TCA9534

@@ -0,0 +1,60 @@+# TCA9534++**Texas Instruments** · I2C I/O expander · TSSOP-16++Adds eight general-purpose I/O pins over I2C, each set as input or output through a configuration register. An open-drain INT output flags a change on any input pin, so the host is told which line moved without polling, and three address pins (A0-A2) put up to eight devices on one bus. It runs from 1.65 to 5.5 V, so it bridges different logic domains. A more capable alternative to the PCF8574 with a proper config register and interrupt.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | A0 | input | I2C hardware address input bit 0. Tie directly to VCC or GND to set the device slave address. Allows up to eight TCA9534 devices on the same I2C bus. |+| 2 | A1 | input | I2C hardware address input bit 1. Tie directly to VCC or GND to set the device slave address. |+| 3 | A2 | input | I2C hardware address input bit 2. Tie directly to VCC or GND to set the device slave address. |+| 4 | P0 | bidirectional | P-port I/O bit 0. Push-pull output structure; configured as an input at power-on. IOH max -10 mA, IOL up to 25 mA (Tj <= 65 C). |+| 5 | P1 | bidirectional | P-port I/O bit 1. Push-pull; configured as an input at power-on. |+| 6 | P2 | bidirectional | P-port I/O bit 2. Push-pull; configured as an input at power-on. |+| 7 | P3 | bidirectional | P-port I/O bit 3. Push-pull; configured as an input at power-on. |+| 8 | GND | power_in | Ground reference for the device. |+| 9 | P4 | bidirectional | P-port I/O bit 4. Push-pull; configured as an input at power-on. |+| 10 | P5 | bidirectional | P-port I/O bit 5. Push-pull; configured as an input at power-on. |+| 11 | P6 | bidirectional | P-port I/O bit 6. Push-pull; configured as an input at power-on. |+| 12 | P7 | bidirectional | P-port I/O bit 7. Push-pull; configured as an input at power-on. |+| 13 | INT | output | Active-low open-drain interrupt output. Asserted when an input port changes state; connect to VCC through a pullup resistor. IOL must be externally limited to 7 mA max. |+| 14 | SCL | input | I2C serial clock input. Connect to VCC through a pullup resistor. Supports 100-kHz and 400-kHz operation. |+| 15 | SDA | bidirectional | I2C serial data line, open-drain bidirectional. Connect to VCC through a pullup resistor. IOL up to 8 mA at VOL = 0.5 V. |+| 16 | VCC | power_in | Supply voltage input, 1.65 V to 5.5 V. Bypass locally to GND with a decoupling capacitor. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 8-bit I2C I/O expander |+| Interface | I2C (up to 400 kHz) |+| I/O | 8 pins (P0-P7) |+| Interrupt | INT output (interrupt-on-change) |+| Addresses | 8 (A0-A2) |+| Supply | 1.65-5.5 V |+| Package | TSSOP-16 |++## Ordering variants++- `TCA9534PWR (TSSOP-16)`+- `TCA9534ADWR (SOIC-16, variant address)`+- `TCA9534RGTR (VQFN-16)`++## CAD (KiCad official)++- Symbol: `Interface_Expansion:TCA9534 (KiCad official)`+- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`+- 3D model: TSSOP-16 (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/tca9534.pdf) (42 pp, sha256 `797c1fc96502df7c`, 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/tca9534-datasheet.pdf)

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