Schematics
1 2 3 4
A
B
C
D
4
321
D
C
B
A
Title
Number RevisionSize
A4
Date: 4-Jan-2021 Sheet of
File: Drawn By:
+5V
1
D-
2
D+
3
GND
4
GND
5
6
79
8
J4
MICRO_USB
C5
NC
R23
1R
C6
105
C25
106
1
2
SP1
P2.0*2P
R18 10KC22
105
R25
47K
12
ANT1
ANTENNA_PIFA
1
1
3
3
2
4
Y1
R15
0R
C12
105
R27
1K
R28
47K
1
2
Y2
NC
3 4
21
K1
6*6*5.5H
PB7/ADC9
1
LDOION/PB5
2
VBAT
3
VDDIO
4
PB1/ADC5
5
PB0
6
BT_RF
7
VSSIO
8
BT_OSCI
9
BT_OSCO
10
ADC14/DM
11
ADC3/ADC13/PA4/DP
12
ADC1/MIC/PA1
13
DACVSS
14
VCOM
15
DACL
16
U2
AC6969E
MUTE
C3
105
VDDIO
VMCU
C4
105
DC5V
LED
VBAT
SD
1
BYP
2
IN+
3
IN-
4
VO1
5
VDD
6
GND
7
VO2
8
U1
HAA2018A
VMCU
MUTE
VMCU
VBAT
24M/3225-JF
DC5V
DM
DP
DP
DM
BLUE
C10
105
VCOM
D4
LED
D5
BLUE