Epson RX-8564LC - Manual (Page 10)

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]
F
requenc
y
∆ 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 [ µ A]
2
Cu
rre
nt
c
ons
um
p
ti
o
n [
µ A]
Supply Voltage V DD [V]
1.0
0.5
3 4 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
3 4 5
Condition :
f SCL =0 Hz, Ta=+25 ° C, CLKOUT=32.768 kHz
I DD 32K[ µ A]
CL=0 pF C
u
rr
e
n
t c
o
n
s
um
pt
io
n
[
µ A]
Supply Voltage V DD [V]