Schematics

K1
Y1
ANT
LED2 LED1
USB1
U3
R3
B+
B-
C2
R7
U1
C8 C5
C4
DM
DP
J1
R2
R8
C1
LED3
R1
U5
R15
R9
C14
RU1
C13
C7
C6
C9
R6
R5
C3
C12
C11 C10
USB3
B+1
GND
BT_OSCI
BT_OSCO
BLUE
LDO_IN
B+
VOUT
BT_AVDD
VBAT
LDO_IN
PP
AUX_R
VI
VDDIO
R
L
RL-
BLUE
AUX_DET
DP
DM
DM
DP
PP
PO
FM
$$$6
5VIN
$$$6
VI
VOUT
AUX_DET
AUX_L
AUX_R
AUX_L
R
L
PO
B+
Power Supply
ON
OFF
PP/PO
24MHz
BLUE
RED
NC4054
NC
NC
0R
AC6955F_QSOP24
105 105
105
0R
0R
NC
NC
NC
MX3510
0R
NC
NC
PC-PC
105
105
105
105
5K1
5K1
2.7P
30P
104 106
1 2
VCC
DM
DP
GND
1
2
3
4
5
1
USBDM
2
USBDP/ADC12
3
PA1/AUX0R/ADC0
4
PA0/AUX0L
5
PC7/MIC_BIAS
6
MIC
7
VDDIO
8
DACVSS
9
VCOMO
10
DACL
11
DACR
12
FMIP
24
BT_OSCO
23
BT_OSCI
22
VSSIO
21
BT_RF
20
ADC5/PB1
19
BT_AVDD
18
VBAT
17
PB5/LDO_IN
16
ADC8/AUX1R/SD0DATB/PB8
15
AUX2L/SD0CLKB/PB9
14
ADC9/AUX2R/SD0CMDB/PB10
13
SD_PWR/PB11
1
2
3
4
3
VDD
4
VM
5
VM
2
G
1
NC
1
2
3
1
2
3