PCA9555PWR

@@ -0,0 +1,73 @@+# PCA9555PWR++**Texas Instruments** · I/O Expanders · TSSOP-24++PCA9555PWR from Texas Instruments, in a TSSOP-24. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | INT | output | Active-low, open-drain interrupt output. Asserted on any input-port state change; connect to VCC through a pull-up resistor. |+| 2 | A1 | input | I2C hardware address input bit 1. Tie directly to VCC or GND to set the device's I2C slave address. |+| 3 | A2 | input | I2C hardware address input bit 2. Tie directly to VCC or GND to set the device's I2C slave address. |+| 4 | P00 | bidirectional | Port 0 bit 0, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 5 | P01 | bidirectional | Port 0 bit 1, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 6 | P02 | bidirectional | Port 0 bit 2, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 7 | P03 | bidirectional | Port 0 bit 3, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 8 | P04 | bidirectional | Port 0 bit 4, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 9 | P05 | bidirectional | Port 0 bit 5, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 10 | P06 | bidirectional | Port 0 bit 6, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 11 | P07 | bidirectional | Port 0 bit 7, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 12 | GND | power_in | Device ground return. |+| 13 | P10 | bidirectional | Port 1 bit 0, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 14 | P11 | bidirectional | Port 1 bit 1, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 15 | P12 | bidirectional | Port 1 bit 2, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 16 | P13 | bidirectional | Port 1 bit 3, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 17 | P14 | bidirectional | Port 1 bit 4, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 18 | P15 | bidirectional | Port 1 bit 5, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 19 | P16 | bidirectional | Port 1 bit 6, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 20 | P17 | bidirectional | Port 1 bit 7, push-pull general-purpose I/O. IOL = 25 mA max sink, IOH = -10 mA max source. Defaults to input at power-on. |+| 21 | A0 | input | I2C hardware address input bit 0. Tie directly to VCC or GND to set the device's I2C slave address. |+| 22 | SCL | input | I2C serial clock (400 kHz Fast-mode). Open-drain bus line; connect to VCC through a pull-up resistor. |+| 23 | SDA | bidirectional | I2C serial data (400 kHz Fast-mode). Open-drain bus line; connect to VCC through a pull-up resistor. |+| 24 | VCC | power_in | Supply voltage, 2.3 V to 5.5 V. Decouple to GND with a local bypass capacitor. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | TSSOP-24 |+| Category | Comm/UART |+| Pins | 24 |++## Ordering variants++- `PCA9555PWR`+- `PCA9555PWRDB`+- `PCA9555PWRDBR`+- `PCA9555PWRDBQ`+- `PCA9555PWRDBQR`+- `PCA9555PWRDGV`+- `PCA9555PWRDGVR`+- `PCA9555PWRDW`+- `PCA9555PWRDWR`+- `PCA9555PWRRGE`+- `PCA9555PWRRGER`++## CAD (KiCad official)++- Symbol: `PCA9555PWR`+- Footprint: `Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm`+- 3D model: TSSOP-24 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/pca9555.pdf) (49 pp, sha256 `9b5cc24c3c9e286a`, 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/pca9555pwr-datasheet.pdf)

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