Schematics

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A1
REF:C:/PADS/LOGFIL/RDA-BT.SCH
Battery3.7V
B+
B-
1
R+
1
R-
1
L+
1
L-
1
VCC
2
D-
3
D+
4
NC
5
GND
6
7 8
9
USB2
1
A
2
K
LED2
RED
1
A
2
K
LED3
B
1
BT-ANT
ANT
1
2
34
S1
POW
C11 102*
MIC+
MIC-
1 2
C7
105
C1 105
C6
2P7
C8
105
C9
105
C4
105
L3
NC
C5
105
1
DACVSS
2
AVDD
3
VDDIO
4
PB8
5
PB7/AUX0R/ADC9
6
PB6/AUX0L/ADC8
7
PGND
8
SW
9
VBAT
10
LDO_IN
11
BT_AVDD
12
PB3/OSC32KI
13
PB2/OSC32KO/ADC12
14
PB1/ADC6
15
PB0
16
BT_RF
17
VSSIO
18
OSCI
19
OSCO
20
ADC5/SD1CLK/PA10
21
ADC4/SD1CMD/PA9
22
SD1DAT/PA8
23
DVDD
24
ADC11/DM
25
ADC10/DP
26
AC2/AUX1R/PA4
27
ADC0/MIC/PA1
28
DACR
29
DACL
30
VCOMO
31
DACVDD
32
VCOM
U1
AC6956A
C3
105
1
DP
1
DM
C10 104
R2 1R
1
2
3
4
Y1
24MHz-9P
1 2
R3 NC
+
-
1
2
MIC1
1
GND1
2
GND2
3
VIN
4
OUT
5
GND3
6
GND4
U2
LP5300
C12
105*
NTC
R1 10K*
KEY0_PWR
DACL
DACR
BAT+
MIC
R_LED
B_LED
LDOIN
VCOMO
MIC_BIAS
MIC
DACR DACL
VCOMO
BAT+
LDOIN
KEY1
KEY0_PWR
KEY2
SD_CLK/AUX_DET
B_LED
R_LED
DP
VCOM DACVDD
DVDD
MIC_BIAS
LDOIN
NTC
NTC