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8-bit I2C expander with interrupt
| Part number | PCF8574 I2C I/O Expander |
|---|---|
| Category | Integrated Circuits › I/O Expander & Bus ICs |
| Package | DIP-16 |
| Pins | 16 |
| Resolution | 8 bit |
PCF8574 I2C I/O Expander pinout
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | A0 | input | |
| 2 | A1 | input | |
| 3 | A2 | input | |
| 4 | P0 | bidirectional | |
| 5 | P1 | bidirectional | |
| 6 | P2 | bidirectional | |
| 7 | P3 | bidirectional | |
| 8 | VSS | ground | |
| 9 | P4 | bidirectional | |
| 10 | P5 | bidirectional | |
| 11 | P6 | bidirectional | |
| 12 | P7 | bidirectional | |
| 13 | ~INT | output | |
| 14 | SCL | input | |
| 15 | SDA | bidirectional | |
| 16 | VDD | power |
Schematic symbol and footprint
Schematic symbol
Footprint: DIP-16 — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.