TCA9539PWR

@@ -0,0 +1,68 @@+# TCA9539PWR++**Texas Instruments** · I/O Expanders · TSSOP-24++TCA9539PWR 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 | Interrupt open-drain output. Asserted low whenever an input port pin changes state. Connect to VCC through a pull-up resistor. IOL up to 6 mA (Tj <= 85 C). |+| 2 | A1 | input | I2C hardware address input bit 1. Tie directly to VCC or GND to select one of four I2C addresses. VIH >= 0.7*VCC; VIL <= 0.3*VCC. |+| 3 | RESET | input | Active-low hardware reset input. Drive low to reset device to default register state. Tie to VCC through a pull-up resistor if unused. |+| 4 | P00 | bidirectional | Port 0 GPIO bit 0. Push-pull I/O; configured as input at power-on. Latched high-current drive suitable for driving LEDs directly (IOL up to 25 mA at Tj <= 65 C). |+| 5 | P01 | bidirectional | Port 0 GPIO bit 1. Push-pull I/O; input at power-on. |+| 6 | P02 | bidirectional | Port 0 GPIO bit 2. Push-pull I/O; input at power-on. |+| 7 | P03 | bidirectional | Port 0 GPIO bit 3. Push-pull I/O; input at power-on. |+| 8 | P04 | bidirectional | Port 0 GPIO bit 4. Push-pull I/O; input at power-on. |+| 9 | P05 | bidirectional | Port 0 GPIO bit 5. Push-pull I/O; input at power-on. |+| 10 | P06 | bidirectional | Port 0 GPIO bit 6. Push-pull I/O; input at power-on. |+| 11 | P07 | bidirectional | Port 0 GPIO bit 7. Push-pull I/O; input at power-on. |+| 12 | GND | power_in | Ground reference / device return. |+| 13 | P10 | bidirectional | Port 1 GPIO bit 0. Push-pull I/O; input at power-on. |+| 14 | P11 | bidirectional | Port 1 GPIO bit 1. Push-pull I/O; input at power-on. |+| 15 | P12 | bidirectional | Port 1 GPIO bit 2. Push-pull I/O; input at power-on. |+| 16 | P13 | bidirectional | Port 1 GPIO bit 3. Push-pull I/O; input at power-on. |+| 17 | P14 | bidirectional | Port 1 GPIO bit 4. Push-pull I/O; input at power-on. |+| 18 | P15 | bidirectional | Port 1 GPIO bit 5. Push-pull I/O; input at power-on. |+| 19 | P16 | bidirectional | Port 1 GPIO bit 6. Push-pull I/O; input at power-on. |+| 20 | P17 | bidirectional | Port 1 GPIO bit 7. Push-pull I/O; input at power-on. |+| 21 | A0 | input | I2C hardware address input bit 0. Tie directly to VCC or GND to select I2C address. |+| 22 | SCL | input | I2C/SMBus serial clock input. Requires an external pull-up to VCC. Supports 100 kHz and 400 kHz operation; 5 V tolerant. |+| 23 | SDA | bidirectional | I2C/SMBus serial data line (open-drain). Requires an external pull-up to VCC. IOL up to 6 mA (Tj <= 85 C); 5 V tolerant. |+| 24 | VCC | power_in | Supply voltage input, 1.65 V to 5.5 V. Bypass locally with a decoupling capacitor to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | TSSOP-24 |+| Category | Interface |+| Pins | 24 |++## Ordering variants++- `TCA9539PWRPW`+- `TCA9539PWRPWR`+- `TCA9539PWRRTW`+- `TCA9539PWRRTWR`+- `TCA9539PWRRGE`+- `TCA9539PWRRGER`++## CAD (KiCad official)++- Symbol: `TCA9539PWR`+- 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/tca9539.pdf) (49 pp, sha256 `dbd074d61fa90111`, 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/tca9539pwr-datasheet.pdf)

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