International Computer Hardware User Manual
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NS9210
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51
The I/O
expander
is a P
hilips PCA9554D at I
2
C address 0x20 / 0
x21. The pins are
allocated as shown:
Pin
Signal
1I
O
_
0
2I
O
_
1
3I
O
_
2
4I
O
_
3
5I
O
_
4
6I
O
_
5
7I
O
_
6
8I
O
_
7
9G
N
D
1
...
...
49
50
51
52
53
...
...
80
