Schematics

5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
VBAT
+5V
3.3V
DACL/R+
DACL/R-
MIC
VBAT
AGND
+5V
AGND
+5V
3.3V
S2
FF
TX
TX
Y1
26MHz
L+
R-
IC1 AB5357H
8 9
10
5
7
6
1
2
3
4
16
15
14
13
12
11
VDDBT PW RKEY
BT_ANT
VDDIO
DGND
VBAT
PE7/ADC9
AGND
PE0
VUSB
DACL
DACR
ADC10/MICL/PF2
ADC5/PB3
BT_OSCO
BT_OSCI
L-
C8 105
M
J2
USB2.0
6 7 8
9
5
4
3
2
1
6 7 8
9
R+
D4 RED_LED
B+
B-
12
D2 B-LED
K
C10 NC
B+
S3
FB
C11 NC
C1 0R
MIC J1
1
2
S1
POWER
B-