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Figure 8-3: Audio module connection schematics
MP3-CS#
C20
22pF
C19
22pF
R1 1M
R20
10K
R21 10K
MP3-DREQ
X2
12.288MHz
C13
1uF
GPIO
VCC-3.3
LEFT
RIGHT
GBUF
E1 10uF
E2 10uF
CN2
PHONEJACK
LEFT
RIGHT
C16
10nF
C14
47nF
C15
10nF
R27
10
R30
20
R31
20
R28
10
R29
10
R32
470
C17
3.3nF
R17
100K
R33
470
C18
3.3nF
R18
100K
L
R
R22
27
2
3
4
5
6
7
11
12
13
14
25
24
23
22
21
18
17
16
15
8
1
19
9
10
27
26
20
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
MCP/LN1
MICN
XRESET
DGND0
CVDD0
IOVDD0
CVDD1
DREQ
GPIO2
GPIO3
GPIO6
GPIO7
XDCS/BSYNC
IOVDD1
VC0
DGND1
XTAL0
XTAL1
IOVDD2
DGND2
DGND3
DGND4
XCS
CVDD2
GPIO5
RX
TX
SCLK
SI
SO
CVDD3
XTEST
GPIO0
GPIO1
GND
GPIO4
AGND0
AVDD0
AVDD2
AGND1
AGND2
AGND3
LN2
LEFT
RCAP
AVDD1
GBUF
RIGHT
VS1053
U2
VCC-1.8
VCC-3.3
MP3-RST#
MP3-RST#
R2
10K
R19
10K
VCC-3.3
MP3-CS#
MP3-DCS
MISO0-PA4
SCK0-PA2
MOSI0-PA5
C11
100nF
C10
100nF
C4
100nF
C12
100nF
C9
100nF
C23
100nF
VCC-3.3
C24
100nF
VCC-3.3
C26
100nF
VCC-3.3
VCC-3.3
C27
100nF
VCC-1.8
VCC-1.8
VCC-1.8
VCC-1.8
VCC-3.3
C29
2.2uF
VCC-3.3
R46
22K
E10
10uF
R47
120K
VCC-1.8
VCC-1.8
R50
12K1
1
2
3
5
4
Vin
GND
EN
ADJ
Vout
U3
AP7331-ADJ
VCC-3.3
C2
22pF
C1
22pF
X1
8MHz
R5
27
R4
27
AVCC
30
29
28
27
34
33
58
57
56
55
54
53
52
46
36
35
42
43
44
45
37
50
9
48
49
11
12
32
72
69
68
67
66
65
64
63
4
3
78
77
24
23
18
17
16
15
14
13
5
6
7
8
10
79
80
1
2
22
21
20
19
62
61
60
59
38
39
40
41
47
71
31
51
70
26
25
76
75
74
73
LM3S9B95
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
PA7
PA6
ERBIAS
VDD
PF4
PF5
PE5
PE4
LDO
VDD
GND
VDD
PB1/USB0VBUS
VDD
VDD
TXOP
PJ4
PJ5
PJ6
PJ7
GND
TXON
PB5
PB6
PB7
VDD
VDDC
PJ1
PH2
PH3
GNDA
VDDA
PD5
PD4
PE3
PE2
GND
PB4
PD2
PA2
PC6
PC7
GND
VDD
PG0
PG1
USB0DP
USB0DM
NC
PB3/I2C0SDA
PJ0
PD1
PD0
VDDC
PD6
PD7
PE7
PE6
PA1
PA0
PC4
PC5
OSC1
PJ3
PB0/USB0ID
PF2
PF0
OSC0
GND
PJ2
RXIN
MDIO
PF1
PH0
XTALNPHY
XTALPPHY
PH7
PG7
RXIP
PF3
RST
PH1
PA5
PA4
PA3
PD3
GND
PH6
PH5
PB2/I2C0SCL
PC2
PH4
USB0BIAS
PE0
PE1
PC3
PC1
PC0
VDD
GND
U1
MP3-DCS
MP3-RST#
MP3-DREQ
OSC0
OSC1
SCK0-MCU
MISO0-PA4
MOSI0-MCU
SCK0-PA2
MOSI0-PA5
MP3-CS#
R61
9K1
E9
10uF
VCORE
VCORE