Table of Contents
Advertisement
RX - 8025 SA
NB
/
10. Reference Data
(1) Example of frequency and temperature characteristics
θ
T
× 10
α = -0.035 × 10
-6
0
-50
-100
-150
-50
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 :
Ta = +25 °C
1.0
f
= 0 Hz
SCL
FOE = GND, /INTA, /INTB = V
FOUT ; Output OFF
0.5
2
Supply Voltage V
= +25 °C Typ.
-6
Typ.
0
+50
+100
Condition :
3 V as reference, Ta=+25 °C
3
4
5
[V]
DD
when FOUT=OFF
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
T
T
X
∆f
T
α
(1 / °C
2
) : Coefficient of secondary temperature
θ
(°C)
T
θ
(°C)
X
2. To determine overall clock accuracy, add the frequency
precision and voltage characteristics.
∆f/f = ∆f/fo + ∆f
∆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 (seconds)
* For example: ∆f/f = 11.574 × 10
approximately 1 second/day.
(3-2) Current consumption when non-accessed (ii)
10
5
Page - 29
2
)
: Frequency deviation in any
temperature
(−0.035±0.005) × 10
-6
: Ultimate temperature (+25±5 °C)
: Any temperature
+ ∆f
T
V
-6
is an error of
when FOUT=32.768 kHz
Condition :
Ta = +25 °C
f
= 0 Hz
SCL
FOE, /INTA, /INTB = V
DD
FOUT ; 32.768 kHz output ON
CL=30 pF
CL=0 pF
2
3
4
5
Supply Voltage V
[V]
DD
ETM10E-04
/ °C
2
Advertisement
Table of Contents
