Schematics

AD-KEY
V+
V-
PP
PA
USB TF
MCU
POWER
LED/M
LED&MOTO
BT-ANT
Y1
24M
C6
105
C3
105
0R
DM
DP
C4 105
1
PC5/SD0CLKA/ADC12
2
PC4/SD0CMDA/ADC11
3
USBDM/PC3/SD0DATA/ADC14
4
USBDP/ADC13
5
PA4/AUX0R/ADC3
6
PA3/AUX0L/ADC2
7
PA2/MIC_BIAS
8
PA1/MIC/ADC1
9
PA0/SD_PG/ADC0
10
DACVSS
11
VCOM
12
DACL
24
BT_OSCO
23
BT_OSCI
22
BT_RF
21
FMIP
20
VSSIO
19
ADC5/PB1
18
VDDIO
17
VBAT
16
PB5/LDO_IN
15
ADC7/SD0DATF/PB4
14
ADC8/AUX1L/SD0CMDF/PB6
13
DAC9/AUX1R/SD0CLKF/PB7
U2 AC6965E
1
2
3
4
5
6
7
8
9
TF
R14
3.3K
D
3
B
1
SD
2
BYPASS
3
A/B
4
IN
8
VOP
7
GND
6
VDD
5
VON
U3
8002
SP
R16
20K
C7
105
C5
223
C9
106
GND
DP
DM
+5V
1
2
3
4
6
5
USB
MIC
R2
9.1K
R4
24K
R17
100K
USB1
BAT1
3.7V
D2
RED
R8
4.7K
R12
1K
1
TEMP
2
PROG
3
GND
4
VCC
8
CE
7
SHRG
6
STDBY
5
BAT
U1
4056
R6
30K
R5
10K
。
1
2
T
10K
SW1
R
1
4
7
0
R
R3
15K
Q3
8050
R
1
9
1
K
R
R
Q4
8050
R
2
0
1
K
G
G
Q5
8050
R
2
1
1
K
B
B
Q2
2300
R
1
0
1
K
M
1
2
MOTO
D9
1
N
5
3
9
1
123
CH
SD_CMD
SD_CLK
SD_DAT
SD_CLK
SD_CLK
SD_CMD
SD_DAT
DACL
+3.3V
VBAT+
SDVC
MIC
MUTE
SD_DAT
DP
MUTE
SDVC
VBAT+
KEY
DP
VBAT+
GND
DACL
+
5
V
+5V
GND
KEY
IF
MIC
GND
VBAT+
GND
VBAT+
GND
VBAT+
GND
VBAT+
B
G
R
M
B
G
R
M
GND
IF
+3.3V
VBAT+