Complete Schematics
6-32
STK525 Hardware User Guide
7608A–AVR–04/06
Figure 6-2 . Schematics, 2 of 5
Q1
BC
847B
C1
4
100nF
C1
3
100nF
PE0
PE2
PC
6
PC
4
PC
5
PC
2
PC
0
PC
1
PC
3
PC
7
PE1
R9
10k
GN
D
1
GN
D
2
AU
X
I0
3
AU
X
O
0
4
CT
7
5
CT
6
6
CT
5
7
CT
4
8
CT
3
9
CT
2
10
CT
1
11
BSEL2
12
(n
.c.)
13
RE
F
14
NRS
T
15
PE2
16
PE1
17
PE0
18
GN
D
19
GN
D
20
VT
G
21
VT
G
22
PC
7
23
PC
6
24
PC
5
25
PC
4
26
PC
3
27
PC
2
28
PC
1
29
PC
0
30
PA7
31
PA6
32
PA5
33
PA4
34
PA3
35
PA2
36
PA1
37
PA0
38
GN
D
39
GN
D
40
CO
N 2
x
2
0
J3
E
XP.
C
O
N
0
X
T
AL2
P
D
[7
..0
]
GN
D
1
GN
D
2
AU
X
I1
3
AU
X
O
1
4
DA
T
A
7
5
DA
T
A
6
6
DA
T
A
5
7
DA
T
A
4
8
DA
T
A
3
9
DA
T
A
0
10
DA
T
A
1
11
DA
T
A
9
12
SI
13
SO
14
SC
K
15
CS
16
XT
1
17
XT
2
18
VT
G
19
VT
G
20
GN
D
21
GN
D
22
PB7
23
PB6
24
PB5
25
PB4
26
PB3
27
PB2
28
PB1
29
PB0
30
PD
7
31
PD
6
32
PD
5
33
PD
4
34
PD
3
35
PD
2
36
PD
1
37
PD
0
38
GN
D
39
GN
D
40
CO
N 2
x
2
0
J2
E
XP.
C
O
N
1
Ti
tl
e
Siz
e
D
oc
um
ent
N
u
m
ber
R
e
v
D
a
te
:
S
heet
of
<D
o
c
>
1
.0
ST
K500 Ex
pand c
onnec
to
rs
A4
24
T
ues
day
, J
anuary
17,
2006
ST
KN
C
Im
port
ant
:
D
e
fault
c
onf
igurat
ion:
open
res
e
rv
ed f
o
r f
u
tu
re m
a
s
s
s
to
rage ex
tens
ion
3.
3V
SP3
S
T
K
525 M
E
Z
Z
A
N
IN
E
F
O
R
S
T
K
500
NRS
T
ST
KN
C
VT
G
X
T
AL1
PA0
R8
2k
PB7
PB3
PB5
PD
5
PD
7
PB1
PB6
PD
1
PD
3
PB2
PB4
PD
6
PB0
PD
2
PD
4
C1
2
1nF
PD
0
AR
EF
1
2
JP
3
ST
K
A
R
E
F
VT
G
RE
F
XT
2
XT
1
PE[
2
..
0
]
VT
G
VT
G
PE[
2.
.0
]
VT
G
P
C
[7
..0
]
P
C[7
..0
]
PB[
7.
.0
]
P
D[7
..0
]
PA[
7.
.0
]
PA[
7
..
0
]
PA5
PA7
PA6
PA1
PA3
PA4
1
2
JP
1
ST
K
X1
PA2
1
2
JP
2
ST
K
X2
PB[
7
..
0
]
