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RX
8564 LC
9. Reference data
(1) Example of frequency and temperature characteristics
= +25 C Typ.
T
-6
10
= -0.035
0
-50
-100
-150
-50
0
Temperature [ C]
(2) Current and voltage consumption characteristics
(2-1) Current consumption when non-accessed (i)
Condition :
f
=0 Hz, Ta=+25 C, CLKOUT=OFF
SCL
1.0
0.5
2
Supply Voltage V
-6
10
Typ.
50
100
when CLKOUT=OFF
I
[ A]
DD
3
4
5
[V]
DD
[ Finding the frequency stability ]
1. Frequency and temperature characteristics can be
approximated using the following equations.
2
f
=
(
)
T
T
X
! f
: Frequency deviation in any temperature
T
!
2
[ 1 / C
]
: Coefficient of secondary temperature
!
[ C ]
: Ultimate temperature ( +25 5 C )
T
!
[ C ]
: Any temperature
X
2. To determine overall clock accuracy, add the
frequency precision and voltage characteristics.
f/f = f/fo + f
+ f
T
! f/f
: Clock accuracy (stable frequency)
! 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 =
For example:
approximately 1 second/day.
(2-2) Current consumption when non-accessed (ii)
Condition :
f
=0 Hz, Ta=+25 C, CLKOUT=32.768 kHz
SCL
10
5
Page
7
6
( 0.035 0.005 ) 10
/ C
V
in any temperature and voltage.
f/f
86400(Sec)
-6
f/f = 11.574 10
is an error of
when CLKOUT=32.768kHz
CL=30 pF
I
32K[ A]
DD
CL=0 pF
2
3
4
5
Supply Voltage V
[V]
DD
ETM12E-01
2
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