Schematics

PA
MCU
POWER
PREV
NEXT
PP
CALL
KEY
POWER
D
C
5
V
I
N
LED
1
SD
2
BYPASS
3
A/B
4
IN
8
VOP
7
GND
6
VDD
5
VON
U2
8002D
SPK
R6
30K
C4
105
C1
106
C2
223
R3
68K
D3
BLUE
MIC
Y1
24MHz
BTANT
C8
105
C6
1
VDDIO
2
VBAT
3
LDO/PB5
4
BT_AVDD
5
PB3/ADC6
6
PB1/ADC5
7
BT-RF
8
VSSIO
16
ADC1/MIC/PA1
15
AGND
14
DACL
13
DACR
12
MIC_BIAS/PA3/USBDP
11
ADC14/USBDM
10
OSCO
9
OSCI
U3
AC6969A
C7
105
C5
105
R13
9.1K
R9
51K
BAT
3.7V
D1
RED
R11
4.7K
R2
1K
C3
105
1
TEMP
2
PROG
3
GND
4
VCC
8
CE
7
SHRG
6
STDBY
5
BAT
U1
4056
R10
24K
R4
9.1K 1%
。
1
2
T
10K
R7
24K
R14
15K
Q1
8050
D
2
R
G
B
D
6
R
G
B
D
4
R
G
B
R
1
2
1
K
MUTE
VBAT
DACL
GND
MIC
ADKEY
+3.3V
LED
VBAT
LDO
LED
ADKEY
LED2
MIC
+3.3V
MUTE
+5V
+5V
VBAT
DACL
LED2
VBAT