Atmel Evaluation-Board AT90USBKey AT90USBKey AT90USBKey-2 Data Sheet
Product codes
AT90USBKey-2
Complete Schematics
AT90USBKey Hardware User Guide
6-19
7627A–AVR–04/06
Figure 6-1 . Schematics, 1 of 2
C7
1uF
C
3216-A
VBU
S
RS
T
RS
T
D
T
SM
-3
AVC
C
P
D[7
..0
]
P
D
[7
..0
]
PA0
U
C
AP C
apac
it
or
C
los
ed t
o
t
he M
C
U
VC
C
PA1
R4
0
R
0603
PE0
PF7
PE2
PE1
PE4
PE3
PE6
PE[
7.
.0
]
PE5
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
J2
1.
27 m
m
D
ual
H
1
.27-10
PE7
PA3
UGND
(not mounted)
PE2
VC
C
PA[
7
..
0
]
PA[
7
..
0
]
PA[
7
..
0
]
PF0
PA2
RESET
PA4
PF2
Reset Circuit
UV
CO
N
VBU
S
PA5
HWB
HWB
D
T
SM
-3
R1
0
R
0603
PF4
R
ESET
UG
ND
R8
0
R
0603
PA6
AGN
D
C1
100nF
C
0603
PF1
UCA
P
PA7
(not mounted)
(not mounted)
(not mounted)
PF3
PE2
P
F[7
..0
]
PC
7
R5
0
R
0603
VC
C
C9
220nF
C
0603
(not mounted)
PE4
VC
C
PB[
7.
.0
]
PB[
7
..
0
]
PB[
7
..
0
]
PE5
PC
6
VC
C
AVC
C
C2
100nF
C
0603
GN
D
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.
0
CP
U
A4
12
M
onday
, J
anuary
09,
2006
PE6PE6
PF6
PC
5
PD0
PD2
PD1
PD4
PD3
PD6
P
D[7
..0
]
PD5
(not mounted)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
J4
1.
27 m
m
D
ual
H
1
.27-10
PD7
PC
4
QFN64
VC
C
PB0
VC
C
F
e
rrit
e & c
apac
it
ors
c
los
ed t
o
t
he M
C
U
PB0
PB2
PB1
PB4
PB1
PB3
PB6
PB[
7.
.0
]
PB5
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
J6
1.
27 m
m
D
ual
H
1
.27-10
PB7
PA0
1-V_BU
S
3-D
+
2-D
-
4-I
D
5-GN
D
S
HIE
L
D
S
HIE
L
D
S
HIE
L
D
S
HIE
L
D
U
SB_M
iniABF
<
ASSEM
BLY
>
J3
M
INI_
US
B
C
PA2
PA1
PA4
PA3
PA6
PA[
7.
.0
]
PB2
PA5
PC
3
P
F[7
..0
]
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
J7
1.
27 m
m
D
ual
H
1
.27-10
PA7
R6
47k
R
0603
PE7
2
UV
cc
3
D-
4
D+
5
UG
ND
6
UCA
P
7
VBU
S
8
PE3
9
PB0
10
PB1
11
PB2
12
PB3
13
PB4
14
PB5
15
PB6
16
PB7
17
PD0
25
PD1
26
PD2
27
PD3
28
PD4
29
PD5
30
PD6
31
PD7
32
PE4
18
PE5
19
AREF
62
RESET
20
GND
53
GND
63
GND
22
XTAL2
23
XTAL1
24
PE0
33
PE1
34
PE6
1
PE2
43
PC
0
35
PC
1
36
PC
2
37
PC
3
38
PC
4
39
PC
5
40
PC
6
41
PC
7
42
PA7
44
PA6
45
PA5
46
PA4
47
PA3
48
PA2
49
PA1
50
PA0
51
PF7
54
PF6
55
PF5
56
PF4
57
PF3
58
PF2
59
PF1
60
PF0
61
VCC
52
VCC
21
AVCC
64
AT
90U
SB128
U1
Q
FN6
4
PB3
UV
CO
N
P
E
7
C5
100nF
C
0603
VC
C
DE
CO
UP
L
ING
CA
P
A
CIT
O
R
S
C
L
OSED
T
O
T
H
E D
EVI
C
E
M
C
U
Pin3
VBU
S
PC
2
PB4
Y
1
8
M
Hz
CRY
S
T
A
L
8M
H
z
49U
S
C1
1
15pF
C
0603
C1
0
15pF
C
0603
PC
1
PB5
PC0
PC2
PC1
PC4
PC3
PC6
P
C[7
..0
]
PC5
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
J5
1.
27 m
m
D
ual
H
1
.27-10
PC7
VBU
S
AR
EF
PC
0
PB6
PE[
7.
.0
]
PE1
PB7
VC
C
PF0
PE0
C8
220nF
C
0603
UG
ND
UG
ND
UG
ND
UG
ND
UG
ND
P
C[7
..0
]
P
C
[7
..0
]
C3
100nF
C
0603
GN
D
PF1
R3
2
2
R
0603
R7
47k
R
0603
R2
2
2
R
0603
R
ESET
D+
C4
100nF
C
0603
D-
UID
P
E
3
PF2
A
90U
S
B
K
e
y
VC
C
GN
D
PD0
XTAL2
PD1
PD2
PF5
PF3
PD3
AGN
D
CR1
PGB0010603
R
0603
PA[
7
..
0
]
PA[
7
..
0
]
PA[
7
..
0
]
CR2
PGB0010603
R
0603
PD4
XTAL1
VC
C
PD5
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
J1
1.
27 m
m
D
ual
H
1
.27-10
PD6
DE
CO
UP
L
ING
CA
P
A
CIT
O
R
S
C
L
OSED
T
O
T
H
E D
EVI
C
E
M
CU P
in
5
2
R
ESI
ST
OR
S
C
L
OSED
T
O
T
H
E D
EVI
C
E
PD7
PF4
VC
C
X
T
AL2
VC
C
UCA
P
PF7
UV
CC
D
+
D
- R
ESI
ST
OR
S
C
los
ed t
o
t
he M
C
U
PF5
Bootloader Activation
C6
100nF
C
0603
VC
C
PA[
7.
.0
]
VC
C
AR
EF
DE
CO
UP
L
ING
CA
P
A
CIT
O
R
S
C
L
OSED
T
O
T
H
E D
EVI
C
E
M
CU P
in
2
1
PF6
X
T
AL1