Schematics

CHARGING
BAT UP
MIC
KEY
LED
AUDIO
BT
C12 NC
R12
NC R10
NC
R11
0R
Y1
26MHZ
D2
RED_LED
D1
BLUE_LED
BT1
4.2V
UPDATE
VBAT
GND
1
GND
2
5V
B-
B+
10
VDDBT
7
VDDBT
8
PWRKEY
5
LX
6
DGND
4
VBAT
2
VUSB
18
DACL
16
ADC10/MIC/PF2
11
BT_OSCI
12
BT_OSCO
9
BT_ANT
3
VDDIO
19
VDDDAC
1
AGND
0
RFGND
17
VCMBUF
20
VDDPA
13
ADC6/PB4
14
ADC5/PB3
15
ADC2/PA7
U1
AB5616E
BT-ANT1
L+
L-
21
MIC1
R2
2R2
S1
PWRKEY
L8
2.7NH
C10105
VDDIO
VBAT
VUSB
CHRG_LED
BLUE_LED/UPDATE
VBAT
VBAT
GND
BLUE_LED/UPDATE
OSCO
BT_RF
PWRKEY
VDDBT
OSCI
BLUE_LED/UPDATE
CHRG_LED
DACL#
DACL
MICIN
DACL
DACL#
VUSB
PWRKEY
VDDDAC
MICIN