Schematics

IC-AC6969
C
5
1
0
5
1
CHG
2
GND
3
BAT
4
VCC
5
PROG
U2
R
2
3
.
6
K
1 2
LED3
RED
R3
1K
1
VCC
2
D-
3
D+
4
ID
5
GND
1
0
1
1
6 7
1
4
USB1
1
X1
R9
NC
C10
8.2K
C
9
1
0
6
C8
105
R6
100K
1
X3
1
X4
R10
56K
C11
223
1
SD
2
BYP
3
MODE
4
INN
5
VON
6
V
C
C
7
G
N
D
8
VOP
9
PG
U3
HAA2018A
1
LDO_IN/PB5
2
VBAT
3
VDDIO
4
PB1/ADC5
5
FMIP
6
BT_RF
7
BT_OSCI
8
BT_OSCO
9
ADC12/SD0CLK/PC5
10
ADC11/SD0CMD/PC4
11
ADC14/SD0DAT/PC3/USBDM
12
ADC3/PA4/USBDP
13
PA1/PA0
14
VSSIO
15
VCOM
16
DACL
U1
AC6969D
Y1
24MHZ
C7
105
C4
105
C3
105
1
X2
1
2
1 2
LED4
BLUE
C
1
1
0
5
C
6
1
0
5
1
B
2
E
3
C
Q2
8550
1
G
2
S 3D
Q1
3401
R7
1K
R8
10K
R5
10K
1
X5
R11
47R
R1
0R
1
A
2
B
3
C
4
G
N
D
5
G
N
D
SW1
R4
0R
BAT
MUTE
VMCU
VMCU
DACL
BT_OSCI
BT_OSCO
BT_OSCI BT_OSCO
3.3V
VMCU
DACL
MUTE
LED
LED
VMCU
BAT
5V
4054