Schematics

1
1
2
2
3
3
4
4
D D
C C
B B
A A
BTOSCOBTOSCI
GND
GND
+3.3V
VMCU
GND
POWKEY VDDBT
VDDBT
RF
BT_ANT
BTOSCI
BTOSCO
BLUE
MICL
DACL
DACL#
GND
VUSB
VDDBT
RED
VDDDAC
GND
GND
C1 106
C2 106
L4
10UH
C3
106
L2NC
L11.5nh
L31.5p
1
2
BT_ANT
Y1
26M
C5
105
C6
104
GND
BLUE
RED
1 2
BLUE
1 2
RED
VMCU
GND
1
B+
1
B-
DACL
DACL#
1
L-
1
L+
C13
100PF
C12
100PF
GND
VDDDAC
MICL
C8 104
R1
6.8K
VUSB
GND
1
DC+
1
DC-
GND
C4
105
VDDBT
GND
12
+ MIC-2
AGND
1
VUSB
2
VDDIO
3
VBAT
4
LX
5
DGND
6
VDDBT
7
PWRKEY
8
BT_ANT
9
VDDBT
10
BT_OSCI
11
BT_OSCO
12
ADC6/PB4
13
ADC5/PB3
14
ADC2/PA7
15
MICL
16
VCMBUF
17
DACL
18
VDDDAC
19
VDDPA
20
GND
0
U1
AB5376A
L5 100NH
L-
L6 100NH
L+
R2
3.3K
+3.3V
GND
U2
NC
1
2
3 4
5
6POWKEY
C10
NC
GND
GND
C7
105
GND
VMCU
NC
POWKEY 1 2
K1
POW/PLAY