Schematics

MIC
D2 RED
L1
2.4NH
L3
NC
L2
NC
1
VDDDAC
2
AGND
3
PE0/MUTE
4
VUSB
5
VDDIO
6
VBAT
7
DGND
8
VDDBT
9
PWERKEY
10
BTANT
11
OSI
12
OS0
13
ADC5/USB_DP/PB3
14
IR/ADC10/MICL/PF2
15
DACR
16
DACL
U1
AB5337A
C6
104
C3
104
C4 105
C1
105
1
DP2
1
DM2
1
DM1
12
M1
1
GND
1
BATT+
1 2
CON2
2P/2.0mm
ANT4
C07
104
1 2
3 4
K5
POWER
R2 5.1K
C08
105
R31R
D1 BLUE
1
DM3
1
DM4
1
5V-
1
5V
1
34
2
BLUE-LED
PWRKEY
BT_OSC1
BT_OSC0
BLUE-LED
DACL
MIC
MUTE
VDDDAC
MIC
VBAT
VBAT
BLUE-LED
VBAT
PWRKEY
DACL#
VUSB
VUSB
VDDIO
VBAT
VDDIO
DACL
DACL#
BT_OSC0
BT_OSC1
Y1 26MHz