Digi NS9210 Computer Hardware User Manual


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The I/O expander is a Philips PCA9554D at I
2
C address 0x20 / 0x21. The pins are
allocated as shown:
Pin Signal
1IO_0
2IO_1
3IO_2
4IO_3
5IO_4
6IO_5
7IO_6
8IO_7
9GND
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