Schematics

PE7/ADC9
1
AGND
2
PE0
3
VUSB
4
VDDIO
5
VBAT
6
DGND
7
VDDBT
8
PWRKEY
9
BT ANT
10
BT OSCI
11
BT OSCO
12
ADC5/PB3
13
ADC10/MICL/PF2
14
DACR
15
DACL
16
U1
12
BT-ANT1
ANTENNA_PIFA
GND
L1
NC
R1 0R
L2
NC
BT RF
BT-OSCI
BT-OSCO
Y1
26MHZ
C4
NC
C1 NC
GND
DACR
DACL
GND
VUSB
VDDIO
VDDBT
MUTE
GND
C6 105
C5 105
C3 104
C2 NC
GND
VBUS
1
D-
2
D+
3
GND
4
G
5
G
6
G
7
G
8
G
9
1
USB-MICRO
VUSB
BT1
3.4V~4.2V
C12
105
VBAT
R7
2K2
CHRG
1
GND
2
BAT
3
VCC
4
PROG
5
U3
4054
CHARGE
R6
1K
LED00
LED3
0603/
GND
S1
VMCU
VMCU
LOUL-
LOUL+
C9
683
R4 3K
GND
C7 105
MUTE
C8
106
GND
DACL
VMCU
C11 472
1
2
J1 SPK
R5
33K
GND
SD
1
BYP
2
MODE
3
IN
4
VON
5
VDD
6
GND
7
VOP
8
GND
9
U2
5128
LOUL+
LOUL-
C10
683
DACR
LED 2
LED2
VMCU
1
23
Q1
9014
GND
R2
10K
LED 2
R3
100K
VMCU
LED 1
LED1
0603/
GND
LED 1
AB5337
Red
Red