Schematics

ANT
MIC
LED
KEY
RC
12
3 4
Y1
TXC_26M
L2
D2
RED
C6
475
1
+
2
_
MIC1
T1 T2 T3 T4
D1
BLUE
C5
225
L3
NC
1
VDDIO
2
BAT
3
LX
4
GND
5
VDDBT
6
PWKEY
7
BT-RF
8
GND
9
VDDBT
10
OSCI
11
OSCO
12
LED
13
MICIN
14
DACR
15
DACL
16
+5V
U1
AB5377D
R3330R
L1
10uH
1
2
3
4
K1
KEY_4
C4
105
C3
225
R1 3.3K
C2
33pF
C1
33pF
T5 T6 T7
R2 0R
ANT
VDDIO
MICIN
VBAT
DACL
VBAT
XO
XI
XI
XO
VDDIO
DACR
VDDIO
VBAT
VDDBT
VDDBT
PWKEY
ANT
VDDBT
VDDBT
VDDBT
LED
LED
DACR DACL
MICIN
DACR
DACL
+5V
+5V
LED
PWKEY