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6.3 EXT connectors
At the bottom of the board there are two extension rows of pins. These 2 x 26-pin connectors
combine different processor ports and provide very nice GPIO option – you can interface the
signals exposed with your breadboarding wires; you can use them as headers; you can take signal
readings; etc.
The distance between two pins from the same row is 0.1''. The distance between the two EXT
connectors is exactly 1''.
Refer to sub-chapter 2.3 "EXT pinout (bottom view)" for visual representation of each pin of the
connectors.
6.3.1 EXT1 header
PIN #
STM32H405 PIN
1
PA11
3
PA12
5
3.3V (VDD)
7
PA10
9
PC11 (DISC)
11
PD2
13
PB6
15
PB7
17
PB9
19
PC0
21
PB0
23
VBAT
25
RST
EXT1 HEADER
PIN #
2
4
6
8
10
12
14
16
18
20
22
24
26
Page 19 of 30
STM32-H405 user's manual
STM32H405 PIN
PA8
PA9
GND
PC10
PC12 (LED)
PB5
PA6
PB8
PA5
PC1
PA7
PC13
PB1
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