TCAL6416RTWR

@@ -0,0 +1,69 @@+# TCAL6416RTWR++**Texas Instruments** · I/O Expanders · WQFN-24(4x4)++TCAL6416RTWR from Texas Instruments, in a WQFN-24(4x4). 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 | P00 | bidirectional | P-port 0 input/output (push-pull design structure). At power-on, P00 is configured as an input. |+| 2 | P01 | bidirectional | P-port 1 input/output (push-pull). At power-on, P01 is configured as an input. |+| 3 | P02 | bidirectional | P-port 2 input/output (push-pull). At power-on, P02 is configured as an input. |+| 4 | P03 | bidirectional | P-port 3 input/output (push-pull). At power-on, P03 is configured as an input. |+| 5 | P04 | bidirectional | P-port 4 input/output (push-pull). At power-on, P04 is configured as an input. |+| 6 | P05 | bidirectional | P-port 5 input/output (push-pull). At power-on, P05 is configured as an input. |+| 7 | P06 | bidirectional | P-port 6 input/output (push-pull). At power-on, P06 is configured as an input. |+| 8 | P07 | bidirectional | P-port 7 input/output (push-pull). At power-on, P07 is configured as an input. |+| 9 | GND | power_in | Device ground. |+| 10 | P10 | bidirectional | P-port 10 input/output (push-pull). At power-on, P10 is configured as an input. |+| 11 | P11 | bidirectional | P-port 11 input/output (push-pull). At power-on, P11 is configured as an input. |+| 12 | P12 | bidirectional | P-port 12 input/output (push-pull). At power-on, P12 is configured as an input. |+| 13 | P13 | bidirectional | P-port 13 input/output (push-pull). At power-on, P13 is configured as an input. |+| 14 | P14 | bidirectional | P-port 14 input/output (push-pull). At power-on, P14 is configured as an input. |+| 15 | P15 | bidirectional | P-port 15 input/output (push-pull). At power-on, P15 is configured as an input. |+| 16 | P16 | bidirectional | P-port 16 input/output (push-pull). At power-on, P16 is configured as an input. |+| 17 | P17 | bidirectional | P-port 17 input/output (push-pull). At power-on, P17 is configured as an input. |+| 18 | ADDR | input | I2C address-select input. Tie directly to VCCP or GND to select one of two possible I2C slave addresses; allows two TCAL6416 devices on the same bus. |+| 19 | SCL | input | I2C serial clock input. Connect to VCCI through a pull-up resistor. Supports 100 kHz standard, 400 kHz fast, and 1 MHz fast-mode-plus. |+| 20 | SDA | bidirectional | I2C serial data (open-drain, bidirectional). Connect to VCCI through a pull-up resistor. |+| 21 | VCCP | power_in | Supply voltage for the P-port side (P00-P17). Operating range 1.08 V to 3.6 V; enables voltage-level translation independent of VCCI. |+| 22 | INT | output | Active-low open-drain interrupt output. Connect to VCCI or VCCP through a pull-up resistor. Asserts when any input P-port changes state (subject to interrupt mask register). |+| 23 | VCCI | power_in | Supply voltage for the I2C-bus side. Connect directly to the supply voltage of the external I2C controller. Operating range 1.08 V to 3.6 V. |+| 24 | RESET | input | Active-low reset input. Connect to VCCI through a pull-up resistor if no active connection is used. Forces all registers to their default (power-on) state when driven low. |+| 25 | EP | passive | Exposed thermal/center pad on the WQFN underside. Must be connected as a secondary ground or left electrically open (per Figure 5-2 note). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | WQFN-24(4x4) |+| Category | Comm/UART |+| Pins | 25 |++## Ordering variants++Same part, different packaging or reel option.++- `TCAL6416RTWR`+- `TCAL6416RTWRRTWT`+- `TCAL6416RTWRPW`+- `TCAL6416RTWRPWR`++## CAD (KiCad official)++- Symbol: `TCAL6416RTWR`+- Footprint: `Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm`+- 3D model: WQFN-24(4x4) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](docs/tcal6416rtwr-datasheet.pdf) (53 pp, sha256 `741d66f5bb7613d2`, retrieved 2026-08-17, tier: lcsc)+- **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/tcal6416rtwr-datasheet.pdf)

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