ST STM3221G-EVAL, Руководство пользователя

Страница: 55 / 65

UM1065 Schematics
Doc ID 018640 Rev 4 55/65
Figure 29. I/O expander
1 1
2 2
3 3
4 4
D
D
C
C
B
B
A
A
STMicroelectronics
T
itle:
N
u
m
b
er
:
R
e
v
:
S
heet
o
f
C.
1
(P
C
B
.S
C
H
)
Da
te
:
8/
1
5
/2
0
1
1
MB
7
8
6
1
3
2
0
STM
32
20-21-45-46
G-EVAL
IO_Expandor
Y-
1
IN
T
2
A0
/D
at
a
O
u
t
3
SC
L
K
4
SD
A
T
5
VC
C
6
Da
ta
in
7
IN
0
8
IN
1
9
GN
D
10
IN
2
11
IN
3
12
X+
13
Vi
o
14
Y+
15
X-
16
U2
4
S
T
M
P
E81
1
Q
T
R
Y-
1
IN
T
2
A0
/D
at
a
O
u
t
3
SC
L
K
4
SD
A
T
5
VC
C
6
Da
ta
in
7
IN
0
8
IN
1
9
GN
D
10
IN
2
11
IN
3
12
X+
13
Vi
o
14
Y+
15
X-
16
U2
9
S
T
M
P
E81
1
Q
T
R
R1
35
10K
+2V
8
I2
C
d
ev
ice
addre
ss
:0x
82
I2
C
d
ev
ice
addres
s:
0
x
8
8
+2V
8
+2V
8
R1
16
100
K
R1
32
100
K
IO
_
E
x
p
an
dor_S
C
K
IO
_
E
x
p
an
dor_S
D
A
IO
_
E
x
p
andor_I
N
T
T
o
uchS
cr
een_
X
+
T
o
uchS
creen_
X
-
T
o
uchS
cr
een_
Y
+
T
o
uchS
creen_
Y
-
EX
P
_
IO
2
EX
P
_
IO
3
EX
P
_
IO
4
EX
P
_
IO
5
EX
P
_
IO
6
EX
P
_
IO
7
EX
P
_
IO
8
EX
P
_
IO
9
EX
P
_
IO
1
0
EX
P
_
IO
1
1
EX
P
_
IO
1
2
EX
P
_
IO
1
R1
21
10K
R1
36
0 +2V
8
R1
17
10K R1
31
10K
+2V
8
C9
9
100
n
F
C1
15
100
n
F
PB
9
PB
6
PI
2