Schematics

1 2 3 4
A
B
C
D
4321
D
C
B
A
VBAT
S1
POWER
PWRKEY
S2
NEXT/VOL+
S3
PREV/VOL-
+5V
VBUS
1
D-
2
D+
3
ID
4
GND
5
S
0
S
0
S
0
S
0
JACK1
USB-MICRO
LED2
RED
LED1
BLUE
MICIN
BAT+1
B+
BAT-1
B-
DACL
+5V
C3 NC
VBAT
VDDIO
C5 NC
C2 105
C4 NC
MICIN
Y1
26MHZ
PB3
L3
NC
L1 0R
L2
NC
PWRKEYBT_VDD
VDDIO
5
VBAT
6
VDDBT
8
AGND
2
DGND
7
BT_ANT
10
BT_OSCI
11
BT_OSCO
12
PE7/ADC9
1
VUSB
4
VCMBUF
15
PWRKEY
9
ADC10/MICL/PF2
14
ADC5/PB3
13
PE0
3
DACL
16
U1
AB5357A - SOP16 150mil
PE0
PE7
P3
L+
P4
L-
DACL
DACL#
DACL#
12
BT-ANT1
ANTENNA_PIFA
PE7
PE0
PB3
VDDIO
PB3
+
MIC1
P3
R+
P4
R-
DACL
DACL#