Reference: http://www.ti.com/lit/ml/scyb031/scyb031.pdf
A 2 | A 1 | A 0 | PCF8574 | PCF8574A |
L | L | L | 20 (hexadecimal) | 38 (hexadecimal) |
L | L | H | 21 (hexadecimal) | 39 (hexadecimal) |
L | H | L | 22 (hexadecimal) | 3A (hexadecimal) |
L | H | H | 23 (hexadecimal) | 3B (hexadecimal) |
H | L | L | 24 (hexadecimal) | 3C (hexadecimal) |
H | L | H | 25 (hexadecimal) | 3D (hexadecimal) |
H | H | L | 26 (hexadecimal) | 3E (hexadecimal) |
H | H | H | 27 (hexadecimal) | 3F (hexadecimal) |
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