I 2 S A u d i o I / O C a r d
12
Rev. 0.1
5
5
4
4
3
3
2
2
1
1
D
C
B
A
Ground Access
User Input
User Feedback
SD/MMC Card
Electronic Board Identification (EBID)
P
W
R
_3.
3_B
U
L
K
P
W
R
_3.
3_B
U
L
K
P
W
R
_3.
3_B
U
L
K
P
W
R
_3.
3_B
U
L
K
P
W
R
_3.
3_B
U
L
K
P
W
R
_3.
3_B
U
L
K
A_
G
N
D
PW
R_
SYS_
BUL
K
PW
R_
SYS_
BUL
K
UDPBUS_
SCL
_
A
UDPBUS_
SDA_
A
C
2_D
A
T
_D
C
2_C
LK
_D
C
2_C
LK
_D
C
2_D
A
T
_D
GP
IO
0
1
ADC_
IN
0
GP
IO
0
2
GP
IO
0
0
SD_
S
W
SPI
_
N
SS0
_
E
ZR
SPI
_
M
O
S
I_
EZR
S
P
I_S
C
K
_E
ZR
SPI
_
M
IS
O
_
EZR
SPI
_
PW
R
Ti
tle
Si
ze
Do
cu
m
en
t Nu
m
b
er
Re
v
D
a
te
:
S
h
eet
of
400 W
C
esar
C
have
z
A
u
st
in
, TX
78701
UPI
O
-U
SB-
AUDI
O
1
.0
I2
S
A
U
D
IO
I/O
C
A
R
D
- I/O
B
25
Fr
iday,
M
a
y 04,
2012
Ti
tle
S
iz
e
D
o
cu
me
n
t N
u
mb
er
R
ev
D
a
te
:
S
h
eet
of
400 W
C
esar
C
have
z
A
u
st
in
, TX
78701
UPI
O
-U
SB-
AUDI
O
1
.0
I2
S
A
U
D
IO
I/O
C
A
R
D
- I/O
B
25
Fr
iday,
M
a
y 04,
2012
Ti
tle
S
iz
e
D
o
cu
me
n
t N
u
mb
er
R
ev
D
a
te
:
S
h
eet
of
400 W
C
esar
C
have
z
A
u
st
in
, TX
78701
UPI
O
-U
SB-
AUDI
O
1
.0
I2
S
A
U
D
IO
I/O
C
A
R
D
- I/O
B
25
Fr
iday,
M
a
y 04,
2012
R5
5
1K
R5
0
4.
7K
TP9
GN
D
BL
UE
R5
4
0
NI
R5
1
330
JS
2
Jum
p
er
S
hunt
TP10
A_
G
N
D
BL
UE
U1
0
SD/
M
M
C
CARD
DAT
3
/CS
1
CM
D/M
O
SI
2
GND
3
VDD
4
CL
K/SCL
K
5
GND
6
DAT
0
/M
ISO
7
DAT
1
8
DAT
2
9
SW
10
WP
11
CASE
12
CASE
13
C4
9
0.
1uF
JP
2
CO
NN SO
CKET 4
X
1
JP
3
JU
M
PER
S4
GP
IO
0
R6
9
100
R4
7
100K
R6
8
10K
1
3
2
U1
1
C
8051F990
P0
.1
_
A
G
N
D
1
GND
3
VDD
4
RST
_
C2
CK
5
P
2
.7
_C
2D
6
P1
.7
7
P1
.6
8
P0
.2
20
P1
.1
_
C
PO
-
13
P1
.0
_
C
PO
+
14
P1
.3
10
P1
.5
9
P1
.2
11
P0
.3
19
P
0
.7_I
R
E
F
15
P0
.6
_
C
O
N
VVST
R
16
P0
.0
_
V
REF
2
RX
_
P
0
.5
17
T
X
_P
0.
4
18
GND
EPAD
GND
12
D1
RED
GP
IO
2
D2
Bl
u
e
R4
8
4.
7K
C5
0
0.
1uF
C5
1
1uF
U9
S
N
74LV
C
1
G
66D
C
K
IN
1
OUT
2
GND
3
C
4
VCC
5
R5
3
0
NI
R4
9
100K
C5
2
0.
1uF
TP8
GN
D
BL
UE
S2
GP
IO
1
Figu
re
9.
UPIO-USB-AUDIO I/O Ca
rd
Schemati
c
(2 of 5
)