PCF8575 16-Bit I2C I/O Expander

@@ -0,0 +1,78 @@+# PCF8575++**Texas Instruments** · I/O Expander · SSOP-24++The PCF8575 is a 16-bit quasi-bidirectional I/O expander controlled over I2C. Its two 8-bit ports act as inputs or open-drain outputs with weak pull-ups, and an interrupt output flags a change on any input. Three hardware address pins let up to eight devices share a bus. It is the 16-bit sibling of the 8-bit PCF8574.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | INT | output | Interrupt output (active-low, open-drain). Connect to VCC through a pull-up resistor. Asserts when any P-port input changes state. |+| 2 | A1 | input | I2C hardware address input 1. Connect directly to VCC or ground; pull-up resistors are not needed. Combined with A0/A2 to give up to eight unique bus addresses. |+| 3 | A2 | input | I2C hardware address input 2. Connect directly to VCC or ground; pull-up resistors are not needed. |+| 4 | P00 | bidirectional | P-port 0, bit 0. Quasi-bidirectional I/O with push-pull design structure; latched outputs with high-current drive for LEDs. IOL up to 25 mA, IOH transient pullup ~-10 mA. |+| 5 | P01 | bidirectional | P-port 0, bit 1. Quasi-bidirectional I/O with push-pull design structure. |+| 6 | P02 | bidirectional | P-port 0, bit 2. Quasi-bidirectional I/O with push-pull design structure. |+| 7 | P03 | bidirectional | P-port 0, bit 3. Quasi-bidirectional I/O with push-pull design structure. |+| 8 | P04 | bidirectional | P-port 0, bit 4. Quasi-bidirectional I/O with push-pull design structure. |+| 9 | P05 | bidirectional | P-port 0, bit 5. Quasi-bidirectional I/O with push-pull design structure. |+| 10 | P06 | bidirectional | P-port 0, bit 6. Quasi-bidirectional I/O with push-pull design structure. |+| 11 | P07 | bidirectional | P-port 0, bit 7. Quasi-bidirectional I/O with push-pull design structure. |+| 12 | GND | power_in | Ground reference for the device. |+| 13 | P10 | bidirectional | P-port 1, bit 0. Quasi-bidirectional I/O with push-pull design structure. |+| 14 | P11 | bidirectional | P-port 1, bit 1. Quasi-bidirectional I/O with push-pull design structure. |+| 15 | P12 | bidirectional | P-port 1, bit 2. Quasi-bidirectional I/O with push-pull design structure. |+| 16 | P13 | bidirectional | P-port 1, bit 3. Quasi-bidirectional I/O with push-pull design structure. |+| 17 | P14 | bidirectional | P-port 1, bit 4. Quasi-bidirectional I/O with push-pull design structure. |+| 18 | P15 | bidirectional | P-port 1, bit 5. Quasi-bidirectional I/O with push-pull design structure. |+| 19 | P16 | bidirectional | P-port 1, bit 6. Quasi-bidirectional I/O with push-pull design structure. |+| 20 | P17 | bidirectional | P-port 1, bit 7. Quasi-bidirectional I/O with push-pull design structure. |+| 21 | A0 | input | I2C hardware address input 0. Connect directly to VCC or ground; pull-up resistors are not needed. |+| 22 | SCL | input | I2C serial clock line. Connect to VCC through a pull-up resistor. Supports up to 400 kHz (Fast-mode I2C). |+| 23 | SDA | bidirectional | I2C serial data line (open-drain). Connect to VCC through a pull-up resistor. |+| 24 | VCC | power_in | Supply voltage input. Recommended operating range 2.5 V to 5.5 V (absolute max 6.5 V). Bypass with a decoupling capacitor to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 16-bit I2C I/O expander |+| I/O | 16, quasi-bidirectional (2 ports) |+| Interface | I2C (up to 400 kHz) |+| Interrupt | Open-drain, on input change |+| Addressing | 3 hardware address pins (up to 8) |+| Supply voltage | 2.5 V to 5.5 V |+| Operating temperature | -40 C to 85 C |++## Ordering variants++- `PCF8575DB`+- `PCF8575DBR`+- `PCF8575DBQ`+- `PCF8575DBQR`+- `PCF8575DGV`+- `PCF8575DGVR`+- `PCF8575DW`+- `PCF8575DWR`+- `PCF8575PW`+- `PCF8575PWR`+- `PCF8575RGE`+- `PCF8575RGER`+- `PCF8575RGET`++## CAD (KiCad official)++- Symbol: `pcf8575.kicad_sym`+- Footprint: `pcf8575.kicad_mod`+- 3D model: SSOP-24 body from KiCad `Package_SO/SSOP-24_3.9x8.7mm_P0.635mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/pcf8575.pdf) (44 pp, sha256 `c9a02501bf10ed80`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/pcf8575-datasheet.pdf)

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