Schematic

1
2
3
4
1
2
3
4
GND
1*9
VCC
17
RST
18
INT
19
SDA
9
SCL
12
TX
13
RX
14
SAFEBOOT
8
TPULSE
7
V_BCKP
3
VCC_IO
2
1
2
3
4
5
6
1
2
3
4
5
6
7
8
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