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RX − 8564 LC
Page − 7
ETM12E-01
9. Reference data
(1) Example of frequency and temperature characteristics
-150
-100
-50
0
-50 0 50 100
Temperature [°C]
Frequency
∆
f
T
× 10
-6
θ
T
= +25 °C Typ.
α = -0.035 × 10
-6
Typ.
[ Finding the frequency stability ]
1.
Frequency and temperature characteristics can be
approximated using the following equations.
∆f
T
= α ( θ
T
− θ
X
)
2
!
∆f
T
: Frequency deviation in any temperature
!
α
[
1
/
°
C
2
]
: Coefficient of secondary temperature
( −0.035 ± 0.005 ) × 10
−
6
/ °C
2
!
θ
T
[
°
C
]
: Ultimate temperature
(
+25
±
5
°
C
)
!
θ
X
[
°
C
]
: Any temperature
2. To determine overall clock accuracy, add the
frequency precision and voltage characteristics.
∆
f/f
=
∆
f/fo
+
∆
f
T
+
∆
f
V
!
∆f/f : Clock accuracy (stable frequency)
in any temperature and voltage.
!
∆
f/fo : Frequency precision
!
∆
f
T
: Frequency deviation in any temperature.
!
∆
f
V
: Frequency deviation in any voltage.
3. How to find the date difference
Date Difference = ∆f/f × 86400(Sec)
∗
For example:
∆
f/f = 11.574
×
10
-6
is an error of
approximately 1 second/day.
(2) Current and voltage consumption characteristics
(2-1) Current consumption when non-accessed (i)
when CLKOUT=OFF
I
DD
[µA]
2
Current consumption [
µ
A]
Supply Voltage V
DD
[V]
1.0
0.5
34 5
Condition :
f
SCL
=0 Hz, Ta=+25 °C, CLKOUT=OFF
(2-2) Current consumption when non-accessed (ii)
when CLKOUT=32.768kHz
CL=30 pF
2
10
5
345
Condition :
f
SCL
=0 Hz, Ta=+25 °C, CLKOUT=32.768 kHz
I
DD
32K[
µ
A]
CL=0 pF
Current consumption [
µ
A]
Supply Voltage V
DD
[V]