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RTC, Back
up
: 2
6.8K
182473
t
BDATA BUS
D3
IS2473
ADDRESS BUS
v
ZD 1
ba
02BZ4.7A
R30
2.7K
4 t
-"--
T r 6
,425
.'2.7K
1
*
1
E
C
t
T r 4
J A l O 1
B
z
R26
I K R27
10K
, .
.+
JC501
*
4 -
R28
1K
A
SENCE
I
A0
A 1
A2
A3
E
cs
~ A O
DO
~
A
l
D 1
~ A 2
D2
. A 3
D 3
(15) CKOUT
C51 30p
-
I S I O S C I N
vCc
I
11
12
13
14
t v
+5v
BDO
1
BD1
1
BD2
1
BD3
15
-
N.C
backup power
(+Back)
+5v
1
(4. 14.
15)
DKN
(2, 4. 14.
15)
(2. 4. 14.
15)
(4)
(4. 14)
m
E n ?
m
m
*
+5v
R A l O
47K*4
ABE
A I
- A 2
A
~ A 3
A
A4
1
-
back
up power
(+Back)
c54
!
1ou
t 5 v
J A l O l
SENSE
IC36, 37
C50
, .
54
R25
*
30
R A l O
TR4
*
6
D2
*
3
ZD 1
CTL4
BATT 1
-
74HC243
IC37
I
NOTE
:
backup power
=
3.6
-
4.4V
!
:
+V
=
12
-
13V
NO. 8
7-8
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