I2C expander chip
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Datasheet is here: Media:PCF8574.pdf
| Pin # | Name |
| 1 | Soft Reset A |
| 2 | Soft Reset B |
| 3 | Soft Reset C |
| 4 | Soft Reset D |
| 5 | Soft Reset E |
| 6 | Soft Reset F |
| 7 | I2C traffic |
| 8 | Clear upset regs |