Reference Data - Epson RX-8581JE Applications Manual

RX - 8581 SA JE
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10. Reference Data

(1) Example of frequency and temperature characteristics
T
-6
10
= -0.035
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, /INT = V
FOUT ; Output OFF
0.5
2
Supply Voltage V
NB
/
= +25 C Typ.
-6
10 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 = ( -
T T X
f
T
2
) : Coefficient of secondary temperature
(1 / C
( C)
T
( C)
X
2. To determine overall clock accuracy, add the frequency
precision and voltage characteristics.
f/f = f/fo + f
: Clock accuracy (stable frequency) in any
f/f
temperature and voltage
f/fo : Frequency precision
: Frequency deviation in any temperature
f
T
: Frequency deviation in any voltage
f
V
3. How to find the date difference
Date difference =
* For example:
approximately 1 second/day.
(3-2) Current consumption when non-accessed (ii)
10
5
Page - 27
2
)
: Frequency deviation in any
temperature
-6
( 0.035 0.005) 10
: Ultimate temperature (+25 5 C)
: Any temperature
+ f
T V
f/f 86400 (seconds)
-6
f/f = 11.574 10 is an error of
when FOUT=32.768 kHz
Condition :
Ta = +25 C
f = 0 Hz
SCL
FOE, /INT = V
DD
FOUT ; 32.768 kHz output ON
CL=30 pF
CL=0 pF
2 3 4 5
Supply Voltage V [V]
DD
2
/ C
MQ372-02