Schematics

1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
D D
C C
B B
A A
R23
0.5R
L2
1UH
C22
226
BAT
D4
50%
D3
25%
D5
75%
D6
100%
R25
10K
VIN
1
SCK
2
SDA
3
INT
4
K
5
BAT
6
SW
7
VOUT
8
GND
0
U4
5306
C23
226
C26
106
C25
106
C24
226
R22
2R
C20
106
C21
106
K1
USB5V
USB5V
1
DN/D-
2
DP/D+
3
GND
4
GND
5
J2
USB_B
B
EC
Q1
3401
R26
1M
R27
2M
IN5V
+5V
A1
A4
A5
A6
A7
A9
A12 B1
B4
B5
B6
B7
B9
B12
USB_C1
USB_Femal
GND GND
GND GND
R20
5.1K
R21
5.1K
IN5V
IN5V
IN5V
IN5V
GND
X7R 104 50VC12
X7R 104 50V
C13
X7R 104 50V
C14
X7R 104 50V
C16
L1
1K
R13
2R
R2
0.03R
R14
106
C2
NC
R9
NC
R8
473C15
B
LED1
R
LED2
1K
R1
106
C1
106
C7
NC
R10
NC D1
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9926
U3
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
4953U2
IN4148
D2
1K
R15
200K
R12
103
C5
103
C3
100K
R11
103
C4
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16
YM-718A
U1
NC
C10
NC
C8
NC
C9
NC
R5
NC
R3
NC
C11
10K
R6
10K
R7
NC
R4
1K
R16
TP3
TP4
TP5
TP6
TP7
EMC
C17
10K
R18
NC
C18
VCC
VCC
VCC
UP
UP
PWM2
PWM1
PDA
PDA
PCL
PCL
PCL
CUR
DOWN
DOWN
NTC
VPP
VPP
LED-B
LED-R
GND
GND
GND
VCC
GNDGNDGND
GND
GND
GND GND
GND
VCC
GND
PCL
PDA
VPP
GND
PDA
GND
GND
GND
GND
PCL
PCL
VCC
+5V
CBB 334 100V
C30
R28
470R
C27
104
1
J1
BAT+
1
J3
BAT-
BAT+
GND
4
VM
1
BAT-
3
GND
5
BAT-
2
U5
7608