
∆f
= α ( θ
- θ
2
)
T
T
X
∆f
: Frequency deviation in any temperature
T
2
α
( 1 / °C
)
: Coefficient of secondary temperature
( ( −0.035±0.005 ) × 10
θ
( °C )
: Ultimate temperature (+25±5 °C)
T
θ
( °C )
: Any temperature
X
2. To determine overall clock accuracy, add the frequency
precision and voltage characteristics.
∆f/f = ∆f/fo + ∆f
+ ∆f
T
V
∆f/f
: Clock accuracy (stable frequency) in any
temperature and voltage.
∆f/fo
: Frequency precision
∆f
: Frequency deviation in any temperature.
T
∆f
: Frequency deviation in any voltage.
V
3. How to find the date difference
Date Difference = ∆f/f × 86400(Sec)
* For example: ∆f/f = 11.574 × 10
approximately 1 second/day.
(3-2) Current consumption when non-accessed (ii)
Condition :
f
SCL
10
5
Page - 13
-6
/ °C
-6
is an error of
when CLKOUT=32.768kHz
=0 Hz, Ta=+25 °C, CLKOUT=32.768 kHz
CL=30 pF
I
32K[µA]
DD
CL=0 pF
2
3
4
5
Supply Voltage V
[V]
DD
MQ - 322 - 04
2
)
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